JAVA_COMPILER environment variable

You can set the JAVA_COMPILER environment variable in the Java™ virtual machine environment to disable JIT compilation.

>>-setenv--JAVA_COMPILER--+-none-+-----------------------------><
                          '-NONE-'   

The NONE and none settings are equivalent. On UNIX systems that support the C shell and on which JAVA_COMPILER has been set to NONE or none, you can enable the JIT compiler for the JVM environment by the following command:

unset JAVA_COMPILER