Index: src/org/netbeans/modules/apisupport/project/queries/SourceForBinaryImpl.java
===================================================================
RCS file: /cvs/apisupport/project/src/org/netbeans/modules/apisupport/project/queries/SourceForBinaryImpl.java,v
retrieving revision 1.8
diff -u -r1.8 SourceForBinaryImpl.java
--- src/org/netbeans/modules/apisupport/project/queries/SourceForBinaryImpl.java	31 Oct 2006 23:34:27 -0000	1.8
+++ src/org/netbeans/modules/apisupport/project/queries/SourceForBinaryImpl.java	15 May 2007 16:20:42 -0000
@@ -26,6 +26,8 @@
 import java.util.Map;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 import javax.swing.event.ChangeListener;
 import org.netbeans.api.java.queries.SourceForBinaryQuery;
 import org.netbeans.modules.apisupport.project.NbModuleProject;
@@ -122,7 +124,11 @@
     
     private String getModuleJarClusterPath() {
         if (clusterPath == null) { // XXX should listen to changes on cluster property?
-            File cluster = project.getHelper().resolveFile(project.evaluator().evaluate("${cluster}")); // NOI18N
+            String evaluatedCluster = project.evaluator().evaluate("${cluster}");
+            if ("${cluster}".equals(evaluatedCluster)) {
+                Logger.getLogger(SourceForBinaryImpl.class.getName()).log(Level.WARNING, "Cannot resolve cluster for {0}.", project.getCodeNameBase());
+            }
+            File cluster = project.getHelper().resolveFile(evaluatedCluster); // NOI18N
             clusterPath = PropertyUtils.relativizeFile(cluster.getParentFile(), 
                    project.getModuleJarLocation()).replace('/', File.separatorChar);
         }