diff --git a/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackModel.java b/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackModel.java
index 86040d9..c5503b5 100644
--- a/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackModel.java
+++ b/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackModel.java
@@ -14,25 +14,14 @@
 import com.sun.jdi.VirtualMachine;
 
 public class CallStackModel {
-	private ObjectReference methodExecution;
-//	private ObjectReference childMethodExecution;
 	private MethodCaller methodExecutionMc;
 	private int callLineNo;
 
-//	public CallStackModel(VirtualMachine vm, ThreadReference thread, ObjectReference methodExecution, ObjectReference childMethodExecution) {
-//		methodExecutionMc = new MethodCaller(vm, thread, methodExecution);
-//		this.methodExecution = methodExecution;
-//		this.childMethodExecution = childMethodExecution;
-//	}
-	
 	public CallStackModel(VirtualMachine vm, ThreadReference thread, ObjectReference methodExecution, int callLineNo) {
 		methodExecutionMc = new MethodCaller(vm, thread, methodExecution);
-		this.methodExecution = methodExecution;
 		this.callLineNo = callLineNo;
-//		this.childMethodExecution = childMethodExecution;
 	}
 
-	
 	public VirtualMachine getVm() {
 		return methodExecutionMc.getVm();
 	}
@@ -49,22 +38,6 @@
 		return callLineNo;
 	}
 	
-//	public int getCallLineNo() {
-//		if (childMethodExecution == null) {
-//			return -1;
-//		}
-//		int callLineNo = -1;
-//		try {
-//			ObjectReference callStatement = (ObjectReference)methodExecutionMc.callInstanceMethod("getMethodInvocation", childMethodExecution);
-//			MethodCaller callStatementMc = new MethodCaller(methodExecutionMc.getVm(), methodExecutionMc.getThread(), callStatement);
-//			callLineNo = ((IntegerValue)callStatementMc.callInstanceMethod("getLineNo")).value();
-//		} catch (InvalidTypeException | ClassNotLoadedException
-//				| InvocationException | IncompatibleThreadStateException e) {
-//			e.printStackTrace();
-//		}
-//		return callLineNo;
-//	}
-	
 	public String getSignature() {
 		String signature = "";
 		try {