MethodHandles.lookup().findVirtual() on unexported package does not throw exception

[pdbain-ibm]

For testcase code, see https://github.com/pdbain-ibm/openj9/tree/modularity/test/functional/Java9andUp, org.openj9.test.modularity.tests.MethodVisibilityTests

Test in module org.openj9test.modularity.testerModule tries to perform MethodHandles.lookup().findVirtual() on a class in an unexported package in a read module.

The reference implementation throws java.lang.IllegalAccessException, OpenJ9 throws no error.

[pdbain-ibm]

See #1709 about test development issues.

[pdbain-ibm]

MethodHandles.lookup().findClass() should also throw IllegalAccessException.
MethodType.fromMethodDescriptorString() should throw no exception.

[pdbain-ibm]

From the API spec:

public static MethodHandles.Lookup publicLookup​() Returns a lookup object which is trusted minimally. The lookup has the PUBLIC and UNCONDITIONAL modes. It can only be used to create method handles to public members of public classes in packages that are exported unconditionally. As a matter of pure convention, the lookup class of this lookup object will be Object.

[pdbain-ibm]

Closed by #1801