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Posted to dev@beehive.apache.org by "James Song (JIRA)" <be...@incubator.apache.org> on 2005/02/01 01:10:17 UTC
[jira] Created: (BEEHIVE-218) Java generics on controls:needs a programmatic instantiation model
Java generics on controls:needs a programmatic instantiation model
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Key: BEEHIVE-218
URL: http://issues.apache.org/jira/browse/BEEHIVE-218
Project: Beehive
Type: Bug
Components: Controls
Versions: V1Beta
Reporter: James Song
Assigned to: Kyle Marvin
Fix For: V1Beta
A SimpleControl with a type parameter is checked-in by r149232.
It is instantiated declaratively without any problem.
When instantiating this control programmatically, a ClassNotFoundException is thrown. This might be caused by java.beans.Beans.instantiate not supporting instantiating bean class with type parameter.
For instantiating controls with type parameter, some instruction in ControlProgramming.doc might be necessary.
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[jira] Commented: (BEEHIVE-218) Java generics on controls:needs a programmatic instantiation model
Posted by "James Song (JIRA)" <be...@incubator.apache.org>.
[ http://issues.apache.org/jira/browse/BEEHIVE-218?page=comments#action_58344 ]
James Song commented on BEEHIVE-218:
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To repro: ant detailed.tests from controls/test
> Java generics on controls:needs a programmatic instantiation model
> ------------------------------------------------------------------
>
> Key: BEEHIVE-218
> URL: http://issues.apache.org/jira/browse/BEEHIVE-218
> Project: Beehive
> Type: Bug
> Components: Controls
> Versions: V1Beta
> Reporter: James Song
> Assignee: Kyle Marvin
> Fix For: V1Beta
>
> A SimpleControl with a type parameter is checked-in by r149232.
> It is instantiated declaratively without any problem.
> When instantiating this control programmatically, a ClassNotFoundException is thrown. This might be caused by java.beans.Beans.instantiate not supporting instantiating bean class with type parameter.
> For instantiating controls with type parameter, some instruction in ControlProgramming.doc might be necessary.
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[jira] Resolved: (BEEHIVE-218) Java generics on controls:needs a programmatic instantiation model
Posted by "Kyle Marvin (JIRA)" <be...@incubator.apache.org>.
[ http://issues.apache.org/jira/browse/BEEHIVE-218?page=history ]
Kyle Marvin resolved BEEHIVE-218:
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Assign To: James Song (was: Kyle Marvin)
Resolution: Fixed
This was actually an issue in the test itself. You can use Beans.instantiate() or Controls.instantiate() to construct a control with formal type parameters declared as part of its interface. The bound type parameters are not / should not be passed as part of the classname passed to Beans.instantiate... but you can still cast the result back to a bound variable of the appropriate type, and get the expected results/behavior/compile-time type checking. Part of the issue here is that there is no reflective instantation support for generics, because there is really no generic type info at runtime due to its implementation via erasure.
I went ahead and checked in a modified version of the test case that does the right thing (w/ one other minor logic error fix too) as SVN revision 154225, and made both declarative and programmatic generic instantiation tests part of checkin tests as well.
> Java generics on controls:needs a programmatic instantiation model
> ------------------------------------------------------------------
>
> Key: BEEHIVE-218
> URL: http://issues.apache.org/jira/browse/BEEHIVE-218
> Project: Beehive
> Type: Bug
> Components: Controls
> Versions: V1Beta
> Reporter: James Song
> Assignee: James Song
> Fix For: V1Beta
>
> A SimpleControl with a type parameter is checked-in by r149232.
> It is instantiated declaratively without any problem.
> When instantiating this control programmatically, a ClassNotFoundException is thrown. This might be caused by java.beans.Beans.instantiate not supporting instantiating bean class with type parameter.
> For instantiating controls with type parameter, some instruction in ControlProgramming.doc might be necessary.
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[jira] Closed: (BEEHIVE-218) Java generics on controls:needs a programmatic instantiation model
Posted by "James Song (JIRA)" <be...@incubator.apache.org>.
[ http://issues.apache.org/jira/browse/BEEHIVE-218?page=all ]
James Song closed BEEHIVE-218:
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Test had been updated and passing.
> Java generics on controls:needs a programmatic instantiation model
> ------------------------------------------------------------------
>
> Key: BEEHIVE-218
> URL: http://issues.apache.org/jira/browse/BEEHIVE-218
> Project: Beehive
> Type: Bug
> Components: Controls
> Versions: V1Beta
> Reporter: James Song
> Assignee: James Song
> Fix For: V1Beta
>
> A SimpleControl with a type parameter is checked-in by r149232.
> It is instantiated declaratively without any problem.
> When instantiating this control programmatically, a ClassNotFoundException is thrown. This might be caused by java.beans.Beans.instantiate not supporting instantiating bean class with type parameter.
> For instantiating controls with type parameter, some instruction in ControlProgramming.doc might be necessary.
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