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ConcurrentModificationException in HeadPackRenderer when multiple simultanious calls are made to a view.

java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:349)
at com.asual.summer.lesspack.HeadPackRenderer.combineScripts(HeadPackRenderer.java:203)
at com.asual.summer.lesspack.HeadPackRenderer.encodeHeadResources(HeadPackRenderer.java:117)
at com.asual.summer.core.faces.HeadRenderer.encodeBegin(HeadRenderer.java:59)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:824)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:298)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:101)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
at com.asual.summer.core.faces.CompositeComponentRenderer.encodeChildren(CompositeComponentRenderer.java:83)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:300)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:305)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:101)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
at com.asual.summer.core.faces.CompositeComponentRenderer.encodeChildren(CompositeComponentRenderer.java:83)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
at com.asual.summer.core.view.HtmlView.renderMergedOutputModel(HtmlView.java:103)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1120)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:890)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:851)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:756)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.asual.summer.core.RequestFilter.doFilterInternal(RequestFilter.java:131)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:465)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)

When I try to iterate over a Map<String,Map<String, Object> with the followin code, a NPE is always thrown, because the 'item' var is always an empty string(most probably null before some casting occurs) in the second 'data-repeat' attribute statement.

 <ul data-repeat="${listAnnComparator.sortList(annotations.keySet())}" data-var="item">

   <li data-rendered="${item != 'sections' && item != 'debugAnnotations'}">
    <span>${item}</span>
    <ul data-repeat="${listAnnComparator.sortList(annotations.get(item).keySet())}" data-var="item2" data-rendered="${annotations.hasNext(item)}">

Web app using summer experiences the following behaviour deployed using Tomcat 6.0.24 on Ubuntu server: some time after deployment there is an error in opening some part of the application dependencies archive. As a result the entire web application crashes and only a restart of the container fix this. Looks as if there is a jar file being changed and reloading it fails, causing a restart of the server (fails too). Here is a related issue: http://forums.devshed.com/java-help-9/error-in-opening-zip-file-59448.html

Stack trace:
Sep 19, 2011 1:44:03 PM com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/META-INF/views/error.html]
javax.faces.FacesException: Error Checking Last Modified for jar:file:/opt/ontotext/lld_data/0.5/apache-tomcat-6.0.29/webapps/ROOT/WEB-INF/lib/summer-core-1.0.0.M3.jar!/META-INF/resources/cc/html.xhtml
at com.sun.faces.facelets.impl.DefaultFaceletCache._getLastModified(DefaultFaceletCache.java:160)
at com.sun.faces.facelets.impl.DefaultFaceletCache.access$000(DefaultFaceletCache.java:58)
at com.sun.faces.facelets.impl.DefaultFaceletCache$ExpiryChecker.isExpired(DefaultFaceletCache.java:217)
at com.sun.faces.facelets.impl.DefaultFaceletCache$ExpiryChecker.isExpired(DefaultFaceletCache.java:211)
at com.sun.faces.util.ExpiringConcurrentCache.containsKey(ExpiringConcurrentCache.java:152)
at com.sun.faces.facelets.impl.DefaultFaceletCache.isFaceletCached(DefaultFaceletCache.java:123)
at com.sun.faces.facelets.impl.DefaultFaceletFactory.needsToBeRefreshed(DefaultFaceletFactory.java:253)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.getComponentMetadata(FaceletViewHandlingStrategy.java:212)
at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:935)
at com.sun.faces.facelets.tag.jsf.CompositeComponentTagHandler.createComponent(CompositeComponentTagHandler.java:160)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.createComponent(ComponentTagHandlerDelegateImpl.java:431)
at com.sun.faces.facelets.tag.jsf.ComponentTagHandlerDelegateImpl.apply(ComponentTagHandlerDelegateImpl.java:144)
at javax.faces.view.facelets.DelegatingMetaTagHandler.apply(DelegatingMetaTagHandler.java:114)
at javax.faces.view.facelets.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:94)
at com.sun.faces.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:79)
at com.sun.faces.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:148)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.buildView(FaceletViewHandlingStrategy.java:734)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:358)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127)
at com.asual.summer.core.view.HtmlView.renderMergedOutputModel(HtmlView.java:103)
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1120)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:890)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:792)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:851)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:756)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.asual.summer.core.RequestFilter.doFilterInternal(RequestFilter.java:131)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:438)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:421)
at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:270)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:636)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.(ZipFile.java:131)
at java.util.jar.JarFile.(JarFile.java:150)
at java.util.jar.JarFile.(JarFile.java:87)
at sun.net.www.protocol.jar.URLJarFile.<init>(URLJarFile.java:90)
at sun.net.www.protocol.jar.URLJarFile.getJarFile(URLJarFile.java:66)
at sun.net.www.protocol.jar.JarFileFactory.get(JarFileFactory.java:86)
at sun.net.www.protocol.jar.JarURLConnection.connect(JarURLConnection.java:122)
at sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:150)
at com.sun.faces.facelets.impl.DefaultFaceletCache._getLastModified(DefaultFaceletCache.java:157)
... 47 more

MessageResource not support help_message_en_GB.properties pattern

I found that , in https://github.com/asual/summer/blob/8635d0799db7588c7ebf7e989a11e99294951b83/modules/core/src/main/java/com/asual/summer/core/resource/MessageResource.java

use (_\\w+){0,3}\\.(properties|xml) regex to replace file name

when file is help_message_en_GB.properties,result is help