JNLPDownload servlet issue when deployed in iPlanet server

Question

Hi all,
I am doing a POC to check how JWS works to launch an applet on a workstation having two different JRE versions (14.2_06 and 1.6.0_01 installed in lower to higher version order)
I deployed the sample application files in iPlanet server 6.0. In the JNLP file, under resources tag, I included a jar file with some version. However JWS is failing to download the file, with an exception (as seen from JNLP servle log file)
JnlpDownloadServlet(4): JnlpResource: JnlpResource[WAR Path: /lib/SampleApplet__V1.1.jar versionId=1.1 name=SampleApplet.jar lastModified=Thu Jan 01 05:30:00 GMT+05:30 1970] returnVersionId=1.1]
JnlpDownloadServlet(3): Resource returned: /lib/SampleApplet__V1.1.jar
Error in processing request
JnlpDownloadServlet(1): Internal error:
java.lang.NullPointerException
     at com.sun.javaws.servlet.DownloadResponse$ResourceFileDownloadResponse.getContentLength(DownloadResponse.java:178)
     at com.sun.javaws.servlet.DownloadResponse$FileDownloadResponse.sendRespond(DownloadResponse.java:117)
     at com.sun.javaws.servlet.JnlpDownloadServlet.handleRequest(JnlpDownloadServlet.java:115)
     at com.sun.javaws.servlet.JnlpDownloadServlet.doGet(JnlpDownloadServlet.java:79)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.server.http.servlet.NSServletRunner.invokeServletService(NSServletRunner.java:919)
     at com.iplanet.server.http.servlet.NSServletRunner.Service(NSServletRunner.java:483)
The same application when deployed in tomcat server 4.1.32 is working fine.
All the jar file is available in the correct location and I have verified it. After some investigation with JNLP servlet source code, I found that iplanet 6.0 is throwing nullpointer excepton due to null return from following line from com.sun.javaws.servlet.JNLPResource.java file.
_resource = context.getResource(path); // here context is ServletContext and path input is relative path.
Has any one come across this problem in iplanet server? Does getResourcePath always return null in iPlanet server?
I don't want to change code in jnlp-servlet.jar, and it's the best case. Your inputs on this are appreciated.
Thanks & Regards,
Sudhakar

Answer 1

Below is our reuirment.
1. We will route the request based on urlprefix, these url prefix can be added and removed at runtime. We want to handle this situation automatically(not by obj conf changes). Also we will chnage the destination of request.
2. We want insert string in the url for our internal purpose.
So we opted for plugin.
BTW: I built the plugin for 32-bit environment.
$ file archMini-90.0.0.1.so
archMini-90.0.0.1.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped
Below is my cc options.
CC_CMD=/usr/bin/gcc -m32 -fpic -DNET_SSL -DLinux -DLINUX -D_REENTRANT
LD_SHAREDCMD=/usr/bin/gcc -m32 -shared