From 39d59fd1d0f660171b7421bd70c67ec9a0383919 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sat, 2 May 2020 03:42:00 +0200
Subject: JNI helper_base: Robustness: Add java_exception_check_and_throw(..)
 and use InternalError for exceptions.

---
 java/jni/helper_base.cxx | 19 +++++++++++--------
 java/jni/helper_base.hpp | 13 ++++++++-----
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/java/jni/helper_base.cxx b/java/jni/helper_base.cxx
index c72de97..f96dd9f 100644
--- a/java/jni/helper_base.cxx
+++ b/java/jni/helper_base.cxx
@@ -41,6 +41,7 @@
 jfieldID getInstanceField(JNIEnv *env, jobject obj)
 {
     jclass clazz = env->GetObjectClass(obj);
+    java_exception_check_and_throw(env, E_FILE_LINE);
     // J == long
     return env->GetFieldID(clazz, "nativeInstance", "J");
 }
@@ -48,10 +49,10 @@ jfieldID getInstanceField(JNIEnv *env, jobject obj)
 jclass search_class(JNIEnv *env, const char *clazz_name)
 {
     jclass clazz = env->FindClass(clazz_name);
+    java_exception_check_and_throw(env, E_FILE_LINE);
     if (!clazz)
     {
-        std::string error = "no class found: "; error += clazz_name;
-        throw std::runtime_error(error);
+        throw direct_bt::InternalError(std::string("no class found: ")+clazz_name, E_FILE_LINE);
     }
     return clazz;
 }
@@ -59,10 +60,10 @@ jclass search_class(JNIEnv *env, const char *clazz_name)
 jclass search_class(JNIEnv *env, jobject obj)
 {
     jclass clazz = env->GetObjectClass(obj);
+    java_exception_check_and_throw(env, E_FILE_LINE);
     if (!clazz)
     {
-        std::string error = "no class found: ";
-        throw std::runtime_error(error);
+        throw direct_bt::InternalError("no class found", E_FILE_LINE);
     }
     return clazz;
 }
@@ -79,10 +80,11 @@ jmethodID search_method(JNIEnv *env, jclass clazz, const char *method_name,
     {
         method = env->GetMethodID(clazz, method_name, prototype);
     }
+    java_exception_check_and_throw(env, E_FILE_LINE);
 
     if (!method)
     {
-        throw std::runtime_error("no method found\n");
+        throw direct_bt::InternalError(std::string("no method found: ")+method_name, E_FILE_LINE);
     }
 
     return method;
@@ -100,10 +102,11 @@ jfieldID search_field(JNIEnv *env, jclass clazz, const char *field_name,
     {
         field = env->GetFieldID(clazz, field_name, type);
     }
+    java_exception_check_and_throw(env, E_FILE_LINE);
 
     if (!field)
     {
-        throw std::runtime_error("no method found\n");
+        direct_bt::InternalError(std::string("no field found: ")+field_name, E_FILE_LINE);
     }
 
     return field;
@@ -125,7 +128,7 @@ bool from_jboolean_to_bool(jboolean val)
         }
         else
         {
-            throw std::invalid_argument("the jboolean value is not true/false\n");
+            throw direct_bt::InternalError("the jboolean value is not true/false", E_FILE_LINE);
         }
     }
 
@@ -173,7 +176,7 @@ jobject get_new_arraylist(JNIEnv *env, unsigned int size, jmethodID *add)
     jobject result = env->NewObject(arraylist_class, arraylist_ctor, size);
     if (!result)
     {
-        throw std::runtime_error("cannot create instance of class\n");
+        throw direct_bt::InternalError("Cannot create instance of class ArrayList", E_FILE_LINE);
     }
 
     *add = search_method(env, arraylist_class, "add", "(Ljava/lang/Object;)Z", false);
diff --git a/java/jni/helper_base.hpp b/java/jni/helper_base.hpp
index ad6709b..e82df0f 100644
--- a/java/jni/helper_base.hpp
+++ b/java/jni/helper_base.hpp
@@ -54,8 +54,9 @@ template <typename T>
 T *castInstance(jlong instance)
 {
     T *t = reinterpret_cast<T *>(instance);
-    if (t == nullptr)
+    if (t == nullptr) {
         throw std::runtime_error("Trying to cast null object");
+    }
     return t;
 }
 
@@ -64,16 +65,18 @@ T *getInstance(JNIEnv *env, jobject obj)
 {
     jlong instance = env->GetLongField(obj, getInstanceField(env, obj));
     T *t = reinterpret_cast<T *>(instance);
-    if (t == nullptr)
+    if (t == nullptr) {
         throw std::runtime_error("Trying to acquire null object");
+    }
     return t;
 }
 
 template <typename T>
 void setInstance(JNIEnv *env, jobject obj, T *t)
 {
-    if (t == nullptr)
+    if (t == nullptr) {
         throw std::runtime_error("Trying to create null object");
+    }
     jlong instance = reinterpret_cast<jlong>(t);
     env->SetLongField(obj, getInstanceField(env, obj), instance);
 }
@@ -90,7 +93,7 @@ jobject generic_clone(JNIEnv *env, jobject obj)
     jobject result = env->NewObject(generic_class, generic_ctor, (jlong)copy_generic);
     if (!result)
     {
-        throw std::runtime_error("cannot create instance of class\n");
+        throw std::runtime_error("cannot create instance of class");
     }
 
     return result;
@@ -119,7 +122,7 @@ jobject convert_vector_to_jobject(JNIEnv *env, std::vector<std::unique_ptr<T>>&
         jobject object = env->NewObject(clazz, clazz_ctor, (jlong)elem);
         if (!object)
         {
-            throw std::runtime_error("cannot create instance of class\n");
+            throw direct_bt::InternalError("cannot create instance of class", E_FILE_LINE);
         }
         env->CallBooleanMethod(result, arraylist_add, object);
     }
-- 
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