Seam2.3 NPE in Interpolator.interpolate if pages.xml exception http-error no message set ---------------------------------------------------------------------------------------- Key: JBSEAM-5080 URL: https://issues.jboss.org/browse/JBSEAM-5080 Project: Seam 2 Issue Type: Bug Affects Versions: 2.3.0.Final Reporter: Marek Schmidt Assignee: Marek Novotny Fix For: 2.3.1.CR1 Having a exception handler with no message, e.g. <exception class="org.jboss.seam.example.tasks.ResourceNotFoundException" log-level="debug"> <http-error error-code="404"/> </exception> in pages.xml will cause an HTTP error 500 instead with a NPE exception: java.lang.NullPointerException org.jboss.seam.core.Interpolator.interpolate(Interpolator.java:64) org.jboss.seam.faces.Navigator.getDisplayMessage(Navigator.java:87) org.jboss.seam.exception.ErrorHandler.handle(ErrorHandler.java:27) org.jboss.seam.exception.Exceptions.handle(Exceptions.java:76) org.jboss.seam.web.ExceptionFilter.endWebRequestAfterException(ExceptionFilter.java:114) org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:70) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) Actual results: Error 500 with NPE Expected results: Error 404 with an empty or some default message should appear.