diff --git a/spring-core/src/main/java/org/springframework/asm/ByteVector.java b/spring-core/src/main/java/org/springframework/asm/ByteVector.java
index a0b0ac97f2..e89184ae72 100644
--- a/spring-core/src/main/java/org/springframework/asm/ByteVector.java
+++ b/spring-core/src/main/java/org/springframework/asm/ByteVector.java
@@ -204,11 +204,14 @@ public class ByteVector {
      * automatically enlarged if necessary.
      * 
      * @param s
-     *            a String.
+     *            a String whose UTF8 encoded length must be less than 65536.
      * @return this byte vector.
      */
     public ByteVector putUTF8(final String s) {
         int charLength = s.length();
+        if (charLength > 65535) {
+            throw new IllegalArgumentException();
+        }
         int len = length;
         if (len + 2 + charLength > data.length) {
             enlarge(2 + charLength);
@@ -238,6 +241,9 @@ public class ByteVector {
                         byteLength += 2;
                     }
                 }
+                if (byteLength > 65535) {
+                    throw new IllegalArgumentException();
+                }
                 data[length] = (byte) (byteLength >>> 8);
                 data[length + 1] = (byte) byteLength;
                 if (length + 2 + byteLength > data.length) {
diff --git a/spring-core/src/main/java/org/springframework/asm/ClassWriter.java b/spring-core/src/main/java/org/springframework/asm/ClassWriter.java
index 1dbfee9009..d7fbf52f4c 100644
--- a/spring-core/src/main/java/org/springframework/asm/ClassWriter.java
+++ b/spring-core/src/main/java/org/springframework/asm/ClassWriter.java
@@ -477,12 +477,12 @@ public class ClassWriter extends ClassVisitor {
      * <tt>true</tt> if the maximum stack size and number of local variables
      * must be automatically computed.
      */
-    private final boolean computeMaxs;
+    private boolean computeMaxs;
 
     /**
      * <tt>true</tt> if the stack map frames must be recomputed from scratch.
      */
-    private final boolean computeFrames;
+    private boolean computeFrames;
 
     /**
      * <tt>true</tt> if the stack map tables of this class are invalid. The
@@ -908,9 +908,22 @@ public class ClassWriter extends ClassVisitor {
             attrs.put(this, null, 0, -1, -1, out);
         }
         if (invalidFrames) {
-            ClassWriter cw = new ClassWriter(COMPUTE_FRAMES);
-            new ClassReader(out.data).accept(cw, ClassReader.SKIP_FRAMES);
-            return cw.toByteArray();
+            anns = null;
+            ianns = null;
+            attrs = null;
+            innerClassesCount = 0;
+            innerClasses = null;
+            bootstrapMethodsCount = 0;
+            bootstrapMethods = null;
+            firstField = null;
+            lastField = null;
+            firstMethod = null;
+            lastMethod = null;
+            computeMaxs = false;
+            computeFrames = true;
+            invalidFrames = false;
+            new ClassReader(out.data).accept(this, ClassReader.SKIP_FRAMES);
+            return toByteArray();
         }
         return out.data;
     }
diff --git a/spring-core/src/main/java/org/springframework/asm/Handle.java b/spring-core/src/main/java/org/springframework/asm/Handle.java
index 8c22338524..adc6f09790 100644
--- a/spring-core/src/main/java/org/springframework/asm/Handle.java
+++ b/spring-core/src/main/java/org/springframework/asm/Handle.java
@@ -49,7 +49,8 @@ public final class Handle {
     final int tag;
 
     /**
-     * The internal name of the field or method designed by this handle.
+     * The internal name of the class that owns the field or method designated
+     * by this handle.
      */
     final String owner;
 
@@ -76,8 +77,8 @@ public final class Handle {
      *            {@link Opcodes#H_NEWINVOKESPECIAL} or
      *            {@link Opcodes#H_INVOKEINTERFACE}.
      * @param owner
-     *            the internal name of the field or method designed by this
-     *            handle.
+     *            the internal name of the class that owns the field or method
+     *            designated by this handle.
      * @param name
      *            the name of the field or method designated by this handle.
      * @param desc
@@ -106,9 +107,11 @@ public final class Handle {
     }
 
     /**
-     * Returns the internal name of the field or method designed by this handle.
+     * Returns the internal name of the class that owns the field or method
+     * designated by this handle.
      * 
-     * @return the internal name of the field or method designed by this handle.
+     * @return the internal name of the class that owns the field or method
+     *         designated by this handle.
      */
     public String getOwner() {
         return owner;
@@ -154,7 +157,7 @@ public final class Handle {
      * Returns the textual representation of this handle. The textual
      * representation is:
      * 
-     * <pre class="code">
+     * <pre>
      * owner '.' name desc ' ' '(' tag ')'
      * </pre>
      *