Exception in thread "main" java.lang.UnsupportedClassVersionError

Eslam_Elbyaly

Hi. I've JDK 12.0.1 x64. Windows 7 64bit, and Java 8 Update 261 (64-bit).

It's been months since I ran ORDS 20.2.1.227.0350 which was already installed. And when I tried to run it today, I faced this error...

Exception in thread "main" java.lang.UnsupportedClassVersionError: oracle/dbtools/jarcl/Entrypoint (Unsupported major.minor version 52.0)

 at java.lang.ClassLoader.defineClass0(Native Method)

 at java.lang.ClassLoader.defineClass(ClassLoader.java:539)

 at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)

 at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)

 at java.net.URLClassLoader.access$100(URLClassLoader.java:55)

 at java.net.URLClassLoader$1.run(URLClassLoader.java:194)

 at java.security.AccessController.doPrivileged(Native Method)

 at java.net.URLClassLoader.findClass(URLClassLoader.java:187)

 at java.lang.ClassLoader.loadClass(ClassLoader.java:289)

 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)

 at java.lang.ClassLoader.loadClass(ClassLoader.java:235)

 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)

Eslam_Elbyaly

I updated the JRE and it worked.

kdario

You have two different java versions so ORDS is pointing to wrong one.

Check environment variables (PATH and JAVA_HOME).

Also check what shows command: java -version

Eslam_Elbyaly

I updated the JRE and it worked.