title: Why I am getting java.lang.AbstractMethodError errors?
body: <p>What are the possible causes for ABstractMethodError?</p>
  
  <p>Exception in thread "pool-1-thread-1" java.lang.AbstractMethodError: </p>
  
  <pre><code>org.apache.thrift.ProcessFunction.isOneway()Z
      at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:51)
      at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
      at com.gemfire.gemstone.thrift.hbase.ThreadPoolServer$ClientConnnection.run(Unknown Source)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:662)
  </code></pre>