diff --git a/TracerOnJavassist/src/tracer/JSONTraceGenerator.java b/TracerOnJavassist/src/tracer/JSONTraceGenerator.java
index f9f0f65..83ec795 100644
--- a/TracerOnJavassist/src/tracer/JSONTraceGenerator.java
+++ b/TracerOnJavassist/src/tracer/JSONTraceGenerator.java
@@ -32,7 +32,7 @@
 		keys.add("lineNum");	values.add(lineNum);
 		keys.add("time");		values.add(timeStamp);
 		return "$proceed($$); " + 
-				"tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+				Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 
 	@Override
@@ -52,7 +52,7 @@
 		keys.add("lineNum");	values.add(lineNum);
 		keys.add("time");		values.add(timeStamp);
 		return "$_ = $proceed(); " + 
-				"tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+				Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 	
 
@@ -69,7 +69,7 @@
 		keys.add("lineNum");	values.add(lineNum);
 		keys.add("time");		values.add(timeStamp);
 		return "$_ = $proceed($$); " + 
-				"tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+				Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 
 	@Override
@@ -98,7 +98,7 @@
 		keys.add("args");			values.add(generateJSONArrayGenerator(argList));
 		keys.add("threadId");		values.add(threadId);
 		keys.add("time");			values.add(timeStamp);
-		return "tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 
 	@Override
@@ -120,7 +120,7 @@
 		keys.add("returnValue");	values.add(generateJSONObjectGenerator(returnedClass, returnedObject));
 		keys.add("threadId");		values.add(threadId);
 		keys.add("time");			values.add(timeStamp);
-		return "tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 
 	@Override
@@ -131,7 +131,7 @@
 		keys.add("callerSideSignature");	values.add(DQ_GEN + " + \"" + m.getLongName().replace('$', '.') + "\" + " + DQ_GEN);		// AspectJ�ł̓��\�b�h�V�O�j�`�����ł͖����N���X�̓h�b�g�ŋ�؂���
 		keys.add("threadId");				values.add(threadId);
 		keys.add("lineNum");				values.add(lineNum);
-		return "tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 
 	@Override
@@ -149,7 +149,7 @@
 		keys.add("threadId");			values.add(threadId);
 		keys.add("lineNum");			values.add(lineNum);
 		keys.add("time");				values.add(timeStamp);
-		return "tracer.MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
 	
 	private String generateJSONObjectGenerator(String className, String objectId) {
diff --git a/TracerOnJavassist/src/tracer/PlainTextTraceGenerator.java b/TracerOnJavassist/src/tracer/PlainTextTraceGenerator.java
index f3d3aff..19ce09c 100644
--- a/TracerOnJavassist/src/tracer/PlainTextTraceGenerator.java
+++ b/TracerOnJavassist/src/tracer/PlainTextTraceGenerator.java
@@ -13,15 +13,15 @@
  *
  */
 public class PlainTextTraceGenerator implements ITraceGenerator {
-	public static final String LINE_AND_THREAD = "\":Line \" + (tracer.Tracer.lineNo++) + \":ThreadNo \" + ";
-	public static final String LINE = "\":Line \" + (tracer.Tracer.lineNo++) + \":\"";
+	public static final String LINE_AND_THREAD = "\":Line \" + (" + Tracer.TRACER + "Tracer.lineNo++) + \":ThreadNo \" + ";
+	public static final String LINE = "\":Line \" + (" + Tracer.TRACER + "Tracer.lineNo++) + \":\"";
 
 	@Override
 	public String generateReplaceStatementsForFieldSet(
 			String fieldName, String containerClass, String containerObject, 
 			String valueClass, String valueObject, String threadId, String lineNum, String timeStamp) {
 		return "$proceed($$); " + 
-					"tracer.MyPrintStream.println(\"set:\" + " + containerClass + " + \":\" + " + containerObject + " + \":\" + " + 
+					Tracer.TRACER + "MyPrintStream.println(\"set:\" + " + containerClass + " + \":\" + " + containerObject + " + \":\" + " + 
 													valueClass + " + \":\" + " + valueObject + " + " + LINE_AND_THREAD + threadId + ");";
 	}
 
@@ -30,7 +30,7 @@
 			String fieldName, String thisClass, String thisObject, String containerClass, String containerObject, 
 			String valueClass, String valueObject, String threadId, String lineNum, String timeStamp) {
 		return "$_ = $proceed(); " + 
-					"tracer.MyPrintStream.println(\"get:\" + " + thisClass + " + \":\" + " + thisObject + " + \":\" + " + 
+					Tracer.TRACER + "MyPrintStream.println(\"get:\" + " + thisClass + " + \":\" + " + thisObject + " + \":\" + " + 
 													containerClass + " + \":\" + " + containerObject + " + \":\" + " + 
 													valueClass + " + \":\" + " + valueObject + " + " + LINE_AND_THREAD + threadId + ");";
 	}
@@ -52,7 +52,7 @@
 		String classOutput = "";
 		String argsOutput = "";
 		// �����̏o��
-		String delimiter = "tracer.MyPrintStream.println(\"Args:\" + ";
+		String delimiter = Tracer.TRACER + "MyPrintStream.println(\"Args:\" + ";
 		for (int p = 0; p < argClasses.size(); p++) {
 			argsOutput += delimiter + argClasses.get(p) + " + \":\" + " + argObjects.get(p);
 			delimiter = " + \":\" + ";
@@ -62,11 +62,11 @@
 		}
 		if (m instanceof CtConstructor) {
 			// �R���X�g���N�^�̏ꍇ
-			newOutput = "tracer.MyPrintStream.println(\"New \" + " + thisClass + " + \":\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
+			newOutput = Tracer.TRACER + "MyPrintStream.println(\"New \" + " + thisClass + " + \":\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
 		}
-		methodOutput = "tracer.MyPrintStream.println(\"Method \" + " + thisClass + " + \",\" + " + methodSignature
+		methodOutput = Tracer.TRACER + "MyPrintStream.println(\"Method \" + " + thisClass + " + \",\" + " + methodSignature
 				+ " + \":\" + " + thisObject + " + " + LINE + " + " + timeStamp + " + \":ThreadNo \" + " + threadId + ");";
-		classOutput = "tracer.MyPrintStream.println(\"Class \" + " + thisClass + " + \":\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
+		classOutput = Tracer.TRACER + "MyPrintStream.println(\"Class \" + " + thisClass + " + \":\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
 		
 		return newOutput + methodOutput + classOutput + argsOutput;
 	}	
@@ -94,8 +94,8 @@
 			}
 		}
 		
-		String returnOutput =  "tracer.MyPrintStream.print(\"Return " + invocationType + "(" + shortName + "):\" + " + returnedClass + " + \":\" + " + returnedObject + " + \":\");" + 
-				"tracer.MyPrintStream.println(\"\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
+		String returnOutput =  Tracer.TRACER + "MyPrintStream.print(\"Return " + invocationType + "(" + shortName + "):\" + " + returnedClass + " + \":\" + " + returnedObject + " + \":\");" + 
+				Tracer.TRACER + "MyPrintStream.println(\"\" + " + thisObject + " + " + LINE_AND_THREAD + threadId + ");";
 
 		return returnOutput;
 	}
diff --git a/TracerOnJavassist/src/tracer/Tracer.java b/TracerOnJavassist/src/tracer/Tracer.java
index b8858c6..7403baf 100644
--- a/TracerOnJavassist/src/tracer/Tracer.java
+++ b/TracerOnJavassist/src/tracer/Tracer.java
@@ -31,11 +31,11 @@
  */
 public class Tracer {
 	public static int lineNo = 1;
+	public static final String TRACER = "tracer.";
 	private static final String STANDARD_CLASSES = "java.util.ListIterator|java.util.Iterator|java.util.List|java.util.Vector|java.util.ArrayList|java.util.Stack|java.util.Map|java.util.HashMap|java.util.Set|java.util.HashSet|java.util.Hashtable|java.util.LinkedList|java.lang.Thread";
 	private static final String CONCRETE_STANDARD_CLASSES = "java.util.Vector|java.util.ArrayList|java.util.Stack |java.util.HashMap|java.util.HashSet|java.util.Hashtable|java.util.LinkedList|java.lang.Thread";
 	private static final String EXCEPT_FOR_METHODS = "java.lang.Thread.currentThread..|java.lang.Thread.getId..";
 	private static final String STANDARD_LIB = "java.";
-	private static final String TRACER = "tracer.";
 	private static OutputStatementsGenerator outputStatementsGenerator = null;
 	private static CodeConverter conv = new CodeConverter();
 
@@ -57,7 +57,7 @@
 			ClassPool cp = ClassPool.getDefault();
 			CtClass cc;
 			try {
-				cc = cp.get("tracer.JSONArrayAdvisor");			// JSON�̏ꍇ�̂ݔz��A�N�Z�X���o�͂���
+				cc = cp.get(TRACER + "JSONArrayAdvisor");			// JSON�̏ꍇ�̂ݔz��A�N�Z�X���o�͂���
 				conv.replaceArrayAccess(cc, new CodeConverter.DefaultArrayAccessReplacementMethodNames());
 			} catch (NotFoundException e1) {
 				e1.printStackTrace();
diff --git a/TracerOnJavassist/src/tracer/TracerClassLoader.java b/TracerOnJavassist/src/tracer/TracerClassLoader.java
index b6f225c..132edc4 100644
--- a/TracerOnJavassist/src/tracer/TracerClassLoader.java
+++ b/TracerOnJavassist/src/tracer/TracerClassLoader.java
@@ -16,7 +16,7 @@
 		if (!Tracer.isInitialized()) Tracer.initialize(new OutputStatementsGenerator(new JSONTraceGenerator()));		// �����ŏo�̓t�H�[�}�b�g���w�肷��
 
 		// "java"�Ŏn�܂�p�b�P�[�W�̓V�X�e���n�Ȃ̂Ńf�t�H���g�̃N���X���[�_�[�ɔC����
-		if (name.startsWith("java") || name.startsWith("sun.") || name.startsWith("tracer.")) {
+		if (name.startsWith("java") || name.startsWith("sun.") || name.startsWith(Tracer.TRACER)) {
 			return super.loadClass(name, resolve);
 		}