NPE while validating JAX-RS content

Stacktrace:

!ENTRY org.jboss.tools.common 4 0 2012-11-05 14:28:36.321
!MESSAGE
!STACK 0
org.jboss.tools.common.validation.JBTValidationException
at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:101)
at org.eclipse.wst.validation.internal.operations.ValidatorJob.run(ValidatorJob.java:78)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)
Caused by: java.lang.NullPointerException
at org.jboss.tools.ws.jaxrs.core.internal.metamodel.builder.JaxrsElementChangedPublisher.publish(JaxrsElementChangedPublisher.java:36)
at org.jboss.tools.ws.jaxrs.core.internal.metamodel.validation.JaxrsMetamodelValidator.validate(JaxrsMetamodelValidator.java:125)
at org.jboss.tools.common.validation.ValidatorManager.validate(ValidatorManager.java:117)
at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:81)
... 2 more