Missing nvarchar fields in hsodbc connection

I need read access from an Oracle 10.2.0.4 database (Win 2003 Server) to a MS SQL Server 2005 database using collation: SQL_Latin1_General_CP1_CI_AS. The tables have nvarchar and ntext columns.
The oracle database has the following nsl_database_parameters set:
NLS_NCHAR_CHARACTERSET AL16UTF16
NLS_CHARACTERSET AL32UTF8
NLS_NCHAR_CONV_EXCP FALSE
I've installed the mssql SQL Native Client and set up a System DSN in the ODBC Data Source Administrator.
Since I only need read access, I tried using Oracle heterogeneous services (hsodbc) to connect to mssql. I created an init<odbcname>.ora file with the following HS init parameters:
HS_FDS_CONNECT_INFO = ovsqlserver
HS_FDS_TRACE_LEVEL = OFF
HS_NLS_NCHAR = UTF8
I added the info needed to listener.ora and tnsnames.ora and established a successful connection to the mssql data. Finally, created the needed database link in the Oracle database.
I can query tables on mssql BUT any column defined as nvarchar or ntext do not show up. Oracle clearly states that if there are datatypes it can't translate, it won't include the column.
Now I find that HSODBC has been desupported as of 15Mar09 and that one should use DG4ODBC included with the 11g release. Arrgggg!!!
I installed only the 11.1.0.7 Gateway for ODBC to get the DB4ODBC. Other forum searches state that DB4ODBC only works with an 11.1 listener but I don't have a full install of 11.1 with the requisite libraries.
So. Is there a way to see the nvarchar columns in my admittedly desupported HSODBC configuration? Is it a char set mismatch issue? Are there other tweaks that have to made to get the ODBC driver or HSODBC to recognize the nvarchar and ntext columns?
I've been working on various configurations for a week and still no joy. Surely this has been done many times before. Your help would be deeply appreciated.

Installing DG4ODBC is the correct approach as HSODBC was desupported 15th of March 2008.
As you have already a 10g installation on this machine, please make sure you install the 11g DG4ODBC into its own Oracle_Home. Installing DG4ODBC will automatically install the SQL*Net Server component containing an 11g listener.
So just configure the 11g SQL*Net coming with DG4ODBC and you have everything you need and you can then use DG4ODBC with the 11g listener.
Instructions how to configure DG4ODBC can be found in Metalink note:
Note.466225.1 How to Setup DG4ODBC (Oracle Database Gateway for ODBC) on Windows 32bit

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===================
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========================
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<information>
    <title>Total VU Application</title>
    <vendor>Perimeter Aquisition Corp.</vendor>
    <homepage href="docs/totalvu.html"/>
    <description>TotalVU application from Perimeter</description>
    <description kind="short">The perfect application.</description>
    <offline-allowed/>
     <shortcut online="false">
      <desktop/>
      <menu submenu="Perimeter - TotalVU"/>
    </shortcut>
</information>
   <security>
      <all-permissions/>
</security>
<resources>
     <j2se version="1.5.0+"/>
    <jar href="totalvu.jar" version="1.0+"/>
    <jar href="utilities.jar" version="1.0"/>
    <jar href="common.jar" version="1.0"/>
    <jar href="images.jar" version="1.0"/>
    <jar href="jlfgr-1_0.jar"/>
    <jar href="jboss-j2ee.jar"/>
    <jar href="jnpserver.jar"/>
    <jar href="jboss-common-client.jar"/>
    <jar href="jbossmq.jar"/>
    <jar href="concurrent.jar"/>
    <jar href="swing-worker.jar"/>
    <jar href="log4j.jar"/>
    <extension name="Sun Signed Jars" href="sunsignedjars.jnlp"/>
</resources>
<application-desc main-class="com.perimeter.totalvu.framework.TotalVU"/>
</jnlp>
The other jnlp file (temporary) which contains a version of activation.jar signed by sun looks like this:
<?xml version="1.0" encoding="utf-8"?>
    <jnlp spec="1.0+"
      codebase="$$codebase"
      href="$$name"
      context="$$context">
    <information>
        <title>SunSignedJars</title>
        <vendor>Sun Microsystems, Inc.</vendor>
        <description>Jars signed by Sun Microsystems</description>
    </information>
    <security>
      <all-permissions/>
    </security>
    <resources>
        <jar href="activation.jar"/>
    </resources>
   <component-desc>
   </component-desc>
</jnlp>
My war file (which is in an ear file) has this format:
META-INF\MANIFEST.MF
WEB-INF\lib\jnlp-servlet.jar
WEB-INF\lib\jardiff.jar
WEB-INF\lib\jnlp.jar
version.xml
*.jar
*.jnlp
*.html
This configuration spits out the famous "Missing version field from server....." that I have seen many times in this forum. The download servlet is getting executed because I am getting a log file generated every time. Debug is the only value that will put out a log. The log output looks like this:
JnlpDownloadServlet(3): Request: /totalvu/totalvu.jnlp
JnlpDownloadServlet(3): User-Agent: JNLP/1.5 javaws/1.5.0_06 (b05) J2SE/1.5.0_06
JnlpDownloadServlet(4): DownloadRequest[path=/totalvu.jnlp isPlatformRequest=false]
JnlpDownloadServlet(4): Basic Protocol lookup
JnlpDownloadServlet(4): JnlpResource: JnlpResource[WAR Path: /totalvu.jnlp lastModified=Mon Dec 05 11:17:46 EST 2005]]
JnlpDownloadServlet(3): Resource returned: /totalvu.jnlp
JnlpDownloadServlet(4): SupportQuery in Href: true
JnlpDownloadServlet(4): lastModified: 1133799466000 Mon Dec 05 11:17:46 EST 2005
JnlpDownloadServlet(3): Request: /totalvu/sunsignedjars.jnlp
JnlpDownloadServlet(3): User-Agent: JNLP/1.5 javaws/1.5.0_06 (b05) J2SE/1.5.0_06
JnlpDownloadServlet(4): DownloadRequest[path=/sunsignedjars.jnlp isPlatformRequest=false]
JnlpDownloadServlet(4): Basic Protocol lookup
JnlpDownloadServlet(4): JnlpResource: JnlpResource[WAR Path: /sunsignedjars.jnlp lastModified=Mon Dec 05 10:00:20 EST 2005]]
JnlpDownloadServlet(3): Resource returned: /sunsignedjars.jnlp
JnlpDownloadServlet(4): SupportQuery in Href: true
JnlpDownloadServlet(4): lastModified: 1133794820000 Mon Dec 05 10:00:20 EST 2005If I remove the version= tag from the main jnlp file, everything loads fine, but there is no versioning. I have also tried to remove the version.xml file from the package and change my jar files to use file based versioning, but that didn't work either. I rebuilt my jar files with the __V1.0 extension and the complaint was that it couldn't load the resource totalvu.jar. Well, ya, it is now named totalvu__V1.0.jar! Again, versioning is being ignored. The double underscore and V was not recognized as anything special.
The servlet is running long enough to spit out a log file, no errors. It looks like it succesfully processed the jnlp files, but there is no indication of any versioning.
Doe the jnlp.jar and jardiff.jar files need to be included in the lib folder in the .war file? I am only including the jnlp-servlet.jar. They were not referenced in the example war file in the documentation, but I have seen them referenced in older doc for other app servers. I did try including them, but it made no difference of course. Guess this question is just a housekeeping question.
Does anyone have any insight on this problem?
I am at the point where I think I would like to get the source and debug through it to see what is going on, but that should be unecessary.

Thanks. I had the same problem.
As danrak suggests, just add this to your web.xml file to parse .jar and/or .zip file extensions:
<servlet-mapping>
<servlet-name>JnlpDownloadServlet</servlet-name>
<url-pattern>*.zip</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>JnlpDownloadServlet</servlet-name>
<url-pattern>*.jar</url-pattern>
</servlet-mapping>

JWS1.2 & Missing version field in response

I must say that the guys with JWS1.2 have done well in getting around the proxy issues with the previous versions. However, its disappointing to see this error still occuring when you perform a version based download which is one of the most useful pieces of functionality in JWS (see quote below) . So when a cleint has proxy issues its goodbye 'Bad MIME type error' and hello 'Missing version field in response from server when accessing resource'. Is this really progress? Surely most people use version based downloads?
Will this be fixed for 1.4.1 final and / or does anybody know of a workaround? I've included a previous quote, our jnlp, errors and stack dump below.
Many thanks
Ian
Quote from dietz Jul9, 2002
"The problem is probably that your proxy server is not passing on the correct mime type. Some proxy servers (I'm sorry I don't remember which ones) will only pass on mime types that they are aware of, and will substitute text/html, for others. This should be no problem when using Java Web Start 1.2, since it itself does not require that jnlp files download come with the proper mime type. You may still have a problem using these proxy servers if you are running a servlet implementing the jardiff (incremental update) protocol, since Java Web Start may use the mime type to differenciate between jar files (application/x-java-archive) and jardiff files (application/x-java-archive-diff) "
An error occurred while launching/running the application.
Title: OS MasterMap Viewer
Vendor: Snowflake Software
Category: Download Error
Missing version field in response from server when accessing resource: (http://www.snowflakesoft.co.uk/app/viewer.jar, 1.1)
Stack dump:
JNLPException[category: Download Error : Exception: null : LaunchDesc: null ]      at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)      at com.sun.javaws.cache.DownloadProtocol.getDownloadSize(Unknown Source)      at com.sun.javaws.LaunchDownload.downloadJarFiles(Unknown Source)      at com.sun.javaws.LaunchDownload.downloadEagerorAll(Unknown Source)      at com.sun.javaws.Launcher.downloadResources(Unknown Source)      at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)      at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)      at com.sun.javaws.Launcher.run(Unknown Source)      at java.lang.Thread.run(Unknown Source)
JNLP:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://www.snowflakesoft.co.uk/app/" href="viewer.jnlp">
<information>
<title>OS MasterMap Viewer</title>
     <vendor>Snowflake Software</vendor>
     <description kind="one-line">A Java based map viewer for OS MasterMap</description>
     <description kind="short">A Java based viewer for OS MasterMap capable of reading both Topology and Independent Polygons in either GZip, WinZip or uncompressed GML</description>
     <description kind="tooltip">OS MasterMap Viewer</description>
     <homepage href="http://www.snowflakesoft.co.uk"/>
     <icon width="64" height="64" href="images/SnowflakeLogo64.gif"/>
     <icon width="32" height="32" href="images/SnowflakeLogo32.gif"/>
     <icon kind="splash" href="images/SnowflakeSplash.gif"/>
     <offline-allowed/>
</information>
     <security>
          <all-permissions/>
     </security>
<resources>
     <j2se version="1.3*" href="http://java.sun.com/products/autodl/j2se" initial-heap-size="8m" max-heap-size="1024m"/>
     <j2se version="1.4*" href="http://java.sun.com/products/autodl/j2se" initial-heap-size="8m" max-heap-size="1024m"/>
     <jar href="viewer.jar" version="1.1"/>
</resources>
<application-desc main class="uk.co.snowflakesoft.jme.application.Viewer"/>
</jnlp>

Version based download protocol is not available with vanila web server.
You need to either run some form of script, jsp, or a servlet such as the JNLPDownloadServlet included in the developers pack, to return the requested version, and with the version information.
If you are currently running the servlet you may still be having problem with your proxy having security settings that prohibit sending the additional version information on to the client, although I have never heard of this before.
/Dietz

Missing version field

Hello everyone.
I have problem with version-download protocol. Every time I start up the application using JWS an error ocurred:Missing version field in response from server when accessing resource: (http://localhost:8080/PzP_Test/front01.jar, 1.0)
This is my web.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>
<web-app>
<display-name>PzP_Test</display-name>
<servlet>
    <servlet-name>JnlpDownloadServlet</servlet-name>
    <display-name>JnlpDownloadServlet</display-name>
    <servlet-class>com.sun.javaws.servlet.JnlpDownloadServlet</servlet-class>
    <init-param>
      <param-name>logLevel</param-name>
      <param-value>DEBUG</param-value>
    </init-param>
    <init-param>
      <param-name>logPath</param-name>
      <param-value>/jnlpdownloadservlet.log</param-value>
    </init-param>
</servlet>
<servlet-mapping>
    <servlet-name>JnlpDownloadServlet</servlet-name>
    <url-pattern>/PzP_Test/*</url-pattern>
</servlet-mapping>
<session-config>
    <session-timeout>30</session-timeout>
</session-config>
<mime-mapping>
    <extension>jar</extension>
    <mime-type>application/x-java-archive</mime-type>
</mime-mapping>
<mime-mapping>
    <extension>jnlp</extension>
    <mime-type>application/x-java-jnlp-file</mime-type>
</mime-mapping>
<welcome-file-list>
    <welcome-file>pzpj.jnlp</welcome-file>
</welcome-file-list>
</web-app>This is my jnlp file (the jnlp is creting dynamicly) :
jnlp.jsp
<%
response.setContentType("application/x-java-jnlp-file");
%>
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="http://localhost:8080/PzP_Test/" href="jnlp.jsp">
<information>
    <title>aaaa</title>
    <vendor>dddd/vendor>
    <homepage href="Login.jsp"/>
    <description>some text</description>
</information>
<security>
      <all-permissions/>
</security>
<resources>
    <j2se version="1.4+"/>
    <jar href="front01.jar" main="true" download="eager" version="1.0"/>
    <jar href="front02.jar" main="false" download="eager" version="1.0"/>
    <jar href="front03.jar" main="false" download="eager" version="1.0"/>
    <jar href="front04.jar" main="false" download="eager" version="1.0"/>
</resources>
<application-desc main-class="pl.dd.aa.DDD"/>
</jnlp>This is my version.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<jnlp-versions>
      <resource>
         <pattern>
           <name>front01.jar</name>
            <version-id>1.0</version-id>
         </pattern>
         <file>front01.jar</file>
      </resource>
      <resource>
         <pattern>
           <name>front02.jar</name>
            <version-id>1.0</version-id>
         </pattern>
         <file>front02.jar</file>
      </resource>
      <resource>
         <pattern>
           <name>front03.jar</name>
            <version-id>1.0</version-id>
         </pattern>
         <file>front03.jar</file>
      </resource>
      <resource>
         <pattern>
           <name>front04.jar</name>
            <version-id>1.0</version-id>
         </pattern>
         <file>front04.jar</file>
      </resource>
   </jnlp-versions>And the PzP_Test.war file looks like this:
/PzP_Test/front01.jar
/PzP_Test/front02.jar
/PzP_Test/front03.jar
/PzP_Test/front04.jar
/PzP_Test/jnlp.jsp
/PzP_Test/version.xml
/PzP_Test/WEB-INF/web.xml
/PzP_Test/WEB-INF/lib/jnlp-servlet.jar
Any ideas!?

Ok I resolved it by myself. I have problems with mapping in web.xml file.
But now I have another problem. My jnlp file is created dynamicly. Jsp page create it. When I lunch my app using test.jnlp everything is working fine but when I want to start app with test.jsp then webstart doesn't start and the message occures "Save file as"
Has someon got any idea on this?

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