I got Exception: Could not resolve class

[Chen Liang]

Thanks for sharing Oystein. The problem is that ClassHierarchyResolver.of(Collection, Map) takes the immediate values in the argument and ignores subsequent updates, which is how most ClassFile APIs work, unfortunately. (The same thing happens if you try to do so for AnnotationValue.OfArray or RuntimeVisibleAnnotationsAttribute)

I recommend you return a ClassHierarchyResolver implementation of your own, that returns the real-time results from your ClassHierarchy static fields.

Regards, Chen
________________________________
From: classfile-api-dev <classfile-api-dev-retn at openjdk.org> on behalf of Øystein Myhre Andersen <o.myhre at gmail.com>
Sent: Friday, October 18, 2024 3:02 AM
To: Chen Liang <liangchenblue at gmail.com>
Cc: classfile-api-dev <classfile-api-dev at openjdk.org>
Subject: Re: I got Exception: Could not resolve class

Here is the link:
https://github.com/portablesimula/SimulaCompiler2/blob/main/Simula/src/simula/compiler/utilities/ClassHierarchy.java

I use:
openjdk version "24-ea" 2025-03-18
OpenJDK Runtime Environment (build 24-ea+16-1800)
OpenJDK 64-Bit Server VM (build 24-ea+16-1800, mixed mode, sharing)

- Øystein

On Fri, Oct 18, 2024 at 9:51 AM Chen Liang <liangchenblue at gmail.com<mailto:liangchenblue at gmail.com>> wrote:
Hi Øystein, can you share a link to your ClassHierarchy code? ClassFile API has a layer of caching for the ClassHierarchyResolver it uses, which can lead to it not updating to the latest information in your ClassHierarchy.

Chen

On Fri, Oct 18, 2024 at 2:40 AM Øystein Myhre Andersen <o.myhre at gmail.com<mailto:o.myhre at gmail.com>> wrote:

Below is a snippet of my code:


public byte[] buildClassFile() {

ClassDesc CD_ThisClass = currentClassDesc();

ClassDesc CD_SuperClass = superClassDesc();

ClassHierarchy.addClassToSuperClass(CD_ThisClass, CD_SuperClass);

try {

byte[] bytes = ClassFile.of(ClassFile.ClassHierarchyResolverOption.of(ClassHierarchy.getResolver())).build(CD_ThisClass,


...

return(bytes);

} catch(Throwable e) {

ClassHierarchyResolver resolver = ClassHierarchy.getResolver();

ClassDesc desc = ClassDesc.of("simulaFEC.CLASS_CHECKER1_semchecker1_exp");

System.out.println("classInfo("+desc+") = " + resolver.getClassInfo(desc));


e.printStackTrace();

return null;

}

}

When I run this code I get:


classInfo(ClassDesc[CLASS_CHECKER1_semchecker1_exp]) = ClassHierarchyInfoImpl[superClass=ClassDesc[RTS_CLASS], isInterface=false]

java.lang.IllegalArgumentException: Could not resolve class CLASS_CHECKER1_semchecker1_exp

at java.base/jdk.internal.classfile.impl.ClassHierarchyImpl.resolve(ClassHierarchyImpl.java:76)

at java.base/jdk.internal.classfile.impl.ClassHierarchyImpl.isInterface(ClassHierarchyImpl.java:86)

at java.base/jdk.internal.classfile.impl.StackMapGenerator$Type.mergeReferenceFrom(StackMapGenerator.java:1334)

.....

I use my own 'resolver' which answers that 'CLASS_CHECKER1_semchecker1_exp' is a subclass of 'RTS_CLASS'.

I don't understand this.


- Øystein Myhre Andersen
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