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https://issues.apache.org/struts/browse/WW-3062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45778#action_45778
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Musachy Barroso commented on WW-3062:
-------------------------------------
Martin can you post the stack trace of the exception, and the relevant part of
the JSP?
> //java.lang.NullPointerException at
> org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:792)..(UIBean
> fails when accessing tagNames Map in Map)
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: WW-3062
> URL: https://issues.apache.org/struts/browse/WW-3062
> Project: Struts 2
> Issue Type: Bug
> Components: Core Actions
> Affects Versions: 2.1.6
> Environment: (UIBean fails when accessing tagNames Map in Map)
> TC 6.0.14
> J2SE 1.6.10
> Struts 2.1.6
> Reporter: Martin Gainty
> Priority: Minor
>
> org.apache.struts2.components.UIBeans fails when accessing tagNames Map via
> parameters from evaluateParams
> public void evaluateParams() {
> .......
> //please read this caveat about using java.util.Map *from java.util.Map
> JavaDoc*
> //each key can map to at most ONE value.
> try
> {
> PageContext pageContext = ServletActionContext.getPageContext();
> java.util.ArrayList<String> tags=new java.util.ArrayList(50); //this
> will be the newly constructed List
> if (form != null )
> {
> addParameter("form", form.getParameters());
> if ( name != null )
> {
> // form.getParameters is a Map so you are accessing an inner Map
> in a Map?
> // List tags = (List) form.getParameters().get("tagNames");
> try
> { //go straight to Request ..pull the parameters via
> getParameterMap
> for (java.util.Iterator i =
> pageContext.getRequest().getParameterMap().values().iterator(); i.hasNext(); )
> {
> tags.add( i.next().toString() ); //this
> will be a live form-field tag
> }
> }
> catch(java.lang.ArrayIndexOutOfBoundsException aie)
> { //prevent walk beyond the end
> System.out.println("ArrayIndexException has
> been produced message = "+aie.getMessage() );
> log.debug(aie.getMessage() );
> }
> //java.lang.NullPointerException at
> org.apache.struts2.components.UIBean.evaluateParams(UIBean.java:792)
> // tags.add(name);
> }
> }
> }
> catch(java.lang.NullPointerException npe1)
> {
> System.out.println("Eating the exception in UIBean");
> log.debug( npe1.getMessage() )
> }
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