Since the impact of this bug can be big, and the fix is simple and low risk
(just avoids doing optimizations), I'd like to put this into JDK 19 before RDP2
(Jul 21).
CDS cannot handle Lambda proxy classes that are generated in the
useImplMethodHandle mode. This could happen with classfiles generated by JDK 8
or JDK 11 that access protected methods in a base class from a different
package. E.g.,
class pkg1.Base {
protected void doit(String s) {
System.out.println(s);
}
}
class pkg2.Child extends pkg1.Base {
void test() {
Optional<String> opt = Optional.of("foo");
opt.ifPresent(this::doit);
}
}
More details of useImplMethodHandle can be found here:
https://github.com/openjdk/jdk/blob/522b65743ca10fcba0a27d25b8fa11319999e228/src/java.base/share/classes/java/lang/invoke/InnerClassLambdaMetafactory.java#L183-L191
More details about the condition that triggers the error can be found in the
test file Child.jcod.
-------------
Commit messages:
- 8290417: CDS cannot archive lamda proxy with useImplMethodHandle
Changes: https://git.openjdk.org/jdk19/pull/146/files
Webrev: https://webrevs.openjdk.org/?repo=jdk19&pr=146&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8290417
Stats: 436 lines in 6 files changed: 434 ins; 0 del; 2 mod
Patch: https://git.openjdk.org/jdk19/pull/146.diff
Fetch: git fetch https://git.openjdk.org/jdk19 pull/146/head:pull/146
PR: https://git.openjdk.org/jdk19/pull/146
