java: change spec. of pack methods in several template classes as follow: If user passes null object to the pack method, MessageTypeException is thrown.

java/src/main/java/org/msgpack/template/BigIntegerTemplate.java

@@ -25,7 +25,11 @@ public class BigIntegerTemplate implements Template {
 	private BigIntegerTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packBigInteger((BigInteger)target);
+		try {
+			pk.packBigInteger((BigInteger)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/BooleanTemplate.java

@@ -24,7 +24,11 @@ public class BooleanTemplate implements Template {
 	private BooleanTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packBoolean((Boolean)target);
+		try {
+			pk.packBoolean((Boolean)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/ByteArrayTemplate.java

@@ -24,7 +24,11 @@ public class ByteArrayTemplate implements Template {
 	private ByteArrayTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packByteArray((byte[])target);
+		try {
+			pk.packByteArray((byte[])target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/ByteBufferTemplate.java

@@ -26,11 +26,14 @@ public class ByteBufferTemplate implements Template {
 	}
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.pack((ByteBuffer) target);
+		try {
+			pk.packByteBuffer((ByteBuffer) target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
-	public Object unpack(Unpacker pac, Object to) throws IOException,
+	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {
-			MessageTypeException {
 		return pac.unpackByteBuffer();
 	}
 

java/src/main/java/org/msgpack/template/DoubleTemplate.java

@@ -24,7 +24,11 @@ public class DoubleTemplate implements Template {
 	private DoubleTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packDouble(((Double)target));
+		try {
+			pk.packDouble(((Double)target));
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/FloatTemplate.java

@@ -24,7 +24,11 @@ public class FloatTemplate implements Template {
 	private FloatTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packFloat((Float)target);
+		try {
+			pk.packFloat((Float)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/IntegerTemplate.java

@@ -24,7 +24,11 @@ public class IntegerTemplate implements Template {
 	private IntegerTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packInt((Integer)target);
+		try {
+			pk.packInt((Integer)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/LongTemplate.java

@@ -24,7 +24,11 @@ public class LongTemplate implements Template {
 	private LongTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packLong((Long)target);
+		try {
+			pk.packLong((Long)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {

java/src/main/java/org/msgpack/template/StringTemplate.java

@@ -24,7 +24,11 @@ public class StringTemplate implements Template {
 	private StringTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packString((String)target);
+		try {
+			pk.packString((String)target);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 	}
 
 	public Object unpack(Unpacker pac, Object to) throws IOException, MessageTypeException {