How can I in a jsp page get maven project version number?

Question

Hello guys,

I am working on a java web application, managed by maven2. From time to time, we did some changes, and want to do new releases, of course with new version number. In the homepage (jsp), there is text like

<b>version:</b> 2.3.3...

Is it possible, every time I do a new release, I only change the <version/> in pom.xml, and version number in jsp can be automatically filled by this maven ${project.version}?

I tried maven profile, however it doesn't seem to work.

any ideas?

Thank you.

Answer 1

You can use project filtering to process the JSP as it is copied to the target location. If the JSP is specified with ${project.version}, and the containing folder is specified as a filter location the value should be substituted into the JSP as it is packaged.

For example, adding this to your POM enables filtering for src/main/resources:

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

Update: for war packaging, you may need to configure the war plugin to do its filtering. See the Filtering section of the war-plugin's documentation for more details and examples.

Essentially the process is the same, but it is defined below the war plugin, so you'd have something like this:

<plugins>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.0</version>
    <configuration>
      <webResources>
        <resource>
          <directory>src/main/resources</directory>
          <filtering>true</filtering>
        </resource>
      </webResources>
    </configuration>
  </plugin>
</plugins>

Answer 2

It's maybe stupid but I'd use a .properties file like in this example instead of filtering directly the JSP.

Answer 3

I use this plugin,

http://code.google.com/p/maven-substitute-plugin/

You can do something like this in Java,

   public final static String projectVersion = "@PROJECT_VERSION@";

and it's trivial to pass this value to JSP.