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https://issues.apache.org/jira/browse/JOHNZON-347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17563235#comment-17563235
 ] 

Andreas Wiesinger commented on JOHNZON-347:
-------------------------------------------

Yes, our Johnzon Mapper is set to 1.2.18.
However, the error message is slightly different as in this ticket:

{code:java}
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field 
private byte[] javax.smartcardio.CommandAPDU.apdu accessible: module 
java.smartcardio does not "opens javax.smartcardio" to unnamed module @...
        at 
java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
 ~[?:?]
        at 
java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
 ~[?:?]
        at java.lang.reflect.Field.checkCanSetAccessible(Field.java:178) ~[?:?]
        at java.lang.reflect.Field.setAccessible(Field.java:172) ~[?:?]
        at 
org.apache.johnzon.mapper.access.FieldAccessMode$FieldDecoratedType.<init>(FieldAccessMode.java:110)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.FieldAccessMode$FieldReader.<init>(FieldAccessMode.java:174)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.FieldAccessMode.doFindReaders(FieldAccessMode.java:50)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.BaseAccessMode.findReaders(BaseAccessMode.java:82)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.FieldAndMethodAccessMode.doFindReaders(FieldAndMethodAccessMode.java:78)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.BaseAccessMode.findReaders(BaseAccessMode.java:82)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.jsonb.JsonbAccessMode.findReaders(JsonbAccessMode.java:501) 
~[johnzon-jsonb-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.access.KnownNotOpenedJavaTypesAccessMode.findReaders(KnownNotOpenedJavaTypesAccessMode.java:182)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.Mappings.createClassMapping(Mappings.java:478) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.Mappings.doFindOrCreateClassMapping(Mappings.java:439)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.Mappings.findOrCreateClassMapping(Mappings.java:413) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteObjectBody(MappingGeneratorImpl.java:351)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.MappingGeneratorImpl.writeValue(MappingGeneratorImpl.java:515)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteObjectBody(MappingGeneratorImpl.java:407)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.MappingGeneratorImpl.doWriteObject(MappingGeneratorImpl.java:197)
 ~[johnzon-mapper-1.2.18.jar:1.2.18]
        at org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:207) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.mapper.Mapper.writeObjectWithGenerator(Mapper.java:192) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:186) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:201) 
~[johnzon-mapper-1.2.18.jar:1.2.18]
        at org.apache.johnzon.jsonb.JohnzonJsonb.toJson(JohnzonJsonb.java:396) 
~[johnzon-jsonb-1.2.18.jar:1.2.18]
        at 
org.apache.johnzon.jaxrs.jsonb.jaxrs.JsonbJaxrsProvider.writeTo(JsonbJaxrsProvider.java:277)
 ~[johnzon-jsonb-1.2.18.jar:1.2.18]
{code}

We use {{javax.smartcardio.CommandAPDU}} from the OpenJDK 18.
There we simply call a {{return new CommandAPDU(rawApdu);} inside a getter 
method.
This leads to the error above.
Tried to add {{--add-opens  java.base/java.lang=ALL-UNNAMED}} to the 
corresponding {{pom.xml}} with no luck.
Tried to add {{@JohnzonIgnore}} to this method with no luck.



> Mapper.write(Array|Object)() fails on JDK 17
> --------------------------------------------
>
>                 Key: JOHNZON-347
>                 URL: https://issues.apache.org/jira/browse/JOHNZON-347
>             Project: Johnzon
>          Issue Type: Bug
>          Components: Mapper
>    Affects Versions: 1.2.13
>            Reporter: Christoph Dreis
>            Priority: Critical
>         Attachments: diff-jsonpointer.git.patch
>
>
> Hi,
> I've noticed that Mapper.writeArray fails on JDK 17 due to 
> [https://openjdk.java.net/jeps/403] strongly encapsulating internals now. To 
> reproduce just run `JohnzonJsonbTest` with JDK 17 (build 25 at least to 
> include JEP 403). You will see stacktraces like the following:
> ```
> java.lang.reflect.InaccessibleObjectException: Unable to make field private 
> final java.lang.Object[] java.util.Arrays$ArrayList.a accessible: module 
> java.base does not "opens java.util" to unnamed module 
> @4361bd48java.lang.reflect.InaccessibleObjectException: Unable to make field 
> private final java.lang.Object[] java.util.Arrays$ArrayList.a accessible: 
> module java.base does not "opens java.util" to unnamed module @4361bd48
>  at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
>  at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
>  at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178) 
> at java.base/java.lang.reflect.Field.setAccessible(Field.java:172) at 
> org.apache.johnzon.mapper.access.FieldAccessMode$FieldDecoratedType.<init>(FieldAccessMode.java:105)
>  at 
> org.apache.johnzon.mapper.access.FieldAccessMode$FieldReader.<init>(FieldAccessMode.java:169)
>  at 
> org.apache.johnzon.mapper.access.FieldAccessMode.doFindReaders(FieldAccessMode.java:49)
>  at 
> org.apache.johnzon.mapper.access.BaseAccessMode.findReaders(BaseAccessMode.java:82)
>  at 
> org.apache.johnzon.mapper.access.FieldAndMethodAccessMode.doFindReaders(FieldAndMethodAccessMode.java:68)
>  at 
> org.apache.johnzon.mapper.access.BaseAccessMode.findReaders(BaseAccessMode.java:82)
>  at 
> org.apache.johnzon.jsonb.JsonbAccessMode.findReaders(JsonbAccessMode.java:468)
>  at 
> org.apache.johnzon.mapper.access.KnownNotOpenedJavaTypesAccessMode.findReaders(KnownNotOpenedJavaTypesAccessMode.java:182)
>  at org.apache.johnzon.mapper.Mappings.createClassMapping(Mappings.java:475) 
> at 
> org.apache.johnzon.mapper.Mappings.doFindOrCreateClassMapping(Mappings.java:437)
>  at 
> org.apache.johnzon.mapper.Mappings.findOrCreateClassMapping(Mappings.java:411)
>  at org.apache.johnzon.mapper.Mapper.isDeduplicateObjects(Mapper.java:202) at 
> org.apache.johnzon.mapper.Mapper.writeObjectWithGenerator(Mapper.java:196) at 
> org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:189) at 
> org.apache.johnzon.mapper.Mapper.writeObject(Mapper.java:217) at 
> org.apache.johnzon.mapper.Mapper.writeArray(Mapper.java:104) at 
> org.apache.johnzon.jsonb.JohnzonJsonb.toJson(JohnzonJsonb.java:390)
> ```
> I didn't find a quick way to fix this, but let me know if I can help.
>  
> Cheers,
> Christoph



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