code: public void setActiveTrace(String activeNames,
                                 int traceLevel)
                      throws java.io.IOException {
          TraceFactory.activeNames = activeNames;
          TraceFactory.traceLevel = traceLevel;;
      }
docs: Specify what to trace and start tracing it.
  
  @param activeNames of classes to be activated separated by ":"
  "*" represents any name.
  @param traceLevel to be applied.
  @throws java.io.IOException