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1.对象的转型异常

2.The package org.springframework.context is accessible from more than one module: spring.aspects, spring.context

在java build path -》libraries-》 选择classpath-》add extenal jars   导入jar包；Moudlepath下面一般是JRE system Library;Classpath一般是导入的其他jar包

3.IDEA中Spring配置错误：class path resource [.xml] cannot be opened because it does not exist.

private static ApplicationContext context;

context = new ClassPathXmlApplicationContext("com/lambo/Beans.xml");

      HelloWorld obj = (HelloWorld) context.getBean("helloWorld");

      obj.getMessage();

解决：把xml的路径写完全，包com.lambo下的app.xml 可以写成com/lambo/app.xml