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From: Kevan Miller <kevan.miller@gmail.com>
Subject: AbstractConverter.setValue()
Date: Fri, 31 Aug 2007 01:01:21 -0400

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I ran into the following error on G 2.0.1 with Spring versions  
2.0.5-2.0.7-SNAPSHOT. PropertyEditor.setValue() is being called with  
an object whose type does not match the defined type.

15:54:12,596 ERROR [ContextLoader] Context initialization failed
org.springframework.beans.factory.access.BootstrapException: Unable  
to initialize group definition. Group resource name  
[classpath*:beanRefContext.xml], factory key [ear.context]; nested  
exception is org.springframework.beans.factory.BeanCreationException:  
Error creating bean with name 'ear.context' defined in URL [jar:file:/ 
Users/kevan/Desktop/geronimo-tomcat6-jee5-2.0.1/repository/org/spring/ 
example/MultipleContexts/1.0/MultipleContexts-1.0.ear/lib/ 
SampleJava.jar!/beanRefContext.xml]: Instantiation of bean failed;  
nested exception is  
org.apache.xbean.propertyeditor.PropertyEditorException: Value is not  
an instance of String
Caused by:
org.springframework.beans.factory.BeanCreationException: Error  
creating bean with name 'ear.context' defined in URL [jar:file:/Users/ 
kevan/Desktop/geronimo-tomcat6-jee5-2.0.1/repository/org/spring/ 
example/MultipleContexts/1.0/MultipleContexts-1.0.ear/lib/ 
SampleJava.jar!/beanRefContext.xml]: Instantiation of bean failed;  
nested exception is  
org.apache.xbean.propertyeditor.PropertyEditorException: Value is not  
an instance of String
Caused by:
org.apache.xbean.propertyeditor.PropertyEditorException: Value is not  
an instance of String
at org.apache.xbean.propertyeditor.AbstractConverter.setValue 
(AbstractConverter.java:67)
at org.springframework.beans.TypeConverterDelegate.doConvertValue 
(TypeConverterDelegate.java:276)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary 
(TypeConverterDelegate.java:192)
<snip>

Spring has been updated in latest builds to ignore this problem (see  
http://opensource.atlassian.com/projects/spring/browse/SPR-3799).  
There's some question about what the proper behavior is in this  
case... I didn't find any spec-level guidance... http:// 
weblogs.java.net/blog/ljnelson/archive/2007/08/objects_and_str.html  
(search for 'dilemma') recommends logging the condition and ignoring  
the type mismatch.

This pretty much exhausts my knowledge of the subject. Any thoughts  
on being a little less dogmatic and ignoring the type mismatch?

--kevan
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