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PODifference between configuring data source in persistence.xml and in spring configuration files
 

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  1. PODifference between configuring data source in persistence.xml and in spring configuration files
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    <p>I've seen (and done) data source configuration in two ways (the code below is just for demo): </p> <p>1) configuration inside persistence units, like:</p> <pre><code>&lt;persistence-unit name="LocalDB" transaction-type="RESOURCE_LOCAL"&gt; &lt;class&gt;domain.User&lt;/class&gt; &lt;exclude-unlisted-classes&gt;true&lt;/exclude-unlisted-classes&gt; &lt;properties&gt; &lt;property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver"/&gt; &lt;property name="hibernate.connection.url" value="jdbc:hsqldb:hsql://localhost"/&gt; &lt;property name="hibernate.hbm2ddl.auto" value="create"/&gt; &lt;property name="hibernate.c3p0.min_size" value="5"/&gt; .... &lt;property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect"/&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; </code></pre> <p>2) configuration inside spring configuration files (like applicationContext.xml):</p> <pre><code>&lt;bean id="domainEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="persistenceUnitName" value="JiraManager"/&gt; &lt;property name="dataSource" ref="domainDataSource"/&gt; &lt;property name="jpaVendorAdapter"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"&gt; &lt;property name="generateDdl" value="false"/&gt; &lt;property name="showSql" value="false"/&gt; &lt;property name="databasePlatform" value="${hibernate.dialect}"/&gt; &lt;/bean&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="domainDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"&gt; &lt;property name="driverClass" value="${db.driver}" /&gt; &lt;property name="jdbcUrl" value="${datasource.url}" /&gt; &lt;property name="user" value="${datasource.username}" /&gt; &lt;property name="password" value="${datasource.password}" /&gt; &lt;property name="initialPoolSize" value="5"/&gt; &lt;property name="minPoolSize" value="5"/&gt; ..... &lt;/bean&gt; </code></pre> <p>The question is: are there any pros and cons of each way, or it's just a matter of taste?</p>
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    1. COAfter thinking once more about your question: isn't your *actual* question more "What's the advantage of Spring?", it sounds like as if you don't see it. Ask yourself: Why are you using it?
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    2. CO@BalusC: I don't know the ways these configurations are transformed into `entityManagerFactory` at startup. If the same things are going then the answer to my question whould be `it's a matter of taste`. If something different is going then I want to know the difference.
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    3. COI wouldn't call using Spring "a matter of taste". You use it with a reason: IoC. I actually posted an answer which reads like *"Well, if you're using Spring and/or want IoC (that's Spring's job), then go for Spring, else just "plain" JPA."* but I deleted it after a second thought about your question since the actual problem seems to be deeper than that.
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