CODEWITHSUNDEEP
javaspring
scravy
scravy

Reputation: 12283

Spring 4 Servlet and a configuration file

I have a Spring 4 MVC Servlet, which uses JPA and spring-orm to connect to the database. My applicationContext.xml file contains the following:

<util:map id="persistenceUnitConfiguration">
    <entry key="javax.persistence.logging.level" value="INFO" />
    <entry key="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
    <entry key="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/DATABASE" />
    <entry key="javax.persistence.jdbc.user" value="USERNAME" />
    <entry key="javax.persistence.jdbc.password" value="PASSWORD" />
    <entry key="eclipselink.weaving" value="false" />
</util:map>

<bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"
      id="entityManagerFactory">
    <property name="persistenceUnitName" value="myPersistenceUnit" />
    <property name="jpaVendorAdapter" ref="jpaAdapter" />
    <property name="packagesToScan" value="my.package.entities" />
    <property name="jpaPropertyMap" ref="persistenceUnitConfiguration" />
</bean>

The application is packaged as a WAR. I want to somehow configure the DATABASE, USERNAME, and PASSWORD values, such that I can distribute the WAR and nobody has to touch it. Only thing to do would be to edit a configuration file somewhere.

What is the best approach for doing so?

Can I somehow set the jpaPropertyMap programmatically during boot of my webapp and read it from a configuration file at a fixed location?

Upvotes: 1

Views: 270

Answers (1)

Luiggi Mendoza
Luiggi Mendoza

Reputation: 85779

Create a properties file like database.properties:

db.user=youruser
db.password=yourpassword

Then in your Spring application config file, add

<context:property-placeholder location="classpath:my/package/config/database.properties" />

Now you can access to the properties using expression language syntax:

<bean ...>
    <property name="dbUser" value="${db.user}" />
    <property name="dbPassword" value="${db.password}" />
</bean>

If you're using annotation config, then use

@Component
public class YourBean {
    @Value( "${db.user}" )
    private String dbUser;

    @Value( "${db.password}" )
    private String dbPassword;
}

Applied to your case, it would be (similar for more fields)

<util:map id="persistenceUnitConfiguration">
    <entry key="javax.persistence.logging.level" value="INFO" />
    <entry key="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
    <entry key="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/DATABASE" />
    <entry key="javax.persistence.jdbc.user" value="${db.user}" />
    <entry key="javax.persistence.jdbc.password" value="${db.password}" />
    <entry key="eclipselink.weaving" value="false" />
</util:map>

If your properties file is outside classpath, use file: instead:

<context:property-placeholder location="file:/path/to/your/database.properties" />

Upvotes: 1

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