Hi,

I want to run the beam examples locally , building from source (for
contributing).
Hence after setting all dependencies (java , etc)
I ran:
 ./gradlew :examples:java execute
-PmainClass=org.apache.beam.examples.WordCount

But I am thrown a build failure:

> Task :examples:java:twitter:execute FAILED
Caching disabled for task ':examples:java:twitter:execute' because:
  Gradle would require more information to cache this task
Task ':examples:java:twitter:execute' is not up-to-date because:
  Task has not declared any outputs despite executing actions.
Starting process 'command
'/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java''.
Working directory:
/Users/vineet/Documents/apache-beam/beam-1/examples/java/twitter Command:
/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java
-Dfile.encoding=UTF-8 -Duser.country=US -Duser.language=en -Duser.variant
org.apache.beam.examples.twitterstreamgenerator.TwitterStream
Successfully started process 'command
'/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home/bin/java''
Error: Could not find or load main class
org.apache.beam.examples.twitterstreamgenerator.TwitterStream

Can anyone help me with this please?
Also, I am a first time contributor in college. So apologies in advance if
I am missing something!

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