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hello. I have been trying for three weeks to get my app to access a simple java class I have created and I always get the same error when executing the line 'Error: Java class not found: com/my/MySimpleClass'. const char* jclassName = “com/embarcadero/MySimpleClass”; jClass = env->FindClass(jclassName); MySimpleClass.java is : package com.embarcadero; import android.util.Log; public class MySimpleClass { public void loadLibrary(String jarPath) { try { Log.d("MySimpleClass", "Load JAR : " + jarPath); } catch (Exception e) { Log.e("MySimpleClass", "loading error JAR: " + e.getMessage()); } } public void sayHello() { Log.d("MySimpleClass", "¡Hello from the Java class!"); } } The code that I use from my small app (it only consists of one Form) is #ifndef MenuH #define MenuH //--------------------------------------------------------------------------- #include <System.Classes.hpp> #include <FMX.Controls.hpp> #include <FMX.Forms.hpp> #include <FMX.StdCtrls.hpp> #include <Androidapi.JNI.hpp> // Importante para JNI #include <Androidapi.JNI.JavaTypes.hpp> // Importante para JNI #include <System.Rtti.hpp> #include <FMX.Objects.hpp> #include <FMX.Types.hpp> class TFMenu : public TForm { __published: // IDE-managed Components TText *Text1; private: // User declarations jclass jClass; jobject jObject; jmethodID methodId; public: // User declarations __fastcall TFMenu(TComponent* Owner); __fastcall ~TFMenu(); //Destructor }; #include <fmx.h> #pragma hdrstop #include "Menu.h" #include <Androidapi.Helpers.hpp> // Para usar JNI #include <System.SysUtils.hpp> // Para la función Try #include <Androidapi.JNIBridge.hpp> #pragma package(smart_init) #pragma resource "*.fmx" TFMenu *FMenu; __fastcall TFMenu::TFMenu(TComponent* Owner) : TForm(Owner), jClass(nullptr), jObject(nullptr), methodId(nullptr) // Inicializar los punteros { JNIEnv* env = TJNIResolver::GetJNIEnv(); const char* jclassName = "com/embarcadero/MySimpleClass"; try { jClass = env->FindClass(jclassName); if (jClass == nullptr) { throw Exception("Error: Clase Java no encontrada: " + String(jclassName)); } jClass = (jclass)env->NewGlobalRef(jClass); jmethodID constructor = env->GetMethodID(jClass, "<init>", "()V"); if (constructor == nullptr) { throw Exception("Error: Constructor Java no encontrado"); } jObject = env->NewObject(jClass, constructor); if (jObject == nullptr) { throw Exception("Error: No se pudo crear la instancia de la clase Java"); } jObject = env->NewGlobalRef(jObject); // **¡IMPORTANTE: Referencia Global!** methodId = env->GetMethodID(jClass, "savHello", "()V"); if (methodId == nullptr) { throw Exception("Error: Método Java no encontrado"); } env->CallVoidMethod(jObject, methodId); } catch (const Exception& e) { ShowMessage(e.Message); if (jClass) { env->DeleteGlobalRef(jClass); jClass = nullptr; } if (jObject) { env->DeleteGlobalRef(jObject); jObject = nullptr; } methodId = nullptr; } } __fastcall TFMenu::~TFMenu() { JNIEnv* env = TJNIResolver::GetJNIEnv(); if (jClass) { env->DeleteGlobalRef(jClass); } if (jObject) { env->DeleteGlobalRef(jObject); } } I created the MySimpleClass.jar file and included in MyProyect/Java/ and it in my remote path (deployment) “.\library”. My configuration is C++BUILDER 11.1, Android Platform 32 bits, java 1.8, sdk 25, ndk 22; Please, I am very frustrated. Can anyone help me? thank.