JAVA_COMPILER environment variable

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