java - Sessions showing null error -

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i have jsp page, xyz.jsp in i've set session

request.getsession().setattribute("path", loc);

and in a.java i've used session , sent response jsp page,

string fpath = request.getsession().getattribute("path").tostring();

but, when use same session value in b.java getting null pointer exception.

my.jsp->on button click->a.java->get session1->send response my.jsp->my.jsp reloads->b.java trying use session1->nullpointerexceptionerror

i've tried,

  1. using different session variables

    session.setattribute("session1", loc); session.setattribute("session2", loc);

  2. creating new session variable in a.java , access same in b.java

still same error.

my.jsp looks like,

string loc = "/u/poolla/workspace/firstservlet/webcontent/web-inf/" + ip +"/" +timestamp; session.setattribute("path", loc);

a.java looks like

protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception  {      httpsession session = request.getsession();     string fpath = session.getattribute("path").tostring();       if(!new file(fpath).exists())     {         file uploadedfile = new file(fpath, filename);                     item.write(uploadedfile);         two_file = "right file " +filename;             request.setattribute("file2", two_file);         string f2 = "<span class='blue'>" +"uploaded file " +filename+ " @ " +uploadedfile.getabsolutepath()+ "<br>" + "</span>";                     request.setattribute("f2stat", f2);     }  requestdispatcher rd = request.getrequestdispatcher("geco.jsp"); rd.forward(request, response);

b.java looks like

public void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception  {     httpsession session = request.getsession();     string b = session.getattribute("path").tostring();             file file = new file(b);             if(!file.exists())             {                 file.createnewfile();             }             filewriter fw = new filewriter(file.getabsolutefile());             bufferedwriter bw = new bufferedwriter(fw);             bw.write("hi");             bw.close(); }

this problem. mean using scriptlets in jsp, naming conventions, using 2 servlets in scenario not recommended..

code snippets

web.xml

<servlet>     <servlet-name>myservleta</servlet-name>     <servlet-class>com.examples.example.myservleta</servlet-class>     <load-on-startup>1</load-on-startup> </servlet>  <servlet>     <servlet-name>myservletb</servlet-name>     <servlet-class>com.examples.example.myservletb</servlet-class>     <load-on-startup>1</load-on-startup> </servlet>  <servlet-mapping>     <servlet-name>myservleta</servlet-name>     <url-pattern>*.do</url-pattern> </servlet-mapping>  <servlet-mapping>     <servlet-name>myservletb</servlet-name>     <url-pattern>*.go</url-pattern> </servlet-mapping>  <welcome-file-list>     <welcome-file>index.jsp</welcome-file> </welcome-file-list>

index.jsp

<body>     <%         session.setattribute("location", "tvm");     %>     <form action="gotoajava.do" method="post">         <input type="submit" />     </form> </body>

page2.jsp

<body>     <form action="gotobjava.go" method="get">         <input type="submit" />     </form> </body>

myservleta.java

protected void dopost(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception {          string loc = request.getsession().getattribute("location").tostring();         system.out.println("location in servleta session " + loc);          requestdispatcher rd = request.getrequestdispatcher("geco.jsp");         rd.forward(request, response);     }

myservletb.java

protected void doget(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception {         httpsession session = request.getsession();         string loc = session.getattribute("location").tostring();         system.out.println("location in servletb session " + loc);      }

console log:

mar 20, 2014 9:28:33 org.apache.catalina.startup.catalina start info: server startup in 343 ms location in servleta session tvm location in servletb session tvm

edit: jsp performs 'gotobjava.go' action renamed page2.jsp per op's edit request


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