Paul King created GROOVY-11916:
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Summary: Star imports should not resolve package-private types
Key: GROOVY-11916
URL: https://issues.apache.org/jira/browse/GROOVY-11916
Project: Groovy
Issue Type: Bug
Reporter: Paul King
Groovy's star import resolution (e.g., import java.util.*) currently includes
package-private classes in name resolution. On modern JDKs (9+) with the module
system, these classes cannot actually be used — attempts result in
IllegalAccessError at runtime. This leads to confusing errors and inconsistency
with Java's behaviour where star imports only resolve public types.
For example, import java.util.* allows def cls = TimSort to compile (resolving
the package-private java.util.TimSort), but any actual usage (instanceof,
construction, method calls) fails at runtime with IllegalAccessError.
The fix should filter non-public classes during star import resolution in
ResolveVisitor, producing a clean compile-time error instead of a runtime
error. This is technically a breaking change but only affects code that was
already failing at runtime on modular JDKs.
This also benefits the import module feature (GROOVY-11896), which expands to
star imports — filtering at the resolution level means module imports correctly
include only public types, matching Java's import module semantics.
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