testing native exceptions

kmath-noa/build.gradle.kts

@@ -42,8 +42,10 @@ val generateJNIHeader by tasks.registering {
     doLast {
         exec {
             workingDir(projectDir.resolve("src/main/java/space/kscience/kmath/noa"))
-            commandLine("$javaHome/bin/javac", "-h",
-                projectDir.resolve("src/main/resources") , "JNoa.java")
+            commandLine(
+                "$javaHome/bin/javac", "-h",
+                projectDir.resolve("src/main/resources"), "JNoa.java"
+            )
         }
     }
 }
@@ -78,12 +80,17 @@ val downloadTorch by tasks.registering(Download::class) {
     overwrite(false)
 }
 
-val downloadJNoa by tasks.registering(Download::class) {
+fun downloadJNoaHelper(update: Boolean) = tasks.registering(Download::class) {
     src("https://github.com/grinisrit/noa/archive/refs/heads/kmath.zip")
     dest(File("$thirdPartyDir/jnoa", "kmath.zip"))
-    overwrite(false)
+    overwrite(update)
 }
 
+val downloadJNoa by downloadJNoaHelper(false)
+
+val reDownloadJNoa by downloadJNoaHelper(true)
+
+
 val extractCMake by tasks.registering(Copy::class) {
     dependsOn(downloadCMake)
     from(tarTree(resources.gzip(downloadCMake.get().dest)))

kmath-noa/src/main/java/space/kscience/kmath/noa/JNoa.java

@@ -20,5 +20,6 @@ public class JNoa {
         }
     }
 
+    public static native void testException();
     public static native boolean cudaIsAvailable();
 }

kmath-noa/src/main/resources/space_kscience_kmath_noa_JNoa.h

@@ -7,6 +7,14 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
+/*
+ * Class:     space_kscience_kmath_noa_JNoa
+ * Method:    testException
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_space_kscience_kmath_noa_JNoa_testException
+  (JNIEnv *, jclass);
+
 /*
  * Class:     space_kscience_kmath_noa_JNoa
  * Method:    cudaIsAvailable

kmath-noa/src/test/kotlin/space/kscience/kmath/noa/TestUtils.kt

@@ -10,12 +10,16 @@ import kotlin.test.Test
 class TestUtils {
 
     @Test
-    fun testExceptions() {
+    fun throwingExceptions() {
         try {
-            println(cudaAvailable())
+            JNoa.testException()
         } catch(e:NoaException) {
-            println(e)
-            println("ALL GOOD")
+            println("Caught NoaException in JVM\n:$e")
         }
     }
+
+    @Test
+    fun cudaSupport() {
+        println("CUDA support available: ${cudaAvailable()}")
+    }
 }