#2040 ✓resolved
Andrei Solntsev

ConcurrentModificationException in GroovyTemplateCompiler.endTag

Reported by Andrei Solntsev | March 7th, 2016 @ 09:02 AM | in 1.4.3 (closed)

Sometimes in development we get ConcurrentModificationException (see stack trace below) from GroovyTemplateCompiler.

The worther thing is that the list play.classloading.ApplicationClassloader#assignableClassesByName grows with every call of method play.templates.GroovyTemplateCompiler#endTag. Look lines 360-364 in GroovyTemplateCompiler:

                fastClasses = Play.classloader.getAssignableClasses(FastTags.class); // returns CACHED (global) list
                } catch (Exception xe) {
                    //
                }
                fastClasses.add(0, FastTags.class);

Framework version: 1.4.x
Stack trace:

@6pbfemcd1
Internal Server Error (500) for request GET /bank/loans

Oops: ConcurrentModificationException  
An unexpected error occured caused by exception ConcurrentModificationException: null

play.exceptions.UnexpectedException: Unexpected Error  
    at play.templates.TemplateCompiler.compile(TemplateCompiler.java:23)
    at play.templates.GroovyTemplateCompiler.compile(GroovyTemplateCompiler.java:42)
    at play.templates.TemplateCompiler.compile(TemplateCompiler.java:28)
    at play.templates.TemplateLoader.load(TemplateLoader.java:84)
    at play.templates.TemplateLoader.load(TemplateLoader.java:179)
    at util.ExtendedFastTags._includeLocal(ExtendedFastTags.java:107)
    at util.ExtendedFastTags$_includeLocal$1.call(Unknown Source)
    at {module:ibank}/app/views/Loans/_loanRow.html.(line:38)
    at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:263)
    at play.templates.FastTags._include(FastTags.java:414)
    at play.templates.FastTags$_include.call(Unknown Source)
    at {module:ibank}/app/views/Loans/list.html.(line:52)
    at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:263)
    at play.templates.FastTags._include(FastTags.java:414)
    at play.templates.FastTags$_include.call(Unknown Source)
    at {module:ibank}/app/views/Bank/loansAjax.html.(line:9)
    at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:263)
    at play.templates.Template.render(Template.java:26)
    at play.templates.GroovyTemplate.render(GroovyTemplate.java:211)
    at play.mvc.results.RenderTemplate.<init>(RenderTemplate.java:24)
    at play.mvc.Controller.renderTemplate(Controller.java:839)
    at play.mvc.Controller.renderTemplate(Controller.java:817)
    at play.mvc.Controller.render(Controller.java:879)
    at controllers.Bank.loansAjax(Bank.java:152)
    at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:544)
    at play.mvc.ActionInvoker.invoke(ActionInvoker.java:494)
    at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:489)
    at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:458)
    at play.mvc.ActionInvoker.invoke(ActionInvoker.java:162)
    at Invocation.HTTP Request(Play!)
Caused by: java.util.ConcurrentModificationException  
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at play.templates.GroovyTemplateCompiler.endTag(GroovyTemplateCompiler.java:372)
    at play.templates.TemplateCompiler.generate(TemplateCompiler.java:93)
    at play.templates.TemplateCompiler.compile(TemplateCompiler.java:15)
    at play.templates.GroovyTemplateCompiler.compile(GroovyTemplateCompiler.java:42)
    at play.templates.TemplateCompiler.compile(TemplateCompiler.java:28)
    at play.templates.TemplateLoader.load(TemplateLoader.java:84)
    at play.templates.TemplateLoader.load(TemplateLoader.java:179)
    at util.ExtendedFastTags._includeLocal(ExtendedFastTags.java:107)
    at util.ExtendedFastTags$_includeLocal$1.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at Template_1057$_run_closure1$_closure2$_closure3.doCall(_loanRow.html:118)
    at Template_1057$_run_closure1$_closure2$_closure3.doCall(_loanRow.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1057$_run_closure1$_closure2.doCall(_loanRow.html:4)
    at Template_1057$_run_closure1$_closure2.doCall(_loanRow.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1057$_run_closure1.doCall(_loanRow.html:3)
    at Template_1057$_run_closure1.doCall(_loanRow.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1212)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1057.run(_loanRow.html:2)
    at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:263)
    at play.templates.FastTags._include(FastTags.java:414)
    at play.templates.FastTags$_include.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at Template_1056$_run_closure1$_closure2$_closure3.doCall(list.html:47)
    at Template_1056$_run_closure1$_closure2$_closure3.doCall(list.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1056$_run_closure1$_closure2.doCall(list.html:4)
    at Template_1056$_run_closure1$_closure2.doCall(list.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1056$_run_closure1.doCall(list.html:3)
    at Template_1056$_run_closure1.doCall(list.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1212)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1056.run(list.html:2)
    at play.templates.GroovyTemplate.internalRender(GroovyTemplate.java:263)
    at play.templates.FastTags._include(FastTags.java:414)
    at play.templates.FastTags$_include.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at Template_1054$_run_closure1$_closure2$_closure3.doCall(loansAjax.html:14)
    at Template_1054$_run_closure1$_closure2$_closure3.doCall(loansAjax.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1054$_run_closure1$_closure2.doCall(loansAjax.html:4)
    at Template_1054$_run_closure1$_closure2.doCall(loansAjax.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.doMethodInvoke(Unknown Source)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:69)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1054$_run_closure1.doCall(loansAjax.html:3)
    at Template_1054$_run_closure1.doCall(loansAjax.html)
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
    at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1021)
    at groovy.lang.Closure.call(Closure.java:426)
    at groovy.lang.Closure.call(Closure.java:420)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:110)
    at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.access$400(GroovyCategorySupport.java:68)
    at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:250)
    at org.codehaus.groovy.runtime.DefaultGroovyMethods.use(DefaultGroovyMethods.java:407)
    at org.codehaus.groovy.runtime.dgm$755.invoke(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoMetaMethodSiteNoUnwrapNoCoerce.invoke(PogoMetaMethodSite.java:251)
    at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite.callCurrent(PogoMetaMethodSite.java:59)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallCurrent(CallSiteArray.java:52)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:154)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:174)
    at Template_1054.run(loansAjax.html:2)
    ... 14 more
<pre><code></code>
</pre>

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<h2>Creating a bug report</h2> Bug reports are incredibly helpful, so take time to report bugs and request features in our ticket tracker. We’re always grateful for patches to Play’s code. Indeed, bug reports with attached patches will get fixed far quickly than those without any.<br><br>

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