Spring搭建练习遇到的坑

1.Error:(7, 23) java: cannot find symbol
symbol: class ProceedingJoinPoint
location: class com.how2java.aspect.LoggerAspect

解决方法:

使用idea生成Spring框架.默认的jar里面没有这两个jar包,需要去maven仓库: https://mvnrepository.com/artifact/org.aspectj 找到下载这两个包

放入项目lib下,怎么添加参考: https://blog.csdn.net/chensanwa/article/details/79165528

2.

Exception in thread "main" org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 30 in XML document from class path resource [spring-config.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 30; columnNumber: 17; cvc-complex-type.2.4.c: The matching wildcard is strict,

Caused by: org.xml.sax.SAXParseException; lineNumber: 30; columnNumber: 17; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'aop:config'.
错误原因是:

在spring-configuration.xml配置<aop : config> 按ALT+ENTER 会自动导入需要的xmlns,默认导入的是:

xmlns:aop="http://www.springframework.org/schema/p"
引发错误
解决办法:参考 https://stackoverflow.com/questions/10062186/spring-aop-no-declaration-can-be-found-for-element-aopconfig

xmlns:aop="http://www.springframework.org/schema/aop"

xsi:schemaLocation="

http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"

3.
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: 

Error creating bean with name 'com.how2java.test.TestSping1': Unsatisfied dependency expressed through field 'c'; 
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: 
No qualifying bean of type 'com.how2java.pojo.Category' available: expected at least 1 bean which qualifies as autowire candidate. 
Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
出错原因:
未在spring-config.xml 中配置

<context:component-scan base-package="com.how2java.pojo"/>

而在测试类里面:Category在pake :com.how2java.pojo 包下面
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath:spring-config.xml"})
public class TestSping1 {
    @Autowired
    Category c;

    @Test
    public void test(){
        System.out.println(c.getName());
    }
}
解决方法:
在

在spring-config.xml 中配置

<context:component-scan base-package="com.how2java.pojo"/>