remove unused imports (#9287)

Motivation:

Some imports are not used

Modification:

remove unused imports

Result:

Code cleanup

buffer/src/test/java/io/netty/buffer/ByteBufDerivationTest.java

@@ -22,7 +22,6 @@ import java.nio.ByteOrder;
 import java.util.Random;
 
 import static org.hamcrest.Matchers.*;
-import static org.hamcrest.Matchers.sameInstance;
 import static org.junit.Assert.*;
 
 /**

codec-dns/src/main/java/io/netty/handler/codec/dns/DatagramDnsQueryEncoder.java

@@ -26,8 +26,6 @@ import io.netty.util.internal.UnstableApi;
 import java.net.InetSocketAddress;
 import java.util.List;
 
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
-
 /**
  * Encodes a {@link DatagramDnsQuery} (or an {@link AddressedEnvelope} of {@link DnsQuery}} into a
  * {@link DatagramPacket}.

codec-http/src/test/java/io/netty/handler/codec/http/multipart/HttpPostRequestEncoderTest.java

@@ -32,7 +32,6 @@ import org.junit.Test;
 
 import java.io.ByteArrayInputStream;
 import java.io.File;
-import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.List;
 

codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketClientHandshakerTest.java

@@ -32,7 +32,6 @@ import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.HttpRequestEncoder;
 import io.netty.handler.codec.http.HttpResponseDecoder;
 import io.netty.util.CharsetUtil;
-import io.netty.util.internal.PlatformDependent;
 import org.junit.Test;
 
 import java.net.URI;

codec-http2/src/main/java/io/netty/handler/codec/http2/HpackHuffmanDecoder.java

@@ -38,7 +38,6 @@ import io.netty.util.internal.ObjectUtil;
 import io.netty.util.internal.ThrowableUtil;
 
 import static io.netty.handler.codec.http2.Http2Error.COMPRESSION_ERROR;
-import static io.netty.handler.codec.http2.Http2Exception.connectionError;
 
 final class HpackHuffmanDecoder {
 

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2ServerUpgradeCodec.java

@@ -17,7 +17,6 @@ package io.netty.handler.codec.http2;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufUtil;
 import io.netty.channel.ChannelHandler;
-import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.base64.Base64;
 import io.netty.handler.codec.http.FullHttpRequest;
@@ -38,7 +37,6 @@ import static io.netty.handler.codec.http2.Http2CodecUtil.FRAME_HEADER_LENGTH;
 import static io.netty.handler.codec.http2.Http2CodecUtil.HTTP_UPGRADE_SETTINGS_HEADER;
 import static io.netty.handler.codec.http2.Http2CodecUtil.writeFrameHeader;
 import static io.netty.handler.codec.http2.Http2FrameTypes.SETTINGS;
-import static io.netty.util.internal.ObjectUtil.checkNotNull;
 
 /**
  * Server-side codec for performing a cleartext upgrade from HTTP/1.x to HTTP/2.

codec-http2/src/test/java/io/netty/handler/codec/http2/DefaultHttp2FrameWriterTest.java

@@ -37,7 +37,6 @@ import java.io.IOException;
 import java.util.Arrays;
 
 import static org.junit.Assert.*;
-import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.*;
 
 /**

codec-http2/src/test/java/io/netty/handler/codec/http2/Http2ClientUpgradeCodecTest.java

@@ -14,11 +14,9 @@
  */
 package io.netty.handler.codec.http2;
 
-import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandler;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.channel.ChannelInitializer;
 import io.netty.channel.embedded.EmbeddedChannel;
 import io.netty.handler.codec.http.DefaultFullHttpRequest;
 import io.netty.handler.codec.http.FullHttpRequest;

codec-http2/src/test/java/io/netty/handler/codec/http2/Http2MultiplexHandlerTest.java

@@ -15,7 +15,6 @@
 package io.netty.handler.codec.http2;
 
 import io.netty.channel.ChannelHandler;
-import org.junit.Ignore;
 
 /**
  * Unit tests for {@link Http2MultiplexHandler}.

codec/src/main/java/io/netty/handler/codec/serialization/CompatibleObjectEncoder.java

@@ -19,8 +19,6 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufOutputStream;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.MessageToByteEncoder;
-import io.netty.util.Attribute;
-import io.netty.util.AttributeKey;
 
 import java.io.ObjectInputStream;
 import java.io.ObjectOutputStream;

codec/src/test/java/io/netty/handler/codec/serialization/CompatibleObjectEncoderTest.java

@@ -26,7 +26,6 @@ import java.io.Serializable;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
 
 public class CompatibleObjectEncoderTest {
     @Test

common/src/main/java/io/netty/util/concurrent/DefaultPromise.java

@@ -19,7 +19,6 @@ import io.netty.util.internal.InternalThreadLocalMap;
 import io.netty.util.internal.PlatformDependent;
 import io.netty.util.internal.StringUtil;
 import io.netty.util.internal.SystemPropertyUtil;
-import io.netty.util.internal.ThrowableUtil;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 

common/src/test/java/io/netty/util/concurrent/PromiseCombinerTest.java

@@ -19,7 +19,6 @@ import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 import org.mockito.Mock;
-import org.mockito.Mockito;
 import org.mockito.MockitoAnnotations;
 import org.mockito.invocation.InvocationOnMock;
 import org.mockito.stubbing.Answer;

common/src/test/java/io/netty/util/internal/DefaultPriorityQueueTest.java

@@ -15,9 +15,7 @@
  */
 package io.netty.util.internal;
 
-import org.junit.Rule;
 import org.junit.Test;
-import org.junit.rules.ExpectedException;
 
 import java.io.Serializable;
 import java.util.ArrayList;

common/src/test/java/io/netty/util/internal/logging/Slf4JLoggerFactoryTest.java

@@ -27,7 +27,6 @@ import java.util.Iterator;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.ArgumentMatchers.*;
 import static org.mockito.Mockito.*;
 
 public class Slf4JLoggerFactoryTest {

example/src/main/java/io/netty/example/http2/helloworld/frame/server/Http2OrHttpHandler.java

@@ -18,7 +18,6 @@ import io.netty.channel.ChannelHandlerContext;
 import io.netty.example.http2.helloworld.server.HelloWorldHttp1Handler;
 import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.HttpServerCodec;
-import io.netty.handler.codec.http2.Http2FrameCodec;
 import io.netty.handler.codec.http2.Http2FrameCodecBuilder;
 import io.netty.handler.ssl.ApplicationProtocolNames;
 import io.netty.handler.ssl.ApplicationProtocolNegotiationHandler;

handler/src/test/java/io/netty/handler/ssl/ConscryptOpenSslEngineInteropTest.java

@@ -22,7 +22,7 @@ import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 
 import javax.net.ssl.SSLEngine;
-import javax.net.ssl.SSLException;
+
 import java.security.Provider;
 import java.util.ArrayList;
 import java.util.Collection;

handler/src/test/java/io/netty/handler/ssl/OpenSslJdkSslEngineInteroptTest.java

@@ -21,7 +21,7 @@ import org.junit.Ignore;
 import org.junit.Test;
 
 import javax.net.ssl.SSLEngine;
-import javax.net.ssl.SSLException;
+
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 

handler/src/test/java/io/netty/handler/ssl/PemEncodedTest.java

@@ -26,7 +26,6 @@ import java.io.File;
 import java.io.FileInputStream;
 import java.security.PrivateKey;
 
-import io.netty.buffer.Unpooled;
 import io.netty.buffer.UnpooledByteBufAllocator;
 import org.junit.Test;
 

handler/src/test/java/io/netty/handler/ssl/SniClientTest.java

@@ -29,7 +29,6 @@ import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
 import io.netty.handler.ssl.util.SelfSignedCertificate;
 import io.netty.util.Mapping;
 import io.netty.util.ReferenceCountUtil;
-import io.netty.util.ReferenceCounted;
 import io.netty.util.concurrent.Promise;
 import io.netty.util.internal.PlatformDependent;
 import org.junit.Assert;

resolver-dns/src/main/java/io/netty/resolver/dns/DnsAddressResolverGroup.java

@@ -18,7 +18,6 @@ package io.netty.resolver.dns;
 
 import io.netty.channel.ChannelFactory;
 import io.netty.channel.EventLoop;
-import io.netty.channel.ReflectiveChannelFactory;
 import io.netty.channel.socket.DatagramChannel;
 import io.netty.resolver.AddressResolver;
 import io.netty.resolver.AddressResolverGroup;

resolver-dns/src/main/java/io/netty/resolver/dns/NoopAuthoritativeDnsServerCache.java

@@ -19,8 +19,6 @@ import io.netty.channel.EventLoop;
 import io.netty.util.internal.UnstableApi;
 
 import java.net.InetSocketAddress;
-import java.util.Collections;
-import java.util.List;
 
 /**
  * A noop {@link AuthoritativeDnsServerCache} that actually never caches anything.

resolver-dns/src/main/java/io/netty/resolver/dns/ShuffledDnsServerAddressStream.java

@@ -21,7 +21,6 @@ import io.netty.util.internal.PlatformDependent;
 import java.net.InetSocketAddress;
 import java.util.Collections;
 import java.util.List;
-import java.util.Random;
 
 final class ShuffledDnsServerAddressStream implements DnsServerAddressStream {
 

resolver-dns/src/test/java/io/netty/resolver/dns/DefaultAuthoritativeDnsServerCacheTest.java

@@ -25,7 +25,6 @@ import org.junit.Test;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.util.Comparator;
-import java.util.List;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 

testsuite-http2/src/main/java/io/netty/testsuite/http2/Http2ServerInitializer.java

@@ -33,7 +33,6 @@ import io.netty.handler.codec.http.HttpServerUpgradeHandler.UpgradeCodecFactory;
 import io.netty.handler.codec.http2.CleartextHttp2ServerUpgradeHandler;
 import io.netty.handler.codec.http2.Http2CodecUtil;
 import io.netty.handler.codec.http2.Http2ServerUpgradeCodec;
-import io.netty.handler.ssl.SslContext;
 import io.netty.util.AsciiString;
 import io.netty.util.ReferenceCountUtil;
 

testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServer.java

@@ -23,9 +23,6 @@ import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.handler.logging.LogLevel;
 import io.netty.handler.logging.LoggingHandler;
-import io.netty.handler.ssl.SslContext;
-import io.netty.handler.ssl.SslContextBuilder;
-import io.netty.handler.ssl.util.SelfSignedCertificate;
 
 /**
  * An HTTP server that sends back the content of the received HTTP request

testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServerInitializer.java

@@ -20,7 +20,6 @@ import io.netty.channel.ChannelPipeline;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.handler.codec.http.HttpServerCodec;
 import io.netty.handler.codec.http.HttpServerExpectContinueHandler;
-import io.netty.handler.ssl.SslContext;
 
 public class HttpNativeServerInitializer extends ChannelInitializer<SocketChannel> {
 

testsuite/src/main/java/io/netty/testsuite/transport/socket/CompositeBufferGatheringWriteTest.java

@@ -27,7 +27,6 @@ import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
-import io.netty.channel.socket.nio.NioSocketChannel;
 import io.netty.util.ReferenceCountUtil;
 import org.junit.Test;
 

testsuite/src/main/java/io/netty/testsuite/transport/socket/SocketConnectTest.java

@@ -21,8 +21,6 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelFutureListener;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.ChannelInboundHandlerAdapter;
-import io.netty.testsuite.util.TestUtils;
-import io.netty.util.NetUtil;
 import io.netty.util.concurrent.ImmediateEventExecutor;
 import io.netty.util.concurrent.Promise;
 import org.junit.Test;

transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollChannel.java

@@ -38,7 +38,6 @@ import io.netty.channel.unix.FileDescriptor;
 import io.netty.channel.unix.Socket;
 import io.netty.channel.unix.UnixChannel;
 import io.netty.util.ReferenceCountUtil;
-import io.netty.util.internal.ThrowableUtil;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;

transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollStreamChannel.java

@@ -37,7 +37,6 @@ import io.netty.channel.unix.SocketWritableByteChannel;
 import io.netty.channel.unix.UnixChannelUtil;
 import io.netty.util.internal.PlatformDependent;
 import io.netty.util.internal.StringUtil;
-import io.netty.util.internal.ThrowableUtil;
 import io.netty.util.internal.UnstableApi;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;

transport-native-epoll/src/main/java/io/netty/channel/epoll/LinuxSocket.java

@@ -17,7 +17,6 @@ package io.netty.channel.epoll;
 
 import io.netty.channel.ChannelException;
 import io.netty.channel.DefaultFileRegion;
-import io.netty.channel.socket.DatagramChannelConfig;
 import io.netty.channel.unix.NativeInetAddress;
 import io.netty.channel.unix.PeerCredentials;
 import io.netty.channel.unix.Socket;

transport-native-epoll/src/test/java/io/netty/channel/epoll/EpollSpliceTest.java

@@ -27,7 +27,6 @@ import io.netty.channel.ChannelInboundHandlerAdapter;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.channel.unix.FileDescriptor;
-import io.netty.testsuite.util.TestUtils;
 import io.netty.util.NetUtil;
 import org.junit.Assert;
 import org.junit.Test;

transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDatagramChannel.java

@@ -42,8 +42,6 @@ import java.net.PortUnreachableException;
 import java.net.SocketAddress;
 import java.net.SocketException;
 import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.List;
 
 import static io.netty.channel.kqueue.BsdSocket.newSocketDgram;
 

transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDomainSocketChannelConfig.java

@@ -27,7 +27,6 @@ import io.netty.util.internal.UnstableApi;
 
 import java.util.Map;
 
-import static io.netty.channel.ChannelOption.ALLOW_HALF_CLOSURE;
 import static io.netty.channel.unix.UnixChannelOption.*;
 
 @UnstableApi

transport-native-kqueue/src/test/java/io/netty/channel/kqueue/KQueueETSocketAutoReadTest.java

@@ -17,7 +17,6 @@ package io.netty.channel.kqueue;
 
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
-import io.netty.buffer.ByteBufAllocator;
 import io.netty.testsuite.transport.TestsuitePermutation;
 import io.netty.testsuite.transport.socket.SocketAutoReadTest;
 

transport-native-kqueue/src/test/java/io/netty/channel/kqueue/KQueueETSocketExceptionHandlingTest.java

@@ -17,7 +17,6 @@ package io.netty.channel.kqueue;
 
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
-import io.netty.buffer.ByteBufAllocator;
 import io.netty.testsuite.transport.TestsuitePermutation;
 import io.netty.testsuite.transport.socket.SocketExceptionHandlingTest;
 

transport-native-kqueue/src/test/java/io/netty/channel/kqueue/KQueueETSocketReadPendingTest.java

@@ -17,7 +17,6 @@ package io.netty.channel.kqueue;
 
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
-import io.netty.buffer.ByteBufAllocator;
 import io.netty.testsuite.transport.TestsuitePermutation;
 import io.netty.testsuite.transport.socket.SocketReadPendingTest;
 

transport-native-kqueue/src/test/java/io/netty/channel/kqueue/KQueueSocketConnectionAttemptTest.java

@@ -16,13 +16,9 @@
 package io.netty.channel.kqueue;
 
 import io.netty.bootstrap.Bootstrap;
-import io.netty.channel.Channel;
-import io.netty.channel.ChannelInitializer;
 import io.netty.testsuite.transport.TestsuitePermutation;
 import io.netty.testsuite.transport.socket.SocketConnectionAttemptTest;
-import org.junit.Test;
 
-import java.net.InetSocketAddress;
 import java.util.List;
 
 public class KQueueSocketConnectionAttemptTest extends SocketConnectionAttemptTest {

transport/src/main/java/io/netty/channel/CoalescingBufferQueue.java

@@ -19,7 +19,6 @@ import io.netty.buffer.ByteBufAllocator;
 import io.netty.buffer.CompositeByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.util.internal.ObjectUtil;
-import io.netty.util.internal.PlatformDependent;
 
 /**
  * A FIFO queue of bytes where producers add bytes by repeatedly adding {@link ByteBuf} and consumers take bytes in

transport/src/main/java/io/netty/channel/MultithreadEventLoopGroup.java

@@ -23,7 +23,6 @@ import io.netty.util.internal.SystemPropertyUtil;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;
 
-import java.util.Queue;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ThreadFactory;
 

transport/src/main/java/io/netty/channel/PendingWriteQueue.java

@@ -18,7 +18,6 @@ package io.netty.channel;
 import io.netty.util.Recycler;
 import io.netty.util.ReferenceCountUtil;
 import io.netty.util.concurrent.PromiseCombiner;
-import io.netty.util.internal.ObjectUtil;
 import io.netty.util.internal.SystemPropertyUtil;
 import io.netty.util.internal.logging.InternalLogger;
 import io.netty.util.internal.logging.InternalLoggerFactory;

transport/src/main/java/io/netty/channel/socket/nio/NioDatagramChannel.java

@@ -33,7 +33,6 @@ import io.netty.channel.socket.InternetProtocolFamily;
 import io.netty.util.internal.SocketUtils;
 import io.netty.util.internal.PlatformDependent;
 import io.netty.util.internal.StringUtil;
-import io.netty.util.internal.UnstableApi;
 
 import java.io.IOException;
 import java.net.InetAddress;

transport/src/test/java/io/netty/channel/DelegatingChannelPromiseNotifierTest.java

@@ -20,8 +20,6 @@ import io.netty.util.concurrent.GenericFutureListener;
 import org.junit.Test;
 import org.mockito.Mockito;
 
-import static org.junit.Assert.*;
-
 public class DelegatingChannelPromiseNotifierTest {
     @Test
     public void varargsNotifiersAllowed() {

transport/src/test/java/io/netty/channel/socket/nio/NioServerSocketChannelTest.java

@@ -16,7 +16,6 @@
 package io.netty.channel.socket.nio;
 
 import io.netty.channel.Channel;
-import io.netty.channel.ChannelFuture;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
 import org.junit.Assert;