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From "Mark Thomas (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (BCEL-129) ClassFormatException when instrumenting a Java 5 class
Date Sat, 07 Mar 2015 19:44:39 GMT

     [ https://issues.apache.org/jira/browse/BCEL-129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mark Thomas resolved BCEL-129.
------------------------------
    Resolution: Fixed

No resposnse to request to re-test against trunk and no test case provided to enable someone
else to test it.

I am therefore going to assume that this was fixed long ago. If that isn;t the case and you
still see this issue on trunk, please feel free to re-open and provide a test case.

> ClassFormatException when instrumenting a Java 5 class
> ------------------------------------------------------
>
>                 Key: BCEL-129
>                 URL: https://issues.apache.org/jira/browse/BCEL-129
>             Project: Commons BCEL
>          Issue Type: Bug
>          Components: Main
>    Affects Versions: unspecified
>            Reporter: psramkumar
>            Assignee: Apache Commons Developers
>
> Hi ,
> I am using BCEL to instrument Java classes  of web applications in JDK1.6 ,1.5 .We encountered
a ClassFormat exception for classes using Generics which prevented application from loading.From
https://issues.apache.org/bugzilla/show_bug.cgi?id=33549 I saw a workaround to delete "LocalVariableTypeTable".
I followed that suggestion and loop through the attributes and deleted attribute named "LocalVariableTypeTable".
Still while loading the application I get a ClassFormatException.
> Example code in which I delete attribute "LocalvariableTypeTable" jc is JavaClass Object
> {code}
>         Method[] ma = jc.getMethods();
>         for(int i = 0, x = ma.length; i < x; i++) {
>             try {
>                 MethodGen mg = new MethodGen(ma[i],cg.getClassName(),cg.getConstantPool());
>                 Attribute[] atts = mg.getCodeAttributes();
>                 
>                 for (int j = 0; j < atts.length; j++) {
>                     if (atts[j].getNameIndex() == mg.getConstantPool().lookupUtf8("LocalVariableTypeTable"))
{
>                         mg.removeCodeAttribute(atts[j]);
>                     }
>                 }
>             } catch(Exception o1) {
>                 output.write("exception " + o1);   
>             }
>         }
> {code}
> Also I get other error
> {code}
> Caused by: java.lang.ClassFormatError: LVTT entry for 'patterns' in class file org/springframework/classname
does not match any LVT entry
> {code}
> and the application fails to load



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