[jboss-jira] [JBoss JIRA] (JASSIST-263) ClassPool cannot read generated classes

[Shigeru Chiba (JIRA)]

    [ https://issues.jboss.org/browse/JASSIST-263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13291279#comment-13291279 ] 

Shigeru Chiba commented on JASSIST-263:
---------------------------------------

ClassPool needs bytecode since a loaded class does not expose its bytecode although Java 9 seems to include a method to obtain the bytecode.  Here the bytecode means a class file (= generated byte[] array).

> ClassPool cannot read generated classes
> ---------------------------------------
>
>                 Key: JASSIST-263
>                 URL: https://issues.jboss.org/browse/JASSIST-263
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.20.0-GA
>            Reporter: Paul Pogonyshev
>            Assignee: Shigeru Chiba
>         Attachments: JavassistBug.java
>
>
> ClassPool.get() cannot retrieve classes that are in turn generated at runtime. For example, if I try to define at runtime two classes, one of which extends another, the base will not be found, even though it can be retrieved just fine from my class loader. See the attached example.
> As far as I could trace it, the issue comes from ClassPoolTail.find() returning a null URL for the class. This is understandable, since class definition doesn't exist as a file --- it is generated at runtime. However, ClassPool.get() should still succeed for classes that have no URL, yet can be found through its ClassLoader.



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