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I want to upgrade my jdk on a CentOS server, after some simple searches I found some solutions.

From this link, you can see that the instructions are simple.

  • install your chosen jdk from rpm package or from source

  • possibly choose some alternatives

  • check that the new version installed (java -version)

The first two steps above, I easily completed, but in check version step I get this error:

Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

I have also checked:

alternatives --config java

and symbolic links.

I have also tried which command to find out what java is actually running and this was the link directions.

/usr/bin/java -> /etc/alternatives/java -> /usr/java/jdk-1.8.0_40/bin/java

the weird thing is that when I run:

/usr/bin/java -version

It is OK and it returns the version but when I run java without any prefix I got that error.

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The problem was a system variable CLASSPATH.

and it must be exported in some way for example /etc/bashrc file because jdk needs to know the pass of classes and libraries to load it's modules.

in my case i sat CLASSPATH=/usr/java/jdk1.8.0_40/lib.

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