Conversion service is attempting to convert types that should not be converted [SPR-7283]

[spring-projects-issues]

Scott Andrews opened SPR-7283 and commented

There is a regression in the latest snapshots for 3.0.3 from 3.0.2. The conversion service is attempting to convert incompatible types that share a common interface when defining a collection of these types. Each of these types share a common interface, but are not convertible. The content of this array should be respected as is and not converted.

<util:list id="traceResourceFinders">
     <bean id="endPointFinder" class="com.springsource.insight.repo.analysis.EndPointFinder" />
     <bean id="applicationFinder"
          class="com.springsource.insight.repo.analysis.ApplicationFinder" />
     <bean id="applicationInstanceFinder"
          class="com.springsource.insight.repo.analysis.ApplicationInstanceFinder" />
     <bean id="applicationInstanceEndPointFinder"
          class="com.springsource.insight.repo.analysis.ApplicationInstanceEndPointFinder" />
     <bean id="serverFinder" class="com.springsource.insight.repo.analysis.ServerFinder" />
</util:list>

Leads to:

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'traceResourceFinders': Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'sourceList'; nested exception is org.springframework.core.convert.ConversionFailedException: Unable to convert value [com.springsource.insight.repo.analysis.EndPointFinder@586f87, com.springsource.insight.repo.analysis.ApplicationFinder@20b52, com.springsource.insight.repo.analysis.ApplicationInstanceFinder@3540ce, com.springsource.insight.repo.analysis.ApplicationInstanceEndPointFinder@31ac15, com.springsource.insight.repo.analysis.ServerFinder@18ac57] from type 'java.util.ArrayList' to type 'java.util.List'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from [com.springsource.insight.repo.analysis.EndPointFinder] to [com.springsource.insight.repo.analysis.ApplicationFinder]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322)
	... 81 more
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type 'java.util.ArrayList' to required type 'java.util.List' for property 'sourceList'; nested exception is org.springframework.core.convert.ConversionFailedException: Unable to convert value [com.springsource.insight.repo.analysis.EndPointFinder@586f87, com.springsource.insight.repo.analysis.ApplicationFinder@20b52, com.springsource.insight.repo.analysis.ApplicationInstanceFinder@3540ce, com.springsource.insight.repo.analysis.ApplicationInstanceEndPointFinder@31ac15, com.springsource.insight.repo.analysis.ServerFinder@18ac57] from type 'java.util.ArrayList' to type 'java.util.List'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from [com.springsource.insight.repo.analysis.EndPointFinder] to [com.springsource.insight.repo.analysis.ApplicationFinder]
	at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:457)
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:499)
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:493)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1363)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1322)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1076)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
	... 87 more
Caused by: org.springframework.core.convert.ConversionFailedException: Unable to convert value [com.springsource.insight.repo.analysis.EndPointFinder@586f87, com.springsource.insight.repo.analysis.ApplicationFinder@20b52, com.springsource.insight.repo.analysis.ApplicationInstanceFinder@3540ce, com.springsource.insight.repo.analysis.ApplicationInstanceEndPointFinder@31ac15, com.springsource.insight.repo.analysis.ServerFinder@18ac57] from type 'java.util.ArrayList' to type 'java.util.List'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from [com.springsource.insight.repo.analysis.EndPointFinder] to [com.springsource.insight.repo.analysis.ApplicationFinder]
	at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:40)
	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:187)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:141)
	at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:447)
	... 93 more
Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from [com.springsource.insight.repo.analysis.EndPointFinder] to [com.springsource.insight.repo.analysis.ApplicationFinder]
	at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:180)
	at org.springframework.core.convert.support.CollectionToCollectionConverter.convert(CollectionToCollectionConverter.java:63)
	at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:37)
	... 96 more

---

Affects: 3.0.3

Attachments:

• SPR-7283.patch (3.56 kB)

Referenced from: commits 902938e, 0e59fc4

[spring-projects-issues]

Scott Andrews commented

Failing test case

[spring-projects-issues]

Juergen Hoeller commented

This should be fixed in trunk now, through smarter guessing of the common element type.

Juergen