Code clean-up

- Fix the inspector warnings
- Fix the infinite recursion in SslContext.newClientContext()
- Fix Javadoc errors

handler/src/main/java/io/netty/handler/ssl/CipherSuiteFilter.java

@@ -15,6 +15,7 @@
  */
 package io.netty.handler.ssl;
 
+import javax.net.ssl.SSLEngine;
 import java.util.List;
 import java.util.Set;
 

handler/src/main/java/io/netty/handler/ssl/JdkApplicationProtocolNegotiator.java

@@ -15,11 +15,10 @@
  */
 package io.netty.handler.ssl;
 
+import javax.net.ssl.SSLEngine;
 import java.util.List;
 import java.util.Set;
 
-import javax.net.ssl.SSLEngine;
-
 /**
  * JDK extension methods to support {@link ApplicationProtocolNegotiator}
  */
@@ -27,7 +26,7 @@ public interface JdkApplicationProtocolNegotiator extends ApplicationProtocolNeg
     /**
      * Abstract factory pattern for wrapping an {@link SSLEngine} object. This is useful for NPN/APLN JDK support.
      */
-    public interface SslEngineWrapperFactory {
+    interface SslEngineWrapperFactory {
         /**
          * Abstract factory pattern for wrapping an {@link SSLEngine} object. This is useful for NPN/APLN support.
          *
@@ -48,7 +47,7 @@ public interface JdkApplicationProtocolNegotiator extends ApplicationProtocolNeg
      * {@link ProtocolSelector#unsupported()} OR {@link ProtocolSelector#select(List)} will be called for each SSL
      * handshake.
      */
-    public interface ProtocolSelector {
+    interface ProtocolSelector {
         /**
          * Callback invoked to let the application know that the peer does not support this
          * {@link ApplicationProtocolNegotiator}.
@@ -72,7 +71,7 @@ public interface JdkApplicationProtocolNegotiator extends ApplicationProtocolNeg
      * {@link ProtocolSelectionListener#unsupported()} OR the {@link ProtocolSelectionListener#selected(String)} method
      * will be called for each SSL handshake.
      */
-    public interface ProtocolSelectionListener {
+    interface ProtocolSelectionListener {
         /**
          * Callback invoked to let the application know that the peer does not support this
          * {@link ApplicationProtocolNegotiator}.
@@ -93,7 +92,7 @@ public interface JdkApplicationProtocolNegotiator extends ApplicationProtocolNeg
     /**
      * Factory interface for {@link ProtocolSelector} objects.
      */
-    public interface ProtocolSelectorFactory {
+    interface ProtocolSelectorFactory {
         /**
          * Generate a new instance of {@link ProtocolSelector}.
          * @param engine The {@link SSLEngine} that the returned {@link ProtocolSelector} will be used to create an
@@ -107,7 +106,7 @@ public interface JdkApplicationProtocolNegotiator extends ApplicationProtocolNeg
     /**
      * Factory interface for {@link ProtocolSelectionListener} objects.
      */
-    public interface ProtocolSelectionListenerFactory {
+    interface ProtocolSelectionListenerFactory {
         /**
          * Generate a new instance of {@link ProtocolSelectionListener}.
          * @param engine The {@link SSLEngine} that the returned {@link ProtocolSelectionListener} will be used to

handler/src/main/java/io/netty/handler/ssl/JdkSslContext.java

@@ -16,13 +16,25 @@
 
 package io.netty.handler.ssl;
 
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.ByteBufInputStream;
+import io.netty.util.internal.EmptyArrays;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 
+import javax.crypto.Cipher;
+import javax.crypto.EncryptedPrivateKeyInfo;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLEngine;
+import javax.net.ssl.SSLSessionContext;
+import javax.net.ssl.TrustManagerFactory;
+import javax.security.auth.x500.X500Principal;
 import java.io.File;
 import java.io.IOException;
 import java.security.InvalidAlgorithmParameterException;
@@ -48,18 +60,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
-import javax.crypto.Cipher;
-import javax.crypto.EncryptedPrivateKeyInfo;
-import javax.crypto.NoSuchPaddingException;
-import javax.crypto.SecretKey;
-import javax.crypto.SecretKeyFactory;
-import javax.crypto.spec.PBEKeySpec;
-import javax.net.ssl.KeyManagerFactory;
-import javax.net.ssl.SSLContext;
-import javax.net.ssl.SSLEngine;
-import javax.net.ssl.SSLSessionContext;
-import javax.net.ssl.TrustManagerFactory;
-import javax.security.auth.x500.X500Principal;
+import static io.netty.util.internal.ObjectUtil.*;
 
 /**
  * An {@link SslContext} which uses JDK's SSL/TLS implementation.
@@ -141,8 +142,7 @@ public abstract class JdkSslContext extends SslContext {
     }
 
     private static void addIfSupported(Set<String> supported, List<String> enabled, String... names) {
-        for (int i = 0; i < names.length; ++i) {
-            String n = names[i];
+        for (String n: names) {
             if (supported.contains(n)) {
                 enabled.add(n);
             }
@@ -224,7 +224,7 @@ public abstract class JdkSslContext extends SslContext {
     }
 
     /**
-     * Translate a {@link ApplicationProtocolConfiguration} object to a {@link JdkApplicationProtocolNegotiator} object.
+     * Translate a {@link ApplicationProtocolConfig} object to a {@link JdkApplicationProtocolNegotiator} object.
      * @param config The configuration which defines the translation
      * @param isServer {@code true} if a server {@code false} otherwise.
      * @return The results of the translation
@@ -336,7 +336,7 @@ public abstract class JdkSslContext extends SslContext {
         byte[] encodedKey = new byte[encodedKeyBuf.readableBytes()];
         encodedKeyBuf.readBytes(encodedKey).release();
 
-        char[] keyPasswordChars = keyPassword == null ? new char[0] : keyPassword.toCharArray();
+        char[] keyPasswordChars = keyPassword == null ? EmptyArrays.EMPTY_CHARS : keyPassword.toCharArray();
         PKCS8EncodedKeySpec encodedKeySpec = generateKeySpec(keyPasswordChars, encodedKey);
 
         PrivateKey key;

handler/src/main/java/io/netty/handler/ssl/OpenSslServerContext.java

@@ -15,22 +15,21 @@
  */
 package io.netty.handler.ssl;
 
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
 import io.netty.buffer.ByteBufAllocator;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
+import org.apache.tomcat.jni.Pool;
+import org.apache.tomcat.jni.SSL;
+import org.apache.tomcat.jni.SSLContext;
 
+import javax.net.ssl.SSLEngine;
+import javax.net.ssl.SSLException;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-import javax.net.ssl.SSLEngine;
-import javax.net.ssl.SSLException;
-
-import org.apache.tomcat.jni.Pool;
-import org.apache.tomcat.jni.SSL;
-import org.apache.tomcat.jni.SSLContext;
+import static io.netty.util.internal.ObjectUtil.*;
 
 /**
  * A server-side {@link SslContext} which uses OpenSSL's SSL/TLS implementation.
@@ -360,7 +359,7 @@ public final class OpenSslServerContext extends SslContext {
     }
 
     /**
-     * Translate a {@link ApplicationProtocolConfiguration} object to a
+     * Translate a {@link ApplicationProtocolConfig} object to a
      * {@link OpenSslApplicationProtocolNegotiator} object.
      * @param config The configuration which defines the translation
      * @param isServer {@code true} if a server {@code false} otherwise.

handler/src/main/java/io/netty/handler/ssl/SslContext.java

@@ -20,9 +20,6 @@ import io.netty.buffer.ByteBufAllocator;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelPipeline;
 
-import java.io.File;
-import java.util.List;
-
 import javax.net.ssl.KeyManager;
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
@@ -30,6 +27,8 @@ import javax.net.ssl.SSLEngine;
 import javax.net.ssl.SSLException;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.TrustManagerFactory;
+import java.io.File;
+import java.util.List;
 
 /**
  * A secure socket protocol implementation which acts as a factory for {@link SSLEngine} and {@link SslHandler}.

handler/src/main/java/io/netty/handler/ssl/SupportedCipherSuiteFilter.java

@@ -15,6 +15,7 @@
  */
 package io.netty.handler.ssl;
 
+import javax.net.ssl.SSLEngine;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;