diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..82a8a25b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+libsvm.so.2
+svm-predict
+svm-scale
+svm-train
+svm.o
+*.class
+*.jar
\ No newline at end of file
diff --git a/java/Makefile b/java/Makefile
index 08d31bd3..177f641f 100644
--- a/java/Makefile
+++ b/java/Makefile
@@ -5,7 +5,7 @@ FILES = libsvm/svm.class libsvm/svm_model.class libsvm/svm_node.class \
 		svm_train.class svm_predict.class svm_toy.class svm_scale.class
 
 #JAVAC = jikes
-JAVAC_FLAGS = -target 1.5 -source 1.5
+JAVAC_FLAGS = -target 1.7 -source 1.7
 JAVAC = javac
 # JAVAC_FLAGS =
 
diff --git a/java/libsvm.jar b/java/libsvm.jar
index 3fa0d4de..b35efbf8 100644
Binary files a/java/libsvm.jar and b/java/libsvm.jar differ
diff --git a/java/libsvm/svm.java b/java/libsvm/svm.java
index e5f2dd59..d1db7bae 100644
--- a/java/libsvm/svm.java
+++ b/java/libsvm/svm.java
@@ -1895,7 +1895,7 @@ private static void svm_group_classes(svm_problem prob, int[] nr_class_ret, int[
 		//
 		// Labels are ordered by their first occurrence in the training set. 
 		// However, for two-class sets with -1/+1 labels and -1 appears first, 
-		// we swap labels to ensure that internally the binary SVM has positive data corresponding to the +1 instances.
+		// we do { _=; =; =_;} while(false) labels to ensure that internally the binary SVM has positive data corresponding to the +1 instances.
 		//
 		if (nr_class == 2 && label[0] == -1 && label[1] == +1)
 		{
diff --git a/java/libsvm/svm.m4 b/java/libsvm/svm.m4
index 028b63c6..0074bc0a 100644
--- a/java/libsvm/svm.m4
+++ b/java/libsvm/svm.m4
@@ -2,7 +2,7 @@ define(`swap',`do {$1 _=$2; $2=$3; $3=_;} while(false)')
 define(`Qfloat',`float')
 define(`SIZE_OF_QFLOAT',4)
 define(`TAU',1e-12)
-changecom(`//', )
+changecom(`//', ` ')
 package libsvm;
 import java.io.*;
 import java.util.*;