Is JAVA_HOME fixed when executing a java command or can it be modified midcommand?

Question

Just to be clear, I DON'T WANT to change the JAVA_HOME during a java command (and take this change into account for said command), but I'm facing a situation where several java commands can be run simultaneously from some ksh scripts, and in those scripts JAVA_HOME is set (and exported) to either a 32-bits or 64-bits version before executing the java command itself.

So I am concerned there could be some "clashes" of some sort... Any advice on how to avoid any "overlaps", if they are even possible?

Note: there can potentially be a lot of script executions at the same time, and >the commands run with 32-bits version of Java cannot be run with 64-bits >version of Java for compatibility issues with other-party processes

Thanks in advance

Java makes no use of JAVA_HOME. It is used by some IDEs, Tomcat, etc. Java provides no way of changing environment variables. An environment variable change in the parent process isn't visible from a child process. Unclear what you're asking. — user207421
– user207421, Commented Feb 21, 2018 at 17:30

Gal Nitzan · Accepted Answer · 2018-02-21 17:26:19Z

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JAVA_HOME is just a convention and it has no effect on the running JVM.

You can set the JAVA_HOME safely for each script, however do not use export! or you might end up with unexpected results.

Also, usually, the java application is located at JAVA_HOME/bin so you need to make sure that your script is pointing to the correct JVM 32/64. HTH, Gal.

answered Feb 21, 2018 at 17:26

Gal Nitzan

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Brian McCutchon · Accepted Answer · 2018-02-21 17:30:49Z

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Like all environment variables, it's fixed at the start of the command. See, for example, this question (it's about a Python program, but the same concept applies).

However, as others have pointed out, it doesn't actually have any effect on Java commands.

answered Feb 21, 2018 at 17:30

Brian McCutchon

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