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Top Forums Programming Problem using Java Native Interface on Debian Post 97009 by QED on Wednesday 25th of January 2006 10:59:24 AM
Old 01-25-2006
Problem using Java Native Interface on Debian

Hi all,

First visit to this forum, hope I've chosen an appropriate place to post this.

I have a Java-based application that uses native C++ libraries (built with g++-4.0) for specialized, computation-intensive routines.

Within the native code, I need to catch exceptions thrown inside called methods and throw a corresponding Java exception back to the JVM. This used to work just fine. But I am performing a rebuild after some time has past, and our platform itself (Debian testing) has had some upgrades (to glibc, etc.). Consequently, the desired functionality seems to be broken. The exceptions are not being caught in the new build.

Note: the same code built and tested on MS Windows platforms works just as expected.

Here is a snippet some of the code that is failing:
Code:
/*
 * Class:     informeta_mentys_api_license_FileLicense
 * Method:    nativeReadExpiry
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_informeta_mentys_api_license_FileLicense_nativeRea
(JNIEnv *env, jclass cls)
{
  jlong expiry(0);
  try
  {
    expiry = FileLicense::getInstance().readExpiry();
  }
  catch (LicenseException& e)
  {
    env->ThrowNew(Class_LicenseException, e.getMessage().c_str());
  }
  catch (JNIException&)
  {
    // Do nothing; exception already pending from failed JNI call
  }
  catch (...)
  {
    env->ThrowNew(Class_LicenseException, "unidentified runtime error");
  }
  return expiry;
}

Here is the error message that the system gives:
Code:
terminate called after throwing an instance of 'informeta::mentys::security::LicenseException'

Any input or advice would be terrific.

Matthew

P.S. I now realize that this is a poor choice of forum for my question. If it would be more appropriate, could a moderator please move this to Network Computing Topics > C Programming in the UNIX Environment. I see there is a g++-4.0 thread over there. Sorry.

Last edited by QED; 01-25-2006 at 12:20 PM..
 

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Printexc(3o)							   OCaml library						      Printexc(3o)

NAME
Printexc - Facilities for printing exceptions. Module Module Printexc Documentation Module Printexc : sig end Facilities for printing exceptions. val to_string : exn -> string Printexc.to_string e returns a string representation of the exception e . val print : ('a -> 'b) -> 'a -> 'b Printexc.print fn x applies fn to x and returns the result. If the evaluation of fn x raises any exception, the name of the exception is printed on standard error output, and the exception is raised again. The typical use is to catch and report exceptions that escape a func- tion application. val catch : ('a -> 'b) -> 'a -> 'b Printexc.catch fn x is similar to Printexc.print , but aborts the program with exit code 2 after printing the uncaught exception. This function is deprecated: the runtime system is now able to print uncaught exceptions as precisely as Printexc.catch does. Moreover, calling Printexc.catch makes it harder to track the location of the exception using the debugger or the stack backtrace facility. So, do not use Printexc.catch in new code. val print_backtrace : Pervasives.out_channel -> unit Printexc.print_backtrace oc prints an exception backtrace on the output channel oc . The backtrace lists the program locations where the most-recently raised exception was raised and where it was propagated through function calls. Since 3.11.0 val get_backtrace : unit -> string Printexc.get_backtrace () returns a string containing the same exception backtrace that Printexc.print_backtrace would print. Since 3.11.0 val record_backtrace : bool -> unit Printexc.record_backtrace b turns recording of exception backtraces on (if b = true ) or off (if b = false ). Initially, backtraces are not recorded, unless the b flag is given to the program through the OCAMLRUNPARAM variable. Since 3.11.0 val backtrace_status : unit -> bool Printexc.backtrace_status() returns true if exception backtraces are currently recorded, false if not. Since 3.11.0 val register_printer : (exn -> string option) -> unit Printexc.register_printer fn registers fn as an exception printer. The printer should return None or raise an exception if it does not know how to convert the passed exception, and Some s with s the resulting string if it can convert the passed exception. Exceptions raised by the printer are ignored. When converting an exception into a string, the printers will be invoked in the reverse order of their registrations, until a printer returns a Some s value (if no such printer exists, the runtime will use a generic printer). Since 3.11.2 OCamldoc 2012-06-26 Printexc(3o)
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