Chapter 45. JPA Maven Environment

src
|-- main
|   |-- java
|   |   `-- ejava
|   |       `-- examples
|   |           `-- daoex
|   |               |-- bo
|   |               |   `-- Author.java
|   |               |-- dao
|   |               |   |-- AuthorDAO.java
|   |               |   `-- DAOException.java
|   |               `-- jpa
|   |                   `-- JPAAuthorDAO.java
|   `-- resources
|       `-- META-INF
|           |-- orm.xml
|           `-- persistence.xml (could be placed in src/test branch)
`-- test
    |-- java
    |   `-- ejava
    |       `-- examples
    |           `-- daoex
    |               `-- jpa
    |                   |-- JPAAuthorDAOTest.java
    |                   |-- JPACRUDTest.java
    |                   |-- JPAExtendedOnlyTest.java
    |                   |-- JPAMembershipTest.java
    |                   |-- JPASyncTest.java
    |                   `-- JPATestBase.java
    `-- resources
        |-- hibernate.properties (optional)
        `-- log4j.xml

45.1. JPA Maven Dependencies

45.1.1. JPA API classes


<dependency>

    <groupId>javax.persistence</groupId>

    <artifactId>javax.persistence-api</artifactId>

    <version>2.2</version>

    <scope>provided</scope>

</dependency>

45.1.2. JPA Provider classes


<dependency>

    <groupId>org.hibernate</groupId>

    <artifactId>hibernate-core</artifactId>

    <version>5.3.1.Final</version>

    <scope>test</scope>

</dependency>

45.1.3. Database


<dependency>

    <groupId>com.h2database</groupId>

    <artifactId>h2</artifactId>

    <version>1.4.197</version>

    <scope>test</scope>

</dependency>

45.2. Supplying Runtime Properties

45.2.1. Turn on Resource Filtering in pom.xml


<build>

    <resources>

        <resource>

            <directory>src/main/resources</directory>

            <filtering>true</filtering>

        </resource>

    </resources>

    <testResources>

        <testResource>

            <directory>src/test/resources</directory>

            <filtering>true</filtering>

        </testResource>

    </testResources>

    ...

</build>

Above will depend on whether you use src/main or src/test for resource file(s)

45.2.2. Use ${variable} References in Resource Files




<properties>

    <!-- standard properties -->

    <property name="javax.persistence.jdbc.url" value="${jdbc.url}"/>

    <property name="javax.persistence.jdbc.driver" value="${jdbc.driver}"/>

    <property name="javax.persistence.jdbc.user" value="${jdbc.user}"/>

    <property name="javax.persistence.jdbc.password" value="${jdbc.password}"/>



    <!-- hibernate-specific properties -->

    <property name="hibernate.dialect" value="${hibernate.dialect}"/>

...

</properties>

45.2.3. Define Property Values in Parent pom.xml




<properties>

      <jdbc.driver>org.h2.Driver</jdbc.driver>

      <jdbc.url>jdbc:h2:${basedir}/target/h2db/ejava</jdbc.url>

      <jdbc.user>sa</jdbc.user>

      <jdbc.password/>

      <hibernate.dialect>

          org.hibernate.dialect.H2Dialect

      </hibernate.dialect>

</properties>

45.2.4. Run with Filtered Values




<properties>

    <!-- standard properties -->

    <property name="javax.persistence.jdbc.url" value="jdbc:h2:/home/jcstaff/proj/ejava-javaee/git/jpaDAO/target/h2db/ejava"/>

    <property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>

    <property name="javax.persistence.jdbc.user" value="sa"/>

    <property name="javax.persistence.jdbc.password" value=""/>



    <!-- hibernate-specific properties -->

    <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>

...

</properties>