Explicitly pass host in SocketAppenderReconnectTest

Author: vy

log4j-core-test/src/test/java/org/apache/logging/log4j/core/appender/SocketAppenderReconnectTest.java

@@ -75,10 +75,11 @@ void repeating_reconnect_failures_should_be_propagated() throws Exception {
 
             // Start the server.
             server.start("Main", EPHEMERAL_PORT);
-            final int port = server.getServerSocket().getLocalPort();
+            final String serverHost = server.getServerSocket().getInetAddress().getHostAddress();
+            final int serverPort = server.getServerSocket().getLocalPort();
 
             // Initialize the logger context
-            final Configuration config = createConfiguration(port, null);
+            final Configuration config = createConfiguration(serverHost, serverPort, null);
             try (final LoggerContext loggerContext = createStartedLoggerContext(config)) {
 
                 // Configure the error handler
@@ -93,7 +94,7 @@ void repeating_reconnect_failures_should_be_propagated() throws Exception {
                 verifyLoggingFailure(loggerContext, errorHandler);
 
                 // Start the server again, and verify the logging success.
-                server.start("Main", port);
+                server.start("Main", serverPort);
                 verifyLoggingSuccess(loggerContext, server, errorHandler);
             }
         }
@@ -119,9 +120,9 @@ void reconnect_should_fallback_when_there_are_multiple_resolved_hosts() throws E
 
                 // Initialize the logger context
                 final Configuration config = createConfiguration(
-                        // Passing an invalid port, since the resolution is supposed to be performed by the mocked host
-                        // resolver anyway.
-                        0, null);
+                        // Passing dummy host & port, since the resolution is supposed to be performed by the mocked
+                        // host resolver anyway.
+                        "localhost", 0, null);
                 try (final LoggerContext loggerContext = createStartedLoggerContext(config)) {
 
                     // Configure the error handler
@@ -213,7 +214,9 @@ void key_store_changes_should_be_detected_at_reconfigure(
 
             // Start the 1st server
             server1.start("1st", EPHEMERAL_PORT);
-            final int port = server1.getServerSocket().getLocalPort();
+            final String server1Host =
+                    server1.getServerSocket().getInetAddress().getHostAddress();
+            final int server1Port = server1.getServerSocket().getLocalPort();
 
             // Create the configuration transformer to add the `<Ssl>`, `<KeyStore>`, and `<TrustStore>` elements
             final BiFunction<
@@ -239,7 +242,8 @@ void key_store_changes_should_be_detected_at_reconfigure(
                     };
 
             // Initialize the logger context
-            final Configuration config1 = createConfiguration(port, appenderComponentBuilderTransformer);
+            final Configuration config1 =
+                    createConfiguration(server1Host, server1Port, appenderComponentBuilderTransformer);
             try (final LoggerContext loggerContext = createStartedLoggerContext(config1)) {
 
                 // Configure the error handler
@@ -251,7 +255,7 @@ void key_store_changes_should_be_detected_at_reconfigure(
 
                 // Stop the 1st server and start the 2nd one (using different SSL configuration!) on the same port
                 server1.close();
-                server2.start("2nd", port);
+                server2.start("2nd", server1Port);
 
                 // Stage the key store files using the 2nd `SSLContext`
                 Files.write(keyStoreFilePath, Files.readAllBytes(Paths.get(keyStore2Location)));
@@ -283,7 +287,8 @@ void key_store_changes_should_be_detected_at_reconfigure(
                 //
                 // Hence, the only way is to programmatically build the very same configuration, twice, and use the 1st
                 // one for initialization, and the 2nd one for reconfiguration.
-                final Configuration config2 = createConfiguration(port, appenderComponentBuilderTransformer);
+                final Configuration config2 =
+                        createConfiguration(server1Host, server1Port, appenderComponentBuilderTransformer);
                 loggerContext.reconfigure(config2);
 
                 // Verify the working state on the 2nd server
@@ -293,6 +298,7 @@ void key_store_changes_should_be_detected_at_reconfigure(
     }
 
     private static Configuration createConfiguration(
+            final String host,
             final int port,
             @Nullable
                     final BiFunction<
@@ -310,7 +316,7 @@ private static Configuration createConfiguration(
         // Create the appender configuration
         final AppenderComponentBuilder appenderComponentBuilder = configBuilder
                 .newAppender(APPENDER_NAME, "Socket")
-                .addAttribute("host", "localhost")
+                .addAttribute("host", host)
                 .addAttribute("port", port)
                 .addAttribute("ignoreExceptions", false)
                 .addAttribute("reconnectionDelayMillis", 10)