Re: [Wicket-user] NPE in Page#componentStateChanging
this is very strange because as far as i know that flag is only set inside
that if:
if (!getFlag(FLAG_NEW_VERSION)) -- this may return false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion
(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
But i guess versionManager is in some places set to null gain.. Is then that
flag not reset?
johan
On 3/5/07, Aaron Hiniker [EMAIL PROTECTED] wrote:
I ran this through my debugger, and my assumptions where correct. The
FLAG_NEW_VERSION flag is set while versionManager is null. I'm, looking
around and can't figure out the exact conditions that would cause this.
Any thoughts?
Aaron
Aaron Hiniker wrote:
Yeah, I know. But I'm not messing with any versioning settings (this is
just out-of-the-box ajax components and the like), so really there shouldn't
be any of these issues, correct? Here's mayTrackChangesFor() method, I've
added a comment regarding my thoughts as to what is causing this:
private final boolean mayTrackChangesFor(final Component component,
MarkupContainer parent)
{
// Auto components do not participate in versioning since they are
// added during the rendering phase (which is normally illegal).
if (component.isAuto() || (parent == null
!component.isVersioned())
|| (parent != null !parent.isVersioned()))
{
return false;
}
else
{
// the component is versioned... are we tracking changes at
all?
if (getFlag(FLAG_TRACK_CHANGES)) -- this returns true
{
// we are tracking changes... do we need to start new
version?
if (!getFlag(FLAG_NEW_VERSION)) -- this may return
false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion
(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
// this returns true, even though versionManager is not
set because of false check above
// return true as we are ready for versioning
return true;
}
// we are not tracking changes or the component not versioned
return false;
}
}
Should I specifically be setting versioning/non-versioning for components
to avoid this error?
Aaron
Johan Compagner wrote:
But if it is null then you could have a problem that things should be
versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, Aaron HIniker [EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I looked at the
method and I can't see a loophole, but there must be one to generate an NPE,
correct?
When I implemented the not-null check, I noticed exceptions still being
thrown from 2 other methods (if you search Page.java for versionManager,
you can see where there is the assumption that mayTrackChangesFor() is
checked for 'true', yet versionManager is never initialized in other methods
as well. So after adding the null check to each of these methods, the
application is working fine. Thing is, I've only seen this exception when
dealing with ajax (default not versioned, right?).
I will try and run a debugger through mayTrackChangesFor() with my
current app, and see the logic flow and why versionManager is ending up
null.
Aaron
Johan Compagner wrote:
That is because the mayTrackChangesFor() method should only return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null because
the version info must be tracked.
johan
On 3/1/07, Aaron Hiniker [EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java :596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(
ProductSearchPanel.java:144)
Re: [Wicket-user] NPE in Page#componentStateChanging
Line #601 in Page.java is the only place where versionManager gets set
back to null from what I can tell..
// If we went all the way back to the
original page
if (page != null
page.getCurrentVersionNumber() == 0)
{
// remove version info
page.versionManager = null;
}
I am using bookmarkable pages, without an immediate redirect to a Page
instance, do bookmarkable pages stay on version 0 when invoking an ajax
component?
Or should this be set to a new instance of VersionManager instead of null?
Aaron
Johan Compagner wrote:
this is very strange because as far as i know that flag is only set
inside that if:
if (!getFlag(FLAG_NEW_VERSION)) -- this may return false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
But i guess versionManager is in some places set to null gain.. Is
then that flag not reset?
johan
On 3/5/07, *Aaron Hiniker * [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
I ran this through my debugger, and my assumptions where correct.
The FLAG_NEW_VERSION flag is set while versionManager is null.
I'm, looking around and can't figure out the exact conditions that
would cause this.
Any thoughts?
Aaron
Aaron Hiniker wrote:
Yeah, I know. But I'm not messing with any versioning settings
(this is just out-of-the-box ajax components and the like), so
really there shouldn't be any of these issues, correct? Here's
mayTrackChangesFor() method, I've added a comment regarding my
thoughts as to what is causing this:
private final boolean mayTrackChangesFor(final Component
component, MarkupContainer parent)
{
// Auto components do not participate in versioning since
they are
// added during the rendering phase (which is normally
illegal).
if (component.isAuto() || (parent == null
!component.isVersioned())
|| (parent != null !parent.isVersioned()))
{
return false;
}
else
{
// the component is versioned... are we tracking
changes at all?
if (getFlag(FLAG_TRACK_CHANGES)) -- this returns true
{
// we are tracking changes... do we need to start
new version?
if (!getFlag(FLAG_NEW_VERSION)) -- this may
return false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
// this returns true, even though versionManager
is not set because of false check above
// return true as we are ready for versioning
return true;
}
// we are not tracking changes or the component not
versioned
return false;
}
}
Should I specifically be setting versioning/non-versioning for
components to avoid this error?
Aaron
Johan Compagner wrote:
But if it is null then you could have a problem that things
should be versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, * Aaron HIniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I
looked at the method and I can't see a loophole, but there
must be one to generate an NPE, correct?
When I implemented the not-null check, I noticed exceptions
still being thrown from 2 other methods (if you search
Page.java for versionManager, you can see where there is the
assumption that mayTrackChangesFor() is checked for 'true',
yet versionManager is never initialized in other methods as
well. So after adding the null check to each of these
methods, the application
Re: [Wicket-user] NPE in Page#componentStateChanging
normally ajax shouldn't make a new version but in 1.3 we have also an ajax
version number beside the page version number.
But that the moment page.versionManager is set to null the flag should be
false at that time.
But if you have a quick test that exposes this null pointer please make an
issue and attach it.
On 3/7/07, Aaron HIniker [EMAIL PROTECTED] wrote:
Line #601 in Page.java is the only place where versionManager gets set
back to null from what I can tell..
// If we went all the way back to the
original page
if (page != null
page.getCurrentVersionNumber() == 0)
{
// remove version info
page.versionManager = null;
}
I am using bookmarkable pages, without an immediate redirect to a Page
instance, do bookmarkable pages stay on version 0 when invoking an ajax
component?
Or should this be set to a new instance of VersionManager instead of null?
Aaron
Johan Compagner wrote:
this is very strange because as far as i know that flag is only set inside
that if:
if (!getFlag(FLAG_NEW_VERSION)) -- this may return false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion
(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
But i guess versionManager is in some places set to null gain.. Is then
that flag not reset?
johan
On 3/5/07, Aaron Hiniker [EMAIL PROTECTED] wrote:
I ran this through my debugger, and my assumptions where correct. The
FLAG_NEW_VERSION flag is set while versionManager is null. I'm, looking
around and can't figure out the exact conditions that would cause this.
Any thoughts?
Aaron
Aaron Hiniker wrote:
Yeah, I know. But I'm not messing with any versioning settings (this
is just out-of-the-box ajax components and the like), so really there
shouldn't be any of these issues, correct? Here's mayTrackChangesFor()
method, I've added a comment regarding my thoughts as to what is causing
this:
private final boolean mayTrackChangesFor(final Component component,
MarkupContainer parent)
{
// Auto components do not participate in versioning since they
are
// added during the rendering phase (which is normally illegal).
if (component.isAuto() || (parent == null
!component.isVersioned())
|| (parent != null !parent.isVersioned()))
{
return false;
}
else
{
// the component is versioned... are we tracking changes at
all?
if (getFlag(FLAG_TRACK_CHANGES)) -- this returns true
{
// we are tracking changes... do we need to start new
version?
if (!getFlag(FLAG_NEW_VERSION)) -- this may return
false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion
(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
// this returns true, even though versionManager is not
set because of false check above
// return true as we are ready for versioning
return true;
}
// we are not tracking changes or the component not
versioned
return false;
}
}
Should I specifically be setting versioning/non-versioning for
components to avoid this error?
Aaron
Johan Compagner wrote:
But if it is null then you could have a problem that things should be
versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, Aaron HIniker [EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I looked at the
method and I can't see a loophole, but there must be one to generate an NPE,
correct?
When I implemented the not-null check, I noticed exceptions still
being thrown from 2 other methods (if you search Page.java for
versionManager, you can see where there is the assumption that
mayTrackChangesFor() is checked for 'true', yet versionManager is never
initialized in other methods as well. So after adding the null check to
each of these methods, the application is working fine. Thing is, I've only
Re: [Wicket-user] NPE in Page#componentStateChanging
I've experienced the exact same problem. You'll get this a lot when working
with ajax components. I've also reported this issue to the wicket 2 jira. If
you add if(versionManger != null) prior to the versionManager call you'll be
fine but that's probably an ugly hack. But it seem to work til they've
actually fixed it.
Aaron Hiniker-2 wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java:596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate(ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit(QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I remember I was getting this NPE before, and I patched the source to
include this null check in Page.java:
final void componentStateChanging(final Component component,
Change change)
{
checkHierarchyChange(component);
dirty();
if (mayTrackChangesFor(component, null))
{
if ( versionManager != null )
versionManager.componentStateChanging(change);
}
}
It seems that everywhere else in Page.java there is a null check for
versionManager, except in this method. Not sure, but perhaps the
problem lies in the #mayTrackChangesFor() method, but in any case if I
add this null check my code runs fine.
Aaron
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Re: [Wicket-user] NPE in Page#componentStateChanging
Yeah, I know. But I'm not messing with any versioning settings (this is
just out-of-the-box ajax components and the like), so really there
shouldn't be any of these issues, correct? Here's mayTrackChangesFor()
method, I've added a comment regarding my thoughts as to what is causing
this:
private final boolean mayTrackChangesFor(final Component component,
MarkupContainer parent)
{
// Auto components do not participate in versioning since they are
// added during the rendering phase (which is normally illegal).
if (component.isAuto() || (parent == null
!component.isVersioned())
|| (parent != null !parent.isVersioned()))
{
return false;
}
else
{
// the component is versioned... are we tracking changes at all?
if (getFlag(FLAG_TRACK_CHANGES)) -- this returns true
{
// we are tracking changes... do we need to start new
version?
if (!getFlag(FLAG_NEW_VERSION)) -- this may return false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
// this returns true, even though versionManager is not
set because of false check above
// return true as we are ready for versioning
return true;
}
// we are not tracking changes or the component not versioned
return false;
}
}
Should I specifically be setting versioning/non-versioning for
components to avoid this error?
Aaron
Johan Compagner wrote:
But if it is null then you could have a problem that things should be
versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, * Aaron HIniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I looked at
the method and I can't see a loophole, but there must be one to
generate an NPE, correct?
When I implemented the not-null check, I noticed exceptions still
being thrown from 2 other methods (if you search Page.java for
versionManager, you can see where there is the assumption that
mayTrackChangesFor() is checked for 'true', yet versionManager is
never initialized in other methods as well. So after adding the
null check to each of these methods, the application is working
fine. Thing is, I've only seen this exception when dealing with
ajax (default not versioned, right?).
I will try and run a debugger through mayTrackChangesFor() with my
current app, and see the logic flow and why versionManager is
ending up null.
Aaron
Johan Compagner wrote:
That is because the mayTrackChangesFor() method should only
return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null
because the version info must be tracked.
johan
On 3/1/07, *Aaron Hiniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java :596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate
(ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit
(QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
Re: [Wicket-user] NPE in Page#componentStateChanging
I ran this through my debugger, and my assumptions where correct. The
FLAG_NEW_VERSION flag is set while versionManager is null. I'm, looking
around and can't figure out the exact conditions that would cause this.
Any thoughts?
Aaron
Aaron Hiniker wrote:
Yeah, I know. But I'm not messing with any versioning settings (this
is just out-of-the-box ajax components and the like), so really there
shouldn't be any of these issues, correct? Here's
mayTrackChangesFor() method, I've added a comment regarding my
thoughts as to what is causing this:
private final boolean mayTrackChangesFor(final Component
component, MarkupContainer parent)
{
// Auto components do not participate in versioning since they are
// added during the rendering phase (which is normally illegal).
if (component.isAuto() || (parent == null
!component.isVersioned())
|| (parent != null !parent.isVersioned()))
{
return false;
}
else
{
// the component is versioned... are we tracking changes
at all?
if (getFlag(FLAG_TRACK_CHANGES)) -- this returns true
{
// we are tracking changes... do we need to start new
version?
if (!getFlag(FLAG_NEW_VERSION)) -- this may return
false?
{
// if we have no version manager
if (versionManager == null)
{
// then install a new version manager
versionManager = newVersionManager();
}
// start a new version
versionManager.beginVersion(getRequest().mergeVersion());
setFlag(FLAG_NEW_VERSION, true);
}
// this returns true, even though versionManager is
not set because of false check above
// return true as we are ready for versioning
return true;
}
// we are not tracking changes or the component not versioned
return false;
}
}
Should I specifically be setting versioning/non-versioning for
components to avoid this error?
Aaron
Johan Compagner wrote:
But if it is null then you could have a problem that things should be
versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, * Aaron HIniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I looked at
the method and I can't see a loophole, but there must be one to
generate an NPE, correct?
When I implemented the not-null check, I noticed exceptions still
being thrown from 2 other methods (if you search Page.java for
versionManager, you can see where there is the assumption that
mayTrackChangesFor() is checked for 'true', yet versionManager is
never initialized in other methods as well. So after adding the
null check to each of these methods, the application is working
fine. Thing is, I've only seen this exception when dealing with
ajax (default not versioned, right?).
I will try and run a debugger through mayTrackChangesFor() with
my current app, and see the logic flow and why versionManager is
ending up null.
Aaron
Johan Compagner wrote:
That is because the mayTrackChangesFor() method should only
return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null
because the version info must be tracked.
johan
On 3/1/07, *Aaron Hiniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java :596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate
(ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit
(QueryPanel.java:197)
16:30:14,547 ERROR [STDERR]
Re: [Wicket-user] NPE in Page#componentStateChanging
But if it is null then you could have a problem that things should be
versioned but arent..
So adding null checks is not the fix.
johan
On 3/2/07, Aaron HIniker [EMAIL PROTECTED] wrote:
That's why I was pointing at mayTrackChangesFor().. I looked at the
method and I can't see a loophole, but there must be one to generate an NPE,
correct?
When I implemented the not-null check, I noticed exceptions still being
thrown from 2 other methods (if you search Page.java for versionManager,
you can see where there is the assumption that mayTrackChangesFor() is
checked for 'true', yet versionManager is never initialized in other methods
as well. So after adding the null check to each of these methods, the
application is working fine. Thing is, I've only seen this exception when
dealing with ajax (default not versioned, right?).
I will try and run a debugger through mayTrackChangesFor() with my current
app, and see the logic flow and why versionManager is ending up null.
Aaron
Johan Compagner wrote:
That is because the mayTrackChangesFor() method should only return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null because the
version info must be tracked.
johan
On 3/1/07, Aaron Hiniker [EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java :596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(
ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate (
ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(
FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit(
QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I remember I was getting this NPE before, and I patched the source to
include this null check in Page.java :
final void componentStateChanging(final Component component,
Change change)
{
checkHierarchyChange(component);
dirty();
if (mayTrackChangesFor(component, null))
{
if ( versionManager != null )
versionManager.componentStateChanging(change);
}
}
It seems that everywhere else in Page.java there is a null check for
versionManager, except in this method. Not sure, but perhaps the
problem lies in the #mayTrackChangesFor() method, but in any case if I
add this null check my code runs fine.
Aaron
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Re: [Wicket-user] NPE in Page#componentStateChanging
That's why I was pointing at mayTrackChangesFor().. I looked at the
method and I can't see a loophole, but there must be one to generate an
NPE, correct?
When I implemented the not-null check, I noticed exceptions still being
thrown from 2 other methods (if you search Page.java for versionManager,
you can see where there is the assumption that mayTrackChangesFor() is
checked for 'true', yet versionManager is never initialized in other
methods as well. So after adding the null check to each of these
methods, the application is working fine. Thing is, I've only seen this
exception when dealing with ajax (default not versioned, right?).
I will try and run a debugger through mayTrackChangesFor() with my
current app, and see the logic flow and why versionManager is ending up
null.
Aaron
Johan Compagner wrote:
That is because the mayTrackChangesFor() method should only return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null because
the version info must be tracked.
johan
On 3/1/07, *Aaron Hiniker* [EMAIL PROTECTED]
mailto:[EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java :596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate
(ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit
(QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I remember I was getting this NPE before, and I patched the source to
include this null check in Page.java :
final void componentStateChanging(final Component component,
Change change)
{
checkHierarchyChange(component);
dirty();
if (mayTrackChangesFor(component, null))
{
if ( versionManager != null )
versionManager.componentStateChanging(change);
}
}
It seems that everywhere else in Page.java there is a null check for
versionManager, except in this method. Not sure, but perhaps the
problem lies in the #mayTrackChangesFor() method, but in any case if I
add this null check my code runs fine.
Aaron
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[Wicket-user] NPE in Page#componentStateChanging
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java:596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate(ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit(QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I remember I was getting this NPE before, and I patched the source to
include this null check in Page.java:
final void componentStateChanging(final Component component,
Change change)
{
checkHierarchyChange(component);
dirty();
if (mayTrackChangesFor(component, null))
{
if ( versionManager != null )
versionManager.componentStateChanging(change);
}
}
It seems that everywhere else in Page.java there is a null check for
versionManager, except in this method. Not sure, but perhaps the
problem lies in the #mayTrackChangesFor() method, but in any case if I
add this null check my code runs fine.
Aaron
-
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Re: [Wicket-user] NPE in Page#componentStateChanging
That is because the mayTrackChangesFor() method should only return true
when it makes a version manager. Why is that not the case?
If that method returns true the version manager can't be null because the
version info must be tracked.
johan
On 3/1/07, Aaron Hiniker [EMAIL PROTECTED] wrote:
I pulled the latest from trunk. And I am getting this NPE:
16:30:14,543 ERROR [STDERR] java.lang.NullPointerException
16:30:14,544 ERROR [STDERR] at
wicket.Page.componentStateChanging(Page.java:327)
16:30:14,545 ERROR [STDERR] at
wicket.Component.addStateChange(Component.java:2553)
16:30:14,545 ERROR [STDERR] at
wicket.Component.setModel(Component.java:2191)
16:30:14,545 ERROR [STDERR] at
wicket.MarkupContainer.setModel(MarkupContainer.java:596)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.query(
ProductSearchPanel.java:144)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.ProductSearchPanel.onUpdate(
ProductSearchPanel.java:109)
16:30:14,546 ERROR [STDERR] at
com.edicorp.erp.web.components.search.FilterPanel.fireOnChange(
FilterPanel.java:74)
16:30:14,547 ERROR [STDERR] at
com.edicorp.erp.web.components.search.query.QueryPanel$QueryForm.onSubmit(
QueryPanel.java:197)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.delegateSubmit(Form.java:680)
16:30:14,547 ERROR [STDERR] at
wicket.markup.html.form.Form.onFormSubmitted(Form.java:396)
16:30:14,547 ERROR [STDERR] at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
I remember I was getting this NPE before, and I patched the source to
include this null check in Page.java:
final void componentStateChanging(final Component component,
Change change)
{
checkHierarchyChange(component);
dirty();
if (mayTrackChangesFor(component, null))
{
if ( versionManager != null )
versionManager.componentStateChanging(change);
}
}
It seems that everywhere else in Page.java there is a null check for
versionManager, except in this method. Not sure, but perhaps the
problem lies in the #mayTrackChangesFor() method, but in any case if I
add this null check my code runs fine.
Aaron
-
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[Wicket-user] NPE in Page#componentStateChanging
When doing an ajax update on a MarkupContainer containing a listview.. I am replacing the listview model before the update: java.lang.NullPointerException at wicket.Page.componentStateChanging(Page.java:327) at wicket.Component.addStateChange(Component.java:2551) at wicket.MarkupContainer.removeAll(MarkupContainer.java:510) at wicket.markup.html.list.ListView.setModel(ListView.java:514) at com.edicorp.erp.web.pages.admin.search.SpecEditPage$2.onNodeLinkClicked(SpecEditPage.java:79) at wicket.markup.html.tree.DefaultAbstractTree$9.onClick(DefaultAbstractTree.java:533) at wicket.markup.html.tree.DefaultAbstractTree$6.onClick(DefaultAbstractTree.java:467) at wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:77) at wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:164) at wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:216) at wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:97) at wicket.request.compound.DefaultEventProcessorStrategy.processEvents(DefaultEventProcessorStrategy.java:68) at wicket.request.compound.AbstractCompoundRequestCycleProcessor.processEvents(AbstractCompoundRequestCycleProcessor.java:56) at wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:938) at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:978) at wicket.RequestCycle.step(RequestCycle.java:1054) at wicket.RequestCycle.steps(RequestCycle.java:1125) at wicket.RequestCycle.request(RequestCycle.java:470) at wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:232) at wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:122) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595) Aaron - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
[Wicket-user] NPE in Page#componentStateChanging
I apologize if this gets sent twice.. my ISP smtp server is acting up. When doing an ajax update on a MarkupContainer containing a listview.. I am replacing the listview model before the update: java.lang.NullPointerException at wicket.Page.componentStateChanging(Page.java:327) at wicket.Component.addStateChange(Component.java:2551) at wicket.MarkupContainer.removeAll(MarkupContainer.java:510) at wicket.markup.html.list.ListView.setModel(ListView.java:514) at com.edicorp.erp.web.pages.admin.search.SpecEditPage$2.onNodeLinkClicked(SpecEditPage.java:79) at wicket.markup.html.tree.DefaultAbstractTree$9.onClick(DefaultAbstractTree.java:533) at wicket.markup.html.tree.DefaultAbstractTree$6.onClick(DefaultAbstractTree.java:467) at wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:77) at wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java:164) at wicket.ajax.AbstractDefaultAjaxBehavior.onRequest(AbstractDefaultAjaxBehavior.java:216) at wicket.request.target.component.listener.BehaviorRequestTarget.processEvents(BehaviorRequestTarget.java:97) at wicket.request.compound.DefaultEventProcessorStrategy.processEvents(DefaultEventProcessorStrategy.java:68) at wicket.request.compound.AbstractCompoundRequestCycleProcessor.processEvents(AbstractCompoundRequestCycleProcessor.java:56) at wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:938) at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:978) at wicket.RequestCycle.step(RequestCycle.java:1054) at wicket.RequestCycle.steps(RequestCycle.java:1125) at wicket.RequestCycle.request(RequestCycle.java:470) at wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:232) at wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:122) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595) Aaron - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] NPE in Page#componentStateChanging
On Wed, 14 Feb 2007, Aaron HIniker wrote: When doing an ajax update on a MarkupContainer containing a listview.. I am replacing the listview model before the update: To update a ListView with ajax, I just manipulate its list instead of replacing the whole model. To make removals work, I recreate the whole list component on update (do a new MyListView()...). This works for me, but if there is a better way to update ListViews via ajax, I'd be happy to know it. - Timo -- Timo Rantalaiho Reaktor Innovations OyURL: http://www.ri.fi/ - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] NPE in Page#componentStateChanging
it would be helpful to know the version -igor On 2/14/07, Aaron HIniker [EMAIL PROTECTED] wrote: When doing an ajax update on a MarkupContainer containing a listview.. I am replacing the listview model before the update: java.lang.NullPointerException at wicket.Page.componentStateChanging(Page.java:327) at wicket.Component.addStateChange(Component.java:2551) at wicket.MarkupContainer.removeAll(MarkupContainer.java:510) at wicket.markup.html.list.ListView.setModel(ListView.java:514) at com.edicorp.erp.web.pages.admin.search.SpecEditPage$2.onNodeLinkClicked( SpecEditPage.java:79) at wicket.markup.html.tree.DefaultAbstractTree$9.onClick( DefaultAbstractTree.java:533) at wicket.markup.html.tree.DefaultAbstractTree$6.onClick( DefaultAbstractTree.java:467) at wicket.ajax.markup.html.AjaxLink$1.onEvent(AjaxLink.java:77) at wicket.ajax.AjaxEventBehavior.respond(AjaxEventBehavior.java :164) at wicket.ajax.AbstractDefaultAjaxBehavior.onRequest( AbstractDefaultAjaxBehavior.java:216) at wicket.request.target.component.listener.BehaviorRequestTarget.processEvents (BehaviorRequestTarget.java:97) at wicket.request.compound.DefaultEventProcessorStrategy.processEvents( DefaultEventProcessorStrategy.java:68) at wicket.request.compound.AbstractCompoundRequestCycleProcessor.processEvents (AbstractCompoundRequestCycleProcessor.java:56) at wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:938) at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:978) at wicket.RequestCycle.step(RequestCycle.java:1054) at wicket.RequestCycle.steps(RequestCycle.java:1125) at wicket.RequestCycle.request(RequestCycle.java:470) at wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:232) at wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java :122) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter( ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke( StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke( StandardContextValve.java:178) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke( SecurityAssociationValve.java:175) at org.jboss.web.tomcat.security.JaccContextValve.invoke( JaccContextValve.java:74) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :105) at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke( CachedConnectionValve.java:156) at org.apache.catalina.core.StandardEngineValve.invoke( StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java :148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection (Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket( PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run( MasterSlaveWorkerThread.java:112) at java.lang.Thread.run(Thread.java:595) Aaron - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.phpp=sourceforgeCID=DEVDEV___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
