How do I display the value of a property?
Author: Deron Eriksson
Description: This tutorial describes how to display the value of a property.
Tutorial created using:
Windows Vista || JDK 1.6.0_04 || Eclipse Web Tools Platform 2.0.1 (Eclipse 3.3.1)
With mavenSW, a property can be accessed by the standard ${property_name} format. The maven-antrun-plugin:run goal can be used to run AntSW tasks. We can use the "echo" Ant task to display a value of a property. The following fragment of a pom.xml file creates a property called "testproperty" with the value "This is a test property". The pom.xml fragment binds the antrun:goal to the validate build lifecycle phase. It uses the "echo" Ant task to display the value of the "testproperty" property. Fragment of pom.xml to create and display 'testproperty' property<properties> <testproperty>This is a test property</testproperty> </properties> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-antrun-plugin</artifactId> <version>1.1</version> <executions> <execution> <phase>validate</phase> <goals> <goal>run</goal> </goals> <configuration> <tasks> <echo>Displaying value of 'testproperty' property</echo> <echo>[testproperty] ${testproperty}</echo> </tasks> </configuration> </execution> </executions> </plugin> </plugins> </build> Performing a "mvn validate" on the "mytest" project generates the following console output: Console output of 'mvn validate' on 'mytest' project[INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Building mytest [INFO] task-segment: [validate] [INFO] ------------------------------------------------------------------------ [INFO] [antrun:run {execution: default}] [INFO] Executing tasks [echo] Displaying value of 'testproperty' property [echo] [testproperty] This is a test property [INFO] Executed tasks [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESSFUL [INFO] ------------------------------------------------------------------------ [INFO] Total time: < 1 second [INFO] Finished at: Mon Feb 11 14:29:11 PST 2008 [INFO] Final Memory: 2M/5M [INFO] ------------------------------------------------------------------------ The value of the "testproperty" property is properly displayed. The "mytest" project's full pom.xml file is shown here. pom.xml<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.maventest</groupId> <artifactId>mytest</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>mytest</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <dependency> <groupId>commons-lang</groupId> <artifactId>commons-lang</artifactId> <version>2.3</version> <scope>compile</scope> </dependency> </dependencies> <properties> <testproperty>This is a test property</testproperty> </properties> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-antrun-plugin</artifactId> <version>1.1</version> <executions> <execution> <phase>validate</phase> <goals> <goal>run</goal> </goals> <configuration> <tasks> <echo>Displaying value of 'testproperty' property</echo> <echo>[testproperty] ${testproperty}</echo> </tasks> </configuration> </execution> </executions> </plugin> </plugins> </build> </project> |