為什么我堅持不會發生什么？

Question

我希望我不會問你已經回答的問題，但我無法理解我的問題...我解釋說：

我使用Spring和Hibernate，我有一個Manager接口，以及一個實現我的界面的Manager。 經理是這樣的：

@Service
@Transactional
public class ManagerImpl implements Manager {
    @PersistenceContext(type = PersistenceContextType.TRANSACTION, unitName="Service")
    private EntityManager em;

    public void storeHistoricMessage(...params...) throws DBException{
        HistoricMessage historicMessage = new HistoricMessage(); 
        // ... initialization of historicMessage
        try {
            em.persist(historicMessage);
        }
        catch (Exception e){
            // process the exception if exists... 
        }
    }
}

我這樣稱呼我的服務：

@Service
public class OtherManager {
    @Autowired
    private Manager manager;

    public void storeHistoricMessage(...params...) {
        manager.storeHistoricMessage(...params...);
    }
}

我的應用程序上下文定義如下：

<?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:aop="http://www.springframework.org/schema/aop"
    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-2.5.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/tx 
           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

    <context:component-scan base-package="package" />

    <bean id="JDBCPropertyConfigurer_service"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="properties" ref="JDBCProperties_service" />
        <property name="ignoreUnresolvablePlaceholders" value="true" />
    </bean>

    <bean id="JDBCProperties_service"
        class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="location" value="classpath:jdbc.properties" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager_service"/>

    <bean id="transactionManager_service" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory_service" />
    </bean>

    <!-- datasource -->
    <bean id="dataSource_service"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${database_service.driverClassName}" />
        <property name="url" value="${database_service.url}" />
        <property name="username" value="${database_service.username}" />
        <property name="password" value="${database_service.password}" />
    </bean>

    <!-- JPA config -->
    <bean id="entityManagerFactory_service"
        class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource_service" />
        <property name="persistenceXmlLocation" value="classpath*:META-INF/persistence.xml" />
        <property name="persistenceUnitName" value="Service" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <!--
                    <property name="generateDdl" value="${jpa.generateDdl}" />
                    <property name="showSql" value="${jpa.showSql}" /> <property
                    name="hbm2ddl.auto" value="${jpa.hbm2ddl}" />
                -->
            </bean>
        </property>
    </bean>

    <bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
</beans>

最后，我的persistence.xml是這樣的：

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
    version="1.0">

    <persistence-unit name="Service" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>package.HistoricMessage</class>

        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLInnoDBDialect" />
            <property name="hibernate.archive.autodetection" value="class, hbm" />
            <property name="hibernate.show_sql" value="false" />
            <property name="hibernate.format_sql" value="false" />
            <property name="hibernate.hbm2ddl.auto" value="${hibernate.hbm2ddl.auto}" />
        </properties>
    </persistence-unit> 
</persistence>

問題是，當我堅持，沒有任何反應：沒有插入數據庫，沒有錯誤信息，沒有異常......我做了很多測試，我也許有一些幫助：

• 如果我嘗試用em.find（）取回我的對象​​，我得到它...緩存優化？
• 如果我捕獲它，並在啟動服務后重命名數據庫中的表，我沒有錯誤，他總是很高興...
• 如果我嘗試em.flush（），它會拋出異常，因為沒有進行任何事務...

最后，這里是我可以看到的TRACE日志：

DEBUG 12-01 10:50:01,362 (SessionImpl.java:<init>:220)  -opened session at timestamp: 13263618013
DEBUG 12-01 10:50:01,362 (JDBCTransaction.java:begin:54)  -begin
DEBUG 12-01 10:50:01,362 (ConnectionManager.java:openConnection:421)  -opening JDBC connection
DEBUG 12-01 10:50:01,363 (DriverManagerDataSource.java:getConnectionFromDriver:163)  -Creating new JDBC DriverManager Connection to [jdbc:mysql://databaseurl]
DEBUG 12-01 10:50:01,378 (JDBCTransaction.java:begin:59)  -current autocommit status: true
DEBUG 12-01 10:50:01,379 (JDBCTransaction.java:begin:62)  -disabling autocommit
TRACE 12-01 10:50:01,380 (JDBCContext.java:afterTransactionBegin:214)  -after transaction begin
DEBUG 12-01 10:50:01,380 (JpaTransactionManager.java:doBegin:348)  -Exposing JPA transaction as JDBC transaction [SimpleConnectionHandle: com.mysql.jdbc.JDBC4Connection@1ff335bb]
TRACE 12-01 10:50:01,381 (TransactionSynchronizationManager.java:bindResource:186)  -Bound value [org.springframework.jdbc.datasource.ConnectionHolder@184c9860] for key [org.springframework.jdbc.datasource.DriverManagerDataSource@65499154] to thread [http-8001-Processor5]
TRACE 12-01 10:50:01,381 (TransactionSynchronizationManager.java:bindResource:186)  -Bound value [org.springframework.orm.jpa.EntityManagerHolder@4ca7d316] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@28ce2c57] to thread [http-8001-Processor5]
TRACE 12-01 10:50:01,381 (TransactionSynchronizationManager.java:initSynchronization:261)  -Initializing transaction synchronization
TRACE 12-01 10:50:01,382 (TransactionAspectSupport.java:prepareTransactionInfo:290)  -Getting transaction for [package.storeHistoricMessage]
storeHistoricMessage (begin of my function)
DEBUG 12-01 10:50:01,382 (EntityManagerFactoryUtils.java:doGetTransactionalEntityManager:194)  -Opening JPA EntityManager
DEBUG 12-01 10:50:01,388 (EntityManagerFactoryUtils.java:doGetTransactionalEntityManager:199)  -Registering transaction synchronization for JPA EntityManager
DEBUG 12-01 10:50:01,389 (SessionImpl.java:<init>:220)  -opened session at timestamp: 13263618013
TRACE 12-01 10:50:01,392 (TransactionSynchronizationManager.java:bindResource:186)  -Bound value [org.springframework.orm.jpa.EntityManagerHolder@69851576] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@20442c19] to thread [http-8001-Processor5]
TRACE 12-01 10:50:01,393 (IdentifierValue.java:isUnsaved:77)  -id unsaved-value strategy UNDEFINED
TRACE 12-01 10:50:01,394 (AbstractSaveEventListener.java:getEntityState:514)  -transient instance of: package.HistoricMessage
TRACE 12-01 10:50:01,394 (DefaultPersistEventListener.java:entityIsTransient:124)  -saving transient instance
DEBUG 12-01 10:50:01,397 (AbstractSaveEventListener.java:saveWithGeneratedId:112)  -generated identifier: ***identifier***, using strategy: org.hibernate.id.Assigned
TRACE 12-01 10:50:01,397 (AbstractSaveEventListener.java:performSave:153)  -saving [package.HistoricMessage#***identifier***]
end of my function
TRACE 12-01 10:50:01,399 (TransactionAspectSupport.java:commitTransactionAfterReturning:319)  -Completing transaction for [package.storeHistoricMessage]
TRACE 12-01 10:50:01,400 (AbstractPlatformTransactionManager.java:triggerBeforeCommit:903)  -Triggering beforeCommit synchronization
TRACE 12-01 10:50:01,400 (AbstractPlatformTransactionManager.java:triggerBeforeCompletion:916)  -Triggering beforeCompletion synchronization
TRACE 12-01 10:50:01,401 (TransactionSynchronizationManager.java:doUnbindResource:232)  -Removed value [org.springframework.orm.jpa.EntityManagerHolder@69851576] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@20442c19] from thread [http-8001-Processor5]
DEBUG 12-01 10:50:01,401 (EntityManagerFactoryUtils.java:closeEntityManager:313)  -Closing JPA EntityManager
TRACE 12-01 10:50:01,401 (SessionImpl.java:close:273)  -closing session
TRACE 12-01 10:50:01,402 (ConnectionManager.java:cleanup:375)  -connection already null in cleanup : no action
DEBUG 12-01 10:50:01,402 (AbstractPlatformTransactionManager.java:processCommit:730)  -Initiating transaction commit
DEBUG 12-01 10:50:01,402 (JpaTransactionManager.java:doCommit:451)  -Committing JPA transaction on EntityManager [org.hibernate.ejb.EntityManagerImpl@27b71c12]
DEBUG 12-01 10:50:01,403 (JDBCTransaction.java:commit:103)  -commit
TRACE 12-01 10:50:01,403 (SessionImpl.java:managedFlush:337)  -automatically flushing session
TRACE 12-01 10:50:01,403 (JDBCContext.java:beforeTransactionCompletion:205)  -before transaction completion
TRACE 12-01 10:50:01,404 (SessionImpl.java:beforeTransactionCompletion:393)  -before transaction completion
DEBUG 12-01 10:50:01,405 (JDBCTransaction.java:toggleAutoCommit:193)  -re-enabling autocommit
DEBUG 12-01 10:50:01,406 (JDBCTransaction.java:commit:116)  -committed JDBC Connection
TRACE 12-01 10:50:01,407 (JDBCContext.java:afterTransactionCompletion:219)  -after transaction completion
DEBUG 12-01 10:50:01,407 (ConnectionManager.java:aggressiveRelease:404)  -aggressively releasing JDBC connection
DEBUG 12-01 10:50:01,408 (ConnectionManager.java:closeConnection:441)  -releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]
TRACE 12-01 10:50:01,408 (SessionImpl.java:afterTransactionCompletion:422)  -after transaction completion
TRACE 12-01 10:50:01,409 (AbstractPlatformTransactionManager.java:triggerAfterCommit:929)  -Triggering afterCommit synchronization
TRACE 12-01 10:50:01,409 (AbstractPlatformTransactionManager.java:triggerAfterCompletion:945)  -Triggering afterCompletion synchronization
TRACE 12-01 10:50:01,410 (TransactionSynchronizationManager.java:clearSynchronization:315)  -Clearing transaction synchronization
TRACE 12-01 10:50:01,410 (TransactionSynchronizationManager.java:doUnbindResource:232)  -Removed value [org.springframework.orm.jpa.EntityManagerHolder@4ca7d316] for key [org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean@28ce2c57] from thread [http-8001-Processor5]
TRACE 12-01 10:50:01,410 (TransactionSynchronizationManager.java:doUnbindResource:232)  -Removed value [org.springframework.jdbc.datasource.ConnectionHolder@184c9860] for key [org.springframework.jdbc.datasource.DriverManagerDataSource@65499154] from thread [http-8001-Processor5]
DEBUG 12-01 10:50:01,411 (JpaTransactionManager.java:doCleanupAfterCompletion:534)  -Closing JPA EntityManager [org.hibernate.ejb.EntityManagerImpl@27b71c12] after transaction
DEBUG 12-01 10:50:01,411 (EntityManagerFactoryUtils.java:closeEntityManager:313)  -Closing JPA EntityManager
TRACE 12-01 10:50:01,411 (SessionImpl.java:close:273)  -closing session
TRACE 12-01 10:50:01,412 (ConnectionManager.java:cleanup:375)  -connection already null in cleanup : no action

非常感謝你的幫助！

編輯：我很抱歉，我理解發生了什么，你無法找到，因為我真的簡化了我的項目的架構，我沒有告訴你原因：在這個項目中，我有幾個應用程序上下文文件和幾個數據源，所以我使用了幾次....而對於Spring 2.5，你只能有一個！ 所以我不能在我的第二個服務中使用交易...為了解決這個問題，我使用了這樣的aop：

<tx:advice id="txAdviceSelfCare" transaction-manager="transactionManager_service">
    <!-- the transactional semantics... -->
    <tx:attributes>
        <!-- other methods use the default transaction settings (see below) -->
        <tx:method name="*" />
    </tx:attributes>
</tx:advice>

<aop:config>
    <aop:pointcut id="ServiceManagerOperations"
        expression="execution(* package.ServiceManager.*(..))" />
    <aop:advisor advice-ref="txAdviceService"
        pointcut-ref="ServiceManagerOperations" />
</aop:config>

<!-- a PlatformTransactionManager is still required -->
<bean id="transactionManager_service" class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="entityManagerFactory_service" />
</bean>

感謝你的幫助 ！

Answer 1

你能嘗試檢查數據庫中真正發生的事情嗎？ 嘗試激活該數據庫上的日志工具，如果安裝了這樣的工具來嗅探Java代碼和數據庫服務器之間的網絡流量...它可能很有用......你可以要求你的JPA層顯示生成的SQL，它可以給你有趣的數據...我的2件jerome

Answer 2

更改您的catch塊以執行某些操作並查看其打印內容。

    try {
        em.persist(historicMessage);
    }
    catch (Exception e){
        e.printStackTrace(); // use a logger if available
    }

您還可以將以下屬性更改為true以查看正在發生的情況。

<property name="hibernate.show_sql" value="true" />

此外，養成使用合適的日志框架（如SLF4J）跟蹤方法進入/退出的習慣。

Answer 3

請注意，實際插入不會發生在em.persist語句中，因為調用是事務性的，所以你的try / catch根本不會做太多。 實際的持久化是在事務結束時完成的，即服務層調用完成時（從方法返回后）。 調試持久性時，這些知識至關重要。

Answer 4

驗證數據庫在哪里查看詳細信息。 日志清楚地表明提交已完成..

DEBUG 12-01 10:50:01,403 (JDBCTransaction.java:commit:103) -commit TRACE 12-01 10:50:01,403 (SessionImpl.java:managedFlush:337) -automatically flushing session TRACE 12-01 10:50:01,403 (JDBCContext.java:beforeTransactionCompletion:205) -before transaction completion TRACE 12-01 10:50:01,404 (SessionImpl.java:beforeTransactionCompletion:393) -before transaction completion DEBUG 12-01 10:50:01,405 (JDBCTransaction.java:toggleAutoCommit:193) -re-enabling autocommit DEBUG 12-01 10:50:01,406 (JDBCTransaction.java:commit:116) -committed JDBC Connection

Answer 5

將您的方法調用放在try catch中

public void storeHistoricMessage(...params...) {
    try {
       manager.storeHistoricMessage(...params...);
    } catch (Exception e) {
       e.printStackTrace(); // use a logger if available
    }
}

數據應該在manager.storeHistoricMessage方法調用（通過事務管理代理）結束時保留，而不是在em.persist調用。 你也可以試試em.flush：

try {
        em.persist(historicMessage);
        em.flush(); //force DB insert
    }...

看起來你並沒有看到一個異常，因為交易經理可能會拋出這個異常。