attempted to return null from a method with a primitive return type (int).

错误产生的场景

dao层接口如下

int getResourceDataNumsByTitle(String title);

mapper.xml 中sql语句如下

<select id="getResourceDataNumsByTitle" parameterType="java.lang.String" resultType="java.lang.Integer">SELECT * FROM t_resourceData where title = #{title}
</select>

Service层

for(ResourceData r : resourceDatas){if(!(getResourceDataNumsByTitle(r.getTitle()) > 0)){resourceMapper.insertOneResourceData(r);LOG.info(r.getTitle()+"已插入");}
}

报错如下

org.apache.ibatis.binding.BindingException: Mapper method 'com.haoeasy.news.mapper.ResourceMapper.getResourceDataNumsByTitle attempted
to return null from a method with a primitive return type (int).at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:93)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)at com.sun.proxy.$Proxy71.getResourceDataNumsByTitle(Unknown Source)at com.haoeasy.news.serviceimpl.ResourceServiceImpl.getResourceDataNumsByTitle(ResourceServiceImpl.java:39)at com.haoeasy.news.serviceimpl.ResourceServiceImpl.insertOneResourceData(ResourceServiceImpl.java:23)at com.haoeasy.news.news.NewsApplicationTests.getUrlContent(NewsApplicationTests.java:105)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)at org.junit.runners.ParentRunner.run(ParentRunner.java:363)at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)at org.junit.runner.JUnitCore.run(JUnitCore.java:137)at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
0
2019-04-12 20:30:00.171  INFO 10648 --- [       Thread-2] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2019-04-12 20:30:00.177  INFO 10648 --- [       Thread-2] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closedProcess finished with exit code 0

错误原因

分析

本次报错的原因在于sql语句未查询到数据，返回为null。而我们定义的dao层方法是返回为int，就会出现如下这样的提示：
return null from a method with a primitive return type (int).（试图从具有原始返回类型（int）的方法返回null）
Ingeter是int的包装类，int的初值为0，Ingeter的初值为null

解决方式

将dao层的返回类型改为Integer即可。

attempted to return null from a method with a primitive return type (int).相关推荐

Mybatis中的attempted to return null from a method with a primitive return type (int).异常
错误截图: org.apache.ibatis.binding.BindingException: Mapper method 'com.shop_demo.dao.AdminDAO.getAdmin ...
Mybatis：Mapper method attempted to return null from a method with a primitive return type (int)
Mybatis中 Mapper method attempted to return null from a method with a primitive return type (int)错误本 ...
sql报错解决方案：attempted to return null from a method with a primitive return type (int)
问题现象 idea执行查询数量语句控制台报错:attempted to return null from a method with a primitive return type (int). 解决 ...
关于mybatis的报错 attempted to return null from a method with a primitive return type (int）
https://blog.csdn.net/kisscatforever/article/details/77801060 一.前言在往常敲代码的时候没有留意过int和Integer的区 ...
Mybatis-增删改查踩坑- attempted to return null from a method with a primitive return type (int).
错误在编写插入数据时一直报如下错误: attempted to return null from a method with a primitive return type (int). 原来的代码 ...
Mybatis异常错误：Mapper method attempted to return null from a method with a primitive return type (int)
在mybatis搭建时出现错误:Mapper method attempted to return null from a method with a primitive return type (i ...
error:attempted to return null from a method with a primitive return type (int）
1,起因今天老大让改bug,说有个模块数据提交不了,让我看看...检查服务器发现这个报错..attempted to return null from a method with a primiti ...
mapper method attempted to return null from a method with a primitive return type (int)
一.场景和背景工具:mybatis + pgsql dao代码: int selectMaxAgeBySex(String sex); 查询性别是女生的最大年龄 sql: <select id ...
insertRole attempted to return null from a method with a primitive return type
练习myBatis,向数据库插入一条数据,期望返回1,结果报错. 多次查找,结果是Mapper对应的xml文件中sql语句的节点写成select了,应该是insert

attempted to return null from a method with a primitive return type (int).

错误产生的场景

错误原因

attempted to return null from a method with a primitive return type (int).相关推荐

最新文章

热门文章