Github user revans2 commented on the issue:
https://github.com/apache/storm/pull/1959
OK Now I understand what is happening. I think what we really want is to
mark Func as Serializable. Could you try the following patch instead?
```
diff --git
a/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/Func.java
b/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/Func.java
index a631d9608..041453393 100644
---
a/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/Func.java
+++
b/external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/Func.java
@@ -17,10 +17,12 @@
*/
package org.apache.storm.kafka.spout;
+import java.io.Serializable;
+
/**
* A simple interface to allow compatibility with non java 8
* code bases
*/
-public interface Func<V, R> {
+public interface Func<V, R> extends Serializable {
R apply(V record);
}
```
It should work on both master and 1.x
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