Java.lang.ClassFormatError: Bad major version number

Hi friends,
I am using JWS2.0(trial version). I have uploaded class files into servlet (and respective packages), every thing was working fine. one fine day i started getting the 404 - file not found error(JWS not yet expired). I uninstalled the jws, j2sdk1.4.0, jre1.4.0 but with no result.
I even formated the system and loaded all again. But still i am getting the same problem.
The servlet is the simple HelloWorld servlet.
Through the SunExample its working fine. But the uploaded servlet is not getting recognised.
Here is the ErrorLog
[Tue Feb 22 17:26:29 GMT+05:30 2005] ClassLoaderFactory Error: Can not find Class : Hello [ ClassNotFoundException ]
[Tue Feb 22 17:26:31 GMT+05:30 2005] ClassLoaderError: (com.sun.server.loader.JarClassLoader@17d67e:\servlets) ERROR: Unable to load class local class Hello
[Tue Feb 22 17:26:31 GMT+05:30 2005] java.lang.ClassFormatError: Bad major version number
at java.lang.ClassLoader.defineClass(ClassLoader.java:219)
at com.sun.server.loader.ServletClassLoader.callDefineClass(ServletClassLoader.jav a:726)
at com.sun.server.loader.ServletClassLoader.checkAndDefineClass(ServletClassLoader .java:620)
at com.sun.server.loader.DirectoryClassLoader.getClassFromLocalDir(Compiled Code)
at com.sun.

Try re-compiling the Servlet. Make sure that the JDK version used to recompile is <= the version used to run the server (if you are using a higher jdk to compile the servlet, maybe Java 5.x, then you are to run, maybe Java 1.4.x, then use the -target option of javac to target the lower release...)

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Hi all,
I'm developing a mobile application but I got this error: ALERT: java/lang/ClassFormatError: Bad version information.
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J2ME web services 1.0 loaded.
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Java/lang/ClassFormatError: Bad version information.

Hi
When running the midlet in wireless tool kit the following
error is occuring
java/lang/ClassFormatError: Bad version information.
can any body suggest me wat the problem is

Hi,
answer is at http://forum.java.sun.com/thread.jspa?threadID=569449&tstart=0

ALERT: java/lang/ClassFormatError: Bad stack map.

Hello friends.
I need help. SOS.
Where is wrong in this code?
Problem is in comparision.
Comenting this lines, all are ok.
        if(time1==time2)
            System.out.println("Equal");
        else
            System.out.println("Different");C�digo del Midlet:
package borrame.pruebas;
import java.util.Date;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
public class Prueba extends MIDlet implements CommandListener {
    Display display;
    Form mainForm;
    // Comandos para salir y volver a la pantalla principal.
    Command cmdSalir;
    public Prueba() {
        super();
        mainForm = new Form ("HelloMidp");
        cmdSalir = new Command("Salir", Command.EXIT,1);
        mainForm.addCommand(cmdSalir);
        mainForm.setCommandListener(this);
    protected void startApp() throws MIDletStateChangeException {
        display = Display.getDisplay(this);
        display.setCurrent (mainForm);
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        long time2 = new Date().getTime() +100;
        System.out.println("time1: " + time1);
        System.out.println("time2: " + time2);
        System.out.println("time1 + time2 =" + (time1 + time2));
        if(time1==time2)
            System.out.println("Equal");
        else
            System.out.println("Different");
    protected void pauseApp() {
        // TODO Auto-generated method stub
    protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
        // TODO Auto-generated method stub
    public void commandAction(Command c, Displayable d) {
        if (c == cmdSalir) { // Selecciono salir de la aplicacion
            try {
                destroyApp(false);
            } catch (MIDletStateChangeException e) {
                e.printStackTrace();
            notifyDestroyed();
}Output console:
Warning: Cannot convert string "-b&h-lucida-medium-r-normal-sans-*-140-*-*-p-*-iso8859-1" to type FontStruct
Running with storage root DefaultColorPhone
ALERT: java/lang/ClassFormatError: Bad stack map.
Method............: b7d29990 'com/sun/midp/midlet/MIDletState.createMIDlet (static)'
Stack Chunk.......: b783d300
Frame Pointer.....: b783d3a4
Current IP........: b7da5669 = b7da565b + offset 14
Previous Frame....: b783d36c
Previous IP.......: b7d87f44 (offset 52)
Frame size........: 7 (1 arguments, 6 local variables)
Argument[0].......: b783cad0
Local[1]..........: b78b35c8
Local[2]..........: b7d87f41
Local[3]..........: b783cc38
Local[4]..........: b7d29788
Local[5]..........: b78b355c
Local[6]..........: 0
Operand[1]........: b783cad0
Method............: b7d16390 'com/sun/midp/midlet/Scheduler.schedule (virtual)'
Stack Chunk.......: b783d300
Frame Pointer.....: b783d36c
Current IP........: b7d87f44 = b7d87f10 + offset 52
Previous Frame....: b783d338
Previous IP.......: b7d92b05 (offset 28)
Frame size........: 7 (2 arguments, 5 local variables)
Argument[0].......: b783cd14
Argument[1].......: b783c460
Local[2]..........: b78b20c4
Local[3]..........: b78b3594
Local[4]..........: b7d92b01
Local[5]..........: b78b35a8
Local[6]..........: b7d162b0
Operand[1]........: b783cd14
Method............: b7d1e084 'com/sun/midp/main/Main.runLocalClass (static)'
Stack Chunk.......: b783d300
Frame Pointer.....: b783d338
Current IP........: b7d92b05 = b7d92ae9 + offset 28
Previous Frame....: b783d314
Previous IP.......: b7d9257c (offset 116)
Frame size........: 3 (1 arguments, 2 local variables)
Argument[0].......: b783d1bc
Local[1]..........: b783c460
Local[2]..........: b78b3570
Method............: b7d1dfe4 'com/sun/midp/main/Main.main (static)'
Stack Chunk.......: b783d300
Frame Pointer.....: b783d314
Current IP........: b7d9257c = b7d92508 + offset 116
Previous Frame....: 0
Previous IP.......: 1
Frame size........: 3 (1 arguments, 2 local variables)
Argument[0].......: b783d5ec
Local[1]..........: b783d1bc
Local[2]..........: b783cb24
VM status:
Instruction pointer.: b7da5669 (offset within invoking method: 14)
Next instruction....: 0x4c
Frame pointer.......: b783d3a4
Local pointer.......: b783d388
Stack size..........: 128; sp: b783d3bc; ranges: b783d308-b783d508;
Contents of the current stack frame:
    b783d388: b783cad0 (lp)
    b783d38c: b78b35c8
    b783d390: b7d87f41
    b783d394: b783cc38
    b783d398: b7d29788
    b783d39c: b78b355c
    b783d3a0: 0
    b783d3a4: b783d36c (fp)
    b783d3a8: b7d87f44
    b783d3ac: b783d384
    b783d3b0: b7d29990
    b783d3b4: b783d300
    b783d3b8: 0 (end of frame)
    b783d3bc: b783cad0 (sp)
Execution stack contains 184 items:
b783d5ec
b783d1bc
b783cb24
0
1
b78b3560
b7d1dfe4
b783d300
0
b783d1bc
b783c460
b78b3570
b783d314
b7d9257c
b783d328
b7d1e084
b783d300
0
b783cd14
b783c460
b78b20c4
b78b3594
b7d92b01
b78b35a8
b7d162b0
b783d338
b7d92b05
b783d34c
b7d16390
b783d300
0
b783cd14
b783cad0
b78b35c8
b7d87f41
b783cc38
b7d29788
b78b355c
0
b783d36c
b7d87f44
b783d384
b7d29990
b783d300
0
b783cad0
Execution completed.
717374 bytecodes executed
5 thread switches
742 classes in the system (including system classes)
3720 dynamic objects allocated (102340 bytes)
2 garbage collections (88196 bytes collected)
Execution completed.
717374 bytecodes executed
5 thread switches
742 classes in the system (including system classes)
3720 dynamic objects allocated (102340 bytes)
2 garbage collections (88196 bytes collected)

My enviroment:
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Sun JDK 1.4.2.10
eclipse 3.2 WTP 1.5
eclipseme 1.5.5
Midlet config:
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MicroEdition-Profile: MIDP-1.0
WTK 2.2
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I suppose that eclipseme corrupt my classes in build process.
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My radical solution. I use eclipse without eclipseme, and i use ktoolbar to build, run, package, etc...
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at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.lang.ClassLoader.defineClass(ClassLoader.java:465)
at com.sun.tools.javac.v8.GenerateClass$Loader.findClass(GenerateClass.j
ava:273)
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at org.exolab.castor.mapping.loader.AbstractMappingLoader.resolveType(Ab
stractMappingLoader.java:384)
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ngLoader.java:209)
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criptors(AbstractMappingLoader.java:262)
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ava:156)
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haller.java:128)
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hi,
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Edited by: sagar_birari on Mar 27, 2008 5:47 AM
Edited by: sagar_birari on Mar 27, 2008 7:20 AM

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     at java.awt.Component.processEvent(Unknown Source)
     at java.awt.Container.processEvent(Unknown Source)
     at java.awt.Component.dispatchEventImpl(Unknown Source)
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     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
     at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
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     at java.awt.Window.dispatchEventImpl(Unknown Source)
     at java.awt.Component.dispatchEvent(Unknown Source)
     at java.awt.EventQueue.dispatchEvent(Unknown Source)
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     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
     at java.awt.EventDispatchThread.run(Unknown Source).
The portion of my code responsible for this is:
final JTextField jtf = new JTextField(termAndYear[1]);
jtf.addKeyListener(new JTextFieldFormat(jtf,4));
jtf.addFocusListener(new java.awt.event.FocusAdapter() {
public void focusGained(FocusEvent e) {
jtf.setCaretPosition(0);
jtf.selectAll();
Apart from that action, the application works just fine. The interesting thing is, this does not happen if I run the application locally using the required jar files. It only happens when deployed with Java Web Start.
I'll appreciate any help. Thanks

hi,
it looks like the class you want to load is broken. Can you send more information what app server do you use, which jre use this app server, and which java compiler do you use and the exact line were the exception trows.

Aglets-java.lang.UnsupportedClassVersionError:Unsupported major.minor versi

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import com.ibm.aglet.*;
public class CreatedAglet extends Aglet
public void onCreation(Object init)
System.out.println("createdAglet agent created");
public void run()
System.out.println("createdAglet running");
import com.ibm.aglet.*;
public class CreatingAglet extends Aglet
public void onCreation(Object init)
System.out.println("Agent Created");
public void run()
try
AgletContext context = this.getAgletContext();
context.createAglet(null,"CreatedAglet",null);
catch(Exception e)
System.out.println("Exception " + e);
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Microsoft Windows XP [Version 5.1.2600]
java.lang.UnsupportedClassVersionError: CreatingAglet (Unsupported major.minor v
ersion 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at com.ibm.aglets.tahiti.AgletClassLoader.loadClassFromCodeBase(Unknown
Source)
at com.ibm.aglets.tahiti.AgletClassLoader.findClassInternal(Unknown Sour
ce)
at com.ibm.aglets.tahiti.AgletClassLoader.loadClass(Unknown Source)
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at com.ibm.aglets.tahiti.ResourceManagerImpl.loadClass(Unknown Source)
at com.ibm.aglets.AgletContextImpl.createAglet(Unknown Source)
at com.ibm.aglets.AgletContextImpl.createAglet(Unknown Source)
at com.ibm.aglets.tahiti.MainWindow$TahitiEventHandler.perform(Unknown S
ource)
at com.ibm.aglets.tahiti.MainWindow$TahitiEventHandler.run(Unknown Sourc
e)
at java.lang.Thread.run(Thread.java:534)
When loading CreatingAglet from atp://system:4434/ : java.lang.UnsupportedClassV
ersionErrorCreatingAglet (Unsupported major.minor version 50.0)
java.lang.ClassNotFoundException: When loading CreatingAglet from atp://system:4
434/ : java.lang.UnsupportedClassVersionErrorCreatingAglet (Unsupported major.mi
nor version 50.0)
at com.ibm.aglets.tahiti.AgletClassLoader.loadClassFromCodeBase(Unknown
Source)
at com.ibm.aglets.tahiti.AgletClassLoader.findClassInternal(Unknown Sour
ce)
at com.ibm.aglets.tahiti.AgletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at com.ibm.aglets.tahiti.ResourceManagerImpl.loadClass(Unknown Source)
at com.ibm.aglets.AgletContextImpl.createAglet(Unknown Source)
at com.ibm.aglets.AgletContextImpl.createAglet(Unknown Source)
at com.ibm.aglets.tahiti.MainWindow$TahitiEventHandler.perform(Unknown S
ource)
at com.ibm.aglets.tahiti.MainWindow$TahitiEventHandler.run(Unknown Sourc
e)
at java.lang.Thread.run(Thread.java:534)

The error message says that you have a library that is too new for your JDK/VM.
Kaj

Java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded?

When i run my web-application with the embedded OC4J server, the following error message is prompted:
java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded
     void MyFolder.objects.MyObject.<init>(oracle.jbo.ApplicationModule, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest)
     void MyFolder.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
     void com.evermind.util.ThreadPoolThread.run()
Question:
- What is the cause of this error message? How to avoid?
- I intended to deploy my application to 9IAS server. Will the same problem occurs too?
Thanks for your reply!

Hi Pig,
When i run my web-application with the embedded OC4J server, the following error message is prompted:
java.lang.Exception: ORA-00020: maximum number of processes (150) exceeded
     void MyFolder.objects.MyObject.<init>(oracle.jbo.ApplicationModule, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest)
     void MyFolder.servlet.MyServlet.doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     void javax.servlet.http.HttpServlet.service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.invoke(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
     void com.evermind.server.http.ServletRequestDispatcher.forwardInternal(javax.servlet.ServletRequest, javax.servlet.http.HttpServletResponse)
     boolean com.evermind.server.http.HttpRequestHandler.processRequest(com.evermind.server.ApplicationServerThread, com.evermind.server.http.EvermindHttpServletRequest, com.evermind.server.http.EvermindHttpServletResponse, java.io.InputStream, java.io.OutputStream, boolean)
     void com.evermind.server.http.HttpRequestHandler.run(java.lang.Thread)
     void com.evermind.util.ThreadPoolThread.run()
Question:
- What is the cause of this error message? How to avoid?.
From the Oracle error message documentation:
ORA-00020 maximum number of processes (string) exceeded
Cause: All process state objects are in use.
Action: Increase the value of the PROCESSES initialization parameter.
Another alternative approach may be to configure your Connection pool and/or your ApplicationModule pool to optimize the use of
database connections and/or restrict the number of database connections used by the application. For example, if your application
has declared many root ApplicationModules (i.e. more than one ApplicationModule pool is in use) then it may help to enable the
jbo.doconnectionpooling switch so that each ApplicationModule instance in the pools does not maintain a dedicated database
connection while not in use. Another alternative if you are using the BC4J connection pool (not a JDBC datasource) may be to
restrict the number of connections the pool can create to < 150 with the jbo.maxpoolsize switch. However, please note that this
may have an impact on throughput.
- I intended to deploy my application to 9IAS server. Will the same problem occurs too?.
This is a database issue. So, yes.
Hope this helps.
JR

Java.lang.ClassFormatError: Bad major version number

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