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http://issues.apache.org/jira/browse/BEEHIVE-149?page=comments#action_57237 ]
Kyle Marvin commented on BEEHIVE-149:
-------------------------------------
Actually, the 4th line in the example should be:
bean.setGender(genderMap.getPropertySet(Gender.class));
You have to specify the PropertySet you'd like to extract from the map...but
this also avoids the cast on the return type.
> Bean introspection fails for annotation-valued properties
> ---------------------------------------------------------
>
> Key: BEEHIVE-149
> URL: http://issues.apache.org/jira/browse/BEEHIVE-149
> Project: Beehive
> Type: Bug
> Components: Controls
> Versions: V1Alpha
> Reporter: Kyle Marvin
> Assignee: Kyle Marvin
> Priority: Minor
> Fix For: V1Beta
>
> BeanInfo introspection of a Control type that has a property that is based
> upon a JSR-175 annotation type will fail w/ an Introspection exception. The
> following is a sample exception, based upon the
> org.apache.beehive.controls.test.controls.basic.Hello test control included
> in the checkin tests:
> Caused by: java.beans.IntrospectionException: Method not found: setGender
> at java.beans.PropertyDescriptor.<init>(PropertyDescriptor.java:93)
> at java.beans.PropertyDescriptor.<init>(PropertyDescriptor.java:53)
> at
> org.apache.beehive.controls.test.controls.basic.HelloBeanBeanInfo.initPropertyDescriptors(HelloBeanBeanInfo.java:137)
> at
> org.apache.beehive.controls.test.controls.basic.HelloBeanBeanInfo.getPropertyDescriptors(HelloBeanBeanInfo.java:149)
> at
> java.beans.Introspector.getTargetPropertyInfo(Introspector.java:475)
> at java.beans.Introspector.getBeanInfo(Introspector.java:385)
> at java.beans.Introspector.getBeanInfo(Introspector.java:155)
> The rub is that the java.beans.PropertyDescriptor class expects to find a
> method with the following signature:
> public void setGender(Gender gender);
> while bean exposes the following instead:
> public void setGender(PropertyMap genderMap);
> This is because it is impossible to 'new' a JSR-175 annotation type and
> initialize its values, so the PropertyMap interface (and the corresponsing
> concrete impl, BeanPropertyMap) exists to abstract a collection of annotation
> type property values. You can create a BeanPropertyMap, push values into it,
> and then use it to set the (annotation-typed) property.
> The fix is to modify the BeanInfo codegen to use the
> java.beans.PropertyDescriptor constructor that takes actual
> java.lang.reflect.Methods as arguments, to explicitly specify the specific
> setter method on the bean class instead of allowing PropertyDescriptor to use
> the default algorithm.
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