java: throws MessagePackException if target==null on *ArrayTemplate

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

@@ -28,7 +28,11 @@ public class BooleanArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		boolean[] array = (boolean[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(boolean a : array) {
 			pk.pack(a);
 		}

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

@@ -24,7 +24,11 @@ public class ByteTemplate implements Template {
 	private ByteTemplate() { }
 
 	public void pack(Packer pk, Object target) throws IOException {
-		pk.packByte((Byte)target);
+		try {
+			pk.packByte((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/DefaultTemplate.java

@@ -42,6 +42,9 @@ public class DefaultTemplate implements Template {
 
 	public void pack(Packer pk, Object target) throws IOException {
 		if(messagePackable) {
+			if(target == null) {
+				throw new MessageTypeException("target is null.");
+			}
 			((MessagePackable)target).messagePack(pk);
 			return;
 		}

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

@@ -28,7 +28,11 @@ public class DoubleArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		double[] array = (double[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(double a : array) {
 			pk.pack(a);
 		}

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

@@ -28,7 +28,11 @@ public class FloatArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		float[] array = (float[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(float a : array) {
 			pk.pack(a);
 		}

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

@@ -28,7 +28,11 @@ public class IntArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		int[] array = (int[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(int a : array) {
 			pk.pack(a);
 		}

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

@@ -28,7 +28,11 @@ public class LongArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		long[] array = (long[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(long a : array) {
 			pk.pack(a);
 		}

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

@@ -28,7 +28,11 @@ public class ShortArrayTemplate implements Template {
 			throw new MessageTypeException();
 		}
 		short[] array = (short[])target;
-		pk.packArray(array.length);
+		try {
+			pk.packArray(array.length);
+		} catch (NullPointerException e) {
+			throw new MessageTypeException("target is null.", e);
+		}
 		for(short a : array) {
 			pk.pack(a);
 		}

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

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