How to upgrade Java compiler

Question

Today I've started to get this warning in the console, when I try to compile my programs with javac:

warning: Blabla.class: major version 52 is newer than 51, the highest major version supported by this compiler.

it is recommended that the compiler be upgraded.

But how can I do that?

PS. command javac -version returns 1.7.0_85, while java -version returns 1.8.0_66. I do not know how this mixture has happened.

Try this command and check, if you can change the active javac version sudo update-alternatives --config javac — A.B., Nov 12 '15 at 06:33

score 5 · Accepted Answer · edited Nov 12 '15 at 08:27

5

You have more than one Java version installed and you are using different versions for java and javac. javac -version returns 1.7.0_85, while java -version returns 1.8.0_66. This means that javaccreates bytecode for Java 7 and you try to compile a version for Java 8.

Execute

sudo update-alternatives --config javac

and select Java 8 to solve your problem.

edited Nov 12 '15 at 08:27

cl-netbox

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answered Nov 12 '15 at 07:32

A.B.

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It was giving me an error that I had no alternative javac available. I was able to solve the issue by following the marked answer of this question. – Sufian Mar 29 '21 at 11:58

How to upgrade Java compiler

1 Answers1