After installing istalling JBoss Maven Seam Integration plugin from http://download.jboss.org/jbosstools/updates/development/indigo/ m2e-wtp configurator stopped working. Running Maven > Update Configuration produces to following error on any project that is using war or ejb packaging (ear is OK):

Project configurator "org.jboss.tools.maven.seam.configurator" is not available. To enable full functionality, install the project configurator and run Maven->Update Project Configuration.

Additionally, maven-ejb-plugin and maven-war-plugin executions are reported as not covered by by lifecycle configuration.

I've checked with OSGi host console and org.jboss.tools.maven.seam bundle is deployed:

osgi> ss org.jboss.tools.maven.seam
id State Bundle
774 ACTIVE org.jboss.tools.maven.seam_1.3.0.v20111209-0524-H40-M5

The configurator extension is also deployed:

osgi> pt -v org.eclipse.m2e.core.projectConfigurators
Extension(s):
-------------------
null [from org.jboss.tools.maven.seam]
<configurator>
id = org.jboss.tools.maven.seam.configurator
class = org.jboss.tools.maven.seam.configurators.SeamProjectConfigurator
name = Seam
secondaryTo = org.maven.ide.eclipse.configuration.wtp.configurator
</configurator>

Alas, the configurator class cannot be instantiated. Eclipse error log contains the following:

Plug-in "org.jboss.tools.maven.seam" was unable to instantiate class "org.jboss.tools.maven.seam.configurators.SeamProjectConfigurator".
An exception stack trace is not available.