Index: core/bootstrap/src/org/netbeans/ProxyClassLoader.java
===================================================================
RCS file: /cvs/core/bootstrap/src/org/netbeans/ProxyClassLoader.java,v
retrieving revision 1.16
diff -u -r1.16 ProxyClassLoader.java
--- core/bootstrap/src/org/netbeans/ProxyClassLoader.java	4 Jun 2005 05:10:51 -0000	1.16
+++ core/bootstrap/src/org/netbeans/ProxyClassLoader.java	7 Jun 2005 16:40:32 -0000
@@ -330,7 +330,11 @@
      */
     protected Package getPackageFast(String name, String sname, boolean recurse) {
         synchronized (packages) {
-            Package pkg = (Package)packages.get(name);
+            Object obj = packages.get(name);
+            if (obj == JUST_DEFINING_PACKAGE) {
+                return null;
+            }
+            Package pkg = (Package)obj;
             if (pkg != null) {
                 return pkg;
             }
@@ -359,6 +363,9 @@
         }
     }
 
+    /** this is not value you want to find */
+    private static Object JUST_DEFINING_PACKAGE = new Object();
+    
     /** This is here just for locking serialization purposes.
      * Delegates to super.definePackage with proper locking.
      * Also tracks the package in our private cache, since
@@ -369,6 +376,7 @@
 		String implVersion, String implVendor, URL sealBase )
 		throws IllegalArgumentException {
 	synchronized (packages) {
+            packages.put(name, JUST_DEFINING_PACKAGE);
             Package pkg = super.definePackage (name, specTitle, specVersion, specVendor, implTitle,
 			implVersion, implVendor, sealBase);
             packages.put(name, pkg);