Steven Walters created GROOVY-7549:
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Summary: java.lang.IllegalAccessError occurs when attempting to
run code built with CompileStatic
Key: GROOVY-7549
URL: https://issues.apache.org/jira/browse/GROOVY-7549
Project: Groovy
Issue Type: Bug
Affects Versions: 2.4.4
Reporter: Steven Walters
Priority: Minor
Given a small code setup such as the following, where there exists a
# A publicly declared interface
# A package private implementation of the interface
# A static factory class that returns an instance of the implementation *as the
implementation class*
{code:title=packa.TheInterface.groovy|borderStyle=solid}
package packa
public interface TheInterface {
public void doStuff()
}
{code}
{code:title=packb.TheImplementation.groovy|borderStyle=solid}
package packb
import packa.TheInterface
@groovy.transform.CompileStatic
@groovy.transform.PackageScope
class TheImplementation implements TheInterface {
public void doStuff() {
System.out.println("Do some stuff")
}
}
{code}
{code:title=packb.TheFactory.groovy|borderStyle=solid}
package packb
public class TheFactory {
static TheImplementation getAnInstance() {
return new TheImplementation()
}
}
{code}
With CompileStatic, calling the factory method successfully works, but calling
any method on the returned object fails with {{java.lang.IllegalAccessError}}.
When CompileStatic is removed, the code runs without issue.
Such as the following.
{code:title=packa.TheMain.groovy|borderStyle=solid}
package packa
import packb.TheFactory
@groovy.transform.CompileStatic
public class TheMain {
public static void main(String[] args) {
TheInterface if1 = TheFactory.anInstance
/* the following only fails when CompileStatic is enabled with the
following error:
* Exception in thread "main" java.lang.IllegalAccessError: tried to
access class packb.TheImplementation from class packa.TheMain */
if1.doStuff()
}
}
{code}
There seem to be some interesting factors here, as changing the {{TheFactory}}
to return {{TheInterface}} instead of {{TheImplemenation}} also seems to
resolve the issue.
However, changing the return of the {{TheFactory}} is not desirable, as in the
actual production the above sample was formulated from, there are other classes
in the {{packb}} package that utilize {{TheFactory}} and should not require
class casts from {{TheInterface}} to {{TheImplementation}}
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