How to use RequestDispatcher.forward method in a portlet
I have a servlet (HelloServlet2) that acts as the controller. This is a very simplified example. This servlet calls the dispatcher.foward(req, res) method to foward to a JSP page for displaying. At this point I get a FileNotFoundException. The HelloServlet2 is in the standard location WEB-INF/classes/com/a2i/industrial/servlet/HelloServlet2.java.
How come it's looking in Industrial/servlet/HelloServlet2 instead of Industrial/WEB-INF/classes/..? If I access the servlet by http://host:port/Industrial/HelloServlet2, it works fine. I have another portlet (servlet) that doesn't call the forward method and it works fine too. Thanks for your help.
Here is the web.xml:
<servlet>
<servlet-name>HelloServlet2</servlet-name>
<display-name>HelloServlet2</display-name>
<servlet-class>com.a2i.industrial.servlet.HelloServlet2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet2</servlet-name>
<url-pattern>/HelloServlet2/*</url-pattern>
</servlet-mapping>
Here is the calling code from HelloServlet2:
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
RequestDispatcher dispatcher= getServletContext().getRequestDispatcher("/hello.jsp");
dispatcher.forward(req, res);
Here is the portlet definition:
<portlet class="oracle.portal.provider.v2.DefaultPortletDefinition">
<id>2</id>
<name>HelloServlet2</name>
<title>Hello Servlet2</title>
<shortTitle>Hello Servlet2</shortTitle>
<description>This is the "hello world" sample implemented using Java Servlets and the extensible renderer architecture.</description>
<timeout>10000</timeout>
<timeoutMessage>Hello Servlet timed out</timeoutMessage>
<acceptContentType>text/html</acceptContentType>
<renderer class="oracle.portal.provider.v2.render.RenderManager">
<contentType>text/html</contentType>
<autoRedirect>true</autoRedirect>
<showPage>/servlet/HelloServlet2</showPage>
</renderer>
</portlet>
Here is the stack trace:
7/15/03 10:43 AM industrial: JspServlet: unable to dispatch to requested page: java.io.FileNotFoundException: C:\ora9iasp\j2ee\OC4J_Portal\applications\_industrial\industrial\servlet\HelloServlet2 (The system cannot find the path specified)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:64)
at oracle.jsp.provider.JspFilesystemResource.fromStream(JspFilesystemResource.java:153)
at oracle.jsp.provider.JspFilesystemResource.fromReader(JspFilesystemResource.java:169)
at oracle.jsp.runtimev2.JspPageCompiler.fromReader(JspPageCompiler.java:345)
at oracle.jsp.runtimev2.JspPageCompiler.attemptCompilePage(JspPageCompiler.java:250)
at oracle.jsp.runtimev2.JspPageCompiler.compilePage(JspPageCompiler.java:171)
at oracle.jsp.runtimev2.JspPageInfo.compileAndLoad(JspPageInfo.java:338)
at oracle.jsp.runtimev2.JspPageTable.compileAndServe(JspPageTable.java:481)
at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:255)
at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:407)
at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:330)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:269)
at com.evermind.server.http.ServletRequestDispatcher.forward(ServletRequestDispatcher.java:219)
at com.a2i.industrial.servlet.HelloServlet2.doGet(HelloServlet2.java:21)
at com.a2i.industrial.servlet.HelloServlet2.doPost(HelloServlet2.java:14)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:283)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
at com.evermind.server.http.ServletRequestDispatcher.include(ServletRequestDispatcher.java:108)
at oracle.portal.provider.v2.render.http.ResourceRenderer.renderBody(Unknown Source)
at oracle.portal.provider.v2.render.RenderManager.render(Unknown Source)
at oracle.portal.provider.v2.DefaultPortletInstance.render(Unknown Source)
at oracle.webdb.provider.v2.adapter.soapV1.ProviderAdapter.showPortlet(Unknown Source)
at oracle.webdb.provider.v2.adapter.soapV1.ProviderAdapter.handleHttp(Unknown Source)
at java.lang.reflect.Method.invoke(Native Method)
at oracle.webdb.provider.v2.adapter.SOAPServlet.doHTTPCall(Unknown Source)
at oracle.webdb.provider.v2.adapter.SOAPServlet.service(Unknown Source)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:269)
at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:735)
at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:151)
at com.evermind.util.ThreadPoolThread.run(ThreadPoolThread.java:64)
7/15/03 10:43 AM industrial: ERROR: ResourceRenderer.renderBody - Resource "/servlet/HelloServlet2" returned HTTP Status: 404. Error message: OracleJSP:
java.io.FileNotFoundException: C:\ora9iasp\j2ee\OC4J_Portal\applications\_industrial\industrial\servlet\HelloServlet2 (The system cannot find the path specified). Content returned follows....
Thanks for you help David. I changed my code from getServletContext().getRequestDispatcher(jspPage).forward(req, res) to getServletContext().getNamedDispatcher(jspPage).forward(req, res). It worked but I run into the same problem with jsp:include.
I am using the July 2003 of the PDK. I followed the direction for installing version 2 but I did not redeploy with the new jpdk.ear since one was already deployed. After redeploying with the new jpdk.ear, it fixed the jsp:include problem I was having. The problem with using getServletContext().getRequestDispatcher(jspPage).forward(req, res) STILL exist. I am not sure what the deal is.
Oh, I also tried the code below and it doesn't work.
path = req.getContextPath() + jspPage
getServletContext().getRequestDispatcher(path).forward(req, res)
In any case, using getNamedDispatcher() is working fine. I am still curious about getRequestDispatcher() though.
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Error 404
An error has occured while processing request:http://teamsite-cwc-review.indsys.ge.com/cwc/servlet/com.geindsys.gede.globalservices.SCSControllerServlet
Message: [JSP 1.0 Processor] reported an error
i was able to get the same while using response.SendRedirect(url);
Please help..
Thanks in Advance..
Regards,
Ravi.Looks like your JSP is throwing an exception. Check the logs in your server to find the details about it. (Was there an XML question here? I couldn't see one.)
-
Error While using RequestDispatcher.forward --URGENT!!!
Hi All,
I am getting an error while i am forwarding a request from a controller servlet to a JSP in WAS 3.5.
i am using the following code:
String url = "../gede/globalservices/SCSLogin.jsp";
RequestDispatcher rd = getServletConfig().getServletContext().getRequestDispatcher(url);
rd.forward(request, response);
The error i get is :
Error 404
An error has occured while processing request:http://teamsite-cwc-review.indsys.ge.com/cwc/servlet/com.geindsys.gede.globalservices.SCSControllerServlet
Message: [JSP 1.0 Processor] reported an error
i was able to get the same while using response.SendRedirect(url);
Please help..
Thanks in Advance..
Regards,
Ravi.I think the problem is in the ".." part of your url.
If you have a webapp named cwc in the webapps/cwc directory and in this webapp in there is a file SCSLogin.jsp under webapps/cwc/gede/globalservices you should use a URL:
String url = "/gede/globalservices/SCSLogin.jsp"; -
How to use the readLine() method when reading data from a URL?
Hello,
I have a URL which contains text input.
The only way to get the data from this URL is by opening a URL connection to it.
I would like to get the data from this URL but at the same time I would like to be able to use readLine() method of BufferedReader in order to read the data line by line.
My question is how do I combine between these two requirements in order to reed the data from the URL?
RoyHello Roy,
can you try out this code.
URL yahoo = new URL("http://www.yahoo.com/");
URLConnection yc = yahoo.openConnection();
BufferedReader in = new BufferedReader(
new InputStreamReader(
yc.getInputStream()));
String inputLine;
while ((inputLine = in.readLine()) != null)
System.out.println(inputLine);
in.close();
Regards,
Mohan R
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