diff --git a/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackHuffmanDecoder.java b/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackHuffmanDecoder.java
index fb786de27a..dea44c291c 100644
--- a/codec-http2/src/main/java/io/netty/handler/codec/http2/HpackHuffmanDecoder.java
+++ b/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 {
 
diff --git a/codec-http2/src/test/java/io/netty/handler/codec/http2/Http2MultiplexHandlerTest.java b/codec-http2/src/test/java/io/netty/handler/codec/http2/Http2MultiplexHandlerTest.java
index f99aac0df7..882d935f11 100644
--- a/codec-http2/src/test/java/io/netty/handler/codec/http2/Http2MultiplexHandlerTest.java
+++ b/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}.
diff --git a/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java b/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java
index db36d5b332..98ec6605dd 100644
--- a/common/src/main/java/io/netty/util/concurrent/DefaultPromise.java
+++ b/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;
 
diff --git a/common/src/test/java/io/netty/util/concurrent/PromiseCombinerTest.java b/common/src/test/java/io/netty/util/concurrent/PromiseCombinerTest.java
index a8d5b04922..4d49b6d79e 100644
--- a/common/src/test/java/io/netty/util/concurrent/PromiseCombinerTest.java
+++ b/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;
diff --git a/handler/src/test/java/io/netty/handler/ssl/ConscryptOpenSslEngineInteropTest.java b/handler/src/test/java/io/netty/handler/ssl/ConscryptOpenSslEngineInteropTest.java
index 1fb0d91511..cb55f8fa06 100644
--- a/handler/src/test/java/io/netty/handler/ssl/ConscryptOpenSslEngineInteropTest.java
+++ b/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;
diff --git a/handler/src/test/java/io/netty/handler/ssl/OpenSslJdkSslEngineInteroptTest.java b/handler/src/test/java/io/netty/handler/ssl/OpenSslJdkSslEngineInteroptTest.java
index 4cd4306349..b74e1c551f 100644
--- a/handler/src/test/java/io/netty/handler/ssl/OpenSslJdkSslEngineInteroptTest.java
+++ b/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;
 
diff --git a/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServer.java b/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServer.java
index 033d80939f..3676cd0510 100644
--- a/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServer.java
+++ b/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
diff --git a/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServerInitializer.java b/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServerInitializer.java
index c326c6a7ad..80a53a0b8f 100644
--- a/testsuite-native-image/src/main/java/io/netty/testsuite/svm/HttpNativeServerInitializer.java
+++ b/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> {
 
diff --git a/transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollChannel.java b/transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollChannel.java
index b3224de4b7..10e10ef580 100644
--- a/transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollChannel.java
+++ b/transport-native-epoll/src/main/java/io/netty/channel/epoll/AbstractEpollChannel.java
@@ -37,7 +37,6 @@ 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;
diff --git a/transport-native-epoll/src/main/java/io/netty/channel/epoll/LinuxSocket.java b/transport-native-epoll/src/main/java/io/netty/channel/epoll/LinuxSocket.java
index 34648ac5d2..99cc6fe6b8 100644
--- a/transport-native-epoll/src/main/java/io/netty/channel/epoll/LinuxSocket.java
+++ b/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;
diff --git a/transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDomainSocketChannelConfig.java b/transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDomainSocketChannelConfig.java
index b092f184a8..50a7d7b324 100644
--- a/transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDomainSocketChannelConfig.java
+++ b/transport-native-kqueue/src/main/java/io/netty/channel/kqueue/KQueueDomainSocketChannelConfig.java
@@ -28,8 +28,8 @@ import io.netty.util.internal.UnstableApi;
 import java.util.Map;
 
 import static io.netty.channel.unix.UnixChannelOption.DOMAIN_SOCKET_READ_MODE;
-import static java.util.Objects.requireNonNull;
 import static io.netty.channel.ChannelOption.ALLOW_HALF_CLOSURE;
+import static java.util.Objects.requireNonNull;
 
 @UnstableApi
 public final class KQueueDomainSocketChannelConfig extends KQueueChannelConfig implements DomainSocketChannelConfig {