You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@commons.apache.org by "Emmanuel Bourg (JIRA)" <ji...@apache.org> on 2014/04/23 16:42:15 UTC
[jira] [Updated] (BCEL-129) ClassFormatException when instrumenting
a Java 5 class
[ https://issues.apache.org/jira/browse/BCEL-129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Emmanuel Bourg updated BCEL-129:
--------------------------------
Description:
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
was:
Hi ,
I am using Bcel to instrument java classes of webapplications in JDK1.6 ,1.5 .We encountered 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 application I get ClassFormatException.
Example code in which i delete attribute "LocalvariableTypeTable" jc is JavaClass Object
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);
}
}
Also i get other error
Caused by: java.lang.ClassFormatError: LVTT entry for 'patterns' in class file org/springframework/classname does not match any LVT entry
and application fails to load
Priority: Major
Environment: (was: Operating System: Windows XP
Platform: PC)
Summary: ClassFormatException when instrumenting a Java 5 class (was: problem using bcel in jdk15)
> 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
--
This message was sent by Atlassian JIRA
(v6.2#6252)