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Sample-springds-hibernate » History » Version 9

Henning Blohm, 18.09.2018 21:44

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h1. A sample using Spring data sources and Spring transaction management in a modular application
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This sample is very similar to [[Sample-spring-hibernate]] but differs in that we use
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* Spring configured data sources
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* A Spring transaction manager (in contrast to Atomikos as in [[Sample-jta-spring]] or the built-in TM as in [[Sample-spring-hibernate]]).
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This is another practical application of [[How to Spring]].
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This sample is stored in "z2-samples.springds-hibernate":http://redmine.z2-environment.net/projects/z2-samples/repository/z2-samples-springds-hibernate.
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h2. Prerequisites
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{{include(Java Version Requirements)}}
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You need to run Java DB as network server on localhost. This is explained next.
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The application will create a database "z2-samples"
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{{include(How to run Java db)}}
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h2. Run it
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If you have the database, the fastest way to verify whether it runs is:
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{{include(Install_sample_prefix)}}
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Check out the sample
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<pre><code class="ruby">
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git clone -b v2.6 http://git.z2-environment.net/z2-samples.springds-hibernate
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</code></pre>
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{{include(Install_sample_postfix)}}
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When running, go to http://localhost:8080/springds-hibernate. You should see this:
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!{width:953px}springds-hibernate.png!
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h2. Details
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Similar to [[Sample-spring-hibernate]], the assumption of this example is that of a re-use domain module *com.zfabrik.samples.springds-hibernate.domain* that implements a "Thingy Repository" and is used from a web application that is in another module *com.zfabrik.samples.springds-hibernate.web*. 
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The domain module declares the date source used as well as the transaction manager. The transaction manager is exposed as Z2 component.
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The body of the application context ("here":https://redmine.z2-environment.net/projects/z2-samples/repository/z2-samples-springds-hibernate/revisions/master/entry/com.zfabrik.samples.springds-hibernate.domain/java/src.impl/META-INF/applicationContext.xml) of the domain module looks like this:
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<pre><code class="xml">
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	<!-- annotation based config -->
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	<context:component-scan base-package="com.zfabrik.samples.spring_hibernate" />
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	<context:annotation-config />
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	<!-- DB config (no pooling here - but can be changed easily) -->
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	<!--  Do not use DriverManagerDataSource here for class loading considerations -->
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	<bean id="dataSource" class="org.apache.derby.jdbc.ClientDataSource">
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		<property name="databaseName" value="z2-samples"/>
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		<property name="serverName" value="localhost"/>
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		<property name="portNumber" value="1527"/>
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		<property name="createDatabase" value="create"/>
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	</bean>
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	<!-- The actual EMF we use -->
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	<bean id="entityManagerFactory"	class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
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		<property name="dataSource" ref="dataSource" />
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		<property name="persistenceUnitName" value="thingies" />
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		<property name="jpaVendorAdapter">
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			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
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				<property name="showSql" value="true" />
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				<property name="generateDdl" value="true" />
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				<property name="databasePlatform" value="org.hibernate.dialect.DerbyDialect" />
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			</bean>
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		</property>
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	</bean>
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	<!--  the transaction manager -->
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	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
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	   <property name="entityManagerFactory" ref="entityManagerFactory" />
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	</bean>
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	<!-- EntityManager injection -->
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	<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
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</code></pre>
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The persistence unit "thingies", defined in the same module (as in "java/src.impl/META-INF/applicationContext.xml":https://redmine.z2-environment.net/projects/z2-samples/repository/z2-samples-springds-hibernate/revisions/master/entry/com.zfabrik.samples.springds-hibernate.domain/java/src.impl/META-INF/persistence.xml), is essentially empty must be thought as completed by the application context declaration above (which is a Spring feature).
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The domain module exposes the Thingy Repository as a Z2 component - from a Spring application context defined bean -  that is imported into the application context of the Web application and injected into the "controller filter":https://redmine.z2-environment.net/projects/z2-environment/wiki/Sample-springds-hibernate/edit by Spring. 
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The controller filter uses declarative transaction demarcation relying on the transaction manager exposed by the domain module (note the "transactionManager" bean declaration below).
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Here is the body of the Web apps application context (as declared in "WEB-INF/applicationContext.xml":https://redmine.z2-environment.net/projects/z2-samples/repository/z2-samples-springds-hibernate/revisions/master/entry/com.zfabrik.samples.springds-hibernate.web/web/WebContent/WEB-INF/applicationContext.xml)
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<pre><code class="xml">
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	<!-- Annotation Support -->
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	<context:component-scan base-package="com.zfabrik.samples.spring_hibernate" />
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	<context:spring-configured />
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	<context:annotation-config />		
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	<!-- import transaction manager from domain.   -->
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    <bean id="transactionManager" class="com.zfabrik.springframework.ComponentFactoryBean">
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        <property name="componentName"  value="com.zfabrik.samples.springds-hibernate.domain/transactionManager" />
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        <property name="className"  value="org.springframework.transaction.support.AbstractPlatformTransactionManager" />
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    </bean>
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	<!-- make sure we can use @Transactional with the Spring aspect -->
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	<tx:annotation-driven transaction-manager="transactionManager" mode="aspectj"/>
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	<!-- import external services -->
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    <bean id="thingyRepository" class="com.zfabrik.springframework.ComponentFactoryBean">
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        <property name="componentName"  value="com.zfabrik.samples.springds-hibernate.domain/repository" />
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        <property name="className"  value="com.zfabrik.samples.spring_hibernate.thingies.ThingyRepository" />
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    </bean>
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</code></pre>