Ant + Weblogic + EJb on Eclipse - UnsupportedClassVersionError

[Akhilesh Trivedi]

I am on WebLogic 10.0

My JAVA_HOME is set to JDK 1.4

The same I have configured for the project properties -->java Compiler -->JDK Compliance

I am compiling an EJB on ant script.

Ant is also configured to run on Excution JRE as 1.4.

And it gives me following error.

.
.
     [java] java.lang.UnsupportedClassVersionError: weblogic/utils/compiler/Tool (Unsupported major.minor version 49.0)
     [java] 	at java.lang.ClassLoader.defineClass0(Native Method)
     [java] 	at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
     [java] 	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     [java] 	at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
     [java] 	at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
     [java] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
     [java] 	at java.security.AccessController.doPrivileged(Native Method)
     [java] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
     [java] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     [java] 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
     [java] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     [java] 	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     [java] 	at java.lang.ClassLoader.defineClass0(Native Method)
     [java] 	at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
     [java] 	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     [java] 	at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
     [java] 	at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
     [java] 	at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
     [java] 	at java.security.AccessController.doPrivileged(Native Method)
     [java] 	at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
     [java] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
     [java] 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
     [java] 	at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
     [java] 	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
     [java] 	at weblogic.appc.main(appc.java:14)
     [java] Exception in thread "main" 
     [java] Java Result: 1

Problem is at the line:

	<java classname="weblogic.appc" fork="yes">

Whats wrong? I have tried switching between versions, and at a point I got a jar out! but when I deployed it, I ended up with an error on the server.

[German Gonzalez-Morris]

java.lang.UnsupportedClassVersionError: weblogic/utils/compiler/Tool (Unsupported major.minor version 49.0)
is when you are using diff JDK version.

for WLS 10.0 you need to use JDK 1.5 and not 1.4

[anandraj tadkal]

Change the JAVA_HOME to the JDK 1.5

Cheers,
Anandraj