Hi!

You are using some outdated dependencies. Now, all Scala-dependent Flink artifacts include the Scala Version Suffix (following common conventions)

Please substitute:
  - flink-streaming-java--> flink-streaming-java_2.10
  - flink-clients --> flink-clients_2.10
  - flink-connector-kafka --> flink-connector-kafka-0.8_2.10

That should do it.

FYI:  You can also try to use the latest release candidate, described here: http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/VOTE-Release-Apache-Flink-1-0-0-RC5-td10628.html

Greetings,
Stephan


On Thu, Mar 3, 2016 at 10:01 PM, Madhire, Naveen <Naveen.Madhire@capitalone.com> wrote:

Hey All,

I am getting the below error while executing a simple Kafka-Flink Application.


java.lang.NoClassDefFoundError: org/apache/flink/api/java/operators/Keys




Below are the maven dependencies which I included in my application. 


<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka_2.9.1</artifactId>
<version>0.8.2.0</version>
</dependency>
<dependency>
<groupId>commons-configuration</groupId>
<artifactId>commons-configuration</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-kafka</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-java</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-clients</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-streaming-java</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>


I checked the Flink source and couldnt find the org.apache.flink.api.java.operators.Keys class.
I found org.apache.flink.api.common.operators.Keys instead. Is there any other Flink dependency which I am missing?


Thanks,
Naveen




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