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)
[java] at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
[java] at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
[java] at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
[java] at java.security.AccessController.doPrivileged(Native Method)
[java] at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
[java] at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
[java] at sun.misc.Launcher$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)
[java] at weblogic.ejb20.deployer.BeanInfoImpl.createBeanInfoImpl(BeanInfoImpl.java:327)
[java] at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.initializeBeanInfos(MBeanDeploymentInfoImpl.java:395)
[java] at weblogic.ejb20.deployer.MBeanDeploymentInfoImpl.<init>(MBeanDeploymentInfoImpl.java:126)
[java] at weblogic.ejb20.ejbc.EJBCompiler.setupEJB(EJBCompiler.java:128)
[java] at weblogic.ejbc20.runBody(ejbc20.java:358)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:79)
[java] at weblogic.ejbc20.main(ejbc20.java:460)
[java] Exception in thread "main"
[java] Java Result: 1

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"
setting. etc.
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!
[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] 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)
[java] at weblogic.ejbc20.runBody(ejbc20.java:358)
[java] at weblogic.utils.compiler.Tool.run(Tool.java:79)
[java] at weblogic.ejbc20.main(ejbc20.java:460)
[java] Exception in thread "main"
[java] Java Result: 1

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Greetings,
I seems to have a little bit of a problem.
I have a text file, generated by the javap -c <class_name> command,
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This myClass.txt is the input I've got. I do not have the myClass.class, from which it was generated.
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Compiled from Hello.java
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Method void main(java.lang.String[])
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* "This is usually caused by a null reference not caught by the KVM, or sometimes an instanceof sometime before."
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files have now been correctly set. I re-installed the files, and now
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When String instances in Constant Pool will be GC'ed?

Hi all,
I'm involved in an application development; where we are storing numerous string objects into multiple HashMaps. Since the string objects created/placed in HashMap may have duplicate values; we're calling String::intern() method to make use of String Constant Pool feature in Java. But, my concern is - When the Constant String instance will be removed from Pool? Is it follow the same behaviour that if no references are presentm it is eligible for GC; i.e., removal of an instance from all HashMaps?
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EJP wrote:
How do you figure?Doesn't say so in the Javadoc. It talks about another pool ...You're taking "A pool of strings, initially empty, is maintained privately by the class String." as meaning it's not "the constant pool"? I wouldn't interpret it that way. And based on the JVM spec, I don't see anything saying the intern()ed Strings go to a different pool than "the constant pool". And if it is a separate pool, then what does go into "the constant pool"?
http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html#22972
"A runtime constant pool is a per-class or per-interface runtime representation of the constant_pool table in a class file (§4.4). It contains several kinds of constants, ranging from numeric literals known at compile time to method and field references that must be resolved at run time. "
"Each runtime constant pool is allocated from the Java virtual machine's method area (§3.5.4)."
http://java.sun.com/docs/books/jvms/second_edition/html/Overview.doc.html#6656
"The Java virtual machine has a method area that is shared among all Java virtual machine threads. [...] It stores per-class structures such as the runtime constant pool, field and method data, and the code for methods and constructors [...]"
http://java.sun.com/docs/books/jvms/second_edition/html/ConstantPool.doc.html#73272
"The Java virtual machine maintains a per-type constant pool (§3.5.5),"
"A string literal (§2.3) is derived from a CONSTANT_String_info structure (§4.4.3) in the binary representation of a class or interface. The CONSTANT_String_info structure gives the sequence of Unicode characters constituting the string literal.
The Java programming language requires that identical string literals (that is, literals that contain the same sequence of characters) must refer to the same instance of class String. In addition, if the method String.intern is called on any string, the result is a reference to the same class instance that would be returned if that string appeared as a literal. Thus,
("a" + "b" + "c").intern() == "abc"
must have the value true.
To derive a string literal, the Java virtual machine examines the sequence of characters given by the CONSTANT_String_info structure.
If the method String.intern has previously been called on an instance of class String containing a sequence of Unicode characters identical to that given by the CONSTANT_String_info structure, then the result of string literal derivation is a reference to that same instance of class String.
Otherwise, a new instance of class String is created containing the sequence of Unicode characters given by the CONSTANT_String_info structure; that class instance is the result of string literal derivation. Finally, the intern method of the new String instance is invoked."
Edited by: jverd on Jan 23, 2012 8:09 AM

Diff b'ween Type pools & type Groups

Hi!
What is type pools & Can i know the difference between the Type pools & type Groups.

Hi,
Type Groups
Before Release 4.5A, it was not possible to define standalone types in the ABAP Dictionary to which you could refer using a TYPEaddition in an ABAP program. It was only possible to refer to flat structures. Structures in programs corresponded to the structures of database tables or structures in the ABAP Dictionary. In ABAP programs, you could only refer to database tables and structures in the ABAP Dictionary using LIKE. It was, however, possible to refer to individual components of the Dictionary type. Complex local data types such as internal tables or deep structures had no equivalent in the ABAP Dictionary. The solution to this from Release 3.0 onwards was to use type groups. Type groups were based on the include technique, and allowed you to store any type definitions globally in the Dictionary by defining them using TYPES statements.
The definition of a type group is a fragment of ABAP code which you enter in the ABAP Editor. The first statement for the type group pool is always:
TYPE-POOL pool.
After that, you define data types using the statement TYPES. It was also possible to define global constants using the CONSTANTS statement. All the names of these data types and constants must begin with the name of the type group and an underscore: pool_
In an ABAP program, you must declare a type group as follows before you can use it:
TYPE-POOLS pool.
This statement allows you to use all the data types and constants defined in the type group pool in your program. You can use several type groups in the same program.
Note:
As of release 6.40, you can also define data types and constants in the public visibility area of global classes, by which type groups can be completely replaced.
Regards
Sudheer

Jvm runtime constant pool

Hi there,
this is my query:
As we know java builds a constant pool for all the symbols if a class in a class file. This class file when loaded by VM, the constant pool is translated into the runtime constant pool in the method area of the Heap.
Does any one know if there is only 1 runtime constant pool per class or is it 1 per class instance(Object). The JVM spec did not clarify on this. Also if its 1 per class then how does the JVM know where all the instances of a class are while resolving references and also when garbage collecting???
thank a lot.
Rishabh.

rishabhchandra wrote:
As we know java builds a constant pool for all the symbols if a class in a class file. This class file when loaded by VM, the constant pool is translated into the runtime constant pool in the method area of the Heap.
Symbols?
It builds it for literals.
Does any one know if there is only 1 runtime constant pool per class or is it 1 per class instance(Object). Certainly not by instance.
And more likely it is per class loader. A class can't be unloaded unless its class loader is unloader so there would be no point in managing a pool per class when it could be managed via the class loader.
The JVM spec did not clarify on this. Nor should it. That is an implementation detail of how the VM is implemented.
Also if its 1 per class then how does the JVM know where all the instances of a class are while resolving references and also when garbage collecting???Not sure that question is sensical. The only reason it would need to know is because it is using the class. And the class might not own the pool, but it certainly references it.
As for garbage collection that only occurs in the context of this question if the class loader is collected.

Illegal constant pool type??

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