Make use of NIO StandardCharsets
diff --git a/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/ServerLogin.java b/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/ServerLogin.java
index a1fd5c0..57f6ce4 100644
--- a/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/ServerLogin.java
+++ b/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/ServerLogin.java
@@ -18,6 +18,7 @@
 import java.nio.ByteBuffer;
 import java.nio.CharBuffer;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.security.Key;
 import java.util.Arrays;
 
@@ -116,7 +117,7 @@
 	private void process(final Callback[] callbacks, final int mode, final Key key) throws Exception {
 		final Cipher with= Cipher.getInstance("RSA");
 		with.init(mode, key);
-		final Charset charset= Charset.forName("UTF-8");
+		final Charset charset= StandardCharsets.UTF_8;
 		
 		for (int i= 0; i < callbacks.length; i++) {
 			if (callbacks[i] instanceof PasswordCallback) {
diff --git a/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/srvext/auth/SimpleNamePassAuthMethod.java b/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/srvext/auth/SimpleNamePassAuthMethod.java
index 1a86228..f869e72 100644
--- a/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/srvext/auth/SimpleNamePassAuthMethod.java
+++ b/core/org.eclipse.statet.rj.server/src/org/eclipse/statet/rj/server/srvext/auth/SimpleNamePassAuthMethod.java
@@ -19,6 +19,7 @@
 import java.io.IOException;
 import java.nio.CharBuffer;
 import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
 import java.security.MessageDigest;
 import java.security.SecureRandom;
 import java.util.Arrays;
@@ -65,7 +66,7 @@
 			final SecureRandom random= SecureRandom.getInstance("SHA1PRNG");
 			random.nextBytes(this.digestSash);
 			this.digestService= MessageDigest.getInstance("SHA-512");
-			this.digestCharset= Charset.forName("UTF-8");
+			this.digestCharset= StandardCharsets.UTF_8;
 		}
 		catch (final Exception e) {
 			throw new RjException("", e);