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Date: Tue, 7 Feb 2017 10:58:41 +0000 (UTC)
From: "ANDREY GRIGORYEV (JIRA)" <jira@apache.org>
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Subject: [jira] [Created] (GROOVY-8076) A more helpful error message should
 be logged when a custom Java class cannot be resolved by the Groovy
 component due to a Java major/minor version mismatch
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archived-at: Tue, 07 Feb 2017 10:58:45 -0000

ANDREY GRIGORYEV created GROOVY-8076:
----------------------------------------

             Summary: A more helpful error message should be logged when a custom Java class cannot be resolved by the Groovy component due to a Java major/minor version mismatch
                 Key: GROOVY-8076
                 URL: https://issues.apache.org/jira/browse/GROOVY-8076
             Project: Groovy
          Issue Type: Bug
          Components: groovy-runtime
            Reporter: ANDREY GRIGORYEV


I spent a couple of hours investigating why my application would no longer successfully deploy to the mule standalone ESB server, yet it would deploy fine to the embedded mule ESB runtime in Anypoint Studio. The error message that I found in the server log was something along the lines of the following:
"... Script1.groovy: 1: unable to resolve class com.mycompany.MyReallyUsefulCustomClass ..."
I went down all the wrong avenues trying to figure out why the Java class was not being resolved by the Groovy interpreter.
Eventually I stumbled upon an explanation of the problem via a Google search: a Java major/minor version mismatch between the version of the Java runtime being used by the Mule ESB runtime and the Java target version of the compiled custom Java classes used by a Mule application being deployed to the Mule ESB server.
The cause of my problem was indeed due to a Java version mismatch: the ESB server runtime was running JRE 1.7, but the custom class being referenced by the embedded Groovy script was compiled in Anypoint Studio using JDK 1.8.
I would like to formally submit an Enhancement Request for Engineering to improve the customer experience for us developers; possibly by updating the Groovy interpreter component to detect the conflicting Java version issues and log a more helpful error message to the logger.
The current message "... unable to resolve class ..." is too general and does not adequately reflect the problem of a mismatch between the JRE version and the compiled byte-code version.
An "Unsupported major.minor version x.yy" error message instead would be an improvement.


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