From e99ab0d1dd2b5c860d315b9ddf7a8a59567fd630 Mon Sep 17 00:00:00 2001
From: yanqingmen <toofooltosay@gmail.com>
Date: Mon, 6 Jul 2015 20:56:17 +0800
Subject: [PATCH] minor fix

---
 .../xgboost4j/src/main/java/org/dmlc/xgboost4j/Booster.java | 6 ++++--
 .../xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java | 3 +++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/Booster.java b/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/Booster.java
index 0f296241b..4d34f43c6 100644
--- a/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/Booster.java
+++ b/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/Booster.java
@@ -76,14 +76,16 @@ public final class Booster {
      * @throws org.dmlc.xgboost4j.util.XgboostError
      */
     public Booster(Iterable<Entry<String, Object>> params, String modelPath) throws XgboostError {
-        long[] out = new long[1];
         init(null);
+        if(modelPath == null) {
+            throw new NullPointerException("modelPath : null");
+        }
         loadModel(modelPath);
         setParam("seed","0");
         setParams(params);
     }
     
-  
+ 
     
     
     private void init(DMatrix[] dMatrixs) throws XgboostError {
diff --git a/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java b/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java
index b056cad09..6beae9c90 100644
--- a/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java
+++ b/java/xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java
@@ -55,6 +55,9 @@ public class DMatrix {
      * @throws org.dmlc.xgboost4j.util.XgboostError 
      */
     public DMatrix(String dataPath) throws XgboostError {
+        if(dataPath == null) {
+            throw new NullPointerException("dataPath: null");
+        }
         long[] out = new long[1];
         ErrorHandle.checkCall(XgboostJNI.XGDMatrixCreateFromFile(dataPath, 1, out));
         handle = out[0];