Question

I just want to use maven placeholder in my Java class at compile time in order to reduce duplication.

Something like that:

pom.xml

<properties>
  <some.version>1.0</some.version>
</properties>

SomeVersion.java

package some.company;

public class SomeVersion {

    public static String getVersion() {
        return "${some.version}"
    }

}

Answer 1

simply create file app.properties in src/main/resources with content like this

application.version=${project.version}

then enable maven filtering like this

<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>

That’s all – in app code just read properties file

ClassPathResource resource = new ClassPathResource( "app.properties" );
p = new Properties();
InputStream inputStream = null;
try {
    inputStream = resource.getInputStream();
    p.load( inputStream );
} catch ( IOException e ) {
    LOGGER.error( e.getMessage(), e );
} finally {
    Closeables.closeQuietly( inputStream );
}

and provide method like this

public static String projectVersion() {
    return p.getProperty( "application.version" );
}