Agent opens access to java.base to unnamed module #1328
Description
We're migrating to JDK 17 and found that we were unable to run tests with JaCoCo to verify code was not accessing encapsulated Java internals in the java.base package.
Steps to reproduce
- JaCoCo version: 0.8.8
- Operating system: macOS 10.4
- Tool integration: Command-line Agent
Given class IllegalAccess.java and JDK 17:
import java.lang.Throwable;
public class IllegalAccess {
public static void main(String[] args) throws Exception {
Throwable.class.getDeclaredMethod("setCause", Throwable.class).setAccessible(true);
}
}
Run without Jacoco and note the exception:
$ java IllegalAccess
Exception in thread "main" java.lang.reflect.InaccessibleObjectException: Unable to make final void java.lang.Throwable.setCause(java.lang.Throwable) accessible: module java.base does not "opens java.lang" to unnamed module @a803f94
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:199)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:193)
at IllegalAccess.main(IllegalAccess.java:5)
Run with Jacoco and no exception is thrown:
$ java -javaagent:/Users/dannyt/Downloads/jacoco-0.8.8/lib/jacocoagent.jar IllegalAccess
Expected behaviour
The agent should not cause runtime side effects to code under test. This in particular makes it impossible to verify production code doesn't perform illegal accesses at test time causing this code to fail when deployed.
Actual behaviour
The agent adds java.base to the exported modules for the unnamed module causing the entire classpath to be granted access.
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