Answer / balumahendran.m(pavartha chenn

public class Pract {

public static void main(String args[]){

System.out.println(reverse("nnnnn ooooooooooooo nnnnnnnnnnnn mmmmmmmmmmmmm"));
}

public static String reverse(String str) {
if ((str == null) || (str.length() <= 1)) {
return str;
}
return reverse(str.substring(1)) + str.charAt(0);
}

}

Answer / bokhtiar mehedy farsim

public class StringReverse {

public String reverse(String str) {
if ((str == null) || (str.length() <= 1)) {
return str;
}
return reverse(str.substring(1)) +
str.charAt(0);
}

public static void main(String args[]){
StringReverse ob=new StringReverse();
System.out.println(ob.reverse("Hello"));
}
}

exception org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.servlet.JspServletWrapper.handleJs pException(JspServletWrapper.java:491) org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:419) org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServ let.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.j ava:717) root cause java.lang.NullPointerException org.apache.struts.taglib.TagUtils.retrieveMessageRes ources(TagUtils.java:1175) org.apache.struts.taglib.TagUtils.message(TagUtils.j ava:1038) org.apache.struts.taglib.bean.MessageTag.doStartTag( MessageTag.java:224) org.apache.jsp.register_jsp._jspx_meth_bean_005fmess age_005f0(register_jsp.java:138) org.apache.jsp.register_jsp._jspService(register_jsp .java:94) org.apache.jasper.runtime.HttpJspBase.service(HttpJs pBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.j ava:717) org.apache.jasper.servlet.JspServletWrapper.service( JspServletWrapper.java:377) org.apache.jasper.servlet.JspServlet.serviceJspFile( JspServlet.java:313) org.apache.jasper.servlet.JspServlet.service(JspServ let.java:260) javax.servlet.http.HttpServlet.service(HttpServlet.j ava:717)

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