diff --git a/src/zutil/parser/json/JSONObjectInputStream.java b/src/zutil/parser/json/JSONObjectInputStream.java
index f56a73b..85e7b62 100755
--- a/src/zutil/parser/json/JSONObjectInputStream.java
+++ b/src/zutil/parser/json/JSONObjectInputStream.java
@@ -24,7 +24,6 @@
 
 package zutil.parser.json;
 
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 import zutil.ClassUtil;
 import zutil.log.LogUtil;
 import zutil.parser.Base64Decoder;
@@ -250,52 +249,52 @@ public class JSONObjectInputStream extends InputStream implements ObjectInput, C
 
 
     @Override public void readFully(byte[] b) throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public void readFully(byte[] b, int off, int len) throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public int skipBytes(int n) throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public boolean readBoolean() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public byte readByte() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public int readUnsignedByte() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public short readShort() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public int readUnsignedShort() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public char readChar() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public int readInt() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public long readLong() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public float readFloat() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public double readDouble() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public String readLine() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public String readUTF() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public int read() throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
 
 }
diff --git a/src/zutil/parser/json/JSONObjectOutputStream.java b/src/zutil/parser/json/JSONObjectOutputStream.java
index b6d2bd6..1b63d8e 100755
--- a/src/zutil/parser/json/JSONObjectOutputStream.java
+++ b/src/zutil/parser/json/JSONObjectOutputStream.java
@@ -24,7 +24,6 @@
 
 package zutil.parser.json;
 
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 import zutil.ClassUtil;
 import zutil.parser.Base64Encoder;
 import zutil.parser.DataNode;
@@ -211,7 +210,7 @@ public class JSONObjectOutputStream extends OutputStream implements ObjectOutput
         out.write(new DataNode(v));
     }
     @Override public void writeByte(int v) throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public void writeShort(int v) throws IOException {
         out.write(new DataNode(v));
@@ -232,7 +231,7 @@ public class JSONObjectOutputStream extends OutputStream implements ObjectOutput
         out.write(new DataNode(v));
     }
     @Override public void writeBytes(String s) throws IOException {
-        throw new NotImplementedException();
+        throw new UnsupportedOperationException ();
     }
     @Override public void writeChars(String s) throws IOException {
         out.write(new DataNode(s));
diff --git a/src/zutil/struct/CircularBuffer.java b/src/zutil/struct/CircularBuffer.java
old mode 100644
new mode 100755
index ac94a69..c155bc2
--- a/src/zutil/struct/CircularBuffer.java
+++ b/src/zutil/struct/CircularBuffer.java
@@ -24,7 +24,6 @@
 
 package zutil.struct;
 
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 
 import java.util.Iterator;
 import java.util.NoSuchElementException;
@@ -104,7 +103,7 @@ public class CircularBuffer<T> implements Iterable<T>{
 
         @Override
         public void remove() {
-            throw new NotImplementedException();
+            throw new UnsupportedOperationException ();
         }
     }
 }