[GitHub] [druid] FrankChen021 commented on issue #12374: java needs to be available in PATH for Druid to run properly.

[GitBox <gi...@apache.org>]

FrankChen021 commented on issue #12374:
URL: https://github.com/apache/druid/issues/12374#issuecomment-1081332883


   Druid finds JRE in following order: `DRUID_JAVA_HOME`, `JAVA_HOME`, `PATH`. The tutorial/index.md doc only mentions about the first two.
   
   >  Druid relies on the environment variables `JAVA_HOME` or `DRUID_JAVA_HOME` to find Java on the machine. You can set
   `DRUID_JAVA_HOME` if there is more than one instance of Java. To verify Java requirements for your environment, run the 
   `bin/verify-java` script.
   
   And from the exception message you gave above, it seems like that Druid does not indicate that the JRE is under  DRUID_JAVA_HOME when forking a task process.
   
   Both the code and doc can be improved.


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