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src/java.base/share/classes/java/lang/reflect/UndeclaredThrowableException.java

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@@ -23,10 +23,17 @@
  * questions.
  */
 
 package java.lang.reflect;
 
+import jdk.internal.misc.SharedSecrets;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.ObjectStreamField;
+
 /**
  * Thrown by a method invocation on a proxy instance if its invocation
  * handler's {@link InvocationHandler#invoke invoke} method throws a
  * checked exception (a {@code Throwable} that is not assignable
  * to {@code RuntimeException} or {@code Error}) that

@@ -57,25 +64,18 @@
  */
 public class UndeclaredThrowableException extends RuntimeException {
     static final long serialVersionUID = 330127114055056639L;
 
     /**
-     * the undeclared checked exception that was thrown
-     * @serial
-     */
-    private Throwable undeclaredThrowable;
-
-    /**
      * Constructs an {@code UndeclaredThrowableException} with the
      * specified {@code Throwable}.
      *
      * @param   undeclaredThrowable the undeclared checked exception
      *          that was thrown
      */
     public UndeclaredThrowableException(Throwable undeclaredThrowable) {
-        super((Throwable) null);  // Disallow initCause
-        this.undeclaredThrowable = undeclaredThrowable;
+        super(null, undeclaredThrowable);  // Disallow initCause
     }
 
     /**
      * Constructs an {@code UndeclaredThrowableException} with the
      * specified {@code Throwable} and a detail message.

@@ -85,12 +85,11 @@
      * @param   s the detail message
      */
     public UndeclaredThrowableException(Throwable undeclaredThrowable,
                                         String s)
     {
-        super(s, null);  // Disallow initCause
-        this.undeclaredThrowable = undeclaredThrowable;
+        super(s, undeclaredThrowable);  // Disallow initCause
     }
 
     /**
      * Returns the {@code Throwable} instance wrapped in this
      * {@code UndeclaredThrowableException}, which may be {@code null}.

@@ -100,20 +99,40 @@
      * obtaining this information.
      *
      * @return the undeclared checked exception that was thrown
      */
     public Throwable getUndeclaredThrowable() {
-        return undeclaredThrowable;
+        return getCause();
     }
 
     /**
-     * Returns the cause of this exception (the {@code Throwable}
-     * instance wrapped in this {@code UndeclaredThrowableException},
-     * which may be {@code null}).
+     * Serializable fields for UndeclaredThrowableException.
      *
-     * @return  the cause of this exception.
-     * @since   1.4
+     * @serialField undeclaredThrowable Throwable
      */
-    public Throwable getCause() {
-        return undeclaredThrowable;
+    private static final ObjectStreamField[] serialPersistentFields = {
+        new ObjectStreamField("undeclaredThrowable", Throwable.class)
+    };
+
+    /*
+     * Reconstitutes the UndeclaredThrowableException instance from a stream
+     * and initialize the cause properly when deserializing from an older
+     * version.
+     */
+    private void readObject(ObjectInputStream s) throws IOException, ClassNotFoundException {
+        ObjectInputStream.GetField fields = s.readFields();
+        Throwable exception = (Throwable) fields.get("undeclaredThrowable", null);
+        if (exception != null) {
+            SharedSecrets.getJavaLangAccess().setCause(this, exception);
+        }
+    }
+
+    /*
+     * To maintain compatibility with older implementation, write a serial
+     * "ex" field with the cause as the value.
+     */
+    private void writeObject(ObjectOutputStream out) throws IOException {
+        ObjectOutputStream.PutField fields = out.putFields();
+        fields.put("undeclaredThrowable", getCause());
+        out.writeFields();
     }
 }
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