diff --git a/TracerOnJavassist/src/tracer/ITraceGenerator.java b/TracerOnJavassist/src/tracer/ITraceGenerator.java
index 8695f5b..c6f80f2 100644
--- a/TracerOnJavassist/src/tracer/ITraceGenerator.java
+++ b/TracerOnJavassist/src/tracer/ITraceGenerator.java
@@ -48,4 +48,7 @@
 			CtMethod m, String blockId, String incomings, 
 			String threadId, String lineNum, String timeStamp);
 
+	public abstract String generateInsertBeforeStatementsForClassDefinition(
+			String className, String classPath, String loaderPath);
+
 }