fix: select correct runtime when calling from different threads and improve error message

Author: edusperoni

test-app/runtime/src/main/cpp/NativeScriptException.cpp

@@ -143,6 +143,34 @@ void NativeScriptException::Init() {
     assert(NATIVESCRIPTEXCEPTION_GET_MESSAGE_METHOD_ID != nullptr);
 }
 
+std::string NativeScriptException::ToString() const {
+    std::stringstream ss;
+    if (!m_javaException.IsNull()) {
+        JEnv env;
+        std::string message = GetExceptionMessage(env, m_javaException);
+        std::string stackTrace = GetExceptionStackTrace(env, m_javaException);
+        ss << "Java Exception: " << message << "\n" << stackTrace;
+    } else if (m_javascriptException != nullptr) {
+        ss << "JavaScript Exception: " << m_message << "\n" << m_stackTrace;
+    } else if (!m_message.empty()) {
+        ss << "Exception Message: " << m_message << "\n" << m_stackTrace;
+    } else {
+        ss << "No exception information available.";
+    }
+    return ss.str();
+}
+
+std::string NativeScriptException::GetErrorMessage() const {
+    if(!m_javaException.IsNull()) {
+        JEnv env;
+        return GetExceptionMessage(env, m_javaException);
+    } else if (m_javascriptException != nullptr) {
+        return m_message;
+    } else {
+        return m_message.empty() ? "No exception message available." : m_message;
+    }
+}
+
 // ON V8 UNCAUGHT EXCEPTION
 void NativeScriptException::OnUncaughtError(Local<Message> message, Local<Value> error) {
     string errorMessage = GetErrorMessage(message, error);
@@ -375,7 +403,7 @@ string NativeScriptException::GetErrorStackTrace(const Local<StackTrace>& stackT
     return ss.str();
 }
 
-string NativeScriptException::GetExceptionMessage(JEnv& env, jthrowable exception) {
+string NativeScriptException::GetExceptionMessage(JEnv& env, jthrowable exception) const {
     string errMsg;
     JniLocalRef msg(env.CallStaticObjectMethod(NATIVESCRIPTEXCEPTION_CLASS, NATIVESCRIPTEXCEPTION_GET_MESSAGE_METHOD_ID, exception));
 
@@ -388,7 +416,7 @@ string NativeScriptException::GetExceptionMessage(JEnv& env, jthrowable exceptio
     return errMsg;
 }
 
-string NativeScriptException::GetExceptionStackTrace(JEnv& env, jthrowable exception) {
+string NativeScriptException::GetExceptionStackTrace(JEnv& env, jthrowable exception) const {
     string errStackTrace;
     JniLocalRef msg(env.CallStaticObjectMethod(NATIVESCRIPTEXCEPTION_CLASS, NATIVESCRIPTEXCEPTION_GET_STACK_TRACE_AS_STRING_METHOD_ID, exception));
 

test-app/runtime/src/main/cpp/NativeScriptException.h

@@ -33,6 +33,9 @@ class NativeScriptException {
         void ReThrowToV8();
         void ReThrowToJava();
 
+        std::string ToString() const;
+        std::string GetErrorMessage() const;
+
         static void Init();
 
         /*
@@ -54,12 +57,12 @@ class NativeScriptException {
         /*
          * Gets java exception message from jthrowable
          */
-        std::string GetExceptionMessage(JEnv& env, jthrowable exception);
+        std::string GetExceptionMessage(JEnv& env, jthrowable exception) const;
 
         /*
          * Gets java exception stack trace from jthrowable
          */
-        std::string GetExceptionStackTrace(JEnv& env, jthrowable exception);
+        std::string GetExceptionStackTrace(JEnv& env, jthrowable exception) const;
 
         /*
          * Gets the member m_javaException, wraps it and creates a javascript error object from it

test-app/runtime/src/main/cpp/ObjectManager.cpp

@@ -105,14 +105,23 @@ JniLocalRef ObjectManager::GetJavaObjectByJsObject(
   JSInstanceInfo* jsInstanceInfo = GetJSInstanceInfo(object);
 
   if (jsInstanceInfo != nullptr) {
+    jweak existingObject;
+    try {
+      existingObject = GetJavaObjectByID(jsInstanceInfo->JavaObjectID);
+    } catch (const NativeScriptException& e) {
+      // this captures usually the error
+      auto className = GetClassName(jsInstanceInfo->ObjectClazz);
+      throw NativeScriptException("Failed to get Java object by ID. id=" +
+                                  std::to_string(jsInstanceInfo->JavaObjectID) +
+                                  ", class=" + className + ". " +
+                                  e.GetErrorMessage());
+    }
     if (m_useGlobalRefs) {
-      JniLocalRef javaObject(GetJavaObjectByID(jsInstanceInfo->JavaObjectID),
-                             true);
+      JniLocalRef javaObject(existingObject, true);
       return javaObject;
     } else {
       JEnv env;
-      JniLocalRef javaObject(
-          env.NewLocalRef(GetJavaObjectByID(jsInstanceInfo->JavaObjectID)));
+      JniLocalRef javaObject(env.NewLocalRef(existingObject));
       return javaObject;
     }
   }

test-app/runtime/src/main/java/com/tns/Runtime.java

@@ -1246,7 +1246,8 @@ public static Object callJSMethodWithDelay(Object javaObject, String methodName,
     public static Object callJSMethod(Object javaObject, String methodName, Class<?> retType, boolean isConstructor, long delay, Object... args) throws NativeScriptException {
         Runtime runtime = Runtime.getCurrentRuntime();
 
-        if (runtime == null) {
+        // if we're not in a runtime or the runtime we're in does not have the object, try to find the right one (this might happen if a worker fires a JS method on an object created in the main thread or another worker)
+        if (runtime == null || runtime.getJavaObjectID(javaObject) == null) {
             runtime = getObjectRuntime(javaObject);
         }