diff --git a/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackMethodExecutions.java b/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackMethodExecutions.java
deleted file mode 100644
index b711506..0000000
--- a/org.ntlab.reverseDebugger/src/org/ntlab/reversedebugger/CallStackMethodExecutions.java
+++ /dev/null
@@ -1,97 +0,0 @@
-package org.ntlab.reversedebugger;
-
-import java.util.ArrayList;
-import java.util.List;
-
-import org.eclipse.jface.viewers.TreeNode;
-import org.ntlab.debuggingControl.MethodCaller;
-
-import com.sun.jdi.ClassNotLoadedException;
-import com.sun.jdi.IncompatibleThreadStateException;
-import com.sun.jdi.IntegerValue;
-import com.sun.jdi.InvalidTypeException;
-import com.sun.jdi.InvocationException;
-import com.sun.jdi.ObjectReference;
-import com.sun.jdi.ThreadReference;
-import com.sun.jdi.Value;
-import com.sun.jdi.VirtualMachine;
-import com.sun.jdi.event.MethodEntryEvent;
-
-public class CallStackMethodExecutions {
-	private List<CallStackModel> callStackMethodExecutions = new ArrayList<>();
-
-	public List<CallStackModel> getCallStackMethodExecutions() {
-		return callStackMethodExecutions;
-	}
-
-	public TreeNode[] getCallStackMethodExecutionsTreeNode() {
-		TreeNode[] roots = new TreeNode[1];
-		if (callStackMethodExecutions.isEmpty()) {
-			return roots;
-		}
-		CallStackModel callStackModel = callStackMethodExecutions.get(0);
-		roots[0] = new TreeNode(new MethodCaller(callStackModel.getVm(), callStackModel.getThread()));
-		TreeNode parentNode = roots[0];
-		TreeNode[] childrenNode = new TreeNode[callStackMethodExecutions.size()];
-		parentNode.setChildren(childrenNode);
-		for (int i = 0; i < callStackMethodExecutions.size(); i++) {
-			TreeNode childNode = new TreeNode(callStackMethodExecutions.get(i));
-			childNode.setParent(parentNode);
-			childrenNode[i] = childNode;
-		}
-		return roots;
-	}
-	
-	public void reset() {
-		callStackMethodExecutions.clear();
-	}
-	
-	public void updateByDebuggerStopMethodExecution(MethodCaller me) {
-		if (me == null) {
-			return;
-		}
-		try {
-			VirtualMachine vm = me.getVm();
-			ThreadReference thread = me.getThread();
-			int lineNo = thread.frame(0).location().lineNumber();
-			update(vm, thread, me.getObj(), lineNo);
-		} catch (InvalidTypeException | ClassNotLoadedException 
-				| InvocationException | IncompatibleThreadStateException e) {
-			e.printStackTrace();
-		}
-	}
-
-	public void updateByAlias(MethodCaller alias) {
-		if (alias == null) {
-			return;
-		}
-		VirtualMachine vm = alias.getVm();
-		ThreadReference thread = alias.getThread();
-		try {
-			ObjectReference me = (ObjectReference)alias.callInstanceMethod("getMethodExecution");
-			int lineNo = ((IntegerValue)alias.callInstanceMethod("getLineNo")).value();
-			update(vm, thread, me, lineNo);
-		} catch (InvalidTypeException | ClassNotLoadedException 
-				| InvocationException | IncompatibleThreadStateException e) {
-			e.printStackTrace();
-		}
-	}
-
-	private void update(VirtualMachine vm, ThreadReference thread, ObjectReference me, int topMethodCallLineNo)
-			throws InvalidTypeException, ClassNotLoadedException, InvocationException, IncompatibleThreadStateException {
-		callStackMethodExecutions.clear();
-		ObjectReference childMe = null;
-		int callLineNo = topMethodCallLineNo;
-		while (me != null) {
-			CallStackModel callStackModel = new CallStackModel(vm, thread, me, callLineNo);
-			callStackMethodExecutions.add(callStackModel);
-			childMe = me;
-			me = (ObjectReference)callStackModel.callInstanceMethod("getParent");
-			if (me != null) {
-				MethodCaller mc = new MethodCaller(vm, thread, me);
-				ObjectReference callStatement = (ObjectReference)mc.callInstanceMethod("getMethodInvocation", childMe);
-				callLineNo = ((IntegerValue)mc.setObj(callStatement).callInstanceMethod("getLineNo")).value();
-			}
-		}
-	}	
-}