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JNI from trusted applet

Posted on 1998-03-03
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Last Modified: 2008-02-26
How do I cause a trusted applet to load a native library?  When running as either of the following, the native libary is successfully loaded:

- An application, or
- Appletviewer with classpath set, the native library is loaded.  Running appletviewer with CLASSPATH set and the .jars in   that classpath causes the file loader to be used and applet restrictions don't exist

.  However, when I run appletviewer without classpath (causing applet class loader to be used), the native library cannot be loaded.  The dlls are in my Win NT PATH.

I configured appletviewer for trusted applets and get beyond the initial security restrictions, e.g., reading restricted system propertities, but fail when trying to load a library:

java.lang.UnsatisfiedLinkError: fixFloat
      at
[888940955234] 0 S 1 [Thread-5] class com.ibm.frn.DocViewThread obj.id:8065d5 in GETNEXTDOCUMENT
      at java.lang.ClassLoader.resolveClass(ClassLoader.java:245)
java.lang.UnsatisfiedLinkError: fixFloat
      at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)
      at
      at com.ibm.frn.EnvThread.run(EnvThread.java:87)
      at java.lang.ClassLoader.resolveClass(ClassLoader.java:245)
      at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)


The same problem (UnsatisfiedLinkError) occurs with Netscape Communicator with Java Activator.  The applet's jar file is signed, and Activator is configured for trusted applets.

What do trusted applets use to locate native libraries?  I don't think it's PATH (on Win NT) because my PATH is correct.
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Question by:dsanders030398
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jpk041897 earned 200 total points
ID: 1233397
As you tated you can use CLASSPTH.

Other option include placing the ative code on the same pat as the applet .class file or using the CODEBASE=path option inside the APPLET tag in your HTML file.

PATH will also work, but only if the PATH where the nativ code is stored is inside the web page servers directoy tree. The server willnot allow you to read/write files ouside of its web page directory structure for scurity reasons.
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