SOA Suite - logging in BPEL

I was wondering how to log debug information in a BPEL process,
and here I found an excellent article on using a Java embedded action.... great stuff, Brazilian friend, bem feito!

Just code this into a Java Embedded activity:

Object countLines = getVariableData("countLines");   
  
System.out.println("IN LOOP countLines=" + countLines);

/* writes to the audit trail - will then be visible in BPEL console at runtime*/
addAuditTrailEntry("countLines is: " + countLines);

This article seems to be interesting on how to use log4j from a BPEL process

See also here for more on logging XML in BPEL