Yes this is a problem that make using m2eclipse to build multimodule projects in eclipse very painful indeed. Please do fix this, its not a feature, its a bug... m2eclipse should do the following:
4.) otherwise, attempt to run mvn package within the project and create the artifacts.
> Conflict with workspace resoutlion in m2eclipse
> -----------------------------------------------
>
> Key: MWAR-192
> URL:
http://jira.codehaus.org/browse/MWAR-192> Project: Maven 2.x WAR Plugin
> Issue Type: Bug
> Affects Versions: 2.1-alpha-2
> Environment: windows vista
> Reporter: Max Powers
> Attachments: maven-war-plugin.patch
>
>
> While building my webapp in eclipse using a launch configuration (goals clean install) and having 'Resolve Workspace Artifacts' checked, the war plugin cant assemble the war file properly. Note that disabled 'Resolve Workspace Artifacts' and the war is assembled fine
> [DEBUG] Processing: nexus-lvo-plugin-1.3.3-SNAPSHOT.jar
> [INFO] ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO] ------------------------------------------------------------------------
> [INFO] Failed to copy file for artifact[org.sonatype.nexus.plugins:nexus-lvo-plugin:jar:1.3.3-SNAPSHOT:compile]
>
> Embedded error: C:\Development\Code\nexus-1.3.x\nexus-core-plugins\nexus-lvo-plugin\target\classes (Access is denied)
> [INFO] ------------------------------------------------------------------------
> [DEBUG] Trace
> org.apache.maven.lifecycle.LifecycleExecutionException: Failed to copy file for artifact[org.sonatype.nexus.plugins:nexus-lvo-plugin:jar:1.3.3-SNAPSHOT:compile]
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:703)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:540)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:519)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:371)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:332)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:181)
> at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
> at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
> at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:585)
> at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
> at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
> at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
> at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
> Caused by: org.apache.maven.plugin.MojoExecutionException: Failed to copy file for artifact[org.sonatype.nexus.plugins:nexus-lvo-plugin:jar:1.3.3-SNAPSHOT:compile]
> at org.apache.maven.plugin.war.packaging.ArtifactsPackagingTask.performPackaging(ArtifactsPackagingTask.java:125)
> at org.apache.maven.plugin.war.packaging.WarProjectPackagingTask.handleArtifacts(WarProjectPackagingTask.java:183)
> at org.apache.maven.plugin.war.packaging.WarProjectPackagingTask.performPackaging(WarProjectPackagingTask.java:103)
> at org.apache.maven.plugin.war.AbstractWarMojo.buildWebapp(AbstractWarMojo.java:439)
> at org.apache.maven.plugin.war.AbstractWarMojo.buildExplodedWebapp(AbstractWarMojo.java:375)
> at org.apache.maven.plugin.war.WarMojo.performPackaging(WarMojo.java:181)
> at org.apache.maven.plugin.war.WarMojo.execute(WarMojo.java:143)
> at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:483)
> at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:678)
> ... 16 more
> Caused by: java.io.FileNotFoundException: C:\Development\Code\nexus-1.3.x\nexus-core-plugins\nexus-lvo-plugin\target\classes (Access is denied)
> at java.io.FileInputStream.open(Native Method)
> at java.io.FileInputStream.<init>(FileInputStream.java:106)
> at org.codehaus.plexus.util.io.FileInputStreamFacade.getInputStream(FileInputStreamFacade.java:78)
> at org.codehaus.plexus.util.FileUtils.copyStreamToFile(FileUtils.java:1057)
> at org.codehaus.plexus.util.FileUtils.copyFile(FileUtils.java:965)
> at org.apache.maven.plugin.war.packaging.AbstractWarPackagingTask.copyFile(AbstractWarPackagingTask.java:293)
> at org.apache.maven.plugin.war.packaging.AbstractWarPackagingTask$1.registered(AbstractWarPackagingTask.java:150)
> at org.apache.maven.plugin.war.util.WebappStructure.registerFile(WebappStructure.java:176)
> at org.apache.maven.plugin.war.packaging.AbstractWarPackagingTask.copyFile(AbstractWarPackagingTask.java:145)
> at org.apache.maven.plugin.war.packaging.ArtifactsPackagingTask.performPackaging(ArtifactsPackagingTask.java:100)
> ... 24 more