Can a C++ s-function that uses JNI to interface with a Java class be built into an executable with Simulink Coder?

I'm trying to make use of some 3rd party Java classes within a Simulink model. I've created a C++ wrapper to the classes that uses JNI, and I've built an s-function of that wrapper. It works fine when I run the model within Simulink, and I'm able to use the Coder to build an executable. However, running the executable fails with the following message:

# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x000000000040e4d2, pid=20518, tid=140630443198240
#
# JRE version: OpenJDK Runtime Environment (7.0_79-b14) (build 1.7.0_79-mockbuild_2015_05_14_07_23-b00)
# Java VM: OpenJDK 64-Bit Server VM (24.79-b02 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea 2.5.5
# Distribution: CentOS release 6.6 (Final), package rhel-2.5.5.3.el6_6-x86_64 u79-b14
# Problematic frame:
# C  [test_java_as_RSIM+0xe4d2]
#

I wondered if anything about the Coder would preclude the Java interface, and if not, whether anyone has any suggestions on getting this to work.

My code is as follows:

#include <stdio.h>
#include <jni.h>
#include "java_convert.h"

JNIEnv* get_or_create_vm(JavaVM **jvm, int* gc)
{
    JNIEnv* env;
    JavaVMInitArgs args;
    JavaVMOption* options = new JavaVMOption[1];
    args.version = JNI_VERSION_1_6;
    args.nOptions = 1;
    options[0].optionString = (char *)"-Djava.class.path=./myjavalibs/thirdparty.jar";
    args.options = options;
    args.ignoreUnrecognized = false;

      int n;
      int status;

  // try to get and attach to existing VM first
  status = JNI_GetCreatedJavaVMs(jvm, 1, (jsize*) &n);
  if (status == JNI_OK && n == 1) {
    status = (*jvm)->AttachCurrentThread((void**)&env, &args);
  }

  // if not successful, create a new VM
    if (status != JNI_OK || n != 1) {
        status = JNI_CreateJavaVM(jvm, (void**)&env, &args);
    *gc = 1;
  }

      //status = JNI_CreateJavaVM(jvm, (void**)&env, &args);

  delete options;
    return env;
}

jdouble invoke_class(JNIEnv* env, jdouble cas, jdouble altitude)
{
  jclass thirdparty_class;
    jmethodID convert_method;
    thirdparty_class = env->FindClass("common/utils/aClass");

  jthrowable exc;
  exc = env->ExceptionOccurred();
  if (exc) {
    env->ExceptionDescribe();
    env->ExceptionClear();
  }
  else {
      convert_method = env->GetStaticMethodID(thirdparty_class, "convertCasToTas", "(DD)D");
    return env->CallStaticDoubleMethod(thirdparty_class, convert_method, cas, altitude);
  }
}

double call_java_class(double cas, double altitude) 
{
    JavaVM *jvm = NULL;
    JNIEnv *env = NULL;
  int gc = 0;

      env = get_or_create_vm(&jvm, &gc);
      if(env == NULL)
          return -1;

      double tas = invoke_class(env, cas, altitude);

  if (gc == 1) {
    jvm->DestroyJavaVM();
  }

      return tas;
  }

Answer 1

[Randal Guendel]

I answered my own question: yes, Simulink Coder is able to handle the interface with Java. My problem was the call to DestroyJavaVM.