Ambiguous mapping found. Cannot map 'xxxController' bean method

错误信息如下：

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'declareMattersController' bean method 
public java.lang.String com.jeeplus.modules.declare.web.DeclareMattersController.form2(com.jeeplus.modules.declare.entity.DeclareMatters,org.springframework.ui.Model)
to {[/a/declare/declareMatters/form2],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'declareMattersController' bean method
public java.lang.String com.jeeplus.modules.declare.web.DeclareMattersController.form2(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,org.springframework.ui.Model,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) throws java.io.IOException,freemarker.template.TemplateException,java.lang.IllegalArgumentException,java.lang.IllegalAccessException mapped.
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1554)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:706)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
	at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403)
	at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)
	at com.jeeplus.modules.sys.listener.WebContextListener.initWebApplicationContext(WebContextListener.java:16)
	at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1247)
	at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1898)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

 遇到错误不要慌，耐心查看报错信息。解决问题一般分三个步骤：

1、确定大概方向(一般的错误提示重点会在上面，所以从上往下开始查看。)

发现重点“Ambiguous mapping found. Cannot map 'declareMattersController' bean method ”，大致意思是“模糊映射发现。不能映射'declareMattersController' bean方法”   。映射：只能是一对一映射或多对一映射。此处的关键提示是“映射模糊”，那必定是映射关系不正确，确定大概方向。

2、根据关联信息，发现问题根本

再往下看看还有没有与此关联的错误信息，发现重点“public java.lang.String com.jeeplus.modules.declare.web.DeclareMattersController.form2(com.jeeplus.modules.declare.entity.DeclareMatters,org.springframework.ui.Model)
to {[/a/declare/declareMatters/form2],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'declareMattersController' bean method”，由此可知“form2”方法在“declareMattersController”中已经存在，结合刚刚的方向得知，一个“declareMattersController”中出现了2个“form2”方法，是一对多的关系，这在映射中是不合法的，故出现“映射模糊”的错误。通过分析错误信息得出，出现问题的原因是方法名字重复，这就是问题的根本。

3、解决错误

解决办法：对重复的方法进行重命名，改变其中任一方法名即可。

PS：重点，可以理解为你能看懂或者熟悉的代码。