java.lang.ClassCircularityError
Hi all, I am using Tomcat 5.0 with JBoss 3.2.6. In a very rare cases I got the error as java.lang.ClassCircularityError(myclass). Does anybody know wahy this error is coming. Thanks, Jagadish - Yahoo! for Good Click here to donate to the Hurricane Katrina relief effort.
Re: java.lang.ClassCircularityError
HI Andoni,
Thanks for the reply, It uses association that too unidirectional, I
have seen the option in sun forum as have you explained to me. I tried to
compile classes like this for just to get that error. This scenario won't
compile, It gave me a error saying cycling inheritence.
Do you know any other scenarios which could cause this problem.
Thanks,
Jagadish
Andoni [EMAIL PROTECTED] wrote:
Hi Jagadish,
Do you have a drawing of all your inheritance relationships? This error seems
to be caused by a circular inheritance relationship i.e.:
class ClassOne extends ClassTwo {
...
}
class ClassTwo extends ClassOne {
...
}
Obviously there could be many more than two classes involved so it may be best
to draw out the class tree. Specially if it is complicated.
Hope that helps.
Andoni.
- Original Message -
From: Jagadeesha T
To: tomcat-user@jakarta.apache.org
Sent: Wednesday, October 05, 2005 9:01 AM
Subject: java.lang.ClassCircularityError
Hi all,
I am using Tomcat 5.0 with JBoss 3.2.6. In a very rare cases I got the error as
java.lang.ClassCircularityError(myclass). Does anybody know wahy this error is
coming.
Thanks,
Jagadish
-
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Click here to donate to the Hurricane Katrina relief effort.
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Click here to donate to the Hurricane Katrina relief effort.
Re: java.lang.ClassCircularityError
HI,
Thanks for the reply, It is being working correctly all these days. Only once
I got this error.After restarting the server worked fine. Only one time I got
this error. But I have not done
as you mentioned. I am very curious to know why is this suddenly came which was
working all these days and gone after restarted the server.
Thanks,
Jagadish
Leon Rosenberg [EMAIL PROTECTED] wrote:
Just some thoughts...
if you write two classes A and B
B extends A
then compile
then put B into deployment
change B to not extend A and A to extend B, compile A
put A into deployment
Then you'll probably have your runtime circularity.
Try to delete all your class files and recompile your application from scratch.
regards
Leon
On 10/5/05, Jagadeesha T wrote:
HI Andoni,
Thanks for the reply, It uses association that too unidirectional, I have
seen the option in sun forum as have you explained to me. I tried to compile
classes like this for just to get that error. This scenario won't compile, It
gave me a error saying cycling inheritence.
Do you know any other scenarios which could cause this problem.
Thanks,
Jagadish
Andoni wrote:
Hi Jagadish,
Do you have a drawing of all your inheritance relationships? This error seems
to be caused by a circular inheritance relationship i.e.:
class ClassOne extends ClassTwo {
...
}
class ClassTwo extends ClassOne {
...
}
Obviously there could be many more than two classes involved so it may be
best to draw out the class tree. Specially if it is complicated.
Hope that helps.
Andoni.
- Original Message -
From: Jagadeesha T
To: tomcat-user@jakarta.apache.org
Sent: Wednesday, October 05, 2005 9:01 AM
Subject: java.lang.ClassCircularityError
Hi all,
I am using Tomcat 5.0 with JBoss 3.2.6. In a very rare cases I got the error
as
java.lang.ClassCircularityError(myclass). Does anybody know wahy this error
is coming.
Thanks,
Jagadish
-
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Click here to donate to the Hurricane Katrina relief effort.
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Click here to donate to the Hurricane Katrina relief effort.
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XPowered BY
HI all, I use JBoss 3.2.6 and and Tomcat 5.0. It displays X-PoweredBY version in Headers file, There is in web.xml to CommonHeadersFileter, InitParams, Even after deleting it from web.xml, it display, Is there any way to do that in Tomcat 5.0 with JBoss. Thanks, Jagadeesha T __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
document for upgrade
HI, Could any body tell me tomcat upgradation document location from 3.x to 4.x or 5.x. Regards, Jagadish - Start your day with Yahoo! - make it your home page
Session Security
Hi All, Cookie information goes to the server in a clear text I think. I don't know it can be configured to send as a cypher text. When it goes in the network to browser, If not ssl enabled, Cookie;Jsessionid;value can be seen through Ethereal and also copied, If anybody tries with that cookie with the url. It will take the person to directly to that page.How can disable it. Please could anybody tell me how to avoid it. Thanks, Jagadeesha T __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
Re: session management
Hi, Thanks the reply, My requirement is little different. I want to have many browser instaces (2 or more)to use the same session. In my first.jsp, on first hit, i will get the session and store it. Again,if the first jsp is hit for the second time. It should use the same session. SO, I will not let it allow to create a new one. Instead use the one already stored for user. I have to do like this since the user login is done from a Java Applacition(Swing). If the user wants to go to a browser. User has to click on the button (Swing UI) that will launch the browser. each click on the button should launch a browser. I want all those browsers launched for that login to use a shared session object. Could you tell How can I do it. I tried by setting the cookie at the first.jsp when the second browser launch(Coolke which had created at the first hit). addCookie, In one of the middle jsps, there is response.sendRedirect(response.encodeURL(samepage?somename=somevalue)) Every time,it is failing here, response.sendRedirect(); //When it is reloaded i have observerd that it is not getting the cookie in the headers. I don't understand why the browser not sending the cookie. cookie is not disabled. Scenario 2. If all browser uses different session objects. then it works fine. could you tell me is there any way to get this done? Thanks, Jagadish Lionel Farbos [EMAIL PROTECTED] wrote: On Thu, 31 Mar 2005 11:41:55 -0800 (PST) Jagadeesha T wrote: Hi all, I want to set session in httpservletresponse object, Is there any way to do it. Otherthan response.addCookie(), or response.encodeURL(); Is there any way to set the Jsession In headers, So that it gets that in the next Jsp by request object, If I use addCookie of response object, It fails if any where encodeURL is used. If i user encodeURL, every JSP needs to updated with that method. Please if anybody knows tell the way that can be done. You don't have to create yourself the cookie. You create the HttpSession with HttpServletRequest.getSession() or HttpServletRequest.getSession(boolean) Then, the session is created and the cookie JSESSIONID is added to the HttpServletResponse. So, the next time you'll invoke a servlet or JSP in the same Context (with the same browser), the Cookie JSESSIONID will be attached to your request. If you have clustered your Tomcat, the JSESSIONID will have a suffix ., so, if you use the mod_jk to load-balance your tomcat clustered servers, your request will be sent to the same tomcat (as the precedent). Enjoy Thanks, Jagadeesha T - Do you Yahoo!? Better first dates. More second dates. Yahoo! Personals - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - Do you Yahoo!? Better first dates. More second dates. Yahoo! Personals
session management
Hi all, I want to set session in httpservletresponse object, Is there any way to do it. Otherthan response.addCookie(), or response.encodeURL(); Is there any way to set the Jsession In headers, So that it gets that in the next Jsp by request object, If I use addCookie of response object, It fails if any where encodeURL is used. If i user encodeURL, every JSP needs to updated with that method. Please if anybody knows tell the way that can be done. Thanks, Jagadeesha T - Do you Yahoo!? Better first dates. More second dates. Yahoo! Personals
Session Handling
Hi all, I need to launch a browser from a java application (swing) on the click of the button. Each click should launch a different instance of the browser. However, all these instances of the browser should share the same HttpSession (created on the launch of the first browser instance). Currently, have implemented this by setting a cookie in HttpServletResponse object. response.addCookie(new Cookie(jsessionid,sessionid)) response.sendRedirect(NextPage), In the above approach, all browser instances share the same session. This works fine. However, if the jsp invoked as part of sendRedirect uses response.encodeURL(), this approach does not work. When the encoreURL() method is used, the session id is not set correctly (a different session id is being set). Not sure how/why the session id is different in this case. Any idea why? Or is there any other way of sharing a session for all the browsers. I am using Tomcat version 5.0, Thanks, Jagadeesha T - Do you Yahoo!? Yahoo! Mail - Easier than ever with enhanced search. Learn more.
ClassCastException
Hi,
There is a ClassCastException when we run the JspC class with the proper
arguments.
I have given the detailed exception at the end of this mail,
// In org.apache.jasper.JspC class code
private void initServletContext()
{
try
{
context = new JspCServletContext(new PrintWriter(System.out), new
URL(file: + uriRoot.replace('\\', '/') + '/'));
tldLocationsCache = new TldLocationsCache(context, true);
}
catch(MalformedURLException me)
{
System.out.println(** + me);
}
rctxt = new JspRuntimeContext(context, this);
jspConfig = new JspConfig(context);
tagPluginManager = new TagPluginManager(context);
}
In this method it creates the object of jspRunTimeContext
rctxt = new JspRuntimeContext(context, this);
// end JspC class code
// In org.apache.jasper.compiler.JspRuntimeContext class
In constructor of this class,
public JspRuntimeContext(ServletContext context, Options options){
jsps = Collections.synchronizedMap(new HashMap());
thread = null;
threadDone = false;
threadName = JspRuntimeContext;
System.setErr(new SystemLogHandler(System.err));
this.context = context;
this.options = options;
// The below line causing the exception to be thrown
parentClassLoader =
(URLClassLoader)Thread.currentThread().getContextClassLoader();
if(parentClassLoader == null)
parentClassLoader = (URLClassLoader)getClass().getClassLoader();
if(log.isDebugEnabled())
if(parentClassLoader != null)
log.debug(Localizer.getMessage(jsp.message.parent_class_loader_is,
parentClassLoader.toString()));
else
log.debug(Localizer.getMessage(jsp.message.parent_class_loader_is, none));
initClassPath();
if(context instanceof JspCServletContext)
return;
if(System.getSecurityManager() != null)
...
..}
// Here it is expecting the current thread class loader to be of type
URLClassLoader,
which is not,it is set with the AntClassLoader2..
Hence throwing the exception
parentClassLoader =
(URLClassLoader)Thread.currentThread().getContextClassLoader();
/// end of org.apache.jasper.compiler.JspRuntimeContext class
The reason is the current thread class loader has set in JspC after
JspRuntimeContext() object
creation call,
setting of current thread class loader to URLClassLoader is done in the below
given method in JspC class
private void initClassLoader(JspCompilationContext clctxt) method
// Begin JspC class
Thread.currentThread().setContextClassLoader(loader);
// end JspC class
The class loader, URLClassLoader is set to the current thread after the
exception is thrown from
org.apache.jasper.compiler.JspRuntimeContext, if it set before ,then it will
definitely work.
--- total flow.
from JspC class,
methods flow
Main() -- execute()--- initServletContext();
initServletContext() In this method creating the below object by calling the
only one constructor of
org.apache.jasper.compiler.JspRuntimeContext(context, option)
--
in org.apache.jasper.compiler.JspRuntimeContext
org.apache.jasper.compiler.JspRuntimeContext
taking the current thread class loader and expecting to be as URLClassloader,
exception thrown
---
in JspC
after this flow there is code to set the currentCLassLoader to URLClassLoader,
in initClassLoader(JspCompilationContext clctxt) method
this should be set before the creation of JspRuntimeContext object to avoid
this exception.
---
It would be great if we have precompilation feature.
I don't know if there is any other alternatives available for this,
I think we could do this. Please let me know if this is
considered already and have counter this problem.
---
The detailed exception is ...
The line numbers may not correct since i put some System.out.println()..
The code thrrowing the exception is
JspRuntimeContext costructor
parentClassLoader =
(URLClassLoader)Thread.currentThread().getContextClassLoader();
[java] java.lang.ClassCastException
[java] at
org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:172)
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:705)
[java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:177)
[java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:83)
[java] at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
[java] at org.apache.tools.ant.Task.perform(Task.java:364)
[java] at org.apache.tools.ant.Target.execute(Target.java:341)
[java] at org.apache.tools.ant.Target.performTasks(Target.java:369)
[java] at org.apache.tools.ant.Project.executeTarget(Project.java:1214)
[java] at org.apache.tools.ant.Project.executeTargets(Project.java:1062)
[java] at org.apache.tools.ant.Main.runBuild(Main.java:673)
[java] at
JspC exception
Hi, JspC error while doing PreCompilation, I 'am using ant 1.6.2 and tomcat 5. When I call jspc from ant it is thworing invaid cast exception. In JspRunTimeContext class. It is getting the current thread classloader and casting to URL classloader.. parentClassLoader = (URLClassLoader)Thread.currentThread().getContextClassLoader(); This is because Thread.currentThread().getContextClassLoader() is returning AntClassLoader. which is incompatible with URLClassLoader. Hence thrwoing ClassCastException. The detail exception is, Please don't consider the line number in the below stack Trace. The code thrwoing the exception is above given in bold font of org.apache.jasper.compiler.JspRuntimeContext class. [java] java.lang.ClassCastException [java] at org.apache.jasper.compiler.JspRuntimeContext.init(JspRuntimeContext.java:46) [java] at org.apache.jasper.JspC.initServletContext(JspC.java:866) [java] at org.apache.jasper.JspC.execute(JspC.java:735) [java] at org.apache.jasper.JspC.main(JspC.java:71) [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [java] at java.lang.reflect.Method.invoke(Method.java:324) [java] at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:193) [java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:130) [java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:705) [java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:177) [java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:83) [java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [java] at org.apache.tools.ant.Task.perform(Task.java:364) [java] at org.apache.tools.ant.Target.execute(Target.java:341) [java] at org.apache.tools.ant.Target.performTasks(Target.java:369) [java] at org.apache.tools.ant.Project.executeTarget(Project.java:1214) [java] at org.apache.tools.ant.Project.executeTargets(Project.java:1062) [java] at org.apache.tools.ant.Main.runBuild(Main.java:673) [java] at org.apache.tools.ant.Main.startAnt(Main.java:188) [java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196) [java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55) I 'am stuck up in this, This is a class loader issue. It would be a great help if anybody has a solution for this. After this exception, there is a code to set current thread class loader to URL classLoader in JspC.java. Regards, Jagga - Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term'
JSPC problems
Hi all, I 'am trying to do jspPreCompilation, it is thrwing away saying. ClassCastExcception. Class java.util.HashMap loaded from parent loader (parentFirst) Class java.util.Collections loaded from parent loader (parentFirst) Class java.io.ByteArrayOutputStream loaded from parent loader (parentFirst) [java] java.lang.ClassCastException [java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:172) [java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:705) [java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:177) [java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:83) [java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275) [java] at org.apache.tools.ant.Task.perform(Task.java:364) [java] at org.apache.tools.ant.Target.execute(Target.java:341) [java] at org.apache.tools.ant.Target.performTasks(Target.java:369) [java] at org.apache.tools.ant.Project.executeTarget(Project.java:1214) [java] at org.apache.tools.ant.Project.executeTargets(Project.java:1062) [java] at org.apache.tools.ant.Main.runBuild(Main.java:673) [java] at org.apache.tools.ant.Main.startAnt(Main.java:188) [java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:196) [java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:55) [java] Caused by: java.lang.ClassCastException [java] at org.apache.jasper.compiler.JspRuntimeContext.init(JspRuntimeContext.java:95) [java] at org.apache.jasper.JspC.initServletContext(JspC.java:1005) [java] at org.apache.jasper.JspC.execute(JspC.java:870) [java] at org.apache.jasper.JspC.main(JspC.java:196) [java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [java] at java.lang.reflect.Method.invoke(Method.java:324) [java] at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:193) [java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:130) [java] ... 13 more [java] --- Nested Exception --- [java] java.lang.ClassCastException [java] at org.apache.jasper.compiler.JspRuntimeContext.init Please if anybody got this error and got it solved.Please could you help out to run precompilation. Regards, Jagga - Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term'
jspc classcasst exception: error while casting ANTClassloader to URLclassLoader
Hi all, it is throwing ClassCastexception in JSPRuntimeCOntext class when casting ANTClassLoader class to URLCLassLoader. I don't whether it is a bug. or configuration problems. Regards, Jagga - Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term'
Session Objects
Hi all, I' am storing session objects in a SINGLEON class object to keep all active sessions. Does it give any problems in clustered enviornment since singleton is a static referrence. Regards, Jagga __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
RE: Session Objects
Thanks for responding. To manage session between an apllication and web servers. Is there any way to get that worked in clustered enviornment? Thanks Jagga Dale, Matt [EMAIL PROTECTED] wrote: Yes it will, this won't work accross a cluster. You need to use the regular session manager. Is there any reason why you put the sessions in a singleton? Ta Matt -Original Message- From: Jagadeesha T [mailto:[EMAIL PROTECTED] Sent: 08 February 2005 17:25 To: tomcat-user@jakarta.apache.org Subject: Session Objects Hi all, I' am storing session objects in a SINGLEON class object to keep all active sessions. Does it give any problems in clustered enviornment since singleton is a static referrence. Regards, Jagga __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Any opinions expressed in this E-mail may be those of the individual and not necessarily the company. This E-mail and any files transmitted with it are confidential and solely for the use of the intended recipient. If you are not the intended recipient or the person responsible for delivering to the intended recipient, be advised that you have received this E-mail in error and that any use or copying is strictly prohibited. If you have received this E-mail in error please notify the beCogent postmaster at [EMAIL PROTECTED] Unless expressly stated, opinions in this email are those of the individual sender and not beCogent Ltd. You must take full responsibility for virus checking this email and any attachments. Please note that the content of this email or any of its attachments may contain data that falls within the scope of the Data Protection Acts and that you must ensure that any handling or processing of such data by you is fully compliant with the terms and provisions of the Data Protection Act 1984 and 1998. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - Do you Yahoo!? All your favorites on one personal page Try My Yahoo!
