zhztheplayer commented on code in PR #13246:
URL: https://github.com/apache/arrow/pull/13246#discussion_r913967682


##########
java/dataset/src/main/cpp/jni_util.cc:
##########
@@ -162,11 +165,104 @@ std::shared_ptr<ReservationListener> 
ReservationListenableMemoryPool::get_listen
 
 ReservationListenableMemoryPool::~ReservationListenableMemoryPool() {}
 
+std::string Describe(JNIEnv* env, jthrowable t) {
+  jclass describer_class =
+      env->FindClass("org/apache/arrow/dataset/jni/JniExceptionDescriber");
+  jmethodID describe_method = env->GetStaticMethodID(
+      describer_class, "describe", 
"(Ljava/lang/Throwable;)Ljava/lang/String;");
+  std::string description = JStringToCString(
+      env, (jstring)env->CallStaticObjectMethod(describer_class, 
describe_method, t));
+  return description;
+}
+
+arrow::Result<bool> IsErrorInstanceOf(JNIEnv* env, jthrowable t, std::string 
class_name) {
+  jclass jclass = env->FindClass(class_name.c_str());
+  if (jclass == nullptr) {
+    return arrow::Status::Invalid("Class not found: " + class_name);

Review Comment:
   I changed to use `DCHECK` to guard against debug build since class_name is 
hard coded. Would you please take a look? Thanks.



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