Vxider opened a new issue #3242: 
com.twitter.heron.streamlet.impl.sources.ComplexSource cannot be cast to 
org.apache.heron.api.spout.ISpout
URL: https://github.com/apache/incubator-heron/issues/3242
 
 
   I have encountered an exception when using implementing 'custom source' 
followed by "SimplePulsarSourceTopology" in example. Here is the exception log:
   
   ```
   java.lang.ClassCastException: 
com.twitter.heron.streamlet.impl.sources.ComplexSource cannot be cast to 
org.apache.heron.api.spout.ISpout
           at 
org.apache.heron.instance.spout.SpoutInstance.<init>(SpoutInstance.java:121)
           at 
org.apache.heron.instance.Slave.handleNewAssignment(Slave.java:154)
           at 
org.apache.heron.instance.Slave.handleNewPhysicalPlan(Slave.java:364)
           at org.apache.heron.instance.Slave.access$300(Slave.java:55)
           at org.apache.heron.instance.Slave$1.run(Slave.java:124)
           at 
org.apache.heron.common.basics.WakeableLooper.executeTasksOnWakeup(WakeableLooper.java:191)
           at 
org.apache.heron.common.basics.WakeableLooper.runOnce(WakeableLooper.java:110)
           at 
org.apache.heron.common.basics.WakeableLooper.loop(WakeableLooper.java:100)
           at org.apache.heron.instance.Slave.run(Slave.java:186)
           at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
           at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
           at java.lang.Thread.run(Thread.java:745)
   ```
   
   Is this error caused by the difference between the Heron 
application(org.apache.xxx) and the maven API(com.twitter.xxx) package name?

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