How can I write the complete environment of a maven build into a file for later reference / debugging?

["Heix, Andreas" <an...@sap.com>]

Hi,

we use mvn on both local developer's machines as well as some central CI servers and machines reserved to do the "real" release builds. This means different OS, Nexus instances used as proxy and so on.

When we encounter the "it works on my machine", it takes us some time to spot the differences which might be the cause for this. It seems that the class org.apache.maven.execution.MavenSession contains many of the interesting parameters, but I have not found a way to "dump" its status so we could compare it with another MavenSession instance from another machine.

I did some reverse engineering, which does the job for us, but it is - well, just reverse engineering. Especially the filtering is really depending on the non-API internals of the classes. Is there a nicer solution available from the Maven core?

Thanks and kind regards
Andreas




	public static void dumpMavenSessionAsXML(MavenSession session, OutputStream outputStream, boolean filtered) {
		
		XStream xstream = new XStream(new DomDriver(UTF8_ENCODING));
		if (filtered) {
			xstream.omitField(DefaultPlexusContainer.class, "containerContext");
			xstream.omitField(DefaultPlexusContainer.class, "classWorld");
			xstream.omitField(DefaultPlexusContainer.class, "componentRegistry");
			xstream.omitField(DefaultPlexusContainer.class, "containerRealm");
			xstream.omitField(DefaultPlexusContainer.class, "loggerManager");
			
			xstream.omitField(MavenSession.class, "pluginContextsByProjectAndPluginKey");
			xstream.omitField(MavenSession.class, "result");
			xstream.omitField(MavenProject.class, "mavenProjectBuilder");
			xstream.omitField(MavenProject.class, "repositorySystem");
			xstream.omitField(MavenProject.class, "projectBuilderConfiguration");
			
			xstream.omitField(DefaultMavenExecutionRequest.class, "localRepository");
			xstream.omitField(DefaultMavenExecutionRequest.class, "repositoryCache");
			xstream.omitField(DefaultMavenExecutionRequest.class, "transferListener");
			xstream.omitField(DefaultMavenExecutionRequest.class, "projectBuildingRequest");
			xstream.omitField(DefaultMavenExecutionRequest.class, "executionListener");
		}	
		
		xstream.toXML(session, outputStream);
	}




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Re: How can I write the complete environment of a maven build into a file for later reference / debugging?

[eldad_ak <el...@yahoo.com>]

Hi,
I suggest adding the maven-antrun-plugin and using the <echoporperties> task
and then an <exec> task where you simply call 'set' (on windows) or 'env'
and 'set' (on unix) and redirect the output as needed. It's not so fancy,
but it gets the job done.

Eldad
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