diff -r e2063d266acd j2ee.core.utilities/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiers.java
--- a/j2ee.core.utilities/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiers.java	Thu Nov 27 15:54:35 2008 +0530
+++ b/j2ee.core.utilities/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiers.java	Mon Dec 08 15:20:44 2008 +0530
@@ -73,7 +73,10 @@ public final class JavaIdentifiers {
         if (packageName.startsWith(".") || packageName.endsWith(".")) {// NOI18N
             return false;
         }
-        
+        if(packageName.equals("java") || packageName.startsWith("java.")) {//NOI18N
+            return false;
+        }
+
         String[] tokens = packageName.split("\\."); //NOI18N
         if (tokens.length == 0) {
             return Utilities.isJavaIdentifier(packageName);
diff -r e2063d266acd j2ee.core.utilities/test/unit/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiersTest.java
--- a/j2ee.core.utilities/test/unit/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiersTest.java	Thu Nov 27 15:54:35 2008 +0530
+++ b/j2ee.core.utilities/test/unit/src/org/netbeans/modules/j2ee/core/api/support/java/JavaIdentifiersTest.java	Mon Dec 08 15:20:44 2008 +0530
@@ -66,6 +66,8 @@ public class JavaIdentifiersTest extends
         assertFalse(JavaIdentifiers.isValidPackageName(" "));
         assertFalse(JavaIdentifiers.isValidPackageName("public"));
         assertFalse(JavaIdentifiers.isValidPackageName("int"));
+        assertFalse(JavaIdentifiers.isValidPackageName("java"));
+        assertFalse(JavaIdentifiers.isValidPackageName("java.something"));
     }
 
     public void testUnqualify() {