WPF之家

 该教程的主要内容包括以下内容：
1.Lambda表达式
2.函数式接口
3.方法引用与构造器引用
4.Stream API
5.接口中的默认方法与静态方法
6.新时间日期API
7.其他新特性

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intellij idea默认下的代码提示是区分大小写的，通过设置可以不区分大小写进行提示.

第一步：选择File->Setting

第二步：找到 Editor->General->Code Completion 

第三步：取消Match case前的勾选保存即可。

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'commonsMultipartResolver': Lookup method resolution failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.web.multipart.commons.CommonsMultipartResolver] from ClassLoader [jdk.internal.loader.ClassLoaders$AppClassLoader@78308db1]

Error creating bean with name 'jsonMessageConverter': Failed to introspect bean class出现这个错误是因为：

 缺少jackson依赖

 Constructor threw exception; nested exception is java.lang.NoClassDefFoundEr

Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/exc/InvalidDefinitionException的根本原因在于jar包

• Spring @WebAppConfiguration Annotation Example

@ContextConfiguration这个注解通常与@RunWith(SpringJUnit4ClassRunner.class)联合使用用来测试

当一个类添加了注解@Component,那么他就自动变成了一个bean，就不需要再Spring配置文件中显示的配置了。把这些bean收集起来通常有两种方式，Java的方式和XML的方式。当这些bean收集起来之后，当我们想要在某个测试类使用@Autowired注解来引入这些收集起来的bean时，只需要给这个测试类添加@ContextConfiguration注解来标注我们想要导入这个测试类的某些bean。

 Caused by: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'WithDeptResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: WithDeptResultMap
 at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:100)
 at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:69)
 at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:132)
 at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:125)
 at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:115)
 ... 44 more
Caused by: org.apache.ibatis.type.TypeException: Could not resolve type alias 'WithDeptResultMap'.  Cause: java.lang.ClassNotFoundException: Cannot find class: WithDeptResultMap
 at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:114)
 at org.apache.ibatis.builder.BaseBuilder.resolveAlias(BaseBuilder.java:127)
 at org.apache.ibatis.builder.BaseBuilder.resolveClass(BaseBuilder.java:98)
 ... 48 more
Caused by: java.lang.ClassNotFoundException: Cannot find class: WithDeptResultMap
 at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:188)
 at org.apache.ibatis.io.ClassLoaderWrapper.classForName(ClassLoaderWrapper.java:87)
 at org.apache.ibatis.io.Resources.classForName(Resources.java:254)
 at org.apache.ibatis.type.TypeAliasRegistry.resolveAlias(TypeAliasRegistry.java:110)
 ... 50 more

SSM整合，在进行单元测试时，会报下面的警告。

log4j:WARN No appenders could be found for logger (org.springframework.test.context.junit4.SpringJUnit4ClassRunner).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.