[GitHub] [openwhisk-runtime-java] sciabarra commented on issue #82: Add OpenJDK 11 action loop runtime

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sciabarra commented on issue #82: Add OpenJDK 11 action loop runtime
URL: https://github.com/apache/openwhisk-runtime-java/pull/82#issuecomment-605431367
 
 
   The actionloop cannot set the environment variables for the activation, it can set the environment variables BEFORE the process start but it cannot change environment variables of a launched process. No program can do this, there is in Unix an exec call where you can pass an environment variables array. It is the task of a the launched program to set environment variables. Indeed all the "action loops" does exactly this: read the action and sets the environment variables. This is easy in every language except java, where it has been decided you cannot do this. And the only way is the ugly hack of marking an in-memory variabile read-only as writable and write it. I proposed to remove this hack and instead accept that the activation values are passed as system properties. This requires to change and document the difference. Or use the unsafe code... 

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