spring配置c3p0为什么抛出异常ContextLoaderListener ConflictingBeanDefinitionException?

严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener

org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'c3P0PooledDataSourceMBean' for bean class [com.mchange.v2.c3p0.mbean.C3P0PooledDataSourceMBean] conflicts with existing, non-compatible bean definition of same name and class [com.mchange.v2.c3p0.jboss.C3P0PooledDataSourceMBean]

    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:312)

    at org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.checkCandidate(MapperScannerConfigurer.java:450)

    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:253)

    at org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.doScan(MapperScannerConfigurer.java:394)

    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.scan(ClassPathBeanDefinitionScanner.java:220)

    at org.mybatis.spring.mapper.MapperScannerConfigurer.postProcessBeanDefinitionRegistry(MapperScannerConfigurer.java:283)

    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:630)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)

    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)

    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)

    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)

    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4994)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5492)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1575)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1565)

    at java.util.concurrent.FutureTask.run(FutureTask.java:266)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

    at java.lang.Thread.run(Thread.java:745)