Reflection error (Illegal constant pool index)

Heya,
I use reflection to invoke Java classes and I get Error:
java.lang.ClassFormatError: AppendToElement (Illegal constant pool index)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:431)
     at XCOClassLoader.loadClass(XCOClassLoader.java:74)
// AppendToElement is name of class I want to invoke
I have bunch of classes from someone else, which I need to invoke and I get this error for all of them. When I invoke classes written (and compiled) by me, everything is OK.
It seems that the problem is that, these external classes were compiled with different version of Java. As they were written by someone else and I don't have source code, I can't recompile them.
Is cause of that problem, different JVM versions ? Is there a way how to correct it on runtime ?
Thanks,
Michal

The problem isn't one of versions. The files have become corrupted somehow. I suggest you ask for another copy.

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Illegal constant pool index ????

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Illegal constant pool type??

Hi there,
Anyone knows what's going on here????? any help appreciated!
[java] java.lang.ClassFormatError: com/bellsouth/estore/cbs/sbvs/relatedaccount/ejb/RelatedAccountServiceBean
(Illegal constant pool type]
[java] at java.lang.ClassLoader.defineClass0(Native Method)
[java] at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
[java] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
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[java] at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
[java] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:290)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
[java] at weblogic.ejb20.deployer.BeanInfoImpl.loadClass(BeanInfoImpl.java:297)
[java] at weblogic.ejb20.deployer.BeanInfoImpl.<init>(BeanInfoImpl.java:155)
[java] at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.<init>(ClientDrivenBeanInfoImpl.java:157)
[java] at weblogic.ejb20.deployer.SessionBeanInfoImpl.<init>(SessionBeanInfoImpl.java:103)
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Bt the way, there could be another tricky issue. If one uses CVS and checks
in ejbjar without setting -kb on it, the ejbjar that is cheked out will be
broken,
at least for default CVS settings.
Slava
"Cameron Purdy" <[email protected]> wrote in message
news:[email protected]...
It looks like a malformed class file. Run the verifier (or javap) against
that class. Turn off JAR compression. Transport files via ftp with the"bin"
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Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"Dong" <[email protected]> wrote in message
news:[email protected]...
Hi there,
Anyone knows what's going on here????? any help appreciated!
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(Illegal constant pool type]
[java] at java.lang.ClassLoader.defineClass0(Native Method)
[java] at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
[java] atjava.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
[java] atjava.net.URLClassLoader.defineClass(URLClassLoader.java:248)
[java] at
java.net.URLClassLoader.access$100(URLClassLoader.java:56)
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
[java] at java.security.AccessController.doPrivileged(NativeMethod)
[java] atjava.net.URLClassLoader.findClass(URLClassLoader.java:188)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
[java] atsun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:290)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
[java] atweblogic.ejb20.deployer.BeanInfoImpl.loadClass(BeanInfoImpl.java:297)
[java] atweblogic.ejb20.deployer.BeanInfoImpl.<init>(BeanInfoImpl.java:155)
[java] at
weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.<init>(ClientDrivenBeanInfo
Impl.java:157)
[java] at
weblogic.ejb20.deployer.SessionBeanInfoImpl.<init>(SessionBeanInfoImpl.java:
103)
[java] at
weblogic.ejb20.deployer.BeanInfoImpl.createBeanInfoImpl(BeanInfoImpl.java:32
7)
[java] at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDep
loymentInfoImpl.java:395)
[java] at
weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfoIm
pl.java:126)
[java] atweblogic.ejb20.ejbc.EJBCompiler.setupEJB(EJBCompiler.java:128)
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Illegal constant pool type error

hi friends,
i would like to know the possible causes of this error ... i got this as soon as i deployed a class into tomcat ... Given below is the entire error i got while starting the tomcat server .....
java.lang.ClassFormatError: com/infraportal/servlets/ipInitializer (Illegal cons
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at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(Webapp
ClassLoader.java:1677)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoa
der.java:900)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1350)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoa
der.java:1230)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.
java:979)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:88
7)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContex
t.java:3959)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
284)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:85
0)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:638)
at org.apache.catalina.core.StandardHostDeployer.install(StandardHostDep
loyer.java:320)
at org.apache.catalina.core.StandardHost.install(StandardHost.java:875)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.j
ava:727)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:477
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1008)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
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at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1134)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:832)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1126)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:521
at org.apache.catalina.core.StandardService.start(StandardService.java:5
19)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:234
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at org.apache.catalina.startup.Catalina.start(Catalina.java:594)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
i will be glad to see some quick answers / comments on this
thanks and regards
venky

This error can be caused by a corrupt class file. Check it was transferred correctly.

Java.lang.ClassFormatError: JavaBanner (Illegal constant pool type)

How do I resolve this error? If you know please e-mail me @ [email protected] . Thank You. Thomas

Why do you post the same thing in two different threads? Check the other thread. If you haven't got over it, give me the complete stack trace and the other details.

Is there any change in the constant pool entires with JDK1.4?

Hi,
Here is my simple java class,
class Base
String manuf = "MRF";
class Derived extends Base
Derived() {
manuf = "ABC";
After compiling this class with JDK 1.3 and JDK1.4, i could see the difference in constant pool entries
so please let me know more about these cahnges.
P.S. : written a java program TClass.java to browse the constant pool entries.
i.e if compiled with JDK1.3 , constant pool entries looks as follows,
E:\bugs\jdk1.4\pramila>java TClass E:\bugs\jdk1.4\pramila\Derived.class
There are 21 + 1 entries in the Constant Pool:
Index Tag Reference(s)/Value(s)
1 10 5 15
2 8 16
3 9 5 17
4 7 18
5 7 19
6 1 <init>
7 1 ()V
8 1 Code
9 1 LineNumberTable
10 1 LocalVariableTable
11 1 this
12 1 LDerived;
13 1 SourceFile
14 1 Test.java
15 12 6 7
16 1 ABC
17 12 20 21
18 1 Derived
19 1 Base
20 1 manuf
21 1 Ljava/lang/String;
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Code array in method <init> of length 11 starting at byte 231.
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There are 21 + 1 entries in the Constant Pool:
Index Tag Reference(s)/Value(s)
1 10 5 15
2 8 16
3 9 4 17
4 7 18
5 7 19
6 1 <init>
7 1 ()V
8 1 Code
9 1 LineNumberTable
10 1 LocalVariableTable
11 1 this
12 1 LDerived;
13 1 SourceFile
14 1 Test.java
15 12 6 7
16 1 ABC
17 12 20 21
18 1 Derived
19 1 Base
20 1 manuf
21 1 Ljava/lang/String;
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Code array in method <init> of length 11 starting at byte 231.
There is a change in the index 3 can be noticed.
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with JDK1.4 it is "3 9 4 17"
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Pramila

javac v1.4 emits by default Java 1.2 compatible .class files while all javac implementations since between 1.1.0 and 1.3.1 emit byte default Java 1.1 .class files.
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Resolving constant-pool of clazz Luicc/access/fileadministration/AdminFileV

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Many Thanks!!!
Eric

Hi,
Thanks for your reply.
I have tried to put the export file structure in the build path, but I am still getting the same error:
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Can you pls be specific on the steps to include the export file into the build path? I could be getting the steps wrong. Otherwise, do you have any suggestions?
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Eric

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