cassandra java driver annotation processing

I'm not familiar with SBT, but from what I can find online it doesn't have native support for Java annotation processors. You'll need to write a custom task to invoke javac with the processor options; this StackOverflow question looks like a good starting point.

Thanks Olivier, that got me going. Essentially, in the javac options I am using -processorPath and specifying the full path to my processor jar:

/Users/samarjit.uppal/.ivy2/cache/com.datastax.oss/java-driver-mapper-processor/jars/java-driver-mapper-processor-4.1.0.jar

The javac command is essentially the following; am only doing the annotation processing (no compiling):

javac -classpath ... -proc:only -processorpath /Users/samarjit.uppal/.ivy2/cache/com.datastax.oss/java-driver-mapper-processor/jars/java-driver-mapper-processor-4.1.0.jar  -XprintRounds -s /Users/samarjit.uppal/projects/paymentinterfaceservice/target/generated_sources repository.impl.IPaymentMapper repository.impl.IPaymentRequestDao

I can also see that my classpath has the mapper-runtime jar:

/Users/samarjit.uppal/.ivy2/cache/com.datastax.oss/java-driver-mapper-runtime/bundles/java-driver-mapper-runtime-4.1.0.jar

However, when the processor begins to do its work, it cant seem to find the defined annotations in the runtime jar.

Here is the exception:

An annotation processor threw an uncaught exception.
Consult the following stack trace for details.
java.lang.NoClassDefFoundError: com/datastax/oss/driver/api/mapper/annotations/Entity
    at com.datastax.oss.driver.internal.mapper.processor.MapperProcessor.getSupportedAnnotationTypes(MapperProcessor.java:133)

Why is the mapper unable to locate the annotation package when its in the classpath?