do not use names like 1.jsp, 3.jsp, change them to start with a letter, for examples3.jsp:
<html>
<body>
<jsp:include page="s1.jsp"/>
</body>
</html>
s1.jsp:<html>
<body>
<%="Hello Word"%>
<%! String str1;
%>
<%
str1="Hello Word";
out.println(str1);
%>
</body>
</html>
<html>
<body>
<jsp:include page="s1.jsp"/>
</body>
</html>
s1.jsp:<html>
<body>
<%="Hello Word"%>
<%! String str1;
%>
<%
str1="Hello Word";
out.println(str1);
%>
</body>
</html>
<jsp:include page="1.jsp"/>
???
<html>
<body>
<jsp:include page="1.jsp" fulsh ="true"/>
</body>
</html>fulsh parameter must needed.