Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1818#discussion_r56803053
--- Diff: flink-core/src/main/java/org/apache/flink/util/UserCodeValue.java
---
@@ -0,0 +1,98 @@
+/*
+ * 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.util;
+
+
+import java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.Arrays;
+
+/**
+ * Value wrapper which automatically transfers the data as a serialized
byte array. Upon reception
+ * the serialized byte array has to be explicitly deserialized providing a
class loader with the
+ * correct classes.
+ *
+ * This is useful if the object would get deserialized by the system class
loader which does not
+ * have access to the user code classes.
+ * @param <T>
+ */
+public class UserCodeValue<T extends Serializable> implements Serializable
{
+ private static final long serialVersionUID = 6903400536729445732L;
+
+ private transient T value;
+
+ private byte[] serializedValue;
+
+ public UserCodeValue(T value) {
+ this.value = value;
+ }
+
+ public T getValue() {
+ if (value == null && serializedValue != null) {
+ throw new NullPointerException("The user code value has
not been serialied. Call " +
--- End diff --
good catch. Thanks :-)
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