I am getting below error whenever I try to submit a form using JSP. I want to update a value in hashtable based on inputs from a form(in ChangePassword.html) and print some output using a JSP(ChangePasswordJSP.jsp) page and then pass the request and response to another JSP page.
java.lang.IllegalStateException: getOutputStream() has already been called for this response
I need to do it with JSP(without using servlet) I am using Netbeans as IDE and Glassfish-5 as a server.
ChangePassword.html
<html>
<!-- Form to change the password, takes in User Id and current password. -->
<head>
<title>Change Password </title>
</head>
<body bgcolor="#FDF5E6">
<h3> Change Password </h3>
<form name="myForm" action="ChangePasswordJSP.jsp" method="post">
<label>User Name: </label>
<input type="text" id="uName" name="uName" required/>
<br>
<br>
<label>Old Password: </label>
<input type="password" id="oldPass" name="oldPass" required/>
<br>
<br>
<label>New Password: </label>
<input type="password" id="newPass" name="newPass" required/>
<br>
<br>
<label>Confirm New Password: </label>
<input type="password" id="confirmNewPass" name="confirmNewPass" required/>
<br>
<br>
<br>
<button type="submit" value="Submit" >Submit</button>
<button type="reset" value="Reset">Reset</button>
</form>
</body>
</html>
ChangePasswordJSP.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.util.Hashtable"%>
<%@page import="javax.servlet.http.HttpSession"%>
<%--<%@ page trimDirectiveWhitespaces="true" %>--%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<%! Hashtable users = new Hashtable(); %>
<%!
public void init() {
users.put("ann", "aaa");
users.put("john", "jjj");
users.put("mark", "mmm");
}
%>
<%
session = request.getSession();
if (session.getAttribute("users") == null) {
session.setAttribute("users", users);
}
String userName = request.getParameter("uName");
String oldPassword = request.getParameter("oldPass");
String newPassword = request.getParameter("newPass");
String confirmNewPassword = request.getParameter("confirmNewPass");
if (users != null && newPassword.equals(confirmNewPassword) && users.get(userName).equals(oldPassword)) {
out.println("<h3>Password Changed Successfully. </h3>");
users.put(userName, newPassword);
request.getSession().setAttribute("users", users);
// request.getRequestDispatcher("/LoginServlet").forward(request, response);
} else {
//Password unsuccessful.
out.println("<h3>Password Unsuccessful</h3>");
}
out.println("</body>");
out.println("</html>");
request.getRequestDispatcher("/index.html").include(request, response);
%>
</body>
</html>
Glass Fish Server Log
Warning: StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
at org.apache.catalina.connector.Response.getWriter(Response.java:695)
at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:180)
at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:195)
at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:188)
at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:240)
at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:185)
at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:137)
at org.apache.jsp.ChangePasswordJSP_jsp._jspService(ChangePasswordJSP_jsp.java:118)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1540)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:217)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:119)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:611)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:550)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:114)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:332)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:199)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
at java.lang.Thread.run(Thread.java:748)
Do the following:
response.getOutputStream() instead of default print writer available named out.request.getRequestDispatcher("/index.html").include(request, response); The code with modifications for ChangePasswordJSP.jsp:
<%
session = request.getSession();
ServletOutputStream ot = response.getOutputStream();
if (session.getAttribute("users") == null) {
session.setAttribute("users", users);
}
String userName = request.getParameter("uName");
String oldPassword = request.getParameter("oldPass");
String newPassword = request.getParameter("newPass");
String confirmNewPassword = request.getParameter("confirmNewPass");
if (users != null && newPassword.equals(confirmNewPassword) && users.get(userName).equals(oldPassword)) {
ot.println("<h3>Password Changed Successfully. </h3>");
users.put(userName, newPassword);
request.getSession().setAttribute("users", users);
// request.getRequestDispatcher("/LoginServlet").forward(request, response);
} else {
//Password unsuccessful.
ot.println("<h3>Password Unsuccessful</h3>");
}
ot.println("</body>");
ot.println("</html>");
request.getRequestDispatcher("/index.html").include(request, response);
ot.close();
%>