Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4455
There's a compilation failure in flink-tests:
```
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile
(default-testCompile) on project flink-tests_2.11: Compilation failure:
Compilation failure:
[ERROR]
/home/travis/build/apache/flink/flink-tests/src/test/java/org/apache/flink/test/streaming/runtime/StateBackendITCase.java:[67]
[ERROR] .map(new RichMapFunction<Tuple2<String, Integer>, String>() {
[ERROR] ^^^
[ERROR] The method map(MapFunction<Tuple2<String,Object>,R>) in the type
DataStream<Tuple2<String,Object>> is not applicable for the arguments (new
RichMapFunction<Tuple2<String,Integer>,String>(){})
[ERROR]
/home/travis/build/apache/flink/flink-tests/src/test/java/org/apache/flink/test/example/client/JobRetrievalITCase.java:[99]
[ERROR] final ActorSystem actorSystem = actorSystemSeq.last();
[ERROR] ^^^^
[ERROR] The method last() is ambiguous for the type Seq<ActorSystem>
```
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