STEP: Create Dynamic Web Project with JAX-RS Support STEP: Create RestService @Path( "/" ) public class RestService { @POST public void post(@BeanParam BeanClass bean) { } } STEP: Create BeanClass public class BeanClass { @PathParam( "id" ) private Integer id; } STEP: Remove @PathParam("id") and save the file FAIL: There is an error in Error log null org.jboss.tools.common.validation.JBTValidationException at org.jboss.tools.common.validation.ValidatorManager.validate(ValidatorManager.java:123) at org.jboss.tools.common.validation.ValidatorManager.validateInJob(ValidatorManager.java:81) at org.eclipse.wst.validation.internal.operations.ValidatorJob.run(ValidatorJob.java:78) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.lang.NullPointerException at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsResourceMethodValidatorDelegate.validateNoUnboundPathAnnotationTemplateParameters(JaxrsResourceMethodValidatorDelegate.java:278) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsResourceMethodValidatorDelegate.internalValidate(JaxrsResourceMethodValidatorDelegate.java:93) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsResourceMethodValidatorDelegate.internalValidate(JaxrsResourceMethodValidatorDelegate.java:1) at org.jboss.tools.ws.jaxrs.ui.internal.validation.AbstractJaxrsElementValidatorDelegate.validate(AbstractJaxrsElementValidatorDelegate.java:81) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsResourceValidatorDelegate.internalValidate(JaxrsResourceValidatorDelegate.java:65) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsResourceValidatorDelegate.internalValidate(JaxrsResourceValidatorDelegate.java:1) at org.jboss.tools.ws.jaxrs.ui.internal.validation.AbstractJaxrsElementValidatorDelegate.validate(AbstractJaxrsElementValidatorDelegate.java:81) at org.jboss.tools.ws.jaxrs.ui.internal.validation.AbstractJaxrsElementValidatorDelegate.validate(AbstractJaxrsElementValidatorDelegate.java:61) at org.jboss.tools.ws.jaxrs.ui.internal.validation.AbstractJaxrsElementValidatorDelegate.validate(AbstractJaxrsElementValidatorDelegate.java:1) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsMetamodelValidator.validate(JaxrsMetamodelValidator.java:494) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsMetamodelValidator.validate(JaxrsMetamodelValidator.java:382) at org.jboss.tools.ws.jaxrs.ui.internal.validation.JaxrsMetamodelValidator.validate(JaxrsMetamodelValidator.java:160) at org.jboss.tools.common.validation.ValidatorManager.validate(ValidatorManager.java:118) ... 3 more