diff --git a/src/symjava/examples/BenchmarkRosenbrock.java b/src/symjava/examples/BenchmarkRosenbrock.java
index 4d14cd8..0496a6b 100644
--- a/src/symjava/examples/BenchmarkRosenbrock.java
+++ b/src/symjava/examples/BenchmarkRosenbrock.java
@@ -113,33 +113,40 @@ public static double test(int N) {
 		
 		int NN = 100000;
 		outAry = new double[N];
+		double checkSumGrad = 0.0;
+		double xx = 1.0;
 		begin = System.currentTimeMillis();
-		double out = 0.0;
 		for(int j=0; j<NN; j++) {
-			for(int k=0; k<N; k++)
-				args[k] += 1e-15;
+			for(int k=0; k<N; k++) {
+				xx += 1e-15;
+				args[k] = xx;
+			}
 			numGrad.eval(outAry, args);
 			for(int k=0; k<N; k++)
-				out += outAry[k];
+				checkSumGrad += outAry[k];
 		}
 		end = System.currentTimeMillis();
 		double timeGradEval = (end-begin)/1000.0;
 		
 		outAry = new double[N*N];
+		double checkSumHess = 0.0;
+		xx = 1.0;
 		begin = System.currentTimeMillis();
 		for(int j=0; j<NN; j++) {
-			for(int k=0; k<N; k++)
-				args[k] += 1e-15;
+			for(int k=0; k<N; k++) {
+				xx += 1e-15;
+				args[k] = xx;
+			}
 			numHess.eval(outAry, args);
 			for(int k=0; k<N; k++) //Trace
-				out += outAry[k*N+k];
+				checkSumHess += outAry[k*N+k];
 		}
 		end = System.currentTimeMillis();
 		double timeHessEval = (end-begin)/1000.0;
 
-		System.out.println(N+"\t"+timeSym+"\t"+timeGrad+"\t"+timeGradEval+"\t"+timeHess+"\t"+timeHessEval+"\t"+timeCCompile);
+		System.out.println(N+"\t"+timeSym+"\t"+timeGrad+"\t"+timeGradEval+"\t"+timeHess+"\t"+timeHessEval+"\t"+checkSumGrad+"\t"+checkSumHess+"\t"+timeCCompile);
 
-		return out;
+		return checkSumGrad;
 	}
 	
 	public static void print_header(PrintWriter writer) {
@@ -176,42 +183,48 @@ public static void print_main(PrintWriter writer, int N) {
 		writer.println("	double durationGrad, durationHess;");
 		writer.println("	int N = 100000;");
 		writer.println("	double *args, *outAry;");
-		writer.println("	double out = 0.0;");
+		writer.println("	double checkSumGrad = 0.0;");
+		writer.println("	double checkSumHess = 0.0;");
+		writer.println("	double xx = 1.0;");
+		writer.println();
+		writer.println("	args = new double["+N+"];");
+		writer.println("	//for(int i=0; i<"+N+"; i++)");
+		writer.println("	//	args[i] = 1.0;");
+		writer.println("	outAry = new double["+(N*N)+"];");
+		writer.println("	xx = 1.0;");
+		writer.println("	start = std::clock();");
+		writer.println("	for(int i=0; i<N; i++) {");
+		writer.println("		for(int j=0; j<"+N+"; j++) {");
+		writer.println("			xx += 1e-15;");
+		writer.println("			args[j] = xx;");
+		writer.println("		}");
+		writer.println("		grad_"+N+"(args, outAry);");
+		writer.println("		for(int j=0; j<"+N+"; j++) {");
+		writer.println("			checkSumGrad += outAry[j];");
+		writer.println("		}");
+		writer.println("	}");
+		writer.println("	durationGrad = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;");
+		writer.println("	xx = 1.0;");
+		writer.println("	start = std::clock();");
+		writer.println("	for(int i=0; i<N; i++) {");
+		writer.println("		for(int j=0; j<"+N+"; j++) {");
+		writer.println("			xx += 1e-15;");
+		writer.println("			args[j] = xx;");
+		writer.println("		}");
+		writer.println("		hess_"+N+"(args, outAry);");
+//		writer.println("		for(int j=0; j<"+N+"*"+N+"; j++) {");
+		writer.println("		for(int j=0; j<"+N+"; j++) {");
+		writer.println("			checkSumHess += outAry[j*"+N+"+j];");
+		writer.println("		}");
+		writer.println("	}");
+		writer.println("	durationHess = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;");
+		writer.println("	cout.precision(6);");
+		writer.println("	cout<<\"N="+N+": Grad=\"<< durationGrad << \" Hess=\" << durationHess;");
+		writer.println("	cout.precision(17);");
+		writer.println("	cout<<  \" Grad CheckSum=\" << checkSumGrad <<  \" Hess CheckSum=\" << checkSumHess << endl;");
+		writer.println("	delete args;");
+		writer.println("	delete outAry;");
 		writer.println();
-			writer.println("	args = new double["+N+"];");
-			writer.println("	for(int i=0; i<"+N+"; i++)");
-			writer.println("		args[i] = 1.0;");
-			writer.println("	outAry = new double["+(N*N)+"];");
-			writer.println("	start = std::clock();");
-			writer.println("	for(int i=0; i<N; i++) {");
-			writer.println("		for(int j=0; j<"+N+"; j++) {");
-			writer.println("			args[j] += 1e-15;");
-			writer.println("		}");
-			writer.println("		grad_"+N+"(args, outAry);");
-			writer.println("		for(int j=0; j<"+N+"; j++) {");
-			writer.println("			out += outAry[j];");
-			writer.println("		}");
-//			writer.println("		out += outAry["+(N-1)+"];");
-			writer.println("	}");
-			writer.println("	durationGrad = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;");
-			writer.println("	start = std::clock();");
-			writer.println("	for(int i=0; i<N; i++) {");
-			writer.println("		for(int j=0; j<"+N+"; j++) {");
-			writer.println("			args[j] += 1e-15;");
-			writer.println("		}");
-			writer.println("		hess_"+N+"(args, outAry);");
-//			writer.println("		for(int j=0; j<"+N+"*"+N+"; j++) {");
-			writer.println("		for(int j=0; j<"+N+"; j++) {");
-			writer.println("			out += outAry[j*"+N+"+j];");
-			writer.println("		}");
-//			writer.println("		out += outAry["+(N*N-1)+"];");
-			writer.println("	}");
-			writer.println("	durationHess = ( std::clock() - start ) / (double) CLOCKS_PER_SEC;");
-			writer.println("	cout<<\"N="+N+": Grad=\"<< durationGrad << \" Hess=\" << durationHess << endl;");
-			writer.println("	delete args;");
-			writer.println("	delete outAry;");
-			writer.println();
-		writer.println("	cout<<\" Final Value=\" << out << endl;");
 		writer.println("}");
 		writer.println("//g++ -O3 benchmark-rosenbrock-manual.cpp -o run");
 	}
@@ -260,13 +273,9 @@ public static void print_c_code(PrintWriter pw, SymMatrix hess) {
 	
 	public static void main(String[] args) {
 		System.out.println("============Benchmark for Rosenbrock==============");
-		System.out.println("N|Symbolic Manipulaton|Compile Gradient|Eval Gradient|Compile Hessian|Eval Hessian|C Code Compile");
-		double out = 0.0;
-		for(int N=5; N<850; N+=50) {
-			double tmp = test(N);
-			System.out.println("Final Value="+tmp);
-			out += tmp;
-		}
-		System.out.println("Final Value="+out);//6.881736000015767E11
+		System.out.println("N|Symbolic Manipulaton|Compile Gradient|Eval Gradient|Compile Hessian|Eval Hessian|Grad CheckSum|Hess CheckSum|C Code Compile");
+		for(int N=5; N<850; N+=50)
+			test(N);
+		//test(5000);//Exception in thread "main" java.lang.OutOfMemoryError: GC overhead limit exceeded
 	}
 }
diff --git a/src/symjava/examples/BenchmarkSqrt.java b/src/symjava/examples/BenchmarkSqrt.java
index add896e..ddbcdc6 100644
--- a/src/symjava/examples/BenchmarkSqrt.java
+++ b/src/symjava/examples/BenchmarkSqrt.java
@@ -46,13 +46,13 @@ public static void test() {
 		}
 		
 		int N=10000000;
-		double x = 0.1;
+		double xx = 0.1;
 		double out = 0.0;
 		for(int i=0; i<funcs.size(); i++) {
 			long begin = System.currentTimeMillis();
 			for(int j=0; j<N; j++) {
-				x += 1e-15;
-				out += funcs.get(i).apply(x);
+				xx += 1e-15;
+				out += funcs.get(i).apply(xx);
 			}
 			long end = System.currentTimeMillis();
 			System.out.println("Time: "+((end-begin)/1000.0)+" expr="+exprs.get(i));
@@ -87,13 +87,13 @@ public static void testBatchEval() {
 		
 		int N=10000000/batchLen;
 		double out = 0.0;
-		double x = 0.1;
+		double xx = 0.1;
 		for(int i=0; i<funcs.size(); i++) {
 			long begin = System.currentTimeMillis();
 			for(int j=0; j<N; j++) {
 				for(int k=0; k<batchLen; k++) {
-					x += 1e-15;
-					args[k] = x;
+					xx += 1e-15;
+					args[k] = xx;
 				}
 				funcs.get(i).apply(outAry, 0, args);
 				for(int k=0; k<batchLen; k++)
diff --git a/src/symjava/examples/BenchmarkTaylor.java b/src/symjava/examples/BenchmarkTaylor.java
index b5843ed..a7d7ab6 100644
--- a/src/symjava/examples/BenchmarkTaylor.java
+++ b/src/symjava/examples/BenchmarkTaylor.java
@@ -45,13 +45,13 @@ public static void test() {
 		}
 		
 		int N=10000000;
-		double x = 0.1;
+		double xx = 0.1;
 		double out = 0.0;
 		for(int i=0; i<funcs.size(); i++) {
 			long begin = System.currentTimeMillis();
 			for(int j=0; j<N; j++) {
-				x += 1e-15;
-				out += funcs.get(i).apply(x);
+				xx += 1e-15;
+				out += funcs.get(i).apply(xx);
 			}
 			long end = System.currentTimeMillis();
 			System.out.println("Time: "+((end-begin)/1000.0)+" expr="+exprs.get(i));
@@ -85,13 +85,13 @@ public static void testBatchEval() {
 		
 		int N=10000000/batchLen;
 		double out = 0.0;
-		double x = 0.1;
+		double xx = 0.1;
 		for(int i=0; i<funcs.size(); i++) {
 			long begin = System.currentTimeMillis();
 			for(int j=0; j<N; j++) {
 				for(int k=0; k<batchLen; k++) {
-					x += 1e-15;
-					args[k] = x;
+					xx += 1e-15;
+					args[k] = xx;
 				}
 				funcs.get(i).apply(outAry, 0, args);
 				for(int k=0; k<batchLen; k++)
diff --git a/src/symjava/examples/Example2.java b/src/symjava/examples/Example2.java
index 14db044..c1b6e02 100644
--- a/src/symjava/examples/Example2.java
+++ b/src/symjava/examples/Example2.java
@@ -65,7 +65,7 @@ public static void example2() {
 				{7 , 478.019226091914},
 				{8 , 608.140949270688},
 				{9 , 754.598868667148},
-				{10, 916.128818085883},		
+				{10, 916.128818085883},
 		};
 		
 		double[] initialGuess = {1, 1, 1};
diff --git a/src/symjava/examples/NumericalIntegration.java b/src/symjava/examples/NumericalIntegration.java
index 99ca947..7b5c04b 100644
--- a/src/symjava/examples/NumericalIntegration.java
+++ b/src/symjava/examples/NumericalIntegration.java
@@ -17,9 +17,9 @@
 public class NumericalIntegration {
 
 	public static void main(String[] args) {
-//		test_1D();
-//		test_2D();
-//		test_ND();
+		test_1D();
+		test_2D();
+		test_ND();
 		
 		//Expr i = Integrate.apply(exp(pow(x,2)), Interval.apply(a, b).setStepSize(0.001));
 		//BytecodeFunc fi = JIT.compile(new Expr[]{a,b}, i);
diff --git a/src/symjava/symbolic/utils/JIT.java b/src/symjava/symbolic/utils/JIT.java
index 939c9fd..870b55e 100644
--- a/src/symjava/symbolic/utils/JIT.java
+++ b/src/symjava/symbolic/utils/JIT.java
@@ -92,7 +92,7 @@ public static BytecodeVecFunc compile(Expr[] args, Expr[] exprs) {
 	}
 	
 	public static BytecodeBatchFunc compileBatchFunc(Expr[] args, Expr expr) {
-		String className = "JITVecFunc_YYYY"+java.util.UUID.randomUUID().toString().replaceAll("-", "");
+		String className = "JITVecFunc_YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY"+java.util.UUID.randomUUID().toString().replaceAll("-", "");
 		ClassGen genClass = BytecodeUtils.genClassBytecodeBatchFunc(className,expr, args, true, false);
 		FuncClassLoader<BytecodeBatchFunc> fcl = new FuncClassLoader<BytecodeBatchFunc>();
 		return fcl.newInstance(genClass);