I use Cloud Datastore API to check for Kinds in the Datastore, then use Dataflow -- now upgrading to Beam -- to copy one Datastore to another..
After adding beam-sdks-java-io-google-cloud-platform to my pom, I start getting this when initializing the Cloud Datastore API Exception in thread "main" java.lang.NoClassDefFoundError: com/google/api/gax/retrying/ResultRetryAlgorithm at com.google.cloud.datastore.DatastoreOptions$DefaultDatastoreFactory. create(DatastoreOptions.java:51) at com.google.cloud.datastore.DatastoreOptions$DefaultDatastoreFactory. create(DatastoreOptions.java:45) at com.google.cloud.ServiceOptions.getService(ServiceOptions.java:426) It is caused by gax dependencies. Specifically, before I add beam-sdks-java-io-google-cloud-platform there is this gax dependency +- com.google.cloud:google-cloud-datastore:jar:1.12.0:compile | +- com.google.cloud:google-cloud-core:jar:1.12.0:compile | | +- com.google.api:gax:jar:1.15.0:compile and after I add it there is this +- org.apache.beam:beam-sdks-java-io-google-cloud-platform:jar:2.2.0:compile | +- com.google.api:gax-grpc:jar:0.20.0:compile | | +- com.google.api:gax:jar:1.3.1:compile If I add gax 1.15.0 to my pom explicitly, I get Exception in thread "main" java.lang.NoClassDefFoundError: com/google/api/gax/retrying/ExceptionRetryAlgorithm at java.lang.ClassLoader.defineClass1(Native Method) .. at com.google.cloud.BaseService.<clinit>(BaseService.java:48) at com.google.cloud.datastore.DatastoreOptions$DefaultDatastoreFactory.create(DatastoreOptions.java:51) at com.google.cloud.datastore.DatastoreOptions$DefaultDatastoreFactory.create(DatastoreOptions.java:45) at com.google.cloud.ServiceOptions.getService(ServiceOptions.java:426) Clearly Datastore and Beam should work together. Yet there have been dependency problems between the two for a while. See this discussion <https://stackoverflow.com/questions/40830727/> from 1 year ago. How can I resolve this?
