diff --git a/ffi/java/MclTest.java b/ffi/java/MclTest.java
index d8ed0fb..ba8b4c8 100644
--- a/ffi/java/MclTest.java
+++ b/ffi/java/MclTest.java
@@ -11,11 +11,13 @@ public class MclTest {
 		System.out.println("libName : " + libName);
 		System.loadLibrary(lib);
 	}
+    public static int errN = 0;
 	public static void assertEquals(String msg, String x, String y) {
 		if (x.equals(y)) {
 			System.out.println("OK : " + msg);
 		} else {
 			System.out.println("NG : " + msg + ", x = " + x + ", y = " + y);
+            errN++;
 		}
 	}
 	public static void assertBool(String msg, boolean b) {
@@ -23,6 +25,7 @@ public class MclTest {
 			System.out.println("OK : " + msg);
 		} else {
 			System.out.println("NG : " + msg);
+            errN++;
 		}
 	}
 	public static void testCurve(int curveType, String name) {
@@ -43,14 +46,12 @@ public class MclTest {
 			assertEquals("x == 18", (new Fr("12", 16)).toString(), "18");
 			assertEquals("x == ff", (new Fr("255")).toString(16), "ff");
 
-/*
 			{
 				byte[] b = x.serialize();
 				Fr t = new Fr();
 				t.deserialize(b);
-				assertEquals("serialize", x, t);
+				assertBool("serialize", x.equals(t));
 			}
-*/
 			G1 P = new G1();
 			System.out.println("P=" + P);
 			Mcl.hashAndMapToG1(P, "test".getBytes());
@@ -60,6 +61,12 @@ public class MclTest {
 			System.out.println("P=" + P);
 			Mcl.neg(P, P);
 			System.out.println("P=" + P);
+			{
+				byte[] b = P.serialize();
+				G1 t = new G1();
+				t.deserialize(b);
+				assertBool("serialize", P.equals(t));
+			}
 
 			G2 Q = new G2();
 			Mcl.hashAndMapToG2(Q, "abc".getBytes());
@@ -72,6 +79,12 @@ public class MclTest {
 				P1.setStr(s);
 				assertBool("P == P1", P1.equals(P));
 			}
+			{
+				byte[] b = Q.serialize();
+				G2 t = new G2();
+				t.deserialize(b);
+				assertBool("serialize", Q.equals(t));
+			}
 
 			GT e = new GT();
 			Mcl.pairing(e, P, Q);
@@ -84,13 +97,23 @@ public class MclTest {
 			Mcl.pairing(e1, P, cQ);
 			Mcl.pow(e2, e, c); // e2 = e^c
 			assertBool("e1 == e2", e1.equals(e2));
-
+			{
+				byte[] b = e1.serialize();
+				GT t = new GT();
+				t.deserialize(b);
+				assertBool("serialize", e1.equals(t));
+			}
 			G1 cP = new G1(P);
 			Mcl.mul(cP, P, c); // cP = P * c
 			Mcl.pairing(e1, cP, Q);
 			assertBool("e1 == e2", e1.equals(e2));
 
 			BLSsignature(Q);
+            if (errN == 0) {
+                System.out.println("all test passed");
+            } else {
+                System.out.println("ERR=" + errN);
+            }
 		} catch (RuntimeException e) {
 			System.out.println("unknown exception :" + e);
 		}
diff --git a/ffi/java/com/herumi/mcl/Fp.java b/ffi/java/com/herumi/mcl/Fp.java
index 93b9732..aa4d1e8 100644
--- a/ffi/java/com/herumi/mcl/Fp.java
+++ b/ffi/java/com/herumi/mcl/Fp.java
@@ -91,4 +91,6 @@ public class Fp {
     MclJNI.Fp_deserialize(swigCPtr, this, cbuf);
   }
 
+  public byte[] serialize() { return MclJNI.Fp_serialize(swigCPtr, this); }
+
 }
diff --git a/ffi/java/com/herumi/mcl/Fr.java b/ffi/java/com/herumi/mcl/Fr.java
index a06a97a..2127f9d 100644
--- a/ffi/java/com/herumi/mcl/Fr.java
+++ b/ffi/java/com/herumi/mcl/Fr.java
@@ -91,4 +91,6 @@ public class Fr {
     MclJNI.Fr_deserialize(swigCPtr, this, cbuf);
   }
 
+  public byte[] serialize() { return MclJNI.Fr_serialize(swigCPtr, this); }
+
 }
diff --git a/ffi/java/com/herumi/mcl/G1.java b/ffi/java/com/herumi/mcl/G1.java
index 146d904..ec640b6 100644
--- a/ffi/java/com/herumi/mcl/G1.java
+++ b/ffi/java/com/herumi/mcl/G1.java
@@ -79,4 +79,6 @@ public class G1 {
     MclJNI.G1_deserialize(swigCPtr, this, cbuf);
   }
 
+  public byte[] serialize() { return MclJNI.G1_serialize(swigCPtr, this); }
+
 }
diff --git a/ffi/java/com/herumi/mcl/G2.java b/ffi/java/com/herumi/mcl/G2.java
index 5aded6d..2480dd3 100644
--- a/ffi/java/com/herumi/mcl/G2.java
+++ b/ffi/java/com/herumi/mcl/G2.java
@@ -79,4 +79,6 @@ public class G2 {
     MclJNI.G2_deserialize(swigCPtr, this, cbuf);
   }
 
+  public byte[] serialize() { return MclJNI.G2_serialize(swigCPtr, this); }
+
 }
diff --git a/ffi/java/com/herumi/mcl/GT.java b/ffi/java/com/herumi/mcl/GT.java
index 187af70..fdc590d 100644
--- a/ffi/java/com/herumi/mcl/GT.java
+++ b/ffi/java/com/herumi/mcl/GT.java
@@ -67,4 +67,10 @@ public class GT {
     return MclJNI.GT_toString__SWIG_1(swigCPtr, this);
   }
 
+  public void deserialize(byte[] cbuf) {
+    MclJNI.GT_deserialize(swigCPtr, this, cbuf);
+  }
+
+  public byte[] serialize() { return MclJNI.GT_serialize(swigCPtr, this); }
+
 }
diff --git a/ffi/java/com/herumi/mcl/MclJNI.java b/ffi/java/com/herumi/mcl/MclJNI.java
index 7181f50..9e7c008 100644
--- a/ffi/java/com/herumi/mcl/MclJNI.java
+++ b/ffi/java/com/herumi/mcl/MclJNI.java
@@ -32,6 +32,7 @@ public class MclJNI {
   public final static native String Fr_toString__SWIG_0(long jarg1, Fr jarg1_, int jarg2);
   public final static native String Fr_toString__SWIG_1(long jarg1, Fr jarg1_);
   public final static native void Fr_deserialize(long jarg1, Fr jarg1_, byte[] jarg2);
+  public final static native byte[] Fr_serialize(long jarg1, Fr jarg1_);
   public final static native void delete_Fr(long jarg1);
   public final static native void neg__SWIG_1(long jarg1, Fp jarg1_, long jarg2, Fp jarg2_);
   public final static native void add__SWIG_1(long jarg1, Fp jarg1_, long jarg2, Fp jarg2_, long jarg3, Fp jarg3_);
@@ -55,6 +56,7 @@ public class MclJNI {
   public final static native String Fp_toString__SWIG_0(long jarg1, Fp jarg1_, int jarg2);
   public final static native String Fp_toString__SWIG_1(long jarg1, Fp jarg1_);
   public final static native void Fp_deserialize(long jarg1, Fp jarg1_, byte[] jarg2);
+  public final static native byte[] Fp_serialize(long jarg1, Fp jarg1_);
   public final static native void delete_Fp(long jarg1);
   public final static native void neg__SWIG_2(long jarg1, G1 jarg1_, long jarg2, G1 jarg2_);
   public final static native void dbl__SWIG_0(long jarg1, G1 jarg1_, long jarg2, G1 jarg2_);
@@ -73,6 +75,7 @@ public class MclJNI {
   public final static native String G1_toString__SWIG_0(long jarg1, G1 jarg1_, int jarg2);
   public final static native String G1_toString__SWIG_1(long jarg1, G1 jarg1_);
   public final static native void G1_deserialize(long jarg1, G1 jarg1_, byte[] jarg2);
+  public final static native byte[] G1_serialize(long jarg1, G1 jarg1_);
   public final static native void delete_G1(long jarg1);
   public final static native void neg__SWIG_3(long jarg1, G2 jarg1_, long jarg2, G2 jarg2_);
   public final static native void dbl__SWIG_1(long jarg1, G2 jarg1_, long jarg2, G2 jarg2_);
@@ -90,6 +93,7 @@ public class MclJNI {
   public final static native String G2_toString__SWIG_0(long jarg1, G2 jarg1_, int jarg2);
   public final static native String G2_toString__SWIG_1(long jarg1, G2 jarg1_);
   public final static native void G2_deserialize(long jarg1, G2 jarg1_, byte[] jarg2);
+  public final static native byte[] G2_serialize(long jarg1, G2 jarg1_);
   public final static native void delete_G2(long jarg1);
   public final static native void mul__SWIG_6(long jarg1, GT jarg1_, long jarg2, GT jarg2_, long jarg3, GT jarg3_);
   public final static native long new_GT__SWIG_0();
@@ -100,5 +104,7 @@ public class MclJNI {
   public final static native void GT_setStr__SWIG_1(long jarg1, GT jarg1_, String jarg2);
   public final static native String GT_toString__SWIG_0(long jarg1, GT jarg1_, int jarg2);
   public final static native String GT_toString__SWIG_1(long jarg1, GT jarg1_);
+  public final static native void GT_deserialize(long jarg1, GT jarg1_, byte[] jarg2);
+  public final static native byte[] GT_serialize(long jarg1, GT jarg1_);
   public final static native void delete_GT(long jarg1);
 }
diff --git a/ffi/java/mcl.i b/ffi/java/mcl.i
index 6649ca7..1b1c1cd 100644
--- a/ffi/java/mcl.i
+++ b/ffi/java/mcl.i
@@ -11,18 +11,19 @@
 
 %}
 
-%include "mcl_impl.hpp"
-
-%javaconst(1);
-#define BN254 0
-#define BLS12_381 5
-
 %typemap(jtype) void serialize "byte[]"
 %typemap(jstype) void serialize "byte[]"
 %typemap(jni) void serialize "jbyteArray"
 %typemap(javaout) void serialize { return $jnicall; }
-%typemap(in, numinputs=0) std::string& out (std::string temp) "$1=&temp;"
+%typemap(in, numinputs=0) std::string& out (std::string buf) "$1=&buf;"
 %typemap(argout) std::string& out {
   $result = JCALL1(NewByteArray, jenv, $1->size());
   JCALL4(SetByteArrayRegion, jenv, $result, 0, $1->size(), (const jbyte*)$1->c_str());
 }
+
+%include "mcl_impl.hpp"
+
+%javaconst(1);
+#define BN254 0
+#define BLS12_381 5
+
diff --git a/ffi/java/mcl_impl.hpp b/ffi/java/mcl_impl.hpp
index 8edb656..76f4ff9 100644
--- a/ffi/java/mcl_impl.hpp
+++ b/ffi/java/mcl_impl.hpp
@@ -15,6 +15,23 @@ void SystemInit(int curveType) throw(std::exception)
 	mcl::bn::initPairing(cp);
 }
 
+template<class T>
+void deserializeT(T& x, const char *cbuf, size_t bufSize)
+{
+	if (x.deserialize(cbuf, bufSize) == 0) {
+		throw std::runtime_error("deserialize");
+	}
+}
+
+template<class T>
+void serializeT(std::string& out, const T& x)
+{
+	out.resize(48 * 12);
+	size_t n = x.serialize(&out[0], out.size());
+	if (n == 0) throw std::runtime_error("serializeT");
+	out.resize(n);
+}
+
 class G1;
 class G2;
 class GT;
@@ -63,9 +80,11 @@ public:
 	}
 	void deserialize(const char *cbuf, size_t bufSize) throw(std::exception)
 	{
-		if (self_.deserialize(cbuf, bufSize) == 0) {
-			throw std::runtime_error("deserialize");
-		}
+		deserializeT(self_, cbuf, bufSize);
+	}
+	void serialize(std::string& out) const throw(std::exception)
+	{
+		serializeT(out, self_);
 	}
 };
 
@@ -136,9 +155,11 @@ public:
 	}
 	void deserialize(const char *cbuf, size_t bufSize) throw(std::exception)
 	{
-		if (self_.deserialize(cbuf, bufSize) == 0) {
-			throw std::runtime_error("deserialize");
-		}
+		deserializeT(self_, cbuf, bufSize);
+	}
+	void serialize(std::string& out) const throw(std::exception)
+	{
+		serializeT(out, self_);
 	}
 };
 
@@ -207,9 +228,11 @@ public:
 	}
 	void deserialize(const char *cbuf, size_t bufSize) throw(std::exception)
 	{
-		if (self_.deserialize(cbuf, bufSize) == 0) {
-			throw std::runtime_error("deserialize");
-		}
+		deserializeT(self_, cbuf, bufSize);
+	}
+	void serialize(std::string& out) const throw(std::exception)
+	{
+		serializeT(out, self_);
 	}
 };
 
@@ -275,9 +298,11 @@ public:
 	}
 	void deserialize(const char *cbuf, size_t bufSize) throw(std::exception)
 	{
-		if (self_.deserialize(cbuf, bufSize) == 0) {
-			throw std::runtime_error("deserialize");
-		}
+		deserializeT(self_, cbuf, bufSize);
+	}
+	void serialize(std::string& out) const throw(std::exception)
+	{
+		serializeT(out, self_);
 	}
 };
 
@@ -326,6 +351,14 @@ public:
 	{
 		return self_.getStr(base);
 	}
+	void deserialize(const char *cbuf, size_t bufSize) throw(std::exception)
+	{
+		deserializeT(self_, cbuf, bufSize);
+	}
+	void serialize(std::string& out) const throw(std::exception)
+	{
+		serializeT(out, self_);
+	}
 };
 
 void mul(GT& z, const GT& x, const GT& y)
diff --git a/ffi/java/mcl_wrap.cxx b/ffi/java/mcl_wrap.cxx
index f9a36a7..4999bca 100644
--- a/ffi/java/mcl_wrap.cxx
+++ b/ffi/java/mcl_wrap.cxx
@@ -788,6 +788,33 @@ SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_Fr_1deserialize(JNIEnv *jenv,
 }
 
 
+SWIGEXPORT jbyteArray JNICALL Java_com_herumi_mcl_MclJNI_Fr_1serialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_) {
+  jbyteArray jresult = 0 ;
+  Fr *arg1 = (Fr *) 0 ;
+  std::string *arg2 = 0 ;
+  std::string buf2 ;
+  
+  (void)jenv;
+  (void)jcls;
+  arg2=&buf2;
+  (void)jarg1_;
+  arg1 = *(Fr **)&jarg1; 
+  try {
+    ((Fr const *)arg1)->serialize(*arg2);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return 0;
+  }
+  
+  {
+    jresult = jenv->NewByteArray(arg2->size());
+    jenv->SetByteArrayRegion(jresult, 0, arg2->size(), (const jbyte*)arg2->c_str());
+  }
+  return jresult;
+}
+
+
 SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_delete_1Fr(JNIEnv *jenv, jclass jcls, jlong jarg1) {
   Fr *arg1 = (Fr *) 0 ;
   
@@ -1322,6 +1349,33 @@ SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_Fp_1deserialize(JNIEnv *jenv,
 }
 
 
+SWIGEXPORT jbyteArray JNICALL Java_com_herumi_mcl_MclJNI_Fp_1serialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_) {
+  jbyteArray jresult = 0 ;
+  Fp *arg1 = (Fp *) 0 ;
+  std::string *arg2 = 0 ;
+  std::string buf2 ;
+  
+  (void)jenv;
+  (void)jcls;
+  arg2=&buf2;
+  (void)jarg1_;
+  arg1 = *(Fp **)&jarg1; 
+  try {
+    ((Fp const *)arg1)->serialize(*arg2);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return 0;
+  }
+  
+  {
+    jresult = jenv->NewByteArray(arg2->size());
+    jenv->SetByteArrayRegion(jresult, 0, arg2->size(), (const jbyte*)arg2->c_str());
+  }
+  return jresult;
+}
+
+
 SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_delete_1Fp(JNIEnv *jenv, jclass jcls, jlong jarg1) {
   Fp *arg1 = (Fp *) 0 ;
   
@@ -1766,6 +1820,33 @@ SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_G1_1deserialize(JNIEnv *jenv,
 }
 
 
+SWIGEXPORT jbyteArray JNICALL Java_com_herumi_mcl_MclJNI_G1_1serialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_) {
+  jbyteArray jresult = 0 ;
+  G1 *arg1 = (G1 *) 0 ;
+  std::string *arg2 = 0 ;
+  std::string buf2 ;
+  
+  (void)jenv;
+  (void)jcls;
+  arg2=&buf2;
+  (void)jarg1_;
+  arg1 = *(G1 **)&jarg1; 
+  try {
+    ((G1 const *)arg1)->serialize(*arg2);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return 0;
+  }
+  
+  {
+    jresult = jenv->NewByteArray(arg2->size());
+    jenv->SetByteArrayRegion(jresult, 0, arg2->size(), (const jbyte*)arg2->c_str());
+  }
+  return jresult;
+}
+
+
 SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_delete_1G1(JNIEnv *jenv, jclass jcls, jlong jarg1) {
   G1 *arg1 = (G1 *) 0 ;
   
@@ -2209,6 +2290,33 @@ SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_G2_1deserialize(JNIEnv *jenv,
 }
 
 
+SWIGEXPORT jbyteArray JNICALL Java_com_herumi_mcl_MclJNI_G2_1serialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_) {
+  jbyteArray jresult = 0 ;
+  G2 *arg1 = (G2 *) 0 ;
+  std::string *arg2 = 0 ;
+  std::string buf2 ;
+  
+  (void)jenv;
+  (void)jcls;
+  arg2=&buf2;
+  (void)jarg1_;
+  arg1 = *(G2 **)&jarg1; 
+  try {
+    ((G2 const *)arg1)->serialize(*arg2);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return 0;
+  }
+  
+  {
+    jresult = jenv->NewByteArray(arg2->size());
+    jenv->SetByteArrayRegion(jresult, 0, arg2->size(), (const jbyte*)arg2->c_str());
+  }
+  return jresult;
+}
+
+
 SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_delete_1G2(JNIEnv *jenv, jclass jcls, jlong jarg1) {
   G2 *arg1 = (G2 *) 0 ;
   
@@ -2416,6 +2524,66 @@ SWIGEXPORT jstring JNICALL Java_com_herumi_mcl_MclJNI_GT_1toString_1_1SWIG_11(JN
 }
 
 
+SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_GT_1deserialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_, jbyteArray jarg2) {
+  GT *arg1 = (GT *) 0 ;
+  char *arg2 = (char *) 0 ;
+  size_t arg3 ;
+  
+  (void)jenv;
+  (void)jcls;
+  (void)jarg1_;
+  arg1 = *(GT **)&jarg1; 
+  {
+    if (jarg2) {
+      arg2 = (char *) jenv->GetByteArrayElements(jarg2, 0);
+      arg3 = (size_t) jenv->GetArrayLength(jarg2);
+    } else {
+      arg2 = 0;
+      arg3 = 0;
+    }
+  }
+  try {
+    (arg1)->deserialize((char const *)arg2,arg3);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return ;
+  }
+  
+  {
+    if (jarg2) jenv->ReleaseByteArrayElements(jarg2, (jbyte *)arg2, 0);
+  }
+  
+}
+
+
+SWIGEXPORT jbyteArray JNICALL Java_com_herumi_mcl_MclJNI_GT_1serialize(JNIEnv *jenv, jclass jcls, jlong jarg1, jobject jarg1_) {
+  jbyteArray jresult = 0 ;
+  GT *arg1 = (GT *) 0 ;
+  std::string *arg2 = 0 ;
+  std::string buf2 ;
+  
+  (void)jenv;
+  (void)jcls;
+  arg2=&buf2;
+  (void)jarg1_;
+  arg1 = *(GT **)&jarg1; 
+  try {
+    ((GT const *)arg1)->serialize(*arg2);
+  }
+  catch(std::exception &_e) {
+    SWIG_JavaThrowException(jenv, SWIG_JavaRuntimeException, (&_e)->what());
+    return 0;
+  }
+  
+  {
+    jresult = jenv->NewByteArray(arg2->size());
+    jenv->SetByteArrayRegion(jresult, 0, arg2->size(), (const jbyte*)arg2->c_str());
+  }
+  return jresult;
+}
+
+
 SWIGEXPORT void JNICALL Java_com_herumi_mcl_MclJNI_delete_1GT(JNIEnv *jenv, jclass jcls, jlong jarg1) {
   GT *arg1 = (GT *) 0 ;
   
diff --git a/ffi/java/run-mcl.bat b/ffi/java/run-mcl.bat
index 903876e..f3c39ca 100644
--- a/ffi/java/run-mcl.bat
+++ b/ffi/java/run-mcl.bat
@@ -1,9 +1,9 @@
 @echo off
-echo [[compile Bn256Test.java]]
-%JAVA_DIR%\bin\javac Bn256Test.java
+echo [[compile MclTest.java]]
+%JAVA_DIR%\bin\javac MclTest.java
 
-echo [[run Bn256Test]]
+echo [[run MclTest]]
 set TOP_DIR=..\..
 pushd %TOP_DIR%\bin
-%JAVA_DIR%\bin\java -classpath ../ffi/java Bn256Test %1 %2 %3 %4 %5 %6
+%JAVA_DIR%\bin\java -classpath ../ffi/java MclTest %1 %2 %3 %4 %5 %6
 popd