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PersonDao Mappper Proxy #233

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AhYi8 opened this issue Sep 23, 2023 · 4 comments
Open

PersonDao Mappper Proxy #233

AhYi8 opened this issue Sep 23, 2023 · 4 comments

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@AhYi8
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AhYi8 commented Sep 23, 2023

新项目启动报这个异常:

java.lang.NullPointerException: null
	at org.nebula.contrib.ngbatis.proxy.MapperProxy.invoke(MapperProxy.java:73) ~[ngbatis-1.1.3.jar:1.1.3]
	at com.ayi.ngbatis.dao.PersonDao$Proxy.select1(Unknown Source) ~[na:na]
	at com.ayi.ngbatis.service.impl.PersonServiceImpl.select1(PersonServiceImpl.java:79) ~[classes/:na]
	at com.ayi.ngbatis.controller.PersonController.select1(PersonController.java:18) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_321]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_321]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_321]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_321]
	......

启动类

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项目结构

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Dao 类

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ServiceImp 类

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@AhYi8
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AhYi8 commented Sep 23, 2023

哪位大佬知道为啥,刚学,踩的坑太多了

@AhYi8
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AhYi8 commented Sep 23, 2023

这是Mapper.xml 文件
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@CorvusYe
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新项目启动报这个异常:

java.lang.NullPointerException: null
	at org.nebula.contrib.ngbatis.proxy.MapperProxy.invoke(MapperProxy.java:73) ~[ngbatis-1.1.3.jar:1.1.3]
	at com.ayi.ngbatis.dao.PersonDao$Proxy.select1(Unknown Source) ~[na:na]
	at com.ayi.ngbatis.service.impl.PersonServiceImpl.select1(PersonServiceImpl.java:79) ~[classes/:na]
	at com.ayi.ngbatis.controller.PersonController.select1(PersonController.java:18) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_321]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_321]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_321]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_321]
	......

启动类

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这里的报空是因为基本包的内置组件没有扫描到,可以改成 scanBasePackages = { "org.nebula.contrib.ngbatis", "com.ayi.ngbatis" }

Dao 类

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这里的@Component可以不需要,直接去掉就可以,扫描的发现是通过 xml 的 namespace 完成的,加了这个注解会形成二次代理,从而导致报错

@Childe-Mu
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按照上述方式修改,还是报错,追踪下来,看到是这个
image
bean没有被构建,还有其他需要修改的吗?

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