fix: don't apply Bean factories for proto enums

[simonresch]

The following fuzz test signature would fail during printing of the constructed mutator

 @FuzzTest
 public static void complexProtoFuzzTest(
      @NotNull TestProtobuf proto, @NotNull DescriptorProtos.DescriptorProto descriptor) {}

...
INFO: Loaded 6 hooks from com.code_intelligence.jazzer.sanitizers.XPathInjection
INFO: Instrumented com.example.MutatorComplexProtoFuzzer (took 34 ms, size +8%)
Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.code_intelligence.jazzer.driver.Driver.start(Driver.java:181)
	at com.code_intelligence.jazzer.Jazzer.start(Jazzer.java:118)
	at com.code_intelligence.jazzer.Jazzer.main(Jazzer.java:71)
Caused by: java.lang.NullPointerException: Cannot invoke "com.code_intelligence.jazzer.mutation.api.SerializingMutator.toDebugString(java.util.function.Predicate)" because "productMutator" is null
	at com.code_intelligence.jazzer.mutation.mutator.aggregate.AggregatesHelper.lambda$createMutator$5(AggregatesHelper.java:138)
	at com.code_intelligence.jazzer.mutation.combinator.MutatorCombinators$7.toDebugString(MutatorCombinators.java:263)
	at com.code_intelligence.jazzer.mutation.combinator.MutatorCombinators$14.toDebugString(MutatorCombinators.java:585)
	at com.code_intelligence.jazzer.mutation.mutator.lang.NullableMutatorFactory$NullableMutator.toDebugString(NullableMutatorFactory.java:130)
	at com.code_intelligence.jazzer.mutation.combinator.MutatorCombinators$1.toDebugString(MutatorCombinators.java:102)
...

Using the full original factory to construct a mutator for protobuf enum types would trigger a deeply nested mutator construction attempt on the EnumValueDescriptor class using e.g. the CachedConstructorMutatorFactory. While this still ended up at the dedicated enum mutator for most cases, for complex protobuf parameters it could lead to the construction of invalid mutators.

At the point where an enum type is reached we now use a simplified factory instead that only deals with repeated or nullable enums.

[Copilot]

Pull Request Overview

This PR fixes a bug where using full bean factories for protobuf enum types could trigger deeply nested mutator construction attempts, leading to invalid mutators for complex protobuf parameters. The fix replaces the full original factory with a simplified factory that only handles repeated or nullable enums when processing enum types.

• Simplified enum mutator factory construction to prevent invalid mutator creation
• Updated Bazel visibility rules to allow proper package dependencies
• Added regression test for complex protobuf parameter scenarios

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main/java/com/code_intelligence/jazzer/mutation/mutator/proto/BuilderMutatorFactory.java	Core fix replacing full factory with simplified enum-specific factory
src/test/java/com/code_intelligence/jazzer/mutation/ArgumentsMutatorTest.java	Regression test for protobuf enum handling with complex parameters
src/main/java/com/code_intelligence/jazzer/mutation/mutator/proto/BUILD.bazel	Added dependencies for collection and lang mutators
src/main/java/com/code_intelligence/jazzer/mutation/mutator/lang/BUILD.bazel	Updated visibility to allow subpackage access
src/main/java/com/code_intelligence/jazzer/mutation/mutator/collection/BUILD.bazel	Updated visibility to allow subpackage access
src/test/java/com/code_intelligence/jazzer/mutation/mutator/proto/BUILD.bazel	Expanded visibility for test proto dependencies
src/test/java/com/code_intelligence/jazzer/mutation/BUILD.bazel	Added proto dependencies for test compilation

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[oetr]

LGTM!