3 files changed, 42 insertions, 2 deletions

diff --git a/libjava/classpath/java/io/ObjectInputStream.java b/libjava/classpath/java/io/ObjectInputStream.java
index e469609bde0..735d46cd920 100644
--- a/libjava/classpath/java/io/ObjectInputStream.java
+++ b/libjava/classpath/java/io/ObjectInputStream.java
@@ -223,6 +223,15 @@ public class ObjectInputStream extends InputStream
        case TC_PROXYCLASSDESC:
  	{
  	  if(dump) dumpElementln("PROXYCLASS");
+
+/* GCJ LOCAL */
+	  // The grammar at this point is
+	  //   TC_PROXYCLASSDESC newHandle proxyClassDescInfo
+	  // i.e. we have to assign the handle immediately after
+	  // reading the marker.
+ 	  int handle = assignNewHandle("Dummy proxy");
+/* END GCJ LOCAL */
+
  	  int n_intf = this.realInputStream.readInt();
  	  String[] intfs = new String[n_intf];
  	  for (int i = 0; i < n_intf; i++)
@@ -250,7 +259,9 @@ public class ObjectInputStream extends InputStream
                     new InternalError("Object ctor missing").initCause(x);
                 }
             }
- 	  assignNewHandle(osc);
+/* GCJ LOCAL */
+	  rememberHandle(osc,handle);
+/* END GCJ LOCAL */
  	  
  	  if (!is_consumed)
  	    {
diff --git a/libjava/classpath/java/io/ObjectOutputStream.java b/libjava/classpath/java/io/ObjectOutputStream.java
index eac11f78db9..316b9070133 100644
--- a/libjava/classpath/java/io/ObjectOutputStream.java
+++ b/libjava/classpath/java/io/ObjectOutputStream.java
@@ -1211,11 +1211,17 @@ public class ObjectOutputStream extends OutputStream
   }
 
 
+/* GCJ LOCAL */
   // writes out FIELDS of OBJECT for the specified ObjectStreamClass.
-  // FIELDS are already in canonical order.
+  // FIELDS are already supposed already to be in canonical order, but
+  // under some circumstances (to do with Proxies) this isn't the
+  // case, so we call ensureFieldsSet().
   private void writeFields(Object obj, ObjectStreamClass osc)
     throws IOException
   {
+    osc.ensureFieldsSet(osc.forClass());
+/* END GCJ LOCAL */
+
     ObjectStreamField[] fields = osc.fields;
     boolean oldmode = setBlockDataMode(false);
 
diff --git a/libjava/classpath/java/io/ObjectStreamClass.java b/libjava/classpath/java/io/ObjectStreamClass.java
index 52a1ad42873..cc3d0a9e31f 100644
--- a/libjava/classpath/java/io/ObjectStreamClass.java
+++ b/libjava/classpath/java/io/ObjectStreamClass.java
@@ -654,11 +654,29 @@ outer:
       flags |= ObjectStreamConstants.SC_ENUM;
   }
 
+/* GCJ LOCAL */
+  // FIXME: This is a workaround for a fairly obscure bug that happens
+  // when reading a Proxy and then writing it back out again.  The
+  // result is that the ObjectStreamClass doesn't have its fields set,
+  // generating a NullPointerException.  Rather than this kludge we
+  // should probably fix the real bug, but it would require a fairly
+  // radical reorganization to do so.
+  final void ensureFieldsSet(Class cl)
+  {
+    if (! fieldsSet)
+      setFields(cl);
+  }
+/* END GCJ LOCAL */
+
 
   // Sets fields to be a sorted array of the serializable fields of
   // clazz.
   private void setFields(Class cl)
   {
+/* GCJ LOCAL */
+    fieldsSet = true;
+/* END GCJ LOCAL */
+
     SetAccessibleAction setAccessible = new SetAccessibleAction();
 
     if (!isSerializable() || isExternalizable() || isEnum())
@@ -1094,6 +1112,11 @@ outer:
 
   boolean isProxyClass = false;
 
+/* GCJ LOCAL */
+  // True after setFields() has been called
+  private boolean fieldsSet = false;
+/* END GCJ LOCAL */
+
   // This is probably not necessary because this class is special cased already
   // but it will avoid showing up as a discrepancy when comparing SUIDs.
   private static final long serialVersionUID = -6120832682080437368L;