java - Variables in POM dependencies. How maven knows artifact id of SWT? -


the dependencies of piccolo2d-swt described here as

group: ${swt.groupid} artifact: ${swt.artifactid} version: [3.3.0-v3346,) 

how can resolved? take values of variables?

if run empty project dependency, displays error message, mentions org.eclipse.swt.win32.

where did took value?

if printout value of these variables, nothing.

the pom here

<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/xsd/maven-4.0.0.xsd">     <modelversion>4.0.0</modelversion>     <groupid>test_displaymavenvariables</groupid>     <artifactid>test_displaymavenvariables</artifactid>     <version>0.0.1-snapshot</version>       <properties>         <testproperty>this test property</testproperty>     </properties>       <!--         <dependencies>          <dependency>             <groupid>org.piccolo2d</groupid>             <artifactid>piccolo2d-swt</artifactid>             <version>1.3.1</version>         </dependency>       </dependencies>      -->      <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 properties</echo>                                 <echo>[testproperty] ${testproperty}</echo>                                 <echo>[swt.artifactid] ${swt.artifactid}</echo>                                 <echo>[swt.groupid] ${swt.groupid}</echo>                             </tasks>                         </configuration>                     </execution>                 </executions>             </plugin>         </plugins>           <pluginmanagement>             <plugins>                 <!--this plugin's configuration used store eclipse m2e settings only. has no influence on maven build itself.-->                 <plugin>                     <groupid>org.eclipse.m2e</groupid>                     <artifactid>lifecycle-mapping</artifactid>                     <version>1.0.0</version>                     <configuration>                         <lifecyclemappingmetadata>                             <pluginexecutions>                                 <pluginexecution>                                     <pluginexecutionfilter>                                         <groupid>org.apache.maven.plugins</groupid>                                         <artifactid>maven-antrun-plugin</artifactid>                                         <versionrange>[1.1,)</versionrange>                                         <goals>                                             <goal>run</goal>                                         </goals>                                     </pluginexecutionfilter>                                     <action>                                         <ignore></ignore>                                     </action>                                 </pluginexecution>                             </pluginexecutions>                         </lifecyclemappingmetadata>                     </configuration>                 </plugin>             </plugins>         </pluginmanagement>     </build>  </project> 

the swt.groupid , swt.artifactid variables being defined via maven profiles in piccolo2d-swt pom file, example:

<profile>   <id>windows_x86</id>   <activation>     <os>       <family>windows</family>       <arch>x86</arch>     </os>   </activation>   <properties>     <swt.groupid>org.eclipse.swt.win32.win32</swt.groupid>     <swt.artifactid>x86</swt.artifactid>   </properties> </profile> 

a profile being defined each platform , profile activated based on os.family , os.arch detected when run maven.


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