Avoid this escape.

container-messagebus/src/main/java/com/yahoo/messagebus/jdisc/MbusRequest.java

@@ -6,6 +6,7 @@
 import com.yahoo.messagebus.Message;
 
 import java.net.URI;
+import java.util.Objects;
 
 /**
  * @author Simon Thoresen Hult
@@ -18,24 +19,21 @@ public MbusRequest(CurrentContainer current, URI uri, Message msg) {
         this(current, uri, msg, true);
     }
     public MbusRequest(CurrentContainer current, URI uri, Message msg, boolean isServerRequest) {
-        super(current, uri, isServerRequest);
-        this.message = validateMessage(msg);
+        super(current, validateParams(msg, uri), isServerRequest);
+        this.message = msg;
     }
 
     public MbusRequest(Request parent, URI uri, Message msg) {
-        super(parent, uri);
-        this.message = validateMessage(msg);
+        super(parent, validateParams(msg, uri));
+        this.message = msg;
     }
 
     public Message getMessage() {
         return message;
     }
 
-    private Message validateMessage(Message msg) {
-        if (msg != null) {
-            return msg;
-        }
-        release();
-        throw new NullPointerException();
+    private static URI validateParams(Message msg, URI uri) {
+        Objects.requireNonNull(msg, "msg cannot be null");
+        return uri;
     }
 }

container-messagebus/src/main/java/com/yahoo/messagebus/shared/SharedIntermediateSession.java

@@ -21,7 +21,7 @@
 /**
  * @author Simon Thoresen Hult
  */
-public class SharedIntermediateSession extends AbstractResource
+public final class SharedIntermediateSession extends AbstractResource
         implements ClientSession, ServerSession, MessageHandler, ReplyHandler
 {
 

container-messagebus/src/main/java/com/yahoo/messagebus/shared/SharedSourceSession.java

@@ -16,7 +16,7 @@
 /**
  * @author Simon Thoresen Hult
  */
-public class SharedSourceSession extends AbstractResource implements ClientSession, ReplyHandler {
+public final class SharedSourceSession extends AbstractResource implements ClientSession, ReplyHandler {
 
     private static final Logger log = Logger.getLogger(SharedSourceSession.class.getName());
     private final SourceSession session;

metrics-proxy/src/main/java/ai/vespa/metricsproxy/http/application/ApplicationMetricsRetriever.java

@@ -37,7 +37,7 @@
  *
  * @author gjoranv
  */
-public class ApplicationMetricsRetriever extends AbstractComponent implements Runnable {
+public final class ApplicationMetricsRetriever extends AbstractComponent implements Runnable {
 
     private static final Logger log = Logger.getLogger(ApplicationMetricsRetriever.class.getName());
 

metrics-proxy/src/main/java/ai/vespa/metricsproxy/rpc/RpcConnector.java

@@ -20,7 +20,7 @@
  *
  * @author gjoranv
  */
-public class RpcConnector extends AbstractComponent {
+public final class RpcConnector extends AbstractComponent {
     private static final Logger log = Logger.getLogger(RpcConnector.class.getName());
 
     private final Supervisor supervisor;

metrics-proxy/src/main/java/ai/vespa/metricsproxy/rpc/RpcServer.java

@@ -34,7 +34,7 @@
  *
  * @author gjoranv
  */
-public class RpcServer {
+public final class RpcServer {
 
     private static final Logger log = Logger.getLogger(RpcServer.class.getName());
 

metrics-proxy/src/test/java/ai/vespa/metricsproxy/service/MockHttpServer.java

@@ -12,7 +12,7 @@
 /**
  * @author jobergum
  */
-public class MockHttpServer {
+public final class MockHttpServer {
 
     private String response;
     private final HttpServer server;

routing-generator/src/main/java/com/yahoo/vespa/hosted/routing/RoutingGenerator.java

@@ -44,7 +44,7 @@
  * @author oyving
  * @author mpolden
  */
-public class RoutingGenerator extends AbstractComponent {
+public final class RoutingGenerator extends AbstractComponent {
 
     private static final Logger log = Logger.getLogger(RoutingGenerator.class.getName());
     private static final Duration configTimeout = Duration.ofSeconds(10);

routing-generator/src/main/java/com/yahoo/vespa/hosted/routing/nginx/NginxMetricsReporter.java

@@ -40,7 +40,7 @@
  * @author mortent
  * @author mpolden
  */
-public class NginxMetricsReporter extends AbstractComponent implements Runnable {
+public final class NginxMetricsReporter extends AbstractComponent implements Runnable {
 
     private static final Duration interval = Duration.ofSeconds(20);
 

routing-generator/src/test/java/com/yahoo/vespa/hosted/routing/mock/HttpClientMock.java

@@ -60,7 +60,7 @@ private static String requestKey(String method, String url) {
         return method.toUpperCase(Locale.ENGLISH) + " " + url;
     }
 
-    public static class JsonResponse extends BasicHttpResponse implements CloseableHttpResponse {
+    public static final class JsonResponse extends BasicHttpResponse implements CloseableHttpResponse {
 
         public JsonResponse(Path jsonFile, int code) {
             this(Exceptions.uncheck(() -> Files.readString(jsonFile)), code);