[jira] [Created] (ZOOKEEPER-3291) improve error message when JAVA_HOME is set to the wrong value

["Mogens Heller Grabe (JIRA)" <ji...@apache.org>]

Mogens Heller Grabe created ZOOKEEPER-3291:
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             Summary: improve error message when JAVA_HOME is set to the wrong value
                 Key: ZOOKEEPER-3291
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3291
             Project: ZooKeeper
          Issue Type: Improvement
          Components: scripts
    Affects Versions: 3.4.12
         Environment: Windows
            Reporter: Mogens Heller Grabe


This is small (Windows-based) developer usability improvement.

When the {{JAVA_HOME}} environment variable is set, but the value is wrong (so that {{JAVA_HOME}} + {{/bin/java.exe}} does not point correctly to {{java.exe}}), the startup script will simply fail with the message

{{Error: JAVA_HOME is incorrectly set.}}

which is a bummer. 😞

With this tiny change, the error message will be much friendlier:

{{Error: JAVA_HOME is incorrectly set: C:\Program Files\Java\jre1.8.0_201\bin}}
{{Expected to find java.exe here: C:\Program Files\Java\jre1.8.0_201\bin\bin\java.exe}}

(in this case showing a situation where one has inadvertently included {{/bin}} in the {{JAVA_HOME}} environment variable).

This will also give a nicer error message in situations, where the JRE has been updated, and the one pointed to by {{JAVA_HOME}} has been uninstalled.



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