how to get property value from pom.xml?

Question

I have added a node in my pom.xml:

<properties>
        <getdownload-webapp.version>1.5</getdownload-webapp.version>
</properties>

how could I get this 1.5 value in code?

String version = System.getProperty("getdownload-webapp.version"); // output version = null

This code gave me null while running(

ps: there is no settings.xml in this project

Answer 1

So you have a property like this.

<properties>
    <getdownload-webapp.version>1.5</getdownload-webapp.version>
</properties>

---

Create a file as follows in your Maven project.

  src/main/resources/project.properties

Or as follows if it is for tests only.

  src/test/resources/project.properties

Add this line inside the new file. Please note that you should not prefix with "properties" (e.g. don't write "properties.getdownload-webapp.version").

  version=${getdownload-webapp.version}

---

Note that you can also add flags like this to the file.

  debug=false

---

If not already done, you have to enable Maven filtering for your project. It is the feature that will look for placeholders inside the files of your project to be replaced by values from the pom. In order to proceed, you need add these lines inside the <build> tag of your pom.xml file. This is how to do with src/main:

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

And here is how to do for src/test:

<build>
    <testResources>
        <testResource>
            <directory>src/test/resources</directory>
            <filtering>true</filtering>
        </testResource>
    </testResources>
    ...

---

Finally, in your source code (MyClassName.java), add a block like

  Properties props = new Properties();
  props.load(MyClassName.class.getClassLoader().getResourceAsStream("project.properties"));
  String version = props.getProperty("version");

You can add as many variables as you want to the project.properties file and load each one using this method.