You can add the class name to the output Pattern with %C, although the docs warn that this is slow. Is this what you want?
Or since onegetLogger()
method takes a String, you could concatenate the class and your "jbpmLogger" if you wanted to. And since the naming is hierarchical, still just using your single logger in the configuration file. e.g.
Logger logger = getLogger("jbpmLogger." + this.getClass().getName());