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. 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