JnlpDownloadServlet with Weblogic 6.1 - Null Pointer Exception

Hi,
I am using Web Start with Weblogic 6.1 and I keep getting the exception
java.lang.NullPointerException
at java.io.File.<init>(File.java:181)
at com.sun.javaws.servlet.DownloadRequest.<init>(DownloadRequest.java:62)
at com.sun.javaws.servlet.JnlpDownloadServlet.handleRequest(JnlpDownloadServlet.java:94)
at com.sun.javaws.servlet.JnlpDownloadServlet.doGet(JnlpDownloadServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:263)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:200)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:2390)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:1959)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
Web start itself does not even startup !
If I don't use the JnlpDownloadServlet I can get a simple example to work.
The jnlp file I am using is
<?xml version="1.0" encoding="utf-8"?>
<!-- JNLP File for SwingSet2 Demo Application -->
<jnlp
spec="1.0+"
codebase="$$codebase" href="$$name">
<information>
<title>Test Application</title>
<vendor>BD</vendor>
<description>Demo Application</description>
<offline-allowed/>
</information>
<!-- security>
<all-permissions/>
</security-->
<resources>
<j2se version="1.3"/>
<jar href="testWebStart.jar" main="true" download="eager" />
</resources>
<application-desc main-class="testMClient" />
</jnlp>
The web.xml file is;
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<welcome-file-list>
<welcome-file>
index.html
</welcome-file>
</welcome-file-list>
<!-- Used to do mime mapping but it is not needed
since we are now using the JNLP sdervlet ! -->
<servlet>
<servlet-name>JnlpDownloadServlet</servlet-name>
<servlet-class>com.sun.javaws.servlet.JnlpDownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>JnlpDownloadServlet</servlet-name>
<url-pattern>*.jar</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>JnlpDownloadServlet</servlet-name>
<url-pattern>*.jnlp</url-pattern>
</servlet-mapping>
</web-app>
Any help would be greatly appreciated,
Thanks,
Brian

I have exactly the same problem running JBoss 3-Tomcat-4.0.1. After some investigation it seems that the problem is because of dependency on creating File objects using getRealPath()
The problem manifests itself on several places but for instance:
DownloadRequest Constructor:
if(_context != null && !_path.endsWith("/")) {
String s1 = context.getRealPath(path);
File file = new File(s1);
if(file != null && file.exists() && file.isDirectory())
_path += "/";
s1 is null so a nullpointer is thrown. Instead do something like:
if (_context != null && !_path.endsWith("/")) {
String s1 = context.getRealPath(path);
if (s1 != null) {
File file = new File(s1);
if (file.exists() && file.isDirectory())
_path += "/";
But it is harder to fix on other places such as
ResourceCatalog.scanDirectory(String path)
File file = new File(_servletContext.getRealPath(s));
This will faile since getRealPath returns null resulting in a nullpointer exception which will make it impossible to download versioned jars.
The documentation for ServletContext says that getRealPath will return null if the application is packaged in a war file but this is strange since it worked fine for me for running JBoss-2.4.0_Tomcat-3.2.3. Maybe this is new behaviour for the 2.3 servlet spec ( i assume WL 6.1 is also 2.3 compliant)?

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  • Crystal report (crystalReportsViewer) crash with null pointer exception

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    Edited by: duyhai707 on Jul 13, 2011 7:42 PM
    Edited by: duyhai707 on Jul 13, 2011 8:09 PM

    A lot I don't understand in here... actually, I don't understand anything in your post:
    When you call ShowDialog, what exactly are you trying to show?  The code is the decompiled showtabheader method of the viewer. So, are you trying to override the viewer control and reportalbum?  My guess is that the null reference is for the reportalbum's child object which is not the reportalbum object of the viewer.  I don't understand why the code since its all handled internally to the viewer anyhow.
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    http://www.sdn.sap.com/irj/scn/elearn?rid=/library/uuid/a09f7025-0629-2d10-d7ae-df006a51d1a8
    http://www.codeproject.com/Tips/74499/Crystal-Report-in-WPF.aspx
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    Re: CRVS2010 Beta - WPF Viewer, how to hide the GroupTree control?
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    Follow us on Twitter http://twitter.com/SAPCRNetSup
    Got Enhancement ideas? Try the [SAP Idea Place|https://ideas.sap.com/community/products_and_solutions/crystalreports]

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    In ADF if u assign a null value, u will always get the null pointer exception coz of java. Run the app in debug mode and check the values step by step, by the way there is not exception handling in ur code either, Do u know how to debug in Jdev ?
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