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diff --git a/libjava/classpath/java/io/ObjectStreamField.java b/libjava/classpath/java/io/ObjectStreamField.java
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+++ b/libjava/classpath/java/io/ObjectStreamField.java
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+/* ObjectStreamField.java -- Class used to store name and class of fields
+   Copyright (C) 1998, 1999, 2003, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.io;
+
+import gnu.java.lang.reflect.TypeSignature;
+
+import java.lang.reflect.Field;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+/**
+ * This class intends to describe the field of a class for the serialization
+ * subsystem. Serializable fields in a serializable class can be explicitly
+ * exported using an array of ObjectStreamFields.
+ */
+public class ObjectStreamField implements Comparable
+{
+  private String name;
+  private Class type;
+  private String typename;
+  private int offset = -1; // XXX make sure this is correct
+  private boolean unshared;
+  private boolean persistent = false;
+  private boolean toset = true;
+  private Field field;
+
+  ObjectStreamField (Field field)
+  {
+    this (field.getName(), field.getType());
+    this.field = field;
+  }
+
+  /**
+   * This constructor creates an ObjectStreamField instance 
+   * which represents a field named <code>name</code> and is
+   * of the type <code>type</code>.
+   *
+   * @param name Name of the field to export.
+   * @param type Type of the field in the concerned class.
+   */
+  public ObjectStreamField (String name, Class type)
+  {
+    this (name, type, false);
+  }
+
+  /**
+   * This constructor creates an ObjectStreamField instance 
+   * which represents a field named <code>name</code> and is
+   * of the type <code>type</code>.
+   *
+   * @param name Name of the field to export.
+   * @param type Type of the field in the concerned class.
+   * @param unshared true if field will be unshared, false otherwise.
+   */
+  public ObjectStreamField (String name, Class type, boolean unshared)
+  {
+    if (name == null)
+      throw new NullPointerException();
+
+    this.name = name;
+    this.type = type;
+    this.typename = TypeSignature.getEncodingOfClass(type);
+    this.unshared = unshared;
+  }
+ 
+  /**
+   * There are many cases you can not get java.lang.Class from typename 
+   * if your context class loader cannot load it, then use typename to
+   * construct the field.
+   *
+   * @param name Name of the field to export.
+   * @param typename The coded name of the type for this field.
+   */
+  ObjectStreamField (String name, String typename)
+  {
+    this.name = name;
+    this.typename = typename;
+    try
+      {
+        type = TypeSignature.getClassForEncoding(typename);
+      }
+    catch(ClassNotFoundException e)
+      {
+      }
+  }
+  
+  /**
+   * There are many cases you can not get java.lang.Class from typename 
+   * if your context class loader cann not load it, then use typename to
+   * construct the field.
+   *
+   * @param name Name of the field to export.
+   * @param typename The coded name of the type for this field.
+   * @param loader The class loader to use to resolve class names.
+   */
+  ObjectStreamField (String name, String typename, ClassLoader loader)
+  {
+    this.name = name;
+    this.typename = typename;
+    try
+      {
+        type = TypeSignature.getClassForEncoding(typename, true, loader);
+      }
+    catch(ClassNotFoundException e)
+      {
+      }
+  }
+
+  /**
+   * This method returns the name of the field represented by the
+   * ObjectStreamField instance.
+   *
+   * @return A string containing the name of the field.
+   */
+  public String getName ()
+  {
+    return name;
+  }
+
+  /**
+   * This method returns the class representing the type of the
+   * field which is represented by this instance of ObjectStreamField.
+   *
+   * @return A class representing the type of the field.
+   */
+  public Class getType ()
+  {
+    return type;
+  }
+
+  /**
+   * This method returns the char encoded type of the field which
+   * is represented by this instance of ObjectStreamField.
+   *
+   * @return A char representing the type of the field.
+   */
+  public char getTypeCode ()
+  {
+    return typename.charAt (0);
+  }
+
+  /**
+   * This method returns a more explicit type name than
+   * {@link #getTypeCode()} in the case the type is a real
+   * class (and not a primitive).
+   *
+   * @return The name of the type (class name) if it is not a 
+   * primitive, in the other case null is returned.
+   */
+  public String getTypeString ()
+  {
+    // use intern()
+    if (isPrimitive())
+      return null;
+    return typename.intern();
+  }
+
+  /**
+   * This method returns the current offset of the field in
+   * the serialization stream relatively to the other fields.
+   * The offset is expressed in bytes.
+   *
+   * @return The offset of the field in bytes.
+   * @see #setOffset(int)
+   */
+  public int getOffset ()
+  {
+    return offset;
+  }
+
+  /**
+   * This method sets the current offset of the field.
+   * 
+   * @param off The offset of the field in bytes.
+   * @see getOffset()
+   */
+  protected void setOffset (int off)
+  {
+    offset = off;
+  }
+
+  /**
+   * This method returns whether the field represented by this object is
+   * unshared or not.
+   *
+   * @return Tells if this field is unshared or not.
+   */
+  public boolean isUnshared ()
+  {
+    return unshared;
+  }
+
+  /**
+   * This method returns true if the type of the field
+   * represented by this instance is a primitive.
+   *
+   * @return true if the type is a primitive, false
+   * in the other case.
+   */
+  public boolean isPrimitive ()
+  {
+    return typename.length() == 1;
+  }
+
+  /**
+   * Compares this object to the given object.
+   *
+   * @param obj the object to compare to.
+   *
+   * @return -1, 0 or 1.
+   */
+  public int compareTo (Object obj)
+  {
+    ObjectStreamField f = (ObjectStreamField) obj;
+    boolean this_is_primitive = isPrimitive ();
+    boolean f_is_primitive = f.isPrimitive ();
+
+    if (this_is_primitive && !f_is_primitive)
+      return -1;
+
+    if (!this_is_primitive && f_is_primitive)
+      return 1;
+
+    return getName ().compareTo (f.getName ());
+  }
+
+  /**
+   * This method is specific to classpath's implementation and so has the default
+   * access. It changes the state of this field to "persistent". It means that
+   * the field should not be changed when the stream is read (if it is not
+   * explicitly specified using serialPersistentFields).
+   *
+   * @param persistent True if the field is persistent, false in the 
+   * other cases.
+   * @see #isPersistent()
+   */
+  void setPersistent(boolean persistent)
+  {
+    this.persistent = persistent;
+  }
+
+  /**
+   * This method returns true if the field is marked as persistent.
+   *
+   * @return True if persistent, false in the other cases.
+   * @see #setPersistent(boolean)
+   */
+  boolean isPersistent()
+  {
+    return persistent;
+  }
+
+  /**
+   * This method is specific to classpath's implementation and so 
+   * has the default access. It changes the state of this field as
+   * to be set by ObjectInputStream.
+   *
+   * @param toset True if this field should be set, false in the other
+   * cases.
+   * @see #isToSet()
+   */
+  void setToSet(boolean toset)
+  {
+    this.toset = toset;
+  }
+
+  /**
+   * This method returns true if the field is marked as to be
+   * set.
+   *
+   * @return True if it is to be set, false in the other cases.
+   * @see #setToSet(boolean)
+   */
+  boolean isToSet()
+  {
+    return toset;
+  }
+
+  /**
+   * This method searches for its field reference in the specified class
+   * object. It requests privileges. If an error occurs the internal field
+   * reference is not modified.
+   *
+   * @throws NoSuchFieldException if the field name does not exist in this class.
+   * @throws SecurityException if there was an error requesting the privileges.
+   */
+  void lookupField(Class clazz) throws NoSuchFieldException, SecurityException
+  {
+    final Field f = clazz.getDeclaredField(name);
+    
+    AccessController.doPrivileged(new PrivilegedAction()
+      {
+	public Object run()
+	{
+	  f.setAccessible(true);
+	  return null;
+	}
+      });
+    
+    this.field = f;
+  }
+
+  /**
+   * This method check whether the field described by this
+   * instance of ObjectStreamField is compatible with the
+   * actual implementation of this field.
+   *
+   * @throws NullPointerException if this field does not exist
+   * in the real class.
+   * @throws InvalidClassException if the types are incompatible.
+   */
+  void checkFieldType() throws InvalidClassException
+  {
+    Class ftype = field.getType();
+
+    if (!ftype.isAssignableFrom(type))
+      throw new InvalidClassException
+	("invalid field type for " + name +
+	 " in class " + field.getDeclaringClass());
+  }
+
+  /**
+   * Returns a string representing this object.
+   *
+   * @return the string.
+   */
+  public String toString ()
+  {
+    return "ObjectStreamField< " + type + " " + name + " >";
+  }
+
+  final void setBooleanField(Object obj, boolean val)
+  {
+    VMObjectStreamClass.setBooleanNative(field, obj, val);  
+  }
+
+  final void setByteField(Object obj, byte val)
+  {
+    VMObjectStreamClass.setByteNative(field, obj, val);
+  }
+  
+  final void setCharField(Object obj, char val)
+  {
+    VMObjectStreamClass.setCharNative(field, obj, val);
+  }
+  
+  final void setShortField(Object obj, short val)
+  {
+    VMObjectStreamClass.setShortNative(field, obj, val);
+  }
+
+  final void setIntField(Object obj, int val)
+  {
+    VMObjectStreamClass.setIntNative(field, obj, val);
+  }
+  
+  final void setLongField(Object obj, long val)
+  {
+    VMObjectStreamClass.setLongNative(field, obj, val);
+  }
+  
+  final void setFloatField(Object obj, float val)
+  {
+    VMObjectStreamClass.setFloatNative(field, obj, val);
+  }
+  
+  final void setDoubleField(Object obj, double val)
+  {
+    VMObjectStreamClass.setDoubleNative(field, obj, val);
+  }
+  
+  final void setObjectField(Object obj, Object val)
+  { 
+    VMObjectStreamClass.setObjectNative(field, obj, val);
+  }
+}