How to use native dlls in jws

Question

hi,all
I need to use native dll to read registry,I know nativelib label,but after I put the dlls to a jar,and use label <nativelib> to quote the jar,the system tell me error following:
JNLPException[category: Security error : Exception: null : LaunchDesc: null ]
     at com.sun.javaws.LaunchDownload.checkJNLPSecurity(Unknown Source)
     at com.sun.javaws.Launcher.downloadResources(Unknown Source)
     at com.sun.javaws.Launcher.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
when I use jar href="..."to use this jar(This jar is packed dll files),the system tell me
com.sun.deploy.net.FailedDownloadException: Unable to load resourcesFfile:/H:/test/dist/lib/ICE_JNIRegistry.jar
     at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResource(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.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
and
java.util.zip.ZipException: ZIP file must have at least one entry
     at java.util.zip.ZipOutputStream.finish(Unknown Source)
     at java.util.zip.DeflaterOutputStream.close(Unknown Source)
     at java.util.zip.ZipOutputStream.close(Unknown Source)
     at com.sun.deploy.net.HttpDownloadHelper.download(Unknown Source)
     at com.sun.deploy.cache.Cache.downloadResourceToTempFile(Unknown Source)
     at com.sun.deploy.cache.Cache.downloadResourceToCache(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(Unknown Source)
     at com.sun.deploy.net.DownloadEngine.getResource(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.prepareLaunchFile(Unknown Source)
     at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
     at com.sun.javaws.Launcher.launch(Unknown Source)
     at com.sun.javaws.Main.launchApp(Unknown Source)
     at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
     at com.sun.javaws.Main$1.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
now I'm not sure how to zip the dlls so that it can be used in nativelib?and how to used the <nativelib> label? just add it in the jnlp file ok?
Thanks.

Answer 1

>
Thanks,Andrew!>Your detailed and technically specific reply is all the thanks I need ( and probably more than I deserve ;).
I am still mulling (thinking) over your reply, there is nothing that 'jumps out at me' as being wrong with the way it is done, it all is looking like it 'should' work. The only other thing I can think to check is "did JaNeLA report any problems with it?"
Oh hang on, wait just a second..
If this webstart app. uses a native lib, it must declare security 'all-permissions'. See below for a 'hand written' variation to your posted JNLP file. Please make sure you validate these edits, since I did not (and I'm a little drunk, at this moment!).
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<jnlp codebase="file:/H:/test/dist/" href="launch.jnlp" spec="1.0+">
    <information>
        <title>Basic Application Example</title>
        <vendor>Sun Microsystems Inc.</vendor>
        <homepage href="http://appframework.dev.java.net"/>
        <description>A simple java desktop application based on Swing Application Framework</description>
        <description kind="short">Basic Application Example</description>
    <offline-allowed/>
</information>
<security>
  <all-permissions />
</security>
    <resources>
<j2se version="1.5+"/>
<jar eager="true" href="test.jar" main="true"/>
    <jar href="lib/appframework-1.0.3.jar"/>
<jar href="lib/swing-worker-1.1.jar"/>
<jar href="lib/registry.jar"/>
<jar href="lib/swing-layout-1.0.3.jar"/>
<nativelib href="lib/ICE_JNIRegistry.jar"/>
</resources>
    <application-desc main-class="test.TestApp">
    </application-desc>
</jnlp>Oh yeah, yeah. And if you could note for future posts..
When posting code, code snippets, HTML/XML(/JNLP) or input/output, please use the code tags. To do that, select the code, then click the CODE button seen on the Plain Text tab of the message posting form. This helps to retain the indentation and formatting of the text, and also helps avoid characters in the code as being interpreted as formatting (by the 'forum software'). ..And it also makes it pretty - but perhaps I should not mention that (it seems so 'un-hacker').
And BTW, what is that standalone=''no" attribute in the opening XML element? Are you +sure+ you validated this in JaNeLA?