1.看tomcat错误日记
报错信息：StandardContext.startInternal One or more listeners failed to start. Full details will be found in t
在项目的WEB-INF/classes目录下新建一个文件叫logging.properties，内容如下
handlers = org.apache.juli.FileHandler, java.util.logging.ConsoleHandler
############################################################
# Handler specific properties.
# Describes specific configuration info for Handlers.
############################################################
org.apache.juli.FileHandler.level = FINE
org.apache.juli.FileHandler.directory = ${catalina.base}/logs
org.apache.juli.FileHandler.prefix = error-debug.
java.util.logging.ConsoleHandler.level = FINE
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
重新启动tomcat，便可以在tomcat的 logs目录下生产error开头的错误日记。
2.java.lang.IncompatibleClassChangeError: Class org.springframework.core.type.classreading.AnnotationMetadataReadingVisitor
原因是jar包冲突引起的。
spring-core.jar包里已经有了asm
固不用单独导入asm包
方案一：全部的spring引用换成3.4.2；这个版本里面core 有as-common文件夹
3.
http://www.imooc.com/wenda/detail/317567
把“，”变成"#"就可以解决
4.
The valid characters are defined in RFC 7230 and RFC 3986 错误
http://blog.csdn.net/sunpeng_sp/article/details/58309190
5.项目在war打包后，jetty单元测试总是报下面的错误
--------------------------------------------------------------------------------------------------
HTTP ERROR 500
Problem accessing /customer/customer/toList. Reason:
Server Error
Caused by:
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.sishuok.architecture1.customermgr.dao.CustomerDAO.getByConditionPage
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:184)
at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)
at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)
at com.sun.proxy.$Proxy31.getByConditionPage(Unknown Source)
at com.sishuok.architecture1.common.service.BaseService.getByConditionPage(BaseService.java:37)
at com.sishuok.architecture1.customermgr.web.CustomerController.toList(CustomerController.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
-------------------------------------------------------------------------------------------------------
进过一个星期的调查调试发现在target下的map文件没有生产导致，不能映射出错；
终于找到该处错误，太开心了；被折磨好一阵子。
接下来看为啥有时候能生成的问题
6.maven的主项目和子模块在clean后，如果直接运行子模块会出现莫名的报错，
这时必须把项目用maven 强制update，错误就可以消失
