Fix checkstyle

core/src/main/java/io/micronaut/core/convert/DefaultArgumentConversionContext.java

@@ -20,7 +20,6 @@
 
 import java.nio.charset.Charset;
 import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Default implementation of the {@link ConversionContext} interface.
@@ -31,6 +30,7 @@
  */
 @Internal
 class DefaultArgumentConversionContext<T> implements ArgumentConversionContext<T> {
+
     private final Argument<T> argument;
     private final Locale finalLocale;
     private final Charset finalCharset;

core/src/main/java/io/micronaut/core/convert/ImmutableArgumentConversionContext.java

@@ -18,8 +18,6 @@
 import io.micronaut.core.type.Argument;
 import io.micronaut.core.util.ArgumentUtils;
 
-import java.util.Map;
-
 /**
  * Immutable variant of {@link io.micronaut.core.convert.ArgumentConversionContext} that can be used as a constant
  * in cases where conversion error handling and rejection is not required.

http-netty/src/main/java/io/micronaut/http/netty/websocket/AbstractNettyWebSocketHandler.java

@@ -182,6 +182,11 @@ protected AbstractNettyWebSocketHandler(
         }
     }
 
+    /**
+     * Calls the open method of the websocket bean.
+     *
+     * @param ctx THe handler context
+     */
     protected void callOpenMethod(ChannelHandlerContext ctx) {
         if (session == null) {
             return;

http-server-netty/src/main/java/io/micronaut/http/server/netty/types/stream/NettyStreamedCustomizableResponseType.java

@@ -18,7 +18,6 @@
 import io.micronaut.core.annotation.Internal;
 import io.micronaut.http.HttpRequest;
 import io.micronaut.http.MutableHttpResponse;
-import io.micronaut.http.netty.AbstractNettyHttpRequest;
 import io.micronaut.http.netty.NettyMutableHttpResponse;
 import io.micronaut.http.server.netty.NettyHttpRequest;
 import io.micronaut.http.server.netty.types.NettyCustomizableResponseType;

http-server/src/main/java/io/micronaut/http/server/RouteExecutor.java

@@ -93,7 +93,7 @@ public final class RouteExecutor {
 
     private static final Logger LOG = LoggerFactory.getLogger(RouteExecutor.class);
     /**
-     * Also present in netty RoutingInBoundHandler
+     * Also present in netty RoutingInBoundHandler.
      */
     private static final Pattern IGNORABLE_ERROR_MESSAGE = Pattern.compile(
             "^.*(?:connection.*(?:reset|closed|abort|broken)|broken.*pipe).*$", Pattern.CASE_INSENSITIVE);

inject/src/main/java/io/micronaut/inject/annotation/AbstractAnnotationMetadataBuilder.java

@@ -32,7 +32,6 @@
 import java.lang.annotation.Annotation;
 import java.lang.annotation.RetentionPolicy;
 import java.util.*;
-import java.util.concurrent.ConcurrentHashMap;
 import java.util.function.BiConsumer;
 import java.util.function.Predicate;
 import java.util.function.Supplier;