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From "Marshall Schor (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-5554) Strange exception when trying to get JCas FS class through reflection
Date Sat, 09 Sep 2017 13:16:00 GMT

    [ https://issues.apache.org/jira/browse/UIMA-5554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16159934#comment-16159934
] 

Marshall Schor commented on UIMA-5554:
--------------------------------------

hmmm, threaded jira comments seem to not be working?  anyway, this is a response to https://issues.apache.org/jira/browse/UIMA-5554?focusedCommentId=16159739&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16159739

The English of the message is misleading.  It is easy to misread ""A JCas *class* field "sofa"
is being initialized..." as meaning a JCas *instance* field...   

I'll try and think of a better way to express this.  Maybe "A JCas class static field that
is used to bridge to the UIMA <substitute-the-type name> for the feature "sofa" is being
initialized..."

Basically, the JCas class for this particular UIMA Type has a bunch of "static" fields that
provide a bridge between the Type's features and the JCas class; these data are set up as
static final fields when the class is initialized.

> Strange exception when trying to get JCas FS class through reflection
> ---------------------------------------------------------------------
>
>                 Key: UIMA-5554
>                 URL: https://issues.apache.org/jira/browse/UIMA-5554
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 3.0.0SDK-beta
>            Reporter: Richard Eckart de Castilho
>
> I am trying to get a class object for a JCas FS type using reflection:
> {noformat}
> Class.forName(typeName);
> {noformat}
> However, it produces this strange error.
> {noformat}
> java.lang.ExceptionInInitializerError
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:264)
> ...
> Caused by: org.apache.uima.cas.CASRuntimeException: A JCas class field "sofa" is being
initialized by non-framework (user) code before Type System Commit for a type system with
a corresponding type. Either change the user load code to not do initialize, or to defer it
until after the type system commit.
> 	at org.apache.uima.cas.impl.TypeSystemImpl.getAdjustedFeatureOffset(TypeSystemImpl.java:2575)
> 	at org.apache.uima.jcas.cas.AnnotationBase.<clinit>(AnnotationBase.java:71)
> 	... 27 more
> {noformat}
> Is it considered harmful to try getting a class object for a JCas FS class?



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