我讀過「這是一個最佳實踐,以保持業務邏輯組件和數據訪問類(通常在ApplicationContext中定義的)等中間層服務與Web相關的最佳實踐組件,如控制器和視圖解析器(在每個Dispatcher Servlet的WebApplicationContext中定義)。「春天mvc應用程序的正確配置
,並決定配置我的應用程序一樣,4個獨立的XML文件
的applicationContext.xml
<context:component-scan base-package="appname">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
dao.xml
<!-- MySQL JDBC Data Source-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://#{mysqlDbCredentials.hostname}:#{mysqlDbCredentials.port}/#{mysqlDbCredentials.name}"/>
<property name="username" value="#{mysqlDbCredentials.username}"/>
<property name="password" value="#{mysqlDbCredentials.password}"/>
</bean>
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="JpaPersistenceUnit" />
<property name="dataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true"/>
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5Dialect"/>
</bean>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.showSql">true</prop>
</props>
</property>
</bean>
<bean class="org.springframework.orm.jpa.JpaTransactionManager"
id="transactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>
和MVC-調度 - servlet.xml中
<mvc:annotation-driven />
<context:component-scan base-package="appname" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
web.xml(加載彈簧上下文)
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring/mvc-dispatcher-servlet.xml
</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<url-pattern>/spring/*</url-pattern>
</servlet-mapping>
<!-- Load spring beans definition files -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
/WEB-INF/spring/applicationContext.xml
/WEB-INF/spring/security.xml
/WEB-INF/spring/dao.xml
</param-value>
</context-param>
但我絕對困惑。 1)我不明白在這種情況下我得到了多少上下文。
2)我想在aspectj上輕鬆替換tx模式(我只知道在ome上下文中工作)。但是當我更換時,我會遇到轉換錯誤。
,我想有普遍的變異兩種類型的交易 這裏我想補充mode="aspectj"
和我有一樣的註釋@Service,@Resourse,對具體類的主要問題
<tx:annotation-driven transaction-manager="transactionManager" mode="aspectj" proxy-target-class="true"/>
一切似乎都應該工作,但我在flush
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is javax.persistence.TransactionRequiredException: no transaction is in progress
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:575)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1239)
at [internal classes]
at org.apache.logging.log4j.core.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:66)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:194)
at [internal classes]
Caused by: javax.persistence.TransactionRequiredException: no transaction is in progress
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:993)
at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
請給下一個異常,幫我uderstand更好
是否有使用XML的特定原因?我發現使用JavaConfig模塊化配置要簡單得多。 – chrylis
@chrylis只是一個習慣,需要快速製作 – Ray
您獲得的上下文取決於所有這些文件如何加載。我沒有看到任何進口其他東西的東西; Spring如何發現所有這些?值得一提的是,我經常將應用程序構建爲多個模塊的Maven項目,並且我包含了適當的@ @ Configuration'類,並且只是從單個入口點(最近的Spring Boot)掃描它們,而是傳統的XML文件第一個也會工作。 – chrylis