[ http://jira.codehaus.org/browse/MEXEC-9?page=all ]
Jerome Lacoste closed MEXEC-9.
------------------------------
Resolution: Fixed
Fixed as part of MEXEC-14
> PATCH: IsolatedClassLoader is not actually isolated
> ---------------------------------------------------
>
> Key: MEXEC-9
> URL: http://jira.codehaus.org/browse/MEXEC-9
> Project: Mojo Exec Plugin
> Issue Type: Bug
> Affects Versions: 1.0.1, 1.0.2
> Reporter: Matt Whitlock
> Assigned To: Jerome Lacoste
> Priority: Critical
> Fix For: 1.1
>
> Attachments: exec-maven-plugin.patch
>
>
> The IsolatedClassLoader defined in ExecJavaMojo breaks applications. An
> example demonstrating this breakage is an application that uses the
> XMLDecoder class of the J2SE, and whose project includes a dependency on a
> newer version of xml-apis than included in the JRE.
> Expected Results:
> The exec:java goal should use a classloader that first attempts to locate
> classes in the dependency artifacts of the project, and then delegates to the
> system class loader if unsuccessful. This is analogous to starting a Java
> app with the command line "java -cp dep1.jar:dep2.jar:... MainClass". This
> is the behavior that is intuitively expected of the exec:java goal.
> Actual Results:
> The exec:java goal uses a locally defined (and not completely implemented)
> IsolatedClassLoader that first searches the dependencies of the project and
> then delegates to the classloader that loaded the mojo. This behavior adds
> undesired delegation to the classloader used to start the application, which
> causes class and resource conflicts.
> Proposed Solution:
> Simply load the main class of the application using a URLClassLoader
> configured to search the project's dependencies and fall back on the system
> class loader. This proposed solution is implemented by the attached patch.
> Known Issues:
> The solution breaks the ExecJavaMojoTest unit test because that test case
> attempts to load a main class (DummyMain) that is defined inside the
> exec-maven-plugin, which is not actually a dependency of the mock Maven
> project that the test sets up.
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