创建maven出现的问题

1.Maven工程时添加的war包war报错
http://blog.youkuaiyun.com/qq_30507287/article/details/69055548

2.Unable to create project from archetype [org.apache.maven.archetypes:maven-archetype-quickstart:1.1]
项目已存在

3.
将这里的2.3改为3.0

参考：http://blog.sina.com.cn/s/blog_67e192090102v6u0.html

4.使用MyBatis Generator自动创建代码
参考：http://blog.youkuaiyun.com/zhshulin/article/details/23912615

there were warnings.说明配置不正确

正确！

5.报错：

java.lang.IllegalStateException: Failed to load ApplicationContext at
org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99)
at
org.springframework.test.context.DefaultTestContext.getApplicationContext(DefaultTestContext.java:101)
at
org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109)
at
org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75)
at
org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:319)
at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:212) at
org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallab

原因：自动生成代码后，要将xml文件中的包名改为自己的包名

6.An error has occurred. See error log for more details. java.lang.NullPointer
删除项目重新导入