struts2 showcase throws NPE when starting app server
----------------------------------------------------
Key: WW-2203
URL: https://issues.apache.org/struts/browse/WW-2203
Project: Struts 2
Issue Type: Bug
Components: Examples
Affects Versions: 2.1.x
Environment: Using Java 1.6.0_02 on Windows XP, I pulled the struts
source from SVN and used maven 2.0.7 to build. Once done, I imported the
struts2-showcase war file into my eclipse WTP installation and set it to use my
Tomcat 5.5.23.
Reporter: Wes Wannemacher
Priority: Minor
When attempting to access the struts2-showcase app, tomcat is unable to deploy
it and there is an NPE in the console. It is as follows -
2007-09-24 13:13:15,750 ERROR
(org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/struts2-showcase]:3639)
- Exception starting filter struts
java.lang.NullPointerException
at
org.apache.struts2.config.StrutsXmlConfigurationProvider.needsReload(StrutsXmlConfigurationProvider.java:165)
at
com.opensymphony.xwork2.config.ConfigurationManager.conditionalReload(ConfigurationManager.java:165)
at
com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:59)
at
org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:827)
at
org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:202)
at
org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
at
org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
at
org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
at
org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
at
org.apache.catalina.core.StandardContext.start(StandardContext.java:4222)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
at
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at
org.apache.catalina.core.StandardService.start(StandardService.java:448)
at
org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
The offending code is -
@Override
public boolean needsReload() {
ActionContext ctx = ActionContext.getContext();
return ctx.get(reloadKey) == null && super.needsReload();
}
The NPE is thrown in the return statement. I would assume that ctx is null. I
would write a patch, but I am not sure what should be returned if there is no
action context. If it helps any, I am also building xwork2 from scratch (using
SVN and maven). When building xwork2 on my system, the
XmlConfigurationProviderTest unit test has a failure. This seems odd to me
though, since this exception is thrown during tomcat and/or context startup.
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