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https://issues.apache.org/jira/browse/VELOCITY-370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henning Schmiedehausen closed VELOCITY-370.
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> NullPointerException in Introspector.java
> -----------------------------------------
>
> Key: VELOCITY-370
> URL: https://issues.apache.org/jira/browse/VELOCITY-370
> Project: Velocity
> Issue Type: Bug
> Components: Engine
> Affects Versions: 1.5
> Environment: Operating System: Windows 2000
> Platform: PC
> Reporter: Reggie Riser
> Fix For: 1.5
>
>
> In line 116 of the getMethod method of Introspector.java, a
> NullPointerException
> can be thrown at this line:
> msg = msg + params[i].getClass().getName();
> The scenario was that an overloaded method in a tool class in my context was
> being called with a null parameter (i.e., params[i] was null). That resulted
> in
> an AmbiguousException correctly being thrown, but the error message being
> built
> in this method was never being shown because a NullPointerException occurred
> first. Looking at the code, you would expect to see something like this:
> Introspection Error : Ambiguous method invocation someOverloadedMethod( null)
> for class class com.blah.blah.MyTool
> Instead I was seeing this:
> ASTMethod.execute() : exception from introspection :
> java.lang.NullPointerException
> Easy fix should be:
> if (params[i] == null)
> msg = msg + "null";
> else
> msg = msg + params[i].getClass().getName();
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