premain: CGLIB error during the training run with Petclinic

[Alan Bateman]

On 11/09/2024 11:50, Sebastien Deleuze wrote:
> :
>
> Request processing failed: java.lang.RuntimeException: 
> java.lang.IllegalStateException: 
> org.springframework.cglib.core.ReflectUtils$2: No compatible 
> defineClass mechanism detected: JVM should be started with 
> --add-opens=java.base/java.lang=ALL-UNNAMED for 
> ClassLoader.defineClass to be accessible. On the module path, you may 
> not be able to define this CGLIB-generated class at all.] with root cause
> java.lang.reflect.InaccessibleObjectException: Unable to make 
> protected final java.lang.Class 
> java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) 
> throws java.lang.ClassFormatError accessible: module java.base does 
> not "opens java.lang" to unnamed module @d5c1bc
> at 
> java.base/java.lang.reflect.AccessibleObject.throwInaccessibleObjectException(AccessibleObject.java:388) 
> ~[na:na]
> at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:364) 
> ~[na:na]
> at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:312) 
> ~[na:na]
> at 
> java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:190) 
> ~[na:na]
> at java.base/java.lang.reflect.Method.setAccessible(Method.java:184) 
> ~[na:na]
> at 
> org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:505) 
> ~[spring-core-6.2.0-M7.jar:6.2.0-M7]

Are you saying that it "works" without --add-opens (and without 
-XX:CacheDataStore)?

I wonder if this library that has more than one way to inject classes, 
something fails, and it falls back to trying setAccessible as it worked 
in older JDK releases?

In any case, it is surprising to see this in 2024. Lookup.defineClass, 
and later Lookup.defineHiddenClass, are there for the frameworks to 
inject a proxy/other classes into same runtime package as a class that 
the framework is given access to.

I can't tell if this is related to the VerifyError.

-Alan