java error at start

[marco69]

Hi all.

Giving the command
~$ java -jar ./josm-tested.jar

I get this error:

Exception in thread "main" java.lang.ClassFormatError: JOSM (unrecognized class file version)

at java.lang.VMClassLoader.defineClass(libgcj.so.16)
at java.lang.ClassLoader.defineClass(libgcj.so.16)
at java.security.SecureClassLoader.defineClass(libgcj.so.16)
at java.net.URLClassLoader.findClass(libgcj.so.16)
at java.lang.ClassLoader.loadClass(libgcj.so.16)
at java.lang.ClassLoader.loadClass(libgcj.so.16)
at gnu.java.lang.MainThread.run(libgcj.so.16)

~$ java -version
java version "1.5.0"
gij (GNU libgcj) version 5.3.0

[skyper]

You are using a very old java version. In order to run JOSM you need java 8 (1.8) or higher.

[marco69]

Thanks, but I must be missing something.

I've installed this file:
​http://download.oracle.com/otn-pub/java/jdk/8u102-b14/jdk-8u102-linux-x64.tar.gz
downloaded from this page:
​http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

I still have

~$ java -version
java version "1.5.0"
gij (GNU libgcj) version 5.3.0

Where is a more recent jdk to be found?

[Don-vip]

you must uninstall your prehistoric version, see ​http://stackoverflow.com/a/14211717/2257172

[marco69]

Thank you! I removed a package called gcc-java an now everything works fine:

~$ java -version
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)