I was recently experimenting with the maven embedder component (Version 2.0.4) to embed Maven into IDEA using the embedder API.
Somehow I called the setLogger(...) method AFTER I called maven.start(). This almost drove me crazy, because I didn't get any output. The trick is, to call the setLogger(...) method before a call to maven.start(), e.g. just like this (as described in the maven docs, see http://maven.apache.org/guides/mini/guide-embedding-m2.html):
MavenEmbedder maven = new MavenEmbedder();
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
maven.setClassLoader( classLoader );
maven.setLogger( new MavenEmbedderConsoleLogger() );
It seems that it is currently (in Version 2.0.4) not possible to set the logger after the embedder was started.
Maybe this is helpful for others.