我正在研究基于Spring MVC的Web应用程序，其中有两个数据源，为此我需要维护两个事务**DataSourceTransactionManager**，
我什么也没做，只是复制了EXISTING Txn交易代码段并根据其他数据源对其进行了修改，请看看我的
app-ctx.xml
<!----- EXISTING Txn-------->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!----- NEWLY ADDED Txn-------->
<bean id="erptransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourcePayroll" />
</bean>
现在服务类，正是我需要使用的地方。
package com.awzpact.prayas.service;
import com.awzpact.prayas.dao.HRMSPickSalaryDataDAO;
import com.awzpact.uam.domain.SalaryDetailReport;
import com.awzpact.uam.domain.Userdetail;
import com.awzpact.uam.exceptions.MyExceptionHandler;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.stereotype.Service;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;
/**
*
* @author jack
*/
@Service
public class NewPayrollService {
final TransactionDefinition erpTxnDefination = new DefaultTransactionDefinition();
final TransactionDefinition prayasTxnDefination = new DefaultTransactionDefinition();
final int BATCH_SIZE = 500;
public void getSalarayData(final String yearMonth, final String regionId, final String circleId, final Userdetail loginUser) {
final String tableSuffix = yearMonth.substring(4, 6) + yearMonth.substring(0, 4);
final TransactionStatus erpTransaction = erpTransactionManager.getTransaction(erpTxnDefination);
try {
List<SalaryDetailReport> list = hRMSPickSalaryDataDAO.findAll(yearMonth, regionId, circleId);
} catch (Exception e) {
}
final TransactionStatus prayasTransaction = prayasTransactionManager.getTransaction(prayasTxnDefination);
}
@Autowired
DataSourceTransactionManager prayasTransactionManager;
@Autowired
DataSourceTransactionManager erpTransactionManager;
@Autowired
HRMSPickSalaryDataDAO hRMSPickSalaryDataDAO;
}
错误日志
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'newPayrollService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.jdbc.datasource.DataSourceTransactionManager com.awzpact.prayas.service.NewPayrollService.prayasTransactionManager; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.datasource.DataSourceTransactionManager] is defined: expected single matching bean but found 2: transactionManager,erptransactionManager
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:838)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537)
at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5003)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5517)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.StandardContext.reload(StandardContext.java:4020)
at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:1012)
at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:381)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.jdbc.datasource.DataSourceTransactionManager com.awzpact.prayas.service.NewPayrollService.prayasTransactionManager; nested exception is org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.datasource.DataSourceTransactionManager] is defined: expected single matching bean but found 2: transactionManager,erptransactionManager
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
... 44 more
Caused by: org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.datasource.DataSourceTransactionManager] is defined: expected single matching bean but found 2: transactionManager,erptransactionManager
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1126)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545)
... 46 more
我无法弄清楚，我将bean id隔离为一个，同时也引用了另一个datasource，即dataSourcePayroll。
请让我知道实现此目标的最佳解决方案，或者是否有其他替代解决方案？
答案 0 :(得分：1)
其中一种方法是指定咖啡豆的名称
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" name="oldOne">
<property name="dataSource" ref="dataSource" />
</bean>
<!----- NEWLY ADDED Txn-------->
<bean id="erptransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" name="newOne">
<property name="dataSource" ref="dataSourcePayroll" />
</bean>
然后使用预选赛
package com.awzpact.prayas.service;
import com.awzpact.prayas.dao.HRMSPickSalaryDataDAO;
import com.awzpact.uam.domain.SalaryDetailReport;
import com.awzpact.uam.domain.Userdetail;
import com.awzpact.uam.exceptions.MyExceptionHandler;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.stereotype.Service;
import org.springframework.transaction.TransactionDefinition;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.DefaultTransactionDefinition;
/**
*
* @author jack
*/
@Service
public class NewPayrollService {
final TransactionDefinition erpTxnDefination = new DefaultTransactionDefinition();
final TransactionDefinition prayasTxnDefination = new DefaultTransactionDefinition();
final int BATCH_SIZE = 500;
public void getSalarayData(final String yearMonth, final String regionId, final String circleId, final Userdetail loginUser) {
final String tableSuffix = yearMonth.substring(4, 6) + yearMonth.substring(0, 4);
final TransactionStatus erpTransaction = erpTransactionManager.getTransaction(erpTxnDefination);
try {
List<SalaryDetailReport> list = hRMSPickSalaryDataDAO.findAll(yearMonth, regionId, circleId);
} catch (Exception e) {
}
final TransactionStatus prayasTransaction = prayasTransactionManager.getTransaction(prayasTxnDefination);
}
@Autowired
@Qualifier("oldOne")
DataSourceTransactionManager prayasTransactionManager;
@Autowired
@Qualifier("newOne")
DataSourceTransactionManager erpTransactionManager;
@Autowired
HRMSPickSalaryDataDAO hRMSPickSalaryDataDAO;
}
答案 1 :(得分：1)
问题是您在Bean定义中获得了不同的Bean ID，并且正在使用具有不同名称的该属性。因此，Spring容器无法识别为prayasTransactionManager和erpTransactionManager ..
解决方案是将相同的bean id用于bean定义，用作Property name。 在您的情况下：
<!----- EXISTING Txn-------->
<bean id="prayasTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!----- NEWLY ADDED Txn-------->
<bean id="erpTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSourcePayroll" />
</bean>
或将其与您的旧代码一起使用。
@Autowired
@Qualifier("transactionManager")
DataSourceTransactionManager prayasTransactionManager;
@Autowired
@Qualifier("erptransactionManager")
DataSourceTransactionManager erpTransactionManager;
P.S：给出bean ID和属性名（Dependency）的最佳实践是使用camelCase模式和有意义的名字。