How can I read external property files in Maven?

Reading External Properties Files in Maven

The need to read external properties files is common in many Maven projects. Specifically, it becomes a necessity when you need to store configuration settings or other sensitive information outside of your codebase.

External Properties in Maven's pom.xml

Although Maven currently lacks a built-in mechanism to directly read external properties files, there are ways to achieve this functionality. One option is to use resource filtering. However, this method can be limited and impractical for certain scenarios.

Properties Maven Plugin

The Properties Maven Plugin provides a solution to this challenge. It allows you to easily read external properties files and define them as Maven properties within your pom.xml using the following syntax:

<code class="xml"><plugin>
  <groupid>org.apache.maven.plugins</groupid>
  <artifactid>maven-properties-plugin</artifactid>
  <version>1.0.0</version>
  <executions>
    <execution>
      <id>read-properties</id>
      <goals>
        <goal>read-properties</goal>
      </goals>
      <configuration>
        <files>
          <file>x.properties</file>
        </files>
      </configuration>
    </execution>
  </executions>
</plugin></code>

By using this plugin, you can define external properties within your pom.xml, making them accessible within your project. This solution eliminates the disadvantages of resource filtering and provides a more convenient and flexible approach for managing external properties in Maven.

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