1 files changed, 6 insertions, 4 deletions
diff --git a/src/main/javassist/tools/Callback.java b/src/main/javassist/tools/Callback.java
index c3095ccb..c0c88094 100644
--- a/src/main/javassist/tools/Callback.java
+++ b/src/main/javassist/tools/Callback.java
@@ -16,12 +16,13 @@
 
 package javassist.tools;
 
-import javassist.CannotCompileException;
-import javassist.CtBehavior;
-
 import java.util.HashMap;
+import java.util.Map;
 import java.util.UUID;
 
+import javassist.CannotCompileException;
+import javassist.CtBehavior;
+
 /**
  * Creates bytecode that when executed calls back to the instance's result method.
  *
@@ -49,7 +50,7 @@ import java.util.UUID;
  */
 public abstract class Callback {
 
-    public static HashMap callbacks = new HashMap();
+    public static Map<String,Callback> callbacks = new HashMap<String,Callback>();
 
     private final String sourceCode;
 
@@ -73,6 +74,7 @@ public abstract class Callback {
      */
     public abstract void result(Object[] objects);
 
+    @Override
     public String toString(){
         return sourceCode();
     }