Kai created WW-5054:
-----------------------

             Summary: Debugging Interceptor debug=browser not working
                 Key: WW-5054
                 URL: https://issues.apache.org/jira/browse/WW-5054
             Project: Struts 2
          Issue Type: Bug
          Components: Core Interceptors
    Affects Versions: 2.5.22, 2.5.20
            Reporter: Kai


I am unable to get the debugging interceptor with the parameter _debug=browser_ 
to work.

According to this Link 
[https://struts.apache.org/getting-started/debugging-struts.html] i should get 
the dojo plugin. But the dojo plugin is not available for struts 2.5.x.

If i hit the action with _debug=browser&%23parameters_ i will see the 
parameters, but can't expand the link even though i have the <s:head/> in the 
header of my jsp set.
{code:java}
2020-01-09 10:37:10,144 ERROR [http-nio-8080-exec-13] 
debugging.DebuggingInterceptor$3 (DebuggingInterceptor.java:237) - Unable to 
create debugging console
java.lang.NullPointerException: null
        at 
org.apache.struts2.interceptor.debugging.ObjectToHTMLWriter.write(ObjectToHTMLWriter.java:67)
 ~[struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.debugging.DebuggingInterceptor$3.beforeResult(DebuggingInterceptor.java:220)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:269)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:179)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:49)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.doIntercept(ConversionErrorInterceptor.java:142)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:201)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:67)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:133)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:89)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:101)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:142)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:160)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:175)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:121)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:167)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:203)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:196)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.factory.StrutsActionProxy.execute(StrutsActionProxy.java:48) 
[struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:574) 
[struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.dispatcher.ExecuteOperations.executeAction(ExecuteOperations.java:79)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:141)
 [struts2-core-2.5.20.jar:2.5.20]
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) 
[catalina.jar:8.5.34]
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) 
[catalina.jar:8.5.34]
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
 [catalina.jar:8.5.34]
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) 
[catalina.jar:8.5.34]
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) 
[tomcat-coyote.jar:8.5.34]
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
 [tomcat-coyote.jar:8.5.34]
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806)
 [tomcat-coyote.jar:8.5.34]
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
 [tomcat-coyote.jar:8.5.34]
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) 
[tomcat-coyote.jar:8.5.34]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
[?:1.8.0_202]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
[?:1.8.0_202]
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
 [tomcat-util.jar:8.5.34]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_202]
{code}
 



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