Spring MVC "No converter found capable of converting from type java.lang.String to type org.springframework.core.io.Resource"

Question

We have a number of custom "org.springframework.core.convert.converter.Converter" converters that help us automatically map URL params in rest requests to our domain objects.

Today we have these converters registered by defining a conversion service:

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <!-- List of custom converter beans here -->
        </set>
    </property>
</bean>

and then registering it using:

<mvc:annotation-driven conversion-service="conversionService" />

However we get the following exception on startup for each of our definitions:

org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.util.ArrayList<?> to type java.util.List<org.springframework.core.io.Resource> for value '[/WEB-INF/images/]'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.lang.String to type org.springframework.core.io.Resource

Has anyone encountered / resolved this before?

We are using spring 3.2.9.

have you got an ill-formed mvc:resources tag floating around somewhere? A look at the rest of your dispatcherservlet xml context would be a big help to anyone trying to help you here... — dectarin
– dectarin, Commented Jul 28, 2014 at 10:38
See the answer i posted below dectarin, my bad ;( however, see sample project if you want to see the exception yourself and the setup required to create it — Jamie Cramb
– Jamie Cramb, Commented Jul 28, 2014 at 11:46

dectarin · Accepted Answer · 2014-07-28 12:41:33Z

4

Im glad you got it sorted anyway. I pulled the project and ran it myself anyway just to take a look and your explanation is correct. You could add this to your log4j.xml if you wanted to get rid of that message from polluting your logs in the future :-)

<logger name="org.springframework.beans.TypeConverterDelegate">
    <level value="error" />
</logger>

answered Jul 28, 2014 at 12:41

dectarin

1,0166 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jamie Cramb · Accepted Answer · 2014-07-28 11:45:22Z

Turns out this was just me not reading the line above the stack trace properly... missed the fact that the line above the stack was "DEBUG".

In short, the conversion service is unable to convert from a String to a Resource; however, spring falls back on it's PropertyEditor-based conversion which succeeds (I believe this is how String-Resource conversions are done normally).

I created a sample project that will re-create this debug exception: https://github.com/jamiecramb/pastebin/tree/master/conversion-test.

Example of the full stack was as follows:

DEBUG: org.springframework.beans.TypeConverterDelegate - Original ConversionService attempt failed - ignored since PropertyEditor based conversion eventually succeeded
org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.util.ArrayList<?> to type java.util.List<org.springframework.core.io.Resource> for value '[/WEB-INF/css/]'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.lang.String to type org.springframework.core.io.Resource
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:168)
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:161)
    at org.springframework.beans.BeanWrapperImpl.convertIfNecessary(BeanWrapperImpl.java:448)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:494)
    at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:488)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1463)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1422)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1158)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:602)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:521)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:462)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:160)
    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1280)
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1193)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5198)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5481)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:634)
    at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:671)
    at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1840)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.lang.String to type org.springframework.core.io.Resource
    at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:276)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:171)
    at org.springframework.core.convert.support.CollectionToCollectionConverter.convert(CollectionToCollectionConverter.java:83)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:35)
    ... 40 more

I had the same stack trace but it only occur when I define ConversionService bean.

Ludovic Guillaume · Accepted Answer · 2014-10-23 18:38:43Z

1

I just had the error with Spring 4.1.1 and the same definition of FormattingConversionServiceFactoryBean.

Hiding logs won't resolve the issue... and in my opinion, it's not a viable solution, especially for production.

I fixed it by changing <set></set> to <list></list>.

answered Oct 23, 2014 at 18:38

Ludovic Guillaume

3,2872 gold badges26 silver badges43 bronze badges

Comments

NoSui · Accepted Answer · 2018-11-01 09:20:27Z

I also met this question recently.

My Spring version is 4.1.x.In the beginning，I only use the FormattingConversionServiceFactoryBean to config my customed converter like this：

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
    <property name="registerDefaultFormatters" value="false" />
    <property name="converters">
        <set>
            <bean class="com.example.controller.converter.CustomerStringToDateConverter"/>
        </set>
    </property>
</bean>

<mvc:annotation-driven conversion-service="conversionService"/>

It works well.

But when I use the "Serving of Resources",it throws exception

<mvc:resources mapping="/js/**" location="/js/" cache-period="31556926"/>

DEBUG [RMI TCP Connection(3)-127.0.0.1] - Original ConversionService attempt failed - ignored since PropertyEditor based conversion eventually succeeded
org.springframework.core.convert.ConversionFailedException: Failed to convert from type java.util.ArrayList<?> to type java.util.List<org.springframework.core.io.Resource> for value '[/js/]'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type java.util.ArrayList<?> to type org.springframework.core.io.Resource

The way to solve this question is change the id name of the "FormattingConversionServiceFactoryBean" ,for example "conversionService2".

<mvc:annotation-driven conversion-service="conversionService"/>

and change this refer at the same time

Collectives™ on Stack Overflow

Spring MVC "No converter found capable of converting from type java.lang.String to type org.springframework.core.io.Resource"

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

Comments

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related