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https://issues.apache.org/jira/browse/WW-4984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16694322#comment-16694322
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Daniel Le Berre commented on WW-4984:
-------------------------------------
Do you mean that setting that constant to false should prevent the NPE to
occur? It does not seem to work for me.
> Static files like css and js files in struts-core not properly served
> ---------------------------------------------------------------------
>
> Key: WW-4984
> URL: https://issues.apache.org/jira/browse/WW-4984
> Project: Struts 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.5.18
> Reporter: Daniel Le Berre
> Assignee: Yasser Zamani
> Priority: Major
> Fix For: 2.6, 2.5.19
>
>
> While preparing a small demo of struts2 for my students I was annoyed that
> error messages were not shown in red.
> While investigating why, I noticed a lot of errors like this in the console:
> {code:java}
> GRAVE: "Servlet.service()" pour la servlet [default] a généré une exception
> java.lang.NullPointerException
> at
> org.apache.struts2.dispatcher.DefaultStaticContentLoader.findStaticResource(DefaultStaticContentLoader.java:199)
> at
> org.apache.struts2.dispatcher.ExecuteOperations.executeStaticResourceRequest(ExecuteOperations.java:59)
> at
> org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:128)
> at
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
> at
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
> at
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
> at
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
> at
> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
> at
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
> at
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
> at
> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
> at
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
> at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
> at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
> at
> org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
> at
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:770)
> at
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
> at
> org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
> at
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
> at
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
> at java.base/java.lang.Thread.run(Thread.java:844)
> {code}
>
> While looking at the HTML source of the page and web inspector of my browser,
> I also noted that three ressources were not found in that page:
>
> {code:java}
> /struts/utils.js
> /struts/css_xhtml/styles.css
> /struts/css_xhtml/validation.js
> {code}
>
>
> AFAIK, those resources should be served by default from struts-core jar file
> because
> {code:java}
> <constant name="struts.serve.static" value="true" />{code}
> by default.
> I could check that setting that constant to false prevents the NPE to occur.
> I was able to find the three files in struts-core jar file.
> I could check that copying those files in my webapp with the constant to
> false fixed my css issue regarding error messages.
> So the NPE is related IMHO to DefaultStaticContentLoader not being able to
> locate correctly the resources in the jar. I do not know why.
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