Weird flowBuilderServices exception

[antonylees]

Hi all

I've upgraded recently to webflow 2 and I'm getting a weird exception when spring tries to create the flowBuilderServices bean. This happens even if I don't specify one and allow spring to create the default one

The exception is

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowRegistry': Cannot resolve reference to bean 'org.springframework.webflow.engine.builder.support.FlowBuilderServices#0' while setting bean property 'flowBuilderServices'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.webflow.engine.builder.support.FlowBuilderServices#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Method must not be null
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:275)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:104)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1245)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:269)
	... 42 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.webflow.engine.builder.support.FlowBuilderServices#0': Initialization of bean failed; nested exception is java.lang.IllegalArgumentException: Method must not be null
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:269)
	... 55 more
Caused by: java.lang.IllegalArgumentException: Method must not be null
	at org.springframework.util.Assert.notNull(Assert.java:112)
	at org.springframework.core.BridgeMethodResolver.findBridgedMethod(BridgeMethodResolver.java:63)
	at org.springframework.beans.GenericTypeAwarePropertyDescriptor.<init>(GenericTypeAwarePropertyDescriptor.java:59)
	at org.springframework.beans.CachedIntrospectionResults.<init>(CachedIntrospectionResults.java:250)
	at org.springframework.beans.CachedIntrospectionResults.forClass(CachedIntrospectionResults.java:144)
	at org.springframework.beans.BeanWrapperImpl.getCachedIntrospectionResults(BeanWrapperImpl.java:252)
	at org.springframework.beans.BeanWrapperImpl.getPropertyDescriptorInternal(BeanWrapperImpl.java:282)
	at org.springframework.beans.BeanWrapperImpl.isWritableProperty(BeanWrapperImpl.java:333)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1247)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
	... 64 more

And my applicationContext looks like

    <flow:flow-executor id="flowExecutor" flow-registry="flowRegistry">
        <flow:flow-execution-attributes>
            <flow:always-redirect-on-pause value="false"/>
        </flow:flow-execution-attributes>
    </flow:flow-executor>
    
    <!-- Creates the registry of flow definitions for this application -->
	<flow:flow-registry id="flowRegistry">
	    <flow:flow-location path="/WEB-INF/flows/rating-flow.xml" />
	</flow:flow-registry>

Anyone any ideas?

[theseion]

This might sound silly but: are you sure that you upgraded all components? Since spring checks a spring-native method and throws an exception I'd say the error might be some kind of compatibility issue.

theseion

[antonylees]

you never know I guess! I'll check!

[antonylees]

Looks like it was a maven issue not refreshing the spring-core version
Thanks for making me look in the right place!

[theseion]

my pleasure