[FLINK-11767] [tests] Introduce new TypeSerializerUpgradeTestBase

flink-core/src/test/java/org/apache/flink/api/common/typeutils/ThreadContextClassLoader.java

@@ -0,0 +1,40 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.api.common.typeutils;
+
+import java.io.Closeable;
+import java.io.IOException;
+
+/**
+ * Utility class to temporarily use a different classloader as the thread context classloader.
+ */
+public class ThreadContextClassLoader implements Closeable {
+
+	private final ClassLoader originalThreadContextClassLoader;
+
+	public ThreadContextClassLoader(ClassLoader newThreadContextClassLoader) {
+		this.originalThreadContextClassLoader = Thread.currentThread().getContextClassLoader();
+		Thread.currentThread().setContextClassLoader(newThreadContextClassLoader);
+	}
+
+	@Override
+	public void close() throws IOException {
+		Thread.currentThread().setContextClassLoader(originalThreadContextClassLoader);
+	}
+}