JspWriter類型中的print（boolean）方法不適用於參數

我想打印從函數返回的字符串值。JspWriter類型中的print（boolean）方法不適用於參數

但我得到的錯誤，即使是這個簡單的過程。

錯誤：

org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 16 in the jsp file: /beansal.jsp 
The method print(boolean) in the type JspWriter is not applicable for the arguments (void) 
13: </head> 
14: <body> 
15: <%String s = new DBConnectionTest().Test();%> 
16: <%=System.out.println(s)%> 
17: <jsp:getProperty name="person" property="name"></jsp:getProperty>&nbsp; 
18: <jsp:getProperty name="person" property="lastName"></jsp:getProperty> 
19: </body>

來源

2016-05-03 Rıza Soylu - Max Joffrey