Fix Jetty ConnectionLimit configuration

See gh-39052

Author: okohub

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/jetty/JettyServletWebServerFactory.java

@@ -116,6 +116,7 @@
  * @author Venil Noronha
  * @author Henri Kerola
  * @author Moritz Halbritter
+ * @author Onur Kagan Ozcan
  * @since 2.0.0
  * @see #setPort(int)
  * @see #setConfigurations(Collection)
@@ -183,7 +184,7 @@ public WebServer getWebServer(ServletContextInitializer... initializers) {
 		server.setHandler(addHandlerWrappers(context));
 		this.logger.info("Server initialized with port: " + port);
 		if (this.maxConnections > -1) {
-			server.addBean(new ConnectionLimit(this.maxConnections, server));
+			server.addBean(new ConnectionLimit(this.maxConnections, server.getConnectors()));
 		}
 		if (Ssl.isEnabled(getSsl())) {
 			customizeSsl(server, address);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/jetty/JettyServletWebServerFactoryTests.java

@@ -72,6 +72,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.InstanceOfAssertFactories.LIST;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.BDDMockito.given;
 import static org.mockito.Mockito.inOrder;
@@ -85,6 +86,7 @@
  * @author Andy Wilkinson
  * @author Henri Kerola
  * @author Moritz Halbritter
+ * @author Onur Kagan Ozcan
  */
 class JettyServletWebServerFactoryTests extends AbstractServletWebServerFactoryTests {
 
@@ -541,6 +543,17 @@ void shouldApplyMaxConnections() {
 		assertThat(connectionLimit.getMaxConnections()).isOne();
 	}
 
+	@Test
+	void shouldApplyingMaxConnectionUseConnector() throws Exception {
+		JettyServletWebServerFactory factory = getFactory();
+		factory.setMaxConnections(1);
+		this.webServer = factory.getWebServer();
+		Server server = ((JettyWebServer) this.webServer).getServer();
+		assertThat(server.getConnectors()).isEmpty();
+		ConnectionLimit connectionLimit = server.getBean(ConnectionLimit.class);
+		assertThat(connectionLimit).extracting("_connectors", LIST).hasSize(1);
+	}
+
 	@Override
 	protected String startedLogMessage() {
 		return ((JettyWebServer) this.webServer).getStartedLogMessage();