code: public void print(char c) throws IOException
      {
          if(this._listener!= null &&  !checkIfCalledFromWLonError()){
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())    
                  Tr.debug(tc, "non blocking print char , WriteListener enabled: " + this._listener);
              this.print_NonBlocking(Character.toString(c));
          }
          else {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())    
                  Tr.debug(tc, "print char");
              super.print(c);
          }    
      }
docs: /*
  @see javax.servlet.ServletOutputStream#print(char)