I got Exception: Could not resolve class

[Øystein Myhre Andersen]

But, it wasn't that simple !

On Sat, Oct 19, 2024 at 8:04 AM Øystein Myhre Andersen <o.myhre at gmail.com>
wrote:

> I think I can solve the problem with a 're-try loop'.
> Something like this:
>
> boolean done = false;
>
> while(! done) {
>
> try {
>
> byte[] bytes =
> ClassFile.of(ClassFile.ClassHierarchyResolverOption.of(ClassHierarchy.getResolver())).build(CD_ThisClass,
>
>
> ...
>
> done = true;
>
> return(bytes);
>
> } catch(Throwable e) {}
>
> }
>
> On Sat, Oct 19, 2024 at 7:44 AM Øystein Myhre Andersen <o.myhre at gmail.com>
> wrote:
>
>> I tried to implement 'ClassHierarchyInfo' but I got "Sealed type
>> ClassHierarchyInfo cannot be super type
>> of MyClassHierarchyInfo as it is from a different package or split
>> package or module"
>>
>>
>> I misses a method to instantiate 'ClassHierarchyInfo' to deliver the
>> result from 'getClassInfo'
>>
>>
>> May be you should add a method like:
>>
>>
>> 'static ClassHierarchyInfo of(ClassDesc subClass, ClassDesc superClass,
>> boolean isInterface)'
>>
>>
>> to the 'ClassHierarchyInfo'
>>
>>
>> - Øystein
>>
>> On Fri, Oct 18, 2024 at 3:46 PM Chen Liang <chen.l.liang at oracle.com>
>> wrote:
>>
>>> 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>
>>> 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> 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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