错误:域中出现java.lang.NullPointerException。SpeakerRecog.test
speakermapper 为 null,错误位于 speakermapper.insertUserAndEnrollmentId(userid, enrollmentid)
上,它抛出 Java null 指针异常。数据源是在控制台中创建的。我尝试添加注释,例如@Configuration
,工具
,它仍然不起作用。我正在尝试将数据插入本地主机的数据库表中。它与线程“为什么我的 Spring @Autowired 字段为空?”不同,因为我没有创建新的构造函数,但我遵循了那里给出的建议,但它仍然不起作用
WebService java文件:
package domain;
import javax.jws.WebMethod;
import javax.jws.WebService;
import mapper.Speakermapper;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;
import org.springframework.beans.factory.annotation.Autowired;
@WebService(serviceName = "SpeakerRecognitionWS")
public class SpeakerRecog extends SpringBeanAutowiringSupport{
@Autowired
private Speakermapper speakermapper;
@WebMethod
public String test(){
String userid = "111";
String enrollmentid = "111";
try{
speakermapper.insertUserAndEnrollmentId(userid, enrollmentid);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
这是Speakermapper.java的文件:
package mapper;
import org.apache.ibatis.annotations.Param;
public interface Speakermapper {
public void insertUserAndEnrollmentId(@Param("userid") String userid,
@Param("enrollmentid") String enrollmentid);
}
**以下是Speakermapper.xml:
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace = "mapper.Speakermapper">
<insert id = "insertUserAndEnrollmentId" >
Insert into SpeakerIds
(userid, enrollmentid)
Values (#{userid}, #{enrollmentid})
</insert>
</mapper>
**这里是applicationContext.xml:这个xml上有错误吗?我搞不清楚。
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation= "http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<context:component-scan base-package="domain"/>
<context:component-scan base-package="mapper"/>
<bean id="SpeakerRecog" class="domain.SpeakerRecog" />
<bean id="smapper" class="mapper.speakermapper" />
<bean id="dataSourceSpeaker" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="Speaker"/>
</bean>
<bean id="sqlSessionFactorySpeaker" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSourceSpeaker"/>
<property name="typeAliasesPackage" value="domain"/>
<property name="configLocation" value="/WEB-INF/mybatis-config.xml"/>
</bean>
<bean id="mapperSpeaker" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="mapper" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactorySpeaker" />
</bean>
</beans>
您可以显式地将其标记为服务,或者不使用接口而是使用类。
又看了一遍-
<bean id="smapper" class="mapper.speakermapper" />
带大S的扬声器映射器
<bean id="smapper" class="mapper.Speakermapper" />
package mapper;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Service;
@Service
public class Speakermapper {
public void insertUserAndEnrollmentId(@Param("userid") String userid,
@Param("enrollmentid") String enrollmentid);
}
更新3
<bean id="speakermapper" class="mapper.Speakermapper" />
<bean id="SpeakerRecog" class="domain.SpeakerRecog" >
<property name="speakermapper" ref="speakermapper" />
</bean>
还请检查此链接:
Web服务中的Spring Autowired无法工作