Regression after jpackage+1-49 update
David Holmes
david.holmes at oracle.com
Mon Oct 7 03:35:47 UTC 2019
Hi,
On 7/10/2019 1:21 am, Tornai András wrote:
> Hello,
>
>
> After I updated my project from jpackage+1-35 to the latest jpackage+1-49 I
> noticed that Java now throws NoClassDefFoundError while this was not the
> case before.
Nothing to do with jpackage but a fix to Class.forName to ensure classes
are linked as per the specification of forName. You can temporarily
workaround with -XX:+ClassForNameDeferLinking, but your code needs to be
updated to deal with LinkageErrors from Class.forName.
Cheers,
David
-----
>
> Repro case:
>
> import java.lang.reflect.Field;
> import java.util.Optional;
>
> public class Main {
>
> private Optional<Service> service;
>
> public static void main(String[] args) throws Exception {
> System.out.println(Runtime.version());
> Class<?> class0 = Main.class.getClassLoader().loadClass("Main");
> Field field0 = class0.getDeclaredField("service");
> field0.getGenericType();
> }
> }
>
> public class Service {
>
> public Service(OptionalService optionalService) {
> }
>
> public Service() {
> this(new OptionalService() {
> });
> }
> }
>
> public class OptionalService {
> }
>
>
>
> *With 14-jpackage+1-35*
> c:\Private\jdk14-jpackage-1-35-vs-49>javac Main.java
> c:\Private\jdk14-jpackage-1-35-vs-49>del OptionalService.class
> c:\Private\jdk14-jpackage-1-35-vs-49>java Main
> 14-jpackage+1-35
>
>
>
> *With 14-jpackage+1-49*
> c:\Private\jdk14-jpackage-1-35-vs-49>javac Main.java
> c:\Private\jdk14-jpackage-1-35-vs-49>del OptionalService.class
> c:\Private\jdk14-jpackage-1-35-vs-49>java Main
> 14-jpackage+1-49
> Exception in thread "main" java.lang.NoClassDefFoundError: OptionalService
> at java.base/java.lang.Class.forName0(Native Method)
> at java.base/java.lang.Class.forName(Class.java:420)
> at
> java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
> at
> java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
> at
> java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
> at
> java.base/sun.reflect.generics.visitor.Reifier.reifyTypeArguments(Reifier.java:68)
> at
> java.base/sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:138)
> at
> java.base/sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
> at
> java.base/sun.reflect.generics.repository.FieldRepository.computeGenericType(FieldRepository.java:90)
> at
> java.base/sun.reflect.generics.repository.FieldRepository.getGenericType(FieldRepository.java:82)
> at java.base/java.lang.reflect.Field.getGenericType(Field.java:266)
> at Main.main(Main.java:12)
> Caused by: java.lang.ClassNotFoundException: OptionalService
> at
> java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602)
> at
> java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
> ... 12 more
>
>
> Regards,
> András
>
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