I instead used the property er.extensions.ERXEC.editingContextClassName to
specify the ForgetfulEC which I had change to be subclassed from ERXEC
However, with the call to undoManager().removeAllActions() seems to tread on
some toes; a later endUndoGrouping() called by some other code is now falling
over with this exception...
- <er.extensions.appserver.ERXComponentRequestHandler>: Exception occurred
while handling request:
java.lang.IllegalStateException: endUndoGrouping: undo manager is in invalid
state, endUndoGrouping called with no matching begin
Oct 10 09:33:25 InraxServer[8888] DEBUG NSLog - Handle Application Exception
Reporting exception at: 09:33
From: Application.handleException()
Original Request IP: 192.168.0.124 URI:
/cgi-bin/WebObjects/InraxServer.woa/-8888/wo/0g6rgMRRb2p4aTaQYIIW7g/0.1.0.1.0
Session: 0g6rgMRRb2p4aTaQYIIW7g
Component: com.webobjects.eodistribution.WOJavaClientApplet
Exception message: endUndoGrouping: undo manager is in invalid state,
endUndoGrouping called with no matching begin
Stack Trace...
java.lang.IllegalStateException: endUndoGrouping: undo manager is in invalid
state, endUndoGrouping called with no matching begin
at
com.webobjects.foundation.NSUndoManager.endUndoGrouping(NSUndoManager.java:565)
at
com.webobjects.eodistribution.EODistributionContext.responseToClientMessage(EODistributionContext.java:626)
at
com.webobjects.eodistribution.WOJavaClientApplet.handleClientRequest(WOJavaClientApplet.java:978)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
...
On 10 Oct 2014, at 09:50, John Pollard <[email protected]> wrote:
> Thanks, I will give this a try.
> I am using Java Client, not sure about the "applets" bit.
> Currently the client session ec is created using
> ERXEC.newEditingContext(objStore)
> So should I...
> Create a sublcass of ERXEC.DefaultFactory and override
> _createEditingContext() in it, to return a ForgetfulEC
> Install my factory using ERXEC.setFactory()
> Anything else?
> Thanks
> John
>
> On 9 Oct 2014, at 17:27, Chuck Hill <[email protected]> wrote:
>
>> First question, are you using JavaClient applets?
>>
>> Below is a Java class that might both explain and solve what you are seeing.
>>
>>
>> Chuck
>>
>>
>> package net.global_village.eofextensions;
>>
>> import com.webobjects.eocontrol.*;
>>
>> /**
>> * EOEditingContext that clears undo stack after a successful save. This is
>> used as a work around for a bug in EOF. There is a rather serious bug when
>> validateForDelete() fails to allow a deletion. This will occur if you are
>> using the Deny delete rule, the relationship is mandatory, or you have a
>> custom validateForDelete() method. The error occurs in this scenario:<br>
>> * 1. The editing context has multiple generations, meaning that
>> saveChanges() has been called one or more times after one or more EOs has
>> been created / inserted / updated.<br>
>> * 2. An EO is deleted from the editing context by deleteObject().<br>
>> * 3. saveChanges() fails due to an NSValidation.ValidationException raised
>> in validateForDelete.<br>
>> *
>> * This result of this appears to be that undo() is called on the editing
>> context's undo manager too many times. Instead of rolling back to the state
>> when saveChanges() was called it rolls back past several of previous
>> saveChanges()! The result of this is that the editing context shows a
>> historical state that does not match the object store or the database.
>> *
>> * @author Copyright (c) 2001-2005 Global Village Consulting, Inc. All
>> rights reserved.
>> * This software is published under the terms of the Educational Community
>> License (ECL) version 1.0,
>> * a copy of which has been included with this distribution in the
>> LICENSE.TXT file.
>> * @version $Revision: 7$
>> */
>> public class ForgetfulEC extends EOEditingContext
>> {
>>
>>
>> /**
>> * Designated constructor. Creates a new ForgetfulEC object with
>> anObjectStore as its parent
>> * object store.
>> *
>> * @param anObjectStore parent object store
>> */
>> public ForgetfulEC(EOObjectStore anObjectStore)
>> {
>> super(anObjectStore);
>> }
>>
>>
>>
>> /**
>> * Creates a new ForgetfulEC object with the default parent object store
>> as its parent object
>> * store.
>> */
>> public ForgetfulEC()
>> {
>> super();
>> }
>>
>>
>>
>> /**
>> * Overridden to clear undo stack after a successful save.
>> */
>> public void saveChanges()
>> {
>> super.saveChanges();
>> if (undoManager() != null)
>> {
>> undoManager().removeAllActions();
>> }
>> }
>>
>> }
>>
>>
>> On 2014-10-09, 7:22 AM, "John Pollard" wrote:
>>
>> My trap set up in takeStoredValueForKey() for my intermittent has triggered
>> reporting my bug where an attribute is being set to null. However, the stack
>> trace below doesn't come from anywhere obvious in my code. It is server side
>> processing a client request and for some reason there is an "undo" being
>> triggered from WOJavaClientApplet.handleClientRequest()
>>
>> My trap fires off when the attribute is being changed from a non-null value
>> to a null value, which should never happen, but it is.
>>
>> Furthermore, in my trap I make sure I don't call
>> super.takeStoredValueForKey() if I can see the attribute is about to be set
>> to null...but somehow the value is still being set to null on the database.
>>
>> Any thoughts welcome!
>>
>> John
>>
>> at mp.gen.Utils.getStackTraceAsString(Utils.java:2819)
>> at mp.eo.Transaction.takeStoredValueForKey(Transaction.java:1920)
>> at
>> com.webobjects.eocontrol.EOCustomObject.updateFromSnapshot(EOCustomObject.java:581)
>> at
>> er.extensions.eof.ERXGenericRecord.updateFromSnapshot(ERXGenericRecord.java:1267)
>> at
>> com.webobjects.eocontrol.EOEditingContext._undoUpdate(EOEditingContext.java:1629)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>> at
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at com.webobjects.foundation.NSSelector.invoke(NSSelector.java:358)
>> at
>> com.webobjects.foundation.NSSelector._safeInvokeSelector(NSSelector.java:110)
>> at
>> com.webobjects.foundation.NSUndoManager$_NSUndoLightInvocation.invoke(NSUndoManager.java:1002)
>> at
>> com.webobjects.foundation.NSUndoManager$_NSUndoStack.popAndInvoke(NSUndoManager.java:1280)
>> at
>> com.webobjects.foundation.NSUndoManager.undoNestedGroup(NSUndoManager.java:733)
>> at com.webobjects.foundation.NSUndoManager.undo(NSUndoManager.java:693)
>> at
>> com.webobjects.eodistribution.EODistributionContext.responseToClientMessage(EODistributionContext.java:627)
>> at
>> com.webobjects.eodistribution.WOJavaClientApplet.handleClientRequest(WOJavaClientApplet.java:978)
>> at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)
>> at
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>> at java.lang.reflect.Method.invoke(Method.java:622)
>> at
>> com.webobjects.foundation.NSKeyValueCoding$ValueAccessor$1.methodValue(NSKeyValueCoding.java:636)
>> at
>> com.webobjects.foundation.NSKeyValueCoding$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
>> at
>> com.webobjects.foundation.NSKeyValueCoding$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1324)
>> at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:1736)
>> at
>> com.webobjects.foundation.NSKeyValueCoding$Utility.valueForKey(NSKeyValueCoding.java:447)
>> at
>> com.webobjects.foundation.NSKeyValueCodingAdditions$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:212)
>> at
>> com.webobjects.appserver.WOComponent.valueForKeyPath(WOComponent.java:1804)
>> at
>> com.webobjects.appserver._private.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
>> at
>> com.webobjects.appserver._private.WOGenericElement.invokeAction(WOGenericElement.java:121)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WOGenericContainer.invokeAction(WOGenericContainer.java:29)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at
>> com.webobjects.appserver._private.WOConditional.invokeAction(WOConditional.java:86)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
>> at
>> com.webobjects.appserver._private.WOComponentReference.invokeAction(WOComponentReference.java:127)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
>> at
>> com.webobjects.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
>> at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:1079)
>> at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
>> at
>> com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:1745)
>> at
>> er.extensions.appserver.ajax.ERXAjaxApplication.invokeAction(ERXAjaxApplication.java:119)
>> at
>> er.extensions.appserver.ERXApplication.invokeAction(ERXApplication.java:1988)
>> at
>> er.extensions.appserver.ERXComponentRequestHandler._dispatchWithPreparedPage(ERXComponentRequestHandler.java:157)
>> at
>> er.extensions.appserver.ERXComponentRequestHandler._dispatchWithPreparedSession(ERXComponentRequestHandler.java:235)
>> at
>> er.extensions.appserver.ERXComponentRequestHandler._dispatchWithPreparedApplication(ERXComponentRequestHandler.java:268)
>> at
>> er.extensions.appserver.ERXComponentRequestHandler._handleRequest(ERXComponentRequestHandler.java:302)
>> at
>> er.extensions.appserver.ERXComponentRequestHandler.handleRequest(ERXComponentRequestHandler.java:378)
>> at
>> com.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:1687)
>> at
>> er.extensions.appserver.ERXApplication.dispatchRequestImmediately(ERXApplication.java:2109)
>> at
>> er.extensions.appserver.ERXApplication.dispatchRequest(ERXApplication.java:2074)
>> at mpServer.Application.dispatchRequest(Application.java:168)
>> at
>> com.webobjects.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
>> at
>> com.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:226)
>> at java.lang.Thread.run(Thread.java:701)
>> On 12 Sep 2014, at 09:18, John Pollard <[email protected]> wrote:
>>
>>> Hmm, hairy palms, not sure I want that, but thanks for this anyway. The
>>> related attribute is a to-one relationship, does that mean it is a FK
>>> attribute? It is the to-one relationship that becomes null against my will
>>> and I need to find out where/why.
>>>
>>> I have now cobbled some code up in takeStoredValueForKey() which avoids the
>>> recursion when checking the existing value using storedValueForKey() and
>>> ignores the (temp) null value caused by clearProperties() when the EO is
>>> invalidated. Hence I believe I now have the code to scream if my property
>>> is set to null from a pre-existing value and I should get an email + stack
>>> trace to report the exciting news. These intermittents are about once every
>>> two months so will have to wait.
>>>
>>> On 11 Sep 2014, at 23:04, Chuck Hill <[email protected]> wrote:
>>>
>>>> You are going to grow hair on your palms doing this but…
>>>>
>>>> willRead();
>>>> Object value = __dictionary().valueForKey(“your attribute”);
>>>>
>>>> Should, I think, do what you want. Of course, it is package protected so
>>>> you will need to use reflection to get access. And the result may be null
>>>> if the object is still a fault.
>>>>
>>>> Is this an FK or PK by chance?
>>>>
>>>>
>>>> Chuck
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 2014-09-11, 12:22 PM, "John Pollard" wrote:
>>>>
>>>> Apologies, I meant takeStoredValueForKey(). Within there, how can I safely
>>>> see what the value currently is when when this method is called, before I
>>>> invoke super. takeStoredValueForKey() to take on the new value?
>>>> John
>>>>
>>>> On 11 Sep 2014, at 18:10, John Huss <[email protected]> wrote:
>>>>
>>>>> The order of calls is:
>>>>>
>>>>> takeValueForKey -> setXXX -> takeStoredValueForKey
>>>>>
>>>>> All of these maybe skipped except for takeStoredValueForKey, so that is
>>>>> the only one you should override to see what is getting saved.
>>>>>
>>>>>
>>>>> On Thu, Sep 11, 2014 at 8:55 AM, John Pollard <[email protected]> wrote:
>>>>> Hi List,
>>>>>
>>>>> In some debugging within takeValueForKey() I want to find out if the key
>>>>> already has a value set. If I call valueForKey() or storedValueForKey()
>>>>> and the value isn't already set I get infinite recursion as it triggers a
>>>>> fault and tries to load with takeValueForKey() and so on.
>>>>>
>>>>> I am trying to debug where a value is being set to null, but apparently
>>>>> not going via validateXXX() or setXXX() methods, so I want to trap the
>>>>> case where the takeValueForKey() is passed null when the key value was
>>>>> previously non-null and log a stack trace.
>>>>>
>>>>> Thanks
>>>>> John
>>>>> _______________________________________________
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>>>>>
>>>>> This email sent to [email protected]
>>>>>
>>>>
>>>
>>
>
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