Enable Maven in project causes ClassCastException
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Key: MNGECLIPSE-25
URL: http://jira.codehaus.org/browse/MNGECLIPSE-25
Project: Maven 2.x Plug-in for Eclipse
Type: Bug
Environment: WIN2K, Eclipse 3.1, JDK 1.5
Reporter: Roland Klein
Assigned to: Eugene Kuleshov
Hello,
i encounter some problem with the eclipse plugin, when i enable Maven2 for a
particular project.
In the eclipse log are three entries and one of them says that there is a
ClassCastException in Maven2Builder.java line 52
52: Maven2ClasspathContainer container = ( Maven2ClasspathContainer )
JavaCore.getClasspathContainer( path, project );
sometimes i got a NPE in the same class line 54, then the variable container is
not initialized.
54: JavaCore.setClasspathContainer( container.getPath(), new IJavaProject[] {
project }, new IClasspathContainer[] { new Maven2ClasspathContainer( entries )
}, monitor );
After debugging i can say that the method JavaCore.getClasspathContainer()
returns a JavaModelManager when you just started eclipse and causes the
ClassCastExceptions, but I don't know if we can ignore it.
I tried to fix this problem, but i don't know the eclipse API very well. So i
post it here in the hope someone can use and improve it.
Then i encounter a problem with MavenEmbedder and i changed the
maven-embedder-2.0-beta-4-SNAPSHOT-dep.jar to maven-embedder-2.0.1-dep.jar and
rebuild the plugin.
This problem occurs, everytime i change the pom.xml by hand then the project
rebuilds but MavenEmbedder is still running and claims there is a duplicate
projectId in pom.xml. Then i inserted in
Maven2Plugin.resolveClasspathEntries() a call to resetMavenEmbedder() before it
is got through getMavenEmbedder(), this fixes the problem, but i thing this is
shooting with canons on birds. Maybe there is a possibility to reset
MavenEmbedder without to instantiate a new one.
<codesnippet Maven2Builder.build()>
// line 52-55 are replaced
// Maven2ClasspathContainer container = ( Maven2ClasspathContainer )
JavaCore
// .getClasspathContainer( path, project );
// JavaCore.setClasspathContainer( container.getPath(), new
IJavaProject[] { project },
// new IClasspathContainer[] { new Maven2ClasspathContainer( entries
) }, monitor );
// ############### CHANGES ################
IClasspathContainer icContainer = JavaCore.getClasspathContainer( path,
project );
IJavaProject[] projects = new IJavaProject[] { project };
IPath newPath = null;
IClasspathContainer[] classpathContainers = null;
if( icContainer == null ) {
newPath = new Path( Maven2Plugin.CONTAINER_ID );
classpathContainers = new IClasspathContainer[] { new
Maven2ClasspathContainer( entries ) };
JavaCore.setClasspathContainer( newPath, projects,
classpathContainers, monitor );
} else {
newPath = icContainer.getPath();
if( icContainer instanceof Maven2ClasspathContainer ) {
classpathContainers = new IClasspathContainer[] { new
Maven2ClasspathContainer( entries ) };
JavaCore.setClasspathContainer( newPath, projects,
classpathContainers, monitor );
} else {
newPath = new Path( Maven2Plugin.CONTAINER_ID );
classpathContainers = new IClasspathContainer[] { new
Maven2ClasspathContainer( entries ) };
JavaCore.setClasspathContainer( newPath, projects,
classpathContainers, monitor );
}
}
// ############### CHANGES ################
</codesnippet>
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