Al ejecutar la creación de un instalador, ya sea mediante la opción *mvn create installer* o mediante un comando similar a este desde la consola:

::

  mvn -P create-installer install

es habitual encontrarse con un error que termina con líneas como estas:

::

  [artifact:mvn] [INFO] Creating package of the package info:
  [artifact:mvn] [INFO] org.gvsig.installer.lib.impl.DefaultPackageInfo@11e8050 (
  [artifact:mvn] 	code: org.gvsig.oracle
  [artifact:mvn] 	name: 
  [artifact:mvn] 	description: 
  [artifact:mvn] 	gvSIG-version: 
  [artifact:mvn] 	version: 0.0.1-0
  [artifact:mvn] 	buildNumber: 0
  [artifact:mvn] 	operating-system: all
  [artifact:mvn] 	architecture: all
  [artifact:mvn] 	java-version: j1_5
  [artifact:mvn] 	download-url: 
  [artifact:mvn] 	state: devel
  [artifact:mvn] 	official: false
  [artifact:mvn] 	type: unknow
  [artifact:mvn] 	model-version: 1.0.1
  [artifact:mvn] 	owner: 
  [artifact:mvn] 	owner-url: 
  [artifact:mvn] 	sources-url: 
  [artifact:mvn] 	dependencies: 
  [artifact:mvn] 	web-url: 
  [artifact:mvn] 	categories: [])
  [artifact:mvn] [INFO] ------------------------------------------------------------------------
  [artifact:mvn] [ERROR] FATAL ERROR
  [artifact:mvn] [INFO] ------------------------------------------------------------------------
  [artifact:mvn] [INFO] null
  [artifact:mvn] [INFO] ------------------------------------------------------------------------
  [artifact:mvn] [INFO] Trace
  [artifact:mvn] java.lang.NullPointerException
  [artifact:mvn] 	at java.util.Hashtable.put(Hashtable.java:394)
  [artifact:mvn] 	at java.util.Properties.setProperty(Properties.java:143)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.info.InstallerInfoFileWriter.write(InstallerInfoFileWriter.java:101)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.info.InstallerInfoFileWriter.write(InstallerInfoFileWriter.java:74)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.info.InstallerInfoFileWriter.write(InstallerInfoFileWriter.java:59)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.DefaultInstallerProviderServices.writePackageInfoFile(DefaultInstallerProviderServices.java:148)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.DefaultInstallerProviderServices.writePackageInfoForIndex(DefaultInstallerProviderServices.java:136)
  [artifact:mvn] 	at org.gvsig.installer.lib.impl.creation.DefaultMakePluginPackageService.writePackageInfoForIndex(DefaultMakePluginPackageService.java:221)
  [artifact:mvn] 	at org.gvsig.installer.maven.GeneratePluginPackageIndexMojo.createPackage(GeneratePluginPackageIndexMojo.java:83)
  [artifact:mvn] 	at org.gvsig.installer.maven.AbstractGeneratePackageMojo.execute(AbstractGeneratePackageMojo.java:167)
  [artifact:mvn] 	at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLifecycle(DefaultLifecycleExecutor.java:556)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:535)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
  [artifact:mvn] 	at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
  [artifact:mvn] 	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
  [artifact:mvn] 	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
  [artifact:mvn] 	at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
  [artifact:mvn] 	at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
  [artifact:mvn] 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  [artifact:mvn] 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  [artifact:mvn] 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  [artifact:mvn] 	at java.lang.reflect.Method.invoke(Method.java:597)
  [artifact:mvn] 	at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
  [artifact:mvn] 	at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
  [artifact:mvn] 	at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
  [artifact:mvn] 	at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
  [artifact:mvn] [INFO] ------------------------------------------------------------------------
  [artifact:mvn] [INFO] Total time: 11 seconds
  [artifact:mvn] [INFO] Finished at: Fri May 11 15:34:48 CEST 2012
  [artifact:mvn] [INFO] Final Memory: 57M/137M
  [artifact:mvn] [INFO] ------------------------------------------------------------------------

  BUILD FAILED
  C:\dev\ew\gv2\build\ant-tasks\maven-goals.xml:35: The following error occurred while executing this line:
  C:\dev\ew\gv2\build\ant-tasks\ant-tasks-config.xml:117: Java returned: 1

Esto suele ocurrir porque no se ha incluído una referencia al archivo ``package.info`` en ``distribution.xml``. La solución consiste en añadir un párrafo similar a este en dicho archivo:

::

  
    ...
    
    ...
  	
            package.info
            ${extension.install.dir.name}
            
        
    ...
        
    ...