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HarmonyOS
我是 Spring 和 JPA 的新手，浪费了 5 天时间，在互联网上搜索没有结果。我想将对象保存到 SQL SERVER，连接正确但是当我写 .flush() 时出现异常
嵌套异常是 javax.persistence.TransactionRequiredException：没有事务正在进行
这是我的 jpaContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<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"
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-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<context:annotation-config />
<context:component-scan base-package="com.misha.service"/>
<context:component-scan base-package="com.misha.repository"/>
<context:component-scan base-package="com.misha.model"/>
<bean
class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="myEntityManager"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.misha.model"/>
<property name="persistenceUnitName" value="test" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">create</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</prop>
</props>
</property>
</bean>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver" />
<property name="url"
value="jdbc:jtds:sqlserver://127.0.0.1;instance=SQLEXPRESS;DatabaseName=misha" />
<property name="username" value="sa" />
<property name="password" value="root" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="myEntityManager" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>
这是我的 persistence.xml 文件：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="test" >
<class>com.misha.model.Table1</class>
</persistence-unit>
</persistence>
这是我的服务实现：
@Service("manService")
public class SaveManImpl implements SaveMan {
//
@Autowired
private ManRepositoryImpl manRepo;
@Transactional
public Table1 save(Table1 table) {
manRepo.save(table);
return null;
}
}
最后是我的存储库实现：
@Repository("manRepository")
public class ManRepositoryImpl implements ManRepository {
@PersistenceContext
private EntityManager em;
public Table1 save(Table1 table){
em.persist(table);
em.flush();
return table;
}
}
从异常来看，Spring 看不到 @Transactional 注释，对吗？我试着把注解放在repository save方法上面，没有结果，在这个上面的Service save方法之后，这里也是一样的。提前致谢
我在我的控制器中调用保存方法
package com.misha.controllers;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.RequestMapping;
import com.misha.model.Table1;
import com.misha.service.SaveMan;
@Controller
public class ManController {
@Autowired
SaveMan saveMan; // this is service interface
@RequestMapping(value="/test1")
public String saveMan(){
Table1 tab = new Table1();
tab.setName("name");
saveMan.save(tab);
return "saveMan";
}
}
错误堆栈：
SEVERE: Servlet.service() for servlet [fitTrackerServlet] in context with path [/test] threw exception [Request processing failed; nested exception is javax.persistence.TransactionRequiredException: no transaction is in progress] with root cause
javax.persistence.TransactionRequiredException: no transaction is in progress
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.checkTransactionNeeded(AbstractEntityManagerImpl.java:1171)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:1332)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:365)
at com.sun.proxy.$Proxy20.flush(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:240)
at com.sun.proxy.$Proxy20.flush(Unknown Source)
at com.misha.repository.ManRepositoryImpl.save(ManRepositoryImpl.java:21)
at com.misha.service.SaveManImpl.save(SaveManImpl.java:19)
at com.misha.controllers.ManController.saveMan(ManController.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:175)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:421)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:409)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:774)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
弹簧配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
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-3.1.xsd">
<mvc:annotation-driven />
<!--<mvc:resources location="pdfs" mapping="/pdfs/**" />
<mvc:resources location="/resources" mapping="/resources/**"/> -->
<context:component-scan base-package="com.misha.controllers"></context:component-scan>
<context:component-scan base-package="com.misha.repository" />
<context:component-scan base-package="com.misha.service" />
<context:annotation-config/>
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
<property name="order" value="0"></property>
</bean>
<bean id="contentNegotiatingViewResolver"
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
<entry key="request" value="text/html" />
</map>
</property>
<property name="favorPathExtension" value="false" />
<property name="favorParameter" value="true" />
<property name="defaultViews">
<list>
</list>
</property>
</bean>
<bean class="org.springframework.context.support.ResourceBundleMessageSource" >
<property name="basename" value="WEB-INF/messages"></property>
</bean>
</beans>
原文由 Misha Akopov 发布，翻译遵循 CC BY-SA 4.0 许可协议
java
您有两个 Spring 上下文：
主要的一个，由 jpaContext.xml 配置，其中来自服务和存储库包的 bean 被扫描，并由事务拦截器代理。
mvc 一个，由另一个 xml 文件（您没有命名）配置，其作用是描述应用程序的 MVC 部分，即定义和配置例如控制器 bean、视图解析器等。此上下文是一个主要的孩子。
问题是您还扫描了此子上下文中的服务和存储库包。因此，您最终会得到每个服务和存储库的两个实例：
因此，控制器被注入了来自与控制器相同上下文的服务：非事务性服务。
要确认这一点，您可以在 bean 的构造函数中添加跟踪并查看它们被实例化了多少次。
为了避免这个问题，有两种解决方案：