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Posted to dev@maven.apache.org by "Eugene Kuleshov (JIRA)" <ji...@codehaus.org> on 2006/01/12 21:03:02 UTC
[jira] Reopened: (MNGECLIPSE-25) Enable Maven in project causes
ClassCastException
[ http://jira.codehaus.org/browse/MNGECLIPSE-25?page=all ]
Eugene Kuleshov reopened MNGECLIPSE-25:
---------------------------------------
> Enable Maven in project causes ClassCastException
> -------------------------------------------------
>
> Key: MNGECLIPSE-25
> URL: http://jira.codehaus.org/browse/MNGECLIPSE-25
> Project: Maven 2.x Plug-in for Eclipse
> Type: Bug
> Versions: 0.0.3
> Environment: WIN2K, Eclipse 3.1, JDK 1.5
> Reporter: Roland Klein
> Assignee: Eugene Kuleshov
> Fix For: 0.0.4
> Attachments: pzFileReader.zip, src.zip
>
>
> 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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