Is there a way to use maven property in Java class during compilation

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" ); } 

Answer 2

Even though it's not a very nice solution it is possible with the default maven resource plugin.

First you need to specify the resource plugin.

<project>   <build>     <!-- Configure the source files as resources to be filtered       into a custom target directory -->     <resources>       <resource>         <directory>src/main/java</directory>         <filtering>true</filtering>         <targetPath>../filtered-sources/java</targetPath>       </resource>       <resource>         <directory>src/main/resources</directory>         <filtering>true</filtering>       </resource>     </resources>   </build> </project> 

Afterwards you will need to change the 'default' configuration of the compiler plugin.

<project>   <build>       <!-- Overrule the default pom source directory to match             our generated sources so the compiler will pick them up -->       <sourceDirectory>target/filtered-sources/java</sourceDirectory>   </build> </project>