1、启动错误java.lang.IllegalArgumentException
问题：javax.servlet.ServletException: Servlet.init() for servlet springMVC threw exception
原因：JDK版本与Spring MVC 版本不对应造成的。
解决：Spring 3.x对应1.7.x或以下版本JDK；Spring 4.x对应JDK 1.8.x
2、程序可以正常使用，但xml开头出现红叉
Referenced file contains errors (http://www.springframework.org/schema/context/spring-context-3.2.xsd). For more information, right click on the message in the Problems View and select “Show Details…”
解决：刚开始我用的校园网，换个网，这个问题就不会出现了。换网之后，鼠标右键validate验证springmvc.xml
校园网无法读取xsd文件，Failed to read schema document ‘http://www.springframework.org/schema/context/spring-context.xsd’,
3、程序可以正常使用，但是配置扫描显示出错
Multiple annotations found at this line:
- cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element ‘context:component-scan’.
- schema_reference.4: Failed to read schema document ‘http://www.springframework.org/schema/context/spring-context.xsd’,
because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not xsd:schema.
解决：刚开始我用的校园网，换个网，这个问题就不会出现了。问题2和3与xsi:schemaLocation=" "的引号中最后一位有无空格，没有任何关系。此外即使我添加了spring-context.xsd也米有任何用处。
4、spring官网下载文件的方法
官网下载jar、源码、xsd等，可参考文章
5、JSP页面
Multiple annotations found at this line:
- The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path
- - Line breakpoint:add.jsp [line: 1]
解决：右键项目——build path——configure build path——Add Library –> server Runtime -> Click Next，选择tomcat即可
6、java.lang.NoClassDefFoundError: org/springframework/asm/ClassVisitor
原因：缺少jar包
org.springframework.asm-3.0.5.RELEASE.jar
解决：导入asm包即可