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Home/ Questions/Q 8129019
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Editorial Team
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Editorial Team
Asked: June 6, 20262026-06-06T08:07:51+00:00 2026-06-06T08:07:51+00:00

I am using SpringSource Tool Suite 2.9.2 and Grails 2.0.3. I am trying to

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I am using SpringSource Tool Suite 2.9.2 and Grails 2.0.3. I am trying to use the Expressions and Display windows, but both are giving me errors.

The Expression Window says:

org.eclipse.debug.core.DebugException:
com.sun.jdi.ObjectCollectedException occurred retrieving type

This message is different sometimes and says it could not get the right types as if I didn’t include packages.

The Display Window says:

“Evaluation failed. Reason(s): An exception occurred durring
evaluation.”

Anyone have any idea what is going on?

EDIT:
Andrew, all of those items in the Preferences were checked with the exception of “Enable extra Groovy debug support on all projects (not just Groovy projects).” which I checked.

I still get the error, and for some reason nothing is showing up in the log, but the Expressions opens a sub window that says:

See error log: startup failed:
__Eval.groovy: 7: unable to resolve class mydomain.User @ line 7, column 23. import mydomain.User;
^

1 error

Something that is probably relevant: This import is the 3rd domain import on the page. The other two that look like they are working are in the “domain” folder in my “grails-app” folder, but the one that is not working is in “src/groovy” as the project is using Hibernate.xml files. I would expect the Expressions to work for either, but maybe this is the problem?

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  1. Editorial Team
    Editorial Team
    2026-06-06T08:07:53+00:00Added an answer on June 6, 2026 at 8:07 am

    There are several things that you need to do before debug evaluations can work in Groovy. Most of the time, these things are configured automatically, but sometimes you need to do one or two things manually.

    1. Go to Preferences -> JDT Weaving, make sure it is enabled
    2. Go to Preferences -> Groovy -> Debugger -> Extended debugging. Make sure that all check boxes are selected.

    If you are still getting this exception, then this may be a bug. Please update your question with the full stack trace from the error log (Window -> Show view -> Other -> Error log). Also, include the code snippet that you are evaluating.

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