Cannot create GenericMachine using builder() for anything but Object without compiler warnings/errors - Githubissues

aws / event-ruler

Event Ruler is a Java library that allows matching many thousands of Events per second to any number of expressive and sophisticated rules.

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Cannot create GenericMachine using builder() for anything but Object without compiler warnings/errors #174

Closed youngm closed 3 months ago

youngm commented 3 months ago

I'd like to create a GenericMachine for Integer and I cannot do it without unsafe casts and compiler warnings.

To Reproduce

Try these various ways to create a GenericMachine without a warning or error. They all fail.

GenericMachine<Integer> try1Deprecated = new GenericMachine<Integer>();
GenericMachine<Integer> try1Raw = GenericMachine.builder().build();
GenericMachine<Integer> try2Raw =
    GenericMachine.builder().<GenericMachine<Integer>>build();
GenericMachine<Integer> try3NotVisible =
    new GenericMachine.Builder<GenericMachine<Integer>>().build();

Expected behavior

Should be able to create a GenericMachine for a given type without a compiler warning.

Perhaps the build() method could accept a generic parameter?

Environment:

Java 17

Additional context

Sure, GenericMachine