Persistence.xml field values from properties file
hibernate, java, jpa, persistence.xml, properties
Solution
If you are using maven, you can use source filtering for this. Use this docs for reference. I will outline the process a bit.
You will need to specify the filtering path. I am not sure if you have to explicitly define the included files.
<build>
...
<resources>
<resource>
<directory>src/main/resources/META-INF</directory>
<filtering>true</filtering>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
...
</resources>
...
</build>
The directory you define is relative to the `pom.xml`.
You can now define regular maven properties to replace the placeholders in your `persistence.xml`
If you want to have the properties in a separate .properties file, you need to tell maven, where to find that file:
<filters>
<filter>db.properties</filter>
</filters>
Filtering occurs on `mvn resources:resources`. This step is defined for all the packaging goals you will execute on deployment.
You can use maven profiles to switch between sets of properties or .properties files.
Problem
Help, i would like to my persistence xml properties value reference to my db.properties file. here's my db.properties file ``` jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/apsas jdbc.username=root jdbc.password=password ``` and here's my current persistence.xml ``` <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="apsaspu" transaction-type="RESOURCE_LOCAL"> <provider> org.hibernate.ejb.HibernatePersistence </provider> <properties> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/apsas" /> <property name="hibernate.connection.username" value="root" /> <property name="hibernate.connection.password" value="password" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.hbm2ddl.auto" value="update" /> </properties> </persistence-unit> </persistence> ``` what i wanted to do is to set its property into like this ``` <?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" version="2.0"> <persistence-unit name="apsaspu" transaction-type="RESOURCE_LOCAL"> <provider> org.hibernate.ejb.HibernatePersistence </provider> <properties> <property name="hibernate.connection.driver_class" value="${jdbc.driver}" /> <property name="hibernate.connection.url" value="${jdbc.url}" /> <property name="hibernate.connection.username" value="${jdbc.username}" /> <property name="hibernate.connection.password" value="${jdbc.password}" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.hbm2ddl.auto" value="update" /> </properties> </persistence-unit> </persistence> ``` question is how can i import the properties file into my persistence xml Advance thanks for those who will help me...