code: @Override
  	public void release() {
  		super.release();
  		setSrcExpr(null);
  		setUseRandomParamExpr(null);
  		setMediaExpr(null);
  		setTitleExpr(null);
  		setAlternateExpr(null);
  		setDisplayAlternateExpr(null);
  	}
docs: /*
  (non-Javadoc)
  
  @see javax.servlet.jsp.tagext.TagSupport#release()