diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/ITraceGenerator.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/ITraceGenerator.java
index a39f372..27c8c28 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/ITraceGenerator.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/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);
+
 }
diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/JSONTraceGenerator.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/JSONTraceGenerator.java
index 0d67a0c..473bd23 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/JSONTraceGenerator.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/JSONTraceGenerator.java
@@ -151,6 +151,17 @@
 		keys.add("time");				values.add(timeStamp);
 		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
 	}
+
+	@Override
+	public String generateInsertBeforeStatementsForClassDefinition(String className, String classPath, String loaderPath) {
+		ArrayList<String> keys = new ArrayList<>();
+		ArrayList<String> values = new ArrayList<>();
+		keys.add("type");				values.add(DQ_GEN + " + \"classDef\" + " + DQ_GEN);
+		keys.add("name");				values.add(DQ_GEN + " + " + className + " + " + DQ_GEN);
+		keys.add("path");				values.add(DQ_GEN + " + " + classPath + " + " + DQ_GEN);
+		keys.add("loaderPath");			values.add(DQ_GEN + " + " + loaderPath + " + " + DQ_GEN);
+		return Tracer.TRACER + "MyPrintStream.println(" + generateJSONMapGenerator(keys, values) + " + \",\");";
+	}
 	
 	private String generateJSONObjectGenerator(String className, String objectId) {
 		ArrayList<String> keys = new ArrayList<>();
diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/OutputStatementsGenerator.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/OutputStatementsGenerator.java
index 50c0bb5..baf5c72 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/OutputStatementsGenerator.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/OutputStatementsGenerator.java
@@ -252,4 +252,11 @@
 		String timeStamp = "System.nanoTime()";
 		return generator.generateInsertStatementsForBlockEntry(m, blockId, incomings, threadId, lineNum, timeStamp);		
 	}
+
+	public String generateInsertBeforeStatementsForClassDefinition(CtClass cc, CtConstructor classInitializer) throws NotFoundException {
+		String className = "\"" + cc.getName() + "\"";
+		String classPath = "\"" + cc.getURL().getPath() + "\"";
+		String loaderPath = "\"" + cc.getClassPool().getClassLoader().getResource("").getPath() + "\"";
+		return generator.generateInsertBeforeStatementsForClassDefinition(className, classPath, loaderPath);
+	}
 }
diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/PlainTextTraceGenerator.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/PlainTextTraceGenerator.java
index 0da32cd..781f69f 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/PlainTextTraceGenerator.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/PlainTextTraceGenerator.java
@@ -101,8 +101,7 @@
 	}
 
 	@Override
-	public String generateInsertStatementsForCall(CtBehavior m, String lineNum,
-			String threadId) {
+	public String generateInsertStatementsForCall(CtBehavior m, String lineNum, String threadId) {
 		return "";
 	}
 
@@ -112,4 +111,10 @@
 			String threadId, String lineNum, String timeStamp) {
 		return "";
 	}
+
+	@Override
+	public String generateInsertBeforeStatementsForClassDefinition(
+			String className, String classPath, String loaderPath) {
+		return "";
+	}
 }
diff --git a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/Tracer.java b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/Tracer.java
index 731e727..2f7453d 100644
--- a/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/Tracer.java
+++ b/org.ntlab.traceCollector/src/org/ntlab/traceCollector/tracer/Tracer.java
@@ -117,8 +117,10 @@
 	 * @param cc Javassist�̃N���X�I�u�W�F�N�g
 	 */
 	public static void classInstrumentation(CtClass cc) throws BadBytecode, NotFoundException, CannotCompileException, IOException {
+		classInitializerInstrumentation(cc, cc.getClassInitializer());
+		
 		for (final CtConstructor c : cc.getDeclaredConstructors()) {
-			methodInstrumentation(cc, c);				
+			methodInstrumentation(cc, c);
 		}
 		for (final CtMethod m : cc.getDeclaredMethods()) {
 			methodInstrumentation(cc, m);
@@ -126,6 +128,15 @@
 		cc.instrument(conv);
 	}
 
+	private static void classInitializerInstrumentation(CtClass cc, CtConstructor classInitializer) throws BadBytecode, NotFoundException, CannotCompileException {
+		if (classInitializer != null) {
+			methodInstrumentation(cc, classInitializer);
+		} else {
+			classInitializer = cc.makeClassInitializer();
+		}
+		classInitializer.insertBefore(outputStatementsGenerator.generateInsertBeforeStatementsForClassDefinition(cc, classInitializer));
+	}
+
 	private static void methodInstrumentation(final CtClass cc, final CtBehavior m) throws BadBytecode, NotFoundException, CannotCompileException {
 		// ���\�b�h�{�̓��̊e�u���b�N�̍ŏ��ɏo�͕���}������(�o�͕��̑}���Ńu���b�N�������Ă��܂��̂ŁA��ɑ}�����Ă���)
 		Block[] blocks = null;