If you import the Weld Java EE 6 example, you will face the following exception:

!ENTRY org.hibernate.eclipse.console 4 4 2011-02-20 22:54:41.156
!MESSAGE Could not activate Hibernate nature on projectjboss-javaee6-webapp
!SUBENTRY 1 org.hibernate.eclipse.console 4 150 2011-02-20 22:54:41.156
!MESSAGE org.eclipse.core.runtime.CoreException: Problems encountered while setting project description.
!STACK 1
org.eclipse.core.runtime.CoreException: Problems encountered while setting project description.
at org.eclipse.core.internal.resources.Project.setDescription(Project.java:1212)
at org.eclipse.core.internal.resources.Project.setDescription(Project.java:1238)
at org.hibernate.eclipse.console.utils.ProjectUtils.addProjectNature(ProjectUtils.java:133)
at org.hibernate.eclipse.console.utils.ProjectUtils.toggleHibernateOnProject(ProjectUtils.java:104)
at org.jboss.tools.maven.hibernate.configurators.HibernateProjectConfigurator.configureInternal(HibernateProjectConfigurator.java:55)
at org.jboss.tools.maven.hibernate.configurators.HibernateProjectConfigurator.mavenProjectChanged(HibernateProjectConfigurator.java:67)
at org.maven.ide.eclipse.internal.project.ProjectConfigurationManager.mavenProjectChanged(ProjectConfigurationManager.java:646)
at org.maven.ide.eclipse.internal.project.registry.ProjectRegistryManager.notifyProjectChangeListeners(ProjectRegistryManager.java:636)
at org.maven.ide.eclipse.internal.project.registry.ProjectRegistryManager.applyMutableProjectRegistry(ProjectRegistryManager.java:767)
at org.maven.ide.eclipse.internal.project.registry.ProjectRegistryManager.refresh(ProjectRegistryManager.java:346)
at org.maven.ide.eclipse.project.MavenProjectManager.refresh(MavenProjectManager.java:65)
at org.maven.ide.eclipse.internal.project.ProjectConfigurationManager.configureNewMavenProject(ProjectConfigurationManager.java:209)
at org.maven.ide.eclipse.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:146)
at org.maven.ide.eclipse.internal.project.ProjectConfigurationManager.createArchetypeProject(ProjectConfigurationManager.java:481)
at org.jboss.tools.maven.project.examples.wizard.ArchetypeExamplesWizard$1.run(ArchetypeExamplesWizard.java:73)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1975)
at org.jboss.tools.maven.project.examples.wizard.ArchetypeExamplesWizard$2.run(ArchetypeExamplesWizard.java:85)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)