[hotfix] Fix the access modifiers in TaskManagerRunner

flink-runtime/src/main/java/org/apache/flink/runtime/taskexecutor/TaskManagerRunner.java

@@ -18,6 +18,7 @@
 
 package org.apache.flink.runtime.taskexecutor;
 
+import org.apache.flink.annotation.VisibleForTesting;
 import org.apache.flink.api.common.time.Time;
 import org.apache.flink.api.java.tuple.Tuple2;
 import org.apache.flink.configuration.Configuration;
@@ -92,7 +93,8 @@ public class TaskManagerRunner implements FatalErrorHandler, AutoCloseableAsync
 
  private static final int STARTUP_FAILURE_RETURN_CODE = 1;
 
- public static final int RUNTIME_FAILURE_RETURN_CODE = 2;
+ @VisibleForTesting
+ static final int RUNTIME_FAILURE_RETURN_CODE = 2;
 
  private final Object lock = new Object();
 
@@ -414,9 +416,10 @@ static BackPressureSampleService createBackPressureSampleService(
  * @param configuration The configuration for the TaskManager.
  * @param haServices to use for the task manager hostname retrieval
  */
- public static RpcService createRpcService(
- final Configuration configuration,
- final HighAvailabilityServices haServices) throws Exception {
+ @VisibleForTesting
+ static RpcService createRpcService(
+ final Configuration configuration,
+ final HighAvailabilityServices haServices) throws Exception {
 
  checkNotNull(configuration);
  checkNotNull(haServices);