code: @Override
  	public boolean isPrevGoupNotEq(String actualGroup) {
  		if (LOGGER.isTraceEnabled()) LOGGER.trace(String.format("check group prev: %s, act: %s", this.prevGroup, actualGroup));
  		return StringUtils.isEmpty(this.prevGroup) || !actualGroup.equals(this.prevGroup);
  	}
docs: /* (non-Javadoc)
  @see de.chandre.admintool.quartz.AdminToolQuartzService#isPrevGoupNotEq(java.lang.String)