Bean introspection fails for annotation-valued properties
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Key: BEEHIVE-149
URL: http://nagoya.apache.org/jira/browse/BEEHIVE-149
Project: Beehive
Type: Bug
Components: Controls
Versions: V1Alpha
Reporter: Kyle Marvin
Assigned to: 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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