Re: java.util.ConcurrentModificationException at IteratorComponent
I believe this exception occurs when you try and modify an ArrayList while iterating over said list. ArrayList is not thread safe. Regards, Randy Burgess Sr. Web Applications Developer Nuvox Communications From: Othon Reyes Sanchez [EMAIL PROTECTED] Reply-To: Struts Users Mailing List user@struts.apache.org Date: Tue, 26 Feb 2008 12:39:40 -0600 To: user@struts.apache.org Subject: java.util.ConcurrentModificationException at IteratorComponent I get the following exception when i do some stress test with jmeter. java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.next(Unknown Source) at org.apache.struts2.components.IteratorComponent.end( IteratorComponent.java:246) at org.apache.struts2.views.jsp.IteratorTag.doAfterBody( IteratorTag.java:68) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fiterator_005f0 (frmPrestamo_jsp.java:1595) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fform_005f0 (frmPrestamo_jsp.java:640) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspService (frmPrestamo_jsp.java:186) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java :98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:328) at org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:315) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:188) at org.apache.catalina.core.ApplicationDispatcher.invoke( ApplicationDispatcher.java:691) at org.apache.catalina.core.ApplicationDispatcher.processRequest( ApplicationDispatcher.java:469) at org.apache.catalina.core.ApplicationDispatcher.doForward( ApplicationDispatcher.java:403) at org.apache.catalina.core.ApplicationDispatcher.forward( ApplicationDispatcher.java:301) at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute( ServletDispatcherResult.java:139) at org.apache.struts2.dispatcher.StrutsResultSupport.execute( StrutsResultSupport.java:178) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult( DefaultActionInvocation.java:348) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:253) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept( DefaultWorkflowInterceptor.java:221) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept( ValidationInterceptor.java:150) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIn tercept (AnnotationValidationInterceptor.java:48) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept( ConversionErrorInterceptor.java:123) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept( ParametersInterceptor.java:167) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86)
Re: java.util.ConcurrentModificationException at IteratorComponent
do you know a collection that is thread safe? On Tue, Feb 26, 2008 at 12:42 PM, Randy Burgess [EMAIL PROTECTED] wrote: I believe this exception occurs when you try and modify an ArrayList while iterating over said list. ArrayList is not thread safe. Regards, Randy Burgess Sr. Web Applications Developer Nuvox Communications From: Othon Reyes Sanchez [EMAIL PROTECTED] Reply-To: Struts Users Mailing List user@struts.apache.org Date: Tue, 26 Feb 2008 12:39:40 -0600 To: user@struts.apache.org Subject: java.util.ConcurrentModificationException at IteratorComponent I get the following exception when i do some stress test with jmeter. java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.next(Unknown Source) at org.apache.struts2.components.IteratorComponent.end( IteratorComponent.java:246) at org.apache.struts2.views.jsp.IteratorTag.doAfterBody( IteratorTag.java:68) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fiterator_005f0 (frmPrestamo_jsp.java:1595) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fform_005f0 (frmPrestamo_jsp.java:640) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspService (frmPrestamo_jsp.java:186) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java :98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:328) at org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:315) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java :265) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:188) at org.apache.catalina.core.ApplicationDispatcher.invoke( ApplicationDispatcher.java:691) at org.apache.catalina.core.ApplicationDispatcher.processRequest( ApplicationDispatcher.java:469) at org.apache.catalina.core.ApplicationDispatcher.doForward( ApplicationDispatcher.java:403) at org.apache.catalina.core.ApplicationDispatcher.forward( ApplicationDispatcher.java:301) at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute( ServletDispatcherResult.java:139) at org.apache.struts2.dispatcher.StrutsResultSupport.execute( StrutsResultSupport.java:178) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult( DefaultActionInvocation.java:348) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:253) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept ( DefaultWorkflowInterceptor.java:221) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept( ValidationInterceptor.java:150) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIn tercept (AnnotationValidationInterceptor.java:48) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept ( ConversionErrorInterceptor.java:123) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221)
Re: java.util.ConcurrentModificationException at IteratorComponent
--- Othon Reyes Sanchez [EMAIL PROTECTED] wrote: do you know a collection that is thread safe? Look in the JavaDocs: not only are there thread-safe collections but there are utility methods to create them from non-thread-safe collections. As I said in your JIRA post you should post the action and JSP that's actually causing the problem. You also state that your action is in the session, which would concern me a little. Are you actually attempting to modify the collection somewhere, or is it a display-only list? Dave - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: java.util.ConcurrentModificationException at IteratorComponent
You stick to your code. However, update your code part such that when create your ArrayList, do it as Collections.synchronizedList(new ArrayList(...)). Also, you must be removing or updating object directly inside your list object which is why you're getting this error. Try to get a reference to Iterator from your ArrayList object and invoke remove or add methods via the Iterator to get away from the ConcurrentModificationException. HTH Eduardo On Wed, Feb 27, 2008 at 5:48 AM, Othon Reyes Sanchez [EMAIL PROTECTED] wrote: do you know a collection that is thread safe? On Tue, Feb 26, 2008 at 12:42 PM, Randy Burgess [EMAIL PROTECTED] wrote: I believe this exception occurs when you try and modify an ArrayList while iterating over said list. ArrayList is not thread safe. Regards, Randy Burgess Sr. Web Applications Developer Nuvox Communications From: Othon Reyes Sanchez [EMAIL PROTECTED] Reply-To: Struts Users Mailing List user@struts.apache.org Date: Tue, 26 Feb 2008 12:39:40 -0600 To: user@struts.apache.org Subject: java.util.ConcurrentModificationException at IteratorComponent I get the following exception when i do some stress test with jmeter. java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.next(Unknown Source) at org.apache.struts2.components.IteratorComponent.end( IteratorComponent.java:246) at org.apache.struts2.views.jsp.IteratorTag.doAfterBody( IteratorTag.java:68) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fiterator_005f0 (frmPrestamo_jsp.java:1595) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspx_meth_s_0 05fform_005f0 (frmPrestamo_jsp.java:640) at org.apache.jsp.jupiters2.archivo.jsp.expediente.frmPrestamo_jsp._jspService (frmPrestamo_jsp.java:186) at org.apache.jasper.runtime.HttpJspBase.service( HttpJspBase.java :98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:328) at org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:315) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java :265) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter( ApplicationFilterChain.java:188) at org.apache.catalina.core.ApplicationDispatcher.invoke( ApplicationDispatcher.java:691) at org.apache.catalina.core.ApplicationDispatcher.processRequest( ApplicationDispatcher.java:469) at org.apache.catalina.core.ApplicationDispatcher.doForward( ApplicationDispatcher.java:403) at org.apache.catalina.core.ApplicationDispatcher.forward( ApplicationDispatcher.java:301) at org.apache.struts2.dispatcher.ServletDispatcherResult.doExecute( ServletDispatcherResult.java:139) at org.apache.struts2.dispatcher.StrutsResultSupport.execute( StrutsResultSupport.java:178) at com.opensymphony.xwork2.DefaultActionInvocation.executeResult( DefaultActionInvocation.java:348) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:253) at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept ( DefaultWorkflowInterceptor.java:221) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile( UtilTimerStack.java:455) at com.opensymphony.xwork2.DefaultActionInvocation.invoke( DefaultActionInvocation.java:221) at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept( ValidationInterceptor.java:150) at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIn tercept (AnnotationValidationInterceptor.java:48) at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept( MethodFilterInterceptor.java:86) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:224) at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling( DefaultActionInvocation.java:223) at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(
Re: java.util.ConcurrentModificationException at IteratorComponent
--- Eduardo Dela Rosa [EMAIL PROTECTED] wrote: Also, you must be removing or updating object directly inside your list object which is why you're getting this error. Try to get a reference to Iterator from your ArrayList object and invoke remove or add methods via the Iterator to get away from the ConcurrentModificationException. Strictly speaking I don't believe that's necessarily true; one can get a ConcurrentModificationException depending on how a map object is accessed in the iterator. (Not totally relevant since we're talking about lists, but thought I'd throw that out there.) Dave - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: java.util.ConcurrentModificationException at IteratorComponent
You are right there. And I guess the best way to rid this exception then is to have the code part in synchronized block, i.e., synchronizing on the list object itself + get the iterator + invoke either add or remove inside the block. This will hurt the performance a bit BUT will preserve the integrity of the content of the list. On Wed, Feb 27, 2008 at 9:50 AM, Dave Newton [EMAIL PROTECTED] wrote: --- Eduardo Dela Rosa [EMAIL PROTECTED] wrote: Also, you must be removing or updating object directly inside your list object which is why you're getting this error. Try to get a reference to Iterator from your ArrayList object and invoke remove or add methods via the Iterator to get away from the ConcurrentModificationException. Strictly speaking I don't believe that's necessarily true; one can get a ConcurrentModificationException depending on how a map object is accessed in the iterator. (Not totally relevant since we're talking about lists, but thought I'd throw that out there.) Dave - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Eduardo Dela Rosa
Re: java.util.ConcurrentModificationException at IteratorComponent
Or just use a Vector instead of an ArrayList, which is synchronized. Regards, Randy Burgess Sr. Web Applications Developer Nuvox Communications From: Eduardo Dela Rosa [EMAIL PROTECTED] Reply-To: Struts Users Mailing List user@struts.apache.org Date: Wed, 27 Feb 2008 09:59:25 +1100 To: Struts Users Mailing List user@struts.apache.org Subject: Re: java.util.ConcurrentModificationException at IteratorComponent You are right there. And I guess the best way to rid this exception then is to have the code part in synchronized block, i.e., synchronizing on the list object itself + get the iterator + invoke either add or remove inside the block. This will hurt the performance a bit BUT will preserve the integrity of the content of the list. On Wed, Feb 27, 2008 at 9:50 AM, Dave Newton [EMAIL PROTECTED] wrote: --- Eduardo Dela Rosa [EMAIL PROTECTED] wrote: Also, you must be removing or updating object directly inside your list object which is why you're getting this error. Try to get a reference to Iterator from your ArrayList object and invoke remove or add methods via the Iterator to get away from the ConcurrentModificationException. Strictly speaking I don't believe that's necessarily true; one can get a ConcurrentModificationException depending on how a map object is accessed in the iterator. (Not totally relevant since we're talking about lists, but thought I'd throw that out there.) Dave - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Eduardo Dela Rosa This email and any attachments (Message) may contain legally privileged and/or confidential information. If you are not the addressee, or if this Message has been addressed to you in error, you are not authorized to read, copy, or distribute it, and we ask that you please delete it (including all copies) and notify the sender by return email. Delivery of this Message to any person other than the intended recipient(s) shall not be deemed a waiver of confidentiality and/or a privilege. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: java.util.ConcurrentModificationException at IteratorComponent
No no, I mean that even if you're not modifying the map you can get a concurrent modification exception by accessing the map via OGNL's [] notation, just in an s:property.../ tag. Dave --- Eduardo Dela Rosa [EMAIL PROTECTED] wrote: You are right there. And I guess the best way to rid this exception then is to have the code part in synchronized block, i.e., synchronizing on the list object itself + get the iterator + invoke either add or remove inside the block. This will hurt the performance a bit BUT will preserve the integrity of the content of the list. On Wed, Feb 27, 2008 at 9:50 AM, Dave Newton [EMAIL PROTECTED] wrote: --- Eduardo Dela Rosa [EMAIL PROTECTED] wrote: Also, you must be removing or updating object directly inside your list object which is why you're getting this error. Try to get a reference to Iterator from your ArrayList object and invoke remove or add methods via the Iterator to get away from the ConcurrentModificationException. Strictly speaking I don't believe that's necessarily true; one can get a ConcurrentModificationException depending on how a map object is accessed in the iterator. (Not totally relevant since we're talking about lists, but thought I'd throw that out there.) Dave - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] -- Eduardo Dela Rosa - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: java.util.ConcurrentModificationException
When you iterate the vector in your action are you modifying its contents in any way (ie: using add or remove, etc...)? -Original Message- From: Richard Aukland [mailto:[EMAIL PROTECTED] Sent: Thursday, 8 July 2004 20:46 To: [EMAIL PROTECTED] Subject: java.util.ConcurrentModificationException Dear All, I am having problems with java.util.ConcurrentModificationException. I have a FormBean memberForm which contains a Vector of membershipTypeForms. Whenever I try and access the membershipTypeForms through an iterator in my Action, (Data Access class) I get the exception. In my jsp I use logic:iterate to iterate through the vector and apart from this I dont seem to have any other iterators using the collection. Is the iterator tag likely to be the problem, if so does anybosy have any idea how to fox this? or should I be searching through the rest of my code for some kind of reference? Many thanks for any help Richard - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: java.util.ConcurrentModificationException
Thankyou Andrew,
I am probably being a total java kook as I am fairly new, but here is
my code;
//need to go through the membershipTypeForm and build array of value
objects which we update with data tier
Iterator it = membershipTypesForm.getMembershipTypes_().iterator();
MembershipTypeBeanValue value[] = new
MembershipTypeBeanValue[membershipTypesForm.getMembershipTypes_().size
()];
int count=0;
while(it.hasNext()){
MembershipTypeForm form = (MembershipTypeForm)it.next();
value[count] = new MembershipTypeBeanValue();
BeanUtils.copyProperties(value[count],form);
}
It is the Class cast which causes the exception, I assume that this
must not be possible then?
many thanks
Richard
When you iterate the vector in your action are you modifying its
contents in
any way (ie: using add or remove, etc...)?
-Original Message-
From: Richard Aukland [mailto:[EMAIL PROTECTED]
Sent: Thursday, 8 July 2004 20:46
To: [EMAIL PROTECTED]
Subject: java.util.ConcurrentModificationException
Dear All,
I am having problems with java.util.ConcurrentModificationException.
I have a FormBean memberForm which contains a Vector of
membershipTypeForms.
Whenever I try and access the membershipTypeForms through an iterator
in my Action, (Data Access class) I get the exception.
In my jsp I use logic:iterate to iterate through the vector and
apart from this I dont seem to have any other iterators using the
collection.
Is the iterator tag likely to be the problem, if so does anybosy have
any idea how to fox this? or should I be searching through the rest
of my code for some kind of reference?
Many thanks for any help
Richard
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
RE: java.util.ConcurrentModificationException
Without looking deeper in to this could it be a case of :
while(it.hasNext()){
MembershipTypeForm form = (MembershipTypeForm)it.next();
value[count] = new MembershipTypeBeanValue();
BeanUtils.copyProperties(value[count],form);
count++; // -- this
}
-Original Message-
From: Richard Aukland [mailto:[EMAIL PROTECTED]
Sent: 08 July 2004 14:08
To: [EMAIL PROTECTED]
Subject: RE: java.util.ConcurrentModificationException
Thankyou Andrew,
I am probably being a total java kook as I am fairly new, but here is
my code;
//need to go through the membershipTypeForm and build array of value
objects which we update with data tier
Iterator it = membershipTypesForm.getMembershipTypes_().iterator();
MembershipTypeBeanValue value[] = new
MembershipTypeBeanValue[membershipTypesForm.getMembershipTypes_().size
()];
int count=0;
while(it.hasNext()){
MembershipTypeForm form = (MembershipTypeForm)it.next();
value[count] = new MembershipTypeBeanValue();
BeanUtils.copyProperties(value[count],form);
}
It is the Class cast which causes the exception, I assume that this
must not be possible then?
many thanks
Richard
When you iterate the vector in your action are you modifying its
contents in
any way (ie: using add or remove, etc...)?
-Original Message-
From: Richard Aukland [mailto:[EMAIL PROTECTED]
Sent: Thursday, 8 July 2004 20:46
To: [EMAIL PROTECTED]
Subject: java.util.ConcurrentModificationException
Dear All,
I am having problems with java.util.ConcurrentModificationException.
I have a FormBean memberForm which contains a Vector of
membershipTypeForms.
Whenever I try and access the membershipTypeForms through an iterator
in my Action, (Data Access class) I get the exception.
In my jsp I use logic:iterate to iterate through the vector and
apart from this I dont seem to have any other iterators using the
collection.
Is the iterator tag likely to be the problem, if so does anybosy have
any idea how to fox this? or should I be searching through the rest
of my code for some kind of reference?
Many thanks for any help
Richard
-
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
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