java程序在运行时卡在log4.j:WARN不动，日志中报错：
2019-06-21 21:02:51,279 [localhost-startStop-1] [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[DEBUG] Eagerly caching bean 'menuMapper' to allow for resolving potential circular references
2019-06-21 21:02:51,279 [localhost-startStop-1] [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[DEBUG] Returning cached instance of singleton bean 'sqlSessionFactory'
2019-06-21 21:02:51,279 [localhost-startStop-1] [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[DEBUG] Autowiring by type from bean name 'menuMapper' via property 'sqlSessionFactory' to bean named 'sqlSessionFactory'
2019-06-21 21:02:51,279 [localhost-startStop-1] [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[DEBUG] Returning eagerly cached instance of singleton bean 'menuMapper' that is not fully initialized yet - a consequence of a circular reference
2019-06-21 21:02:51,279 [localhost-startStop-1] [org.springframework.beans.factory.support.DefaultListableBeanFactory]-[DEBUG] Invoking afterPropertiesSet() on bean with name 'menuMapper'
2019-06-21 21:02:51,285 [localhost-startStop-1] [org.mybatis.spring.mapper.MapperFactoryBean]-[ERROR] Error while adding the mapper 'interface com.guetcloud.mapper.MenuMapper' to configuration.
org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Menu'. Cause: java.lang.ClassNotFoundException: Cannot find class: Menu
Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Menu'. Cause: java.lang.ClassNotFoundException: Cannot find class: Menu
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:103)
at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:66)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)
... 192 more
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Menu'. Cause: java.lang.ClassNotFoundException: Cannot find class: Menu
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:117)
at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:130)
at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:101)
... 196 more
Caused by: java.lang.ClassNotFoundException: Cannot find class: Menu
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:190)
at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:89)
at org.apache.ibatis.io.Resources.classForName(Resources.java:256)
at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:113)
... 198 more
Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value f
这是咋回事？
