try this version instead...

diff --git a/org.aspectj.ajdt.core/src/org/aspectj/ajdt/internal/core/builder/AjState.java b/org.aspectj.ajdt.core/src/org/aspectj/ajdt/internal/core/builder/AjState.java
index 6a7b7dabb146162d9102c70699e6225808531c4f..4e9c5552e2a138ce1a208779fab2397d7a6abf11 100644 (file)
--- a/org.aspectj.ajdt.core/src/org/aspectj/ajdt/internal/core/builder/AjState.java
+++ b/org.aspectj.ajdt.core/src/org/aspectj/ajdt/internal/core/builder/AjState.java
@@ -265,7 +265,11 @@ public class AjState {
        private boolean changed(List oldPath, List newPath, boolean checkClassFiles, File oldOutputLocation) {
                if (oldPath == null) oldPath = new ArrayList();
                if (newPath == null) newPath = new ArrayList();
-               try {oldOutputLocation = oldOutputLocation.getCanonicalFile();} catch(IOException ex) { /* we did our best...*/ }
+               try {
+                       if (oldOutputLocation != null) {
+                               oldOutputLocation = oldOutputLocation.getCanonicalFile();
+                       }
+               } catch(IOException ex) { /* we did our best...*/ }
                if (oldPath.size() != newPath.size()) {
                        return true;
                }