[jboss-jira] [JBoss JIRA] Commented: (JASSIST-82) FieldAccess.getField() throws RuntimeException: javassist.bytecode.ClassInfo cannot be cast to javassist.bytecode.FieldrefInfo

[Shigeru Chiba (JIRA)]

    [ https://jira.jboss.org/jira/browse/JASSIST-82?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12465921#action_12465921 ] 

Shigeru Chiba commented on JASSIST-82:
--------------------------------------

I guess you called getFiled() after calling replace() on the same FieldAccess object.  Since replace() modifies the bytecode, getField() does not work any more.  This is a specification for performance.

> FieldAccess.getField() throws RuntimeException: javassist.bytecode.ClassInfo cannot be cast to javassist.bytecode.FieldrefInfo
> ------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JASSIST-82
>                 URL: https://jira.jboss.org/jira/browse/JASSIST-82
>             Project: Javassist
>          Issue Type: Bug
>    Affects Versions: 3.10.0.GA
>            Reporter: Martin Burger
>            Assignee: Shigeru Chiba
>
> My code calls javassist.expr.FieldAccess.getField() on an instrumented class. This method call fails with a RuntimeException: javassist.bytecode.ClassInfo cannot be cast to javassist.bytecode.FieldrefInfo:
> java.lang.ClassCastException: javassist.bytecode.ClassInfo cannot be cast to javassist.bytecode.FieldrefInfo
>         at javassist.bytecode.ConstPool.getFieldrefClassName(ConstPool.java:258)
>         at javassist.expr.FieldAccess.getClassName(FieldAccess.java:97)
>         at javassist.expr.FieldAccess.getCtClass(FieldAccess.java:89)
>         at javassist.expr.FieldAccess.getField(FieldAccess.java:112)

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