classpath too long problem
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Key: MEXEC-68
URL: http://jira.codehaus.org/browse/MEXEC-68
Project: Maven 2.x Exec Plugin
Issue Type: Bug
Components: exec
Affects Versions: 1.1.1
Environment: windows xp, java 1.6
Reporter: Mathias Arens
Attachments: exec-maven-plugin-long-classpath.patch
If you try to run a project main class with a long list of dependencies the
classpath grows larger than windows can handle on its command line. The maven
exec plugin simply fails when the classpath is getting to large.
The surefire plugin solves this issue by putting the classpath and the main
class into a Manifest.mf file and wrapping it into a jar. I copied the
createJar() routine from the ForkConfiguration class from the surefire-booter
module to the ExecMojo plus two additional classes.
I introduced a new attribute to the ExecMojo called longClasspath that can be
set from the command line with -Dexec.longClasspath=true. If this flag is set
to true a temporary jar file is created and executed. The command line
arguments '-classpath %classpath mainClass' are replaced by '-jar
maven-exec.jar' whilst the jar contains the main class and the classpath.
I added a patch with my current implementation of the ExecMojo class based on
revision 9948. The patch works perfectly fine even with maven modules that have
long classpaths and where main classes cannot be executed with the current
exec-plugin. But in the implementation I made several assumptions on the
ordering of the command line arguments. I don't know all the assumptions are
valid. At least the patch is a good starting point for a fix of this issue.
Maybe the default value of the longClasspath attribute should be set to true in
further releases because this is the default in the surefire plugin as well.
And maybe somebody has a better attribute name for the longClasspath attribute.
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