[jira] (MCHECKSTYLE-207) file handle leak - leading to failed builds

["James Nord (JIRA)" <ji...@codehaus.org>]

James Nord created MCHECKSTYLE-207:
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             Summary: file handle leak - leading to failed builds
                 Key: MCHECKSTYLE-207
                 URL: https://jira.codehaus.org/browse/MCHECKSTYLE-207
             Project: Maven Checkstyle Plugin
          Issue Type: Bug
         Environment: Linux
            Reporter: James Nord


The plugin sets the classpath to load as a URLClassloader populated with all the URLs to the projects dependencies (jars) and output folders.

However the URLClassloader is never closed (only available in JDK1.7+) and for a large multi-module project with a large number of dependencies this leak can seriously add up (which if gc doesn't kick in at the right moment) will lead to random failures due to java.io.IOException: error=24, Too many open files.

see http://svn.apache.org/viewvc/maven/plugins/tags/maven-checkstyle-plugin-2.11/src/main/java/org/apache/maven/plugin/checkstyle/DefaultCheckstyleExecutor.java?revision=1540890&view=markup

Line 162 where the URLClassloader is created - but never cleaned up.

The fix is relatively trivial if it is only to be fixed for 1.7+ JVMs (and use reflection if need to be compatable with < 1.7).

Otherwise a custom classloader will be needed.

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