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List:       tomcat-user
Subject:    Re: .intermittent InvocationTargetException errors
From:       Christopher Schultz <chris () christopherschultz ! net>
Date:       2024-04-15 15:08:48
Message-ID: 02175b23-4d8f-46e8-86a6-b41bcf170f83 () christopherschultz ! net
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Rick,

On 4/15/24 10:04, Rick Noel wrote:
> Hello,
> 
> I am using Tomcat 10 with java 17.
> 
> I am getting itermitant jsp compile errors below.
> 
> Some times the page compiles correctly but sometimes the page hits result in below \
> errors............ 
> java.lang.reflect.InvocationTargetException
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
>  at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>  at java.base/java.lang.reflect.Method.invoke(Method.java:568)
> at com.radiovoodoo.display.EvalExpr.evalIdentifier(EvalExpr.java:317)
> at com.radiovoodoo.display.EvalExpr.eval(EvalExpr.java:57)

What is RadioVoodoo?

Is there more of the stack trace?

> I found this explanation for possible cause..........
> Normally "java.lang.reflect.InvocationTargetException" occurs when java compiler \
> finds 2 different classes with same name in 2 different packages. When you are \
> importing both classes at a time and when you are trying to create object of that \
> class it throws "java.lang.reflect.InvocationTargetException" exception . The \
> solution is that when you are creating the object of the class use package name \
> also along with class name so that compiler knows what class it has to use.

This is unlikely to be the explanation. I've never seen 
InvocationTargetException under the conditions described. The compiler 
should never allow you to import two classes with the same "simple" 
(without package) name, because it's impossible for it to then tell 
which one you mean in a given expression.

> I looked at my code in the jsp and the code in question could be mistaking for two \
> different classes. My code is meant to use  java.util.Timezone but my code also has \
> a  com.radiovoodoo.customer.Timezone class

What do your imports look like?

> So I thought ah ah will specifical declare the class the I want, so I changed
> From
> private TimeZone customerTimeZone;
> to
> private java.util.TimeZone customerTimeZone;
> 
> so that the compiler will not think to use com.radiovoodoo.customer.Timezone but \
> instead always use java.util.TimeZone But this had no effect.

What do your imports look like?

> I still get intermittent java.lang.reflect.InvocationTargetException
> Could this be a possible bug in   the class tomcat 10 uses to compile jsp   ->      \
> org.apache.jasper.servlet.JspServlet

It's possible, but not very likely. We have a pretty good set of unit 
tests, plus we aren't getting any reports from others that the compiler 
is failing in this way.

> Is there a different JspServlet class I could use to test that theory out?

I'm curious as to why RadioVoodoo is being invoked during compilation. 
Or is this happening during JSP execution, post-compile? A more complete 
stack trace would reveal that.

-chris

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