Fix warnings when generating javadoc

java/xgboost4j/src/main/java/org/dmlc/xgboost4j/DMatrix.java

@@ -90,7 +90,7 @@ public class DMatrix {
      * @param data data values
      * @param nrow number of rows
      * @param ncol number of columns
-     * @throws org.dmlc.xgboost4j.util.XGBoostError Native error
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public DMatrix(float[] data, int nrow, int ncol) throws XGBoostError {
         long[] out = new long[1];
@@ -111,6 +111,7 @@ public class DMatrix {
     /**
      * set label of dmatrix
      * @param labels labels
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public void setLabel(float[] labels) throws XGBoostError {
         ErrorHandle.checkCall(XgboostJNI.XGDMatrixSetFloatInfo(handle, "label", labels));
@@ -119,7 +120,7 @@ public class DMatrix {
     /**
      * set weight of each instance
      * @param weights weights
-     * @throws org.dmlc.xgboost4j.util.XGBoostError Native error
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public void setWeight(float[] weights) throws XGBoostError {
         ErrorHandle.checkCall(XgboostJNI.XGDMatrixSetFloatInfo(handle, "weight", weights));
@@ -196,7 +197,7 @@ public class DMatrix {
     
     /**
      * Slice the DMatrix and return a new DMatrix that only contains `rowIndex`.
-     * @param rowIndex
+     * @param rowIndex row index
      * @return sliced new DMatrix
      * @throws org.dmlc.xgboost4j.util.XGBoostError Native error
      */
@@ -221,12 +222,16 @@ public class DMatrix {
     
     /**
      * save DMatrix to filePath
-     * @param filePath 
+     * @param filePath file path
      */
     public void saveBinary(String filePath) {
         XgboostJNI.XGDMatrixSaveBinary(handle, filePath, 1);
     }
     
+    /**
+     * Get the handle
+     * @return native handler id
+     */
     public long getHandle() {
         return handle;
     }

java/xgboost4j/src/main/java/org/dmlc/xgboost4j/IEvaluation.java

@@ -17,20 +17,25 @@ package org.dmlc.xgboost4j;
 
 /**
  * interface for customized evaluation
+ * 
  * @author hzx
  */
 public interface IEvaluation {
 	/**
 	 * get evaluate metric
+	 * 
 	 * @return evalMetric
 	 */
 	public abstract String getMetric();
 
 	/**
 	 * evaluate with predicts and data
+	 * 
 	 * @param predicts
+	 *            predictions as array
 	 * @param dmat
-     * @return 
+	 *            data matrix to evaluate
+	 * @return result of the metric
 	 */
 	public abstract float eval(float[][] predicts, DMatrix dmat);
 }

java/xgboost4j/src/main/java/org/dmlc/xgboost4j/util/CVPack.java

@@ -37,7 +37,7 @@ public class CVPack {
      * @param dtrain train data
      * @param dtest test data
      * @param params parameters
-     * @throws org.dmlc.xgboost4j.util.XGBoostError
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public CVPack(DMatrix dtrain, DMatrix dtest, Iterable<Map.Entry<String, Object>> params) throws XGBoostError {
         dmats = new DMatrix[] {dtrain, dtest};
@@ -50,7 +50,7 @@ public class CVPack {
     /**
      * update one iteration
      * @param iter iteration num
-     * @throws org.dmlc.xgboost4j.util.XGBoostError
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public void update(int iter) throws XGBoostError {
         booster.update(dtrain, iter);
@@ -60,7 +60,7 @@ public class CVPack {
      * update one iteration
      * @param iter iteration num
      * @param obj customized objective
-     * @throws org.dmlc.xgboost4j.util.XGBoostError
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public void update(int iter, IObjective obj) throws XGBoostError {
         booster.update(dtrain, iter, obj);
@@ -69,8 +69,8 @@ public class CVPack {
     /**
      * evaluation 
      * @param iter iteration num
-     * @return 
-     * @throws org.dmlc.xgboost4j.util.XGBoostError 
+     * @return evaluation
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public String eval(int iter) throws XGBoostError {
         return booster.evalSet(dmats, names, iter);
@@ -80,8 +80,8 @@ public class CVPack {
      * evaluation 
      * @param iter iteration num
      * @param eval customized eval
-     * @return 
-     * @throws org.dmlc.xgboost4j.util.XGBoostError 
+     * @return evaluation
+     * @throws org.dmlc.xgboost4j.util.XGBoostError native error
      */
     public String eval(int iter, IEvaluation eval) throws XGBoostError {
         return booster.evalSet(dmats, names, iter, eval);