Question

我正在尝试改进我的设计，以便在我的网络应用中保留实体，特别是我如何处理来自service / dao层的异常。

我有一个非常简单的StrengthUnit实体，其中包含2个字段id和name，当然，用户在保存时只会输入name。< / p>

我处理ConstraintViolationException的旧（奇怪）方法是首先通过首先检查名称是否已分配给现有实体并且仅允许调用我的save方法来防止它首先发生。没＆＃39;吨。

由于Hibernate已经可以通过抛出ConstraintViolationException来处理这样的事情，我想利用它。我构建了我认为应该是可靠的逻辑，但我在特定场景中遇到错误：如果我尝试保留现有的name，我的代码会捕获异常，向结果对象添加错误并返回视图，错误低于name字段。如果我然后尝试保留一个有效的，不存在的name，则抛出此异常：

TransactionException：事务已标记为仅回滚;无法提交

看起来交易不是＆＃34;重置＆＃34;当异常发生并且我不太确定如何处理这个因为我自己不处理事务时，我的服务类标有@Transactional注释。

以下是相关代码：

控制器方法（我评论过我的旧风格，效果很好）：

@RequestMapping(value = {"/newStrengthUnit"}, method = RequestMethod.POST)
public String saveStrengthUnit(@Valid StrengthUnit strengthUnit, BindingResult result, ModelMap model) 
{
    if (result.hasErrors()) 
    {
        return "strengthUnitDataAccess";
    }
    /*if (!strengthUnitService.exists(strengthUnit.getName()))
    {
        strengthUnitService.saveStrengthUnit(strengthUnit);
    }
    else
    {
        FieldError error = new FieldError("name", "name", strengthUnit.getName() + " already exists!");
        result.addError(error);
        return "strengthUnitDataAccess";
    }*/
    try
    {
        strengthUnitService.saveStrengthUnit(strengthUnit);
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
        FieldError error = new FieldError("name", "name", strengthUnit.getName() + " already exists!");
        result.addError(error);
        return "strengthUnitDataAccess";
    }
    return "redirect:/strengthUnits/list";
}

服务：

@Service("strengthUnitService")
@Transactional
public class StrengthUnitServiceImpl implements StrengthUnitService
{
    @Autowired
    StrengthUnitDao dao;

    @Override
    public void saveStrengthUnit(StrengthUnit strengthUnit) 
    {
        dao.saveStrengthUnit(strengthUnit);
    }
}

主DAO（所有DAO扩展）：

public abstract class AbstractDao<PK extends Serializable, T> 
{
    @Autowired
    private SessionFactory sessionFactory;

    private final Class<T> persistentClass;

    @SuppressWarnings("unchecked")
    public AbstractDao()
    {
        this.persistentClass =(Class<T>) ((ParameterizedType) 
this.getClass().getGenericSuperclass()).getActualTypeArguments()[1];
    }

    protected Session getSession()
    {
        return sessionFactory.getCurrentSession();
    }

    protected CriteriaBuilder getCriteriaBuilder()
    {
        return sessionFactory.getCriteriaBuilder();
    }

    @SuppressWarnings("unchecked")
    public T getByKey(PK key) 
    {
        return (T) getSession().get(persistentClass, key);
    }

    public void persist(T entity) 
    {
        getSession().persist(entity);
    }

    public void delete(T entity)
    {
         getSession().delete(entity);
    }
}

DAO：

@Repository("strengthUnitDao")
public class StrengthUnitDaoImpl extends AbstractDao<Integer, StrengthUnit> 
implements StrengthUnitDao
{
    @Override
    public void saveStrengthUnit(StrengthUnit strengthUnit)
    {
        persist(strengthUnit);
    }
}

感谢您的帮助！

修改

根据要求，这是堆栈跟踪。第一个是当我尝试插入已知的重复值时，第二个是当我立即将值更改为已知的好值时。

违反唯一约束时的预期异常：

org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
at org.springframework.orm.hibernate5.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:241)
at org.springframework.orm.hibernate5.HibernateTransactionManager.convertHibernateAccessException(HibernateTransactionManager.java:755)
at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:594)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:761)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:487)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy467.saveStrengthUnit(Unknown Source)
at mdhis_webclient.controller.StrengthUnitController.saveStrengthUnit(StrengthUnitController.java:80)
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:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:745)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$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.hibernate.exception.ConstraintViolationException: could not execute statement
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:112)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:207)
at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2934)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3434)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:89)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:582)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:456)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1407)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:477)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3170)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2384)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:467)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:146)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$100(JdbcResourceLocalTransactionCoordinatorImpl.java:38)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:220)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:68)
at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:582)
... 48 more

Caused by: java.sql.SQLException: Violation of UNIQUE KEY constraint 'UK_fultcxtq254cq6p4g0s5ud9ca'. Cannot insert duplicate key in object 'dbo.tblStrengthUnit'. The duplicate key value is (%).
at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:372)
at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2988)
at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2421)
at net.sourceforge.jtds.jdbc.TdsCore.getMoreResults(TdsCore.java:671)
at net.sourceforge.jtds.jdbc.JtdsStatement.processResults(JtdsStatement.java:613)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQL(JtdsStatement.java:572)
at net.sourceforge.jtds.jdbc.JtdsPreparedStatement.executeUpdate(JtdsPreparedStatement.java:727)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:204)
... 66 more

添加后续有效名称时出现异常异常：

org.springframework.transaction.TransactionSystemException: Could not commit Hibernate transaction; nested exception is org.hibernate.TransactionException: Transaction was marked for rollback only; cannot commit
at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:586)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:761)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:487)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy467.saveStrengthUnit(Unknown Source)
at mdhis_webclient.controller.StrengthUnitController.saveStrengthUnit(StrengthUnitController.java:80)
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:497)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:745)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$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.hibernate.TransactionException: Transaction was marked for rollback only; cannot commit
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:217)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:68)
at org.springframework.orm.hibernate5.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:582)
... 48 more

Hibernate配置类（我的所有配置都是以编程方式完成的）：

@Configuration
@EnableTransactionManagement
@ComponentScan({"mdhis_webclient.configuration"})
public class HibernateConfiguration 
{
    @Autowired
    private Environment environment;

    @Bean
    public LocalSessionFactoryBean sessionFactory() 
    {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
    sessionFactory.setDataSource(dataSource());
    sessionFactory.setPackagesToScan(new String[] {"mdhis_webclient.entity"});
    sessionFactory.setHibernateProperties(hibernateProperties());
    return sessionFactory;
 }

@Bean
public DataSource dataSource() 
{
    DriverManagerDataSource dataSource = new DriverManagerDataSource();
    try
    {
        dataSource.setDriverClassName("net.sourceforge.jtds.jdbc.Driver");
        String hostName = InetAddress.getLocalHost().getHostName();
        if (hostName.compareTo("Martin-Beast") == 0)
        {
            dataSource.setUrl("jdbc:jtds:sqlserver://SRV2012MD;InstanceName=ADT;DatabaseName=MDHIS");
            dataSource.setUsername("sa");
            dataSource.setPassword("xxxxxxxx");
        }
        else if (hostName.compareTo("LCAN10472DQ32") == 0)
        {
            dataSource.setUrl("jdbc:jtds:sqlserver://localhost:1433/MDHIS;InstanceName=ADT");
            dataSource.setUsername("sa");
            dataSource.setPassword("xxxxxxxxxx");
        }
        else
        {
            dataSource.setUrl("jdbc:jtds:sqlserver://192.168.1.5:58616;DatabaseName=MDHIS");
            dataSource.setUsername("adt");
            dataSource.setPassword("xxxxxxxxxx");
        }
    }
    catch (Exception ignored) {}
    return dataSource;
}

private Properties hibernateProperties() 
{
    Properties properties = new Properties();
    properties.put("hibernate.connection.driver_class","net.sourceforge.jtds.jdbc.Driver");
    properties.put("hibernate.dialect", "org.hibernate.dialect.SQLServerDialect");
    properties.put("hibernate.show_sql", "true");
    //properties.put("hbm2ddl.auto", "create");
    //properties.put("hibernate.hbm2ddl.auto", "create");
    properties.put("javax.persistence.validation.mode", "none");
    return properties;        
}

@Bean
@Autowired
public HibernateTransactionManager transactionManager(SessionFactory s) 
{
    HibernateTransactionManager txManager = new HibernateTransactionManager();
    txManager.setSessionFactory(s);
    return txManager;
}

带有Transaction的Spring问题仅标记为回滚

0 个答案: