spring3的一个报错，原因是maven依赖包冲突，有重复的依赖。

报错如下：

严重: Context initialization failed
org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.context.support.XmlWebApplicationContext]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.core.convert.converter.ConverterRegistry.addConverter(Ljava/lang/Class;Ljava/lang/Class;Lorg/springframework/core/convert/converter/Converter;)V
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:104)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:339)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:281)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NoSuchMethodError: org.springframework.core.convert.converter.ConverterRegistry.addConverter(Ljava/lang/Class;Ljava/lang/Class;Lorg/springframework/core/convert/converter/Converter;)V
at org.springframework.core.convert.support.DefaultConversionService.addScalarConverters(DefaultConversionService.java:62)
at org.springframework.core.convert.support.DefaultConversionService.addDefaultConverters(DefaultConversionService.java:53)
at org.springframework.core.convert.support.DefaultConversionService.<init>(DefaultConversionService.java:42)
at org.springframework.core.env.AbstractPropertyResolver.<init>(AbstractPropertyResolver.java:44)
at org.springframework.core.env.PropertySourcesPropertyResolver.<init>(PropertySourcesPropertyResolver.java:42)
at org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:101)
at org.springframework.core.env.StandardEnvironment.<init>(StandardEnvironment.java:54)
at org.springframework.web.context.support.StandardServletEnvironment.<init>(StandardServletEnvironment.java:43)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.createEnvironment(AbstractRefreshableWebApplicationContext.java:139)
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:227)
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:217)
at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:82)
at org.springframework.context.support.AbstractRefreshableConfigApplicationContext.<init>(AbstractRefreshableConfigApplicationContext.java:51)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.<init>(AbstractRefreshableWebApplicationContext.java:94)
at org.springframework.web.context.support.XmlWebApplicationContext.<init>(XmlWebApplicationContext.java:62)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
... 19 more
2012-2-22 10:55:32 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.web.context.support.XmlWebApplicationContext]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.core.convert.converter.ConverterRegistry.addConverter(Ljava/lang/Class;Ljava/lang/Class;Lorg/springframework/core/convert/converter/Converter;)V
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:162)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:104)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:339)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:281)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NoSuchMethodError: org.springframework.core.convert.converter.ConverterRegistry.addConverter(Ljava/lang/Class;Ljava/lang/Class;Lorg/springframework/core/convert/converter/Converter;)V
at org.springframework.core.convert.support.DefaultConversionService.addScalarConverters(DefaultConversionService.java:62)
at org.springframework.core.convert.support.DefaultConversionService.addDefaultConverters(DefaultConversionService.java:53)
at org.springframework.core.convert.support.DefaultConversionService.<init>(DefaultConversionService.java:42)
at org.springframework.core.env.AbstractPropertyResolver.<init>(AbstractPropertyResolver.java:44)
at org.springframework.core.env.PropertySourcesPropertyResolver.<init>(PropertySourcesPropertyResolver.java:42)
at org.springframework.core.env.AbstractEnvironment.<init>(AbstractEnvironment.java:101)
at org.springframework.core.env.StandardEnvironment.<init>(StandardEnvironment.java:54)
at org.springframework.web.context.support.StandardServletEnvironment.<init>(StandardServletEnvironment.java:43)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.createEnvironment(AbstractRefreshableWebApplicationContext.java:139)
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:227)
at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:217)
at org.springframework.context.support.AbstractRefreshableApplicationContext.<init>(AbstractRefreshableApplicationContext.java:82)
at org.springframework.context.support.AbstractRefreshableConfigApplicationContext.<init>(AbstractRefreshableConfigApplicationContext.java:51)
at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.<init>(AbstractRefreshableWebApplicationContext.java:94)
at org.springframework.web.context.support.XmlWebApplicationContext.<init>(XmlWebApplicationContext.java:62)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
... 19 more
2012-2-22 10:55:32 org.apache.catalina.core.StandardContext start

################################################################################################################

我的pom.xml如下：

<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>org.springframework.core</artifactId>
<version>3.0.6.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>3.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.0.6</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>jdbc.mysql</groupId>
<artifactId>mysql-connector</artifactId>
<version>5.1.5</version>
</dependency>
</dependencies>

################################################################################################################

我把

<dependency>
<groupId>org.springframework</groupId>
<artifactId>org.springframework.core</artifactId>
<version>3.0.6.RELEASE</version>
</dependency>

删掉后，就不报错了。可能原因是，spirng-web已经依赖了org.springframework.core，这样就重复依赖了。可问题是，徐晓斌的《maven实战》5.7节说，maven会自己调解依赖的啊？不解，求解释。

参考了：http://forum.springsource.org/showthread.php?113485-java-lang-NoSuchMethodError-org-springframework-core-convert-converter-Convert-erRegi