$ ls /usr/lib/x86_64-linux-gnu/cmake/jsoncpp
jsoncppConfig.cmake  jsoncppConfig-none.cmake

$ pkg-config --cflags --libs jsoncpp
-I/usr/include/jsoncpp -ljsoncpp

find_package(jsoncpp)

message("=== Jsoncpp: "
        "\n jsoncpp_FOUND = " ${jsoncpp_FOUND}
        "\n    jsoncpp_INCLUDE_DIRS = " ${jsoncpp_INCLUDE_DIRS}
        "\n    jsoncpp_INCLUDE_DIR = " ${jsoncpp_INCLUDE_DIR}
        "\n    jsoncpp_LIBRARIES = " ${jsoncpp_LIBRARIES}
        "\n    jsoncpp_LIBRARY = " ${jsoncpp_LIBRARY}
        "\n    jsoncpp_lib = " ${jsoncpp_lib})

=== Jsoncpp: 
 jsoncpp_FOUND = 1
    jsoncpp_INCLUDE_DIRS = 
    jsoncpp_INCLUDE_DIR = 
    jsoncpp_LIBRARIES = 
    jsoncpp_LIBRARY = 
    jsoncpp_lib = 

set(jsoncpp_INCLUDE_DIR "/usr/include/jsoncpp")
set(jsoncpp_LIBRARY "jsoncpp")

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOMOC ON)
find_package(Qt5Core)
...
target_link_libraries(${PROJECT_NAME} Qt5::Core)

find_package(OpenSSL REQUIRED)
include_directories(${OPENSSL_INCLUDE_DIR})
#...
target_link_libraries(${PROJECT_NAME} ${OPENSSL_LIBRARIES})

undefined reference to symbol 'OPENSSL_sk_num@@OPENSSL_1_1_0'

 ldconfig -p | grep ssl
	libssl3.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libssl3.so
	libssl.so.1.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libssl.so.1.1
	libssl.so.1.0.0 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
	libssl.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libssl.so
	libevent_openssl-2.1.so.6 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libevent_openssl-2.1.so.6

std::vector<uchar> bu;

message MyData
{
   // ...
   string image = 18;
   // ...
}

std::string((char*)bu.data(), bu.size());

[libprotobuf ERROR google/protobuf/wire_format_lite.cc:577] String field 'myservice.getMyData.image' contains invalid UTF-8 data when serializing a protocol buffer. Use the 'bytes' type if you intend to send raw bytes. 

note:   no known conversion for argument 1 from ‘std::vector<unsigned char>’ to ‘const string& {aka const std::__cxx11::basic_string<char>&}’

lists=`ls *so*`
TARGET=/home/user/work/libs
for name in $lists ; do
    res=`ldconfig -p | grep $name`
    if [ -z "$res" ] ; then
        echo "[+] $name"
        cp $name $TARGET
    else
        echo "[-] $name"
    fi
done

UnsatisfiedLinkError: /home/user/mylibrary/bin/mylibrary.so: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.27' not found (required by /home/user/libs/libopencv_imgproc.so.4.3)

$ cat src/wrapper/Client.java 
package wrapper;

import java.io.IOException;

public class Client {

    native long create();
    native void start(long ptr);

    static {
        System.load(System.getProperty("user.dir")+"/bin/libclient.so");
    }

     public static void main(String[] args) throws Exception{

        Client client = new Client();
        long ptr = client.create();
        client.start(ptr);

        char ch;
        ch = (char) System.in.read();
    }
    
}

$ cat bin/wrapper_Client.h 
#include <jni.h>

#ifndef _Included_wrapper_Client
#define _Included_wrapper_Client
#ifdef __cplusplus
extern "C" {
#endif
JNIEXPORT jlong JNICALL Java_wrapper_Client_create
  (JNIEnv *, jobject);

JNIEXPORT void JNICALL Java_wrapper_Client_start
  (JNIEnv *, jobject, jlong);

#ifdef __cplusplus
}
#endif
#endif

$ cat bin/wrapper_Client.cpp 
#include "wrapper_Client.h"
#include "qlibrary.h"


JNIEXPORT jlong JNICALL Java_wrapper_Client_create (JNIEnv *, jobject)
{
    jlong jresult = 0;
    Controller *controller;
    runApp(controller);
    *(Controller**) &jresult = controller;
    return jresult;
}


JNIEXPORT void JNICALL Java_wrapper_Client_start (JNIEnv *, jobject, jlong jptr)
{
    Controller *controller;
    controller = *(Controller **) &jptr;
    start(controller);
    
}

g++ -std=c++11 -shared -fPIC -DQLIBRARY_LIBRARY -DQT_DEPRECATED_WARNINGS -DQT_NO_DEBUG -DQT_CORE_LIB -I. -isystem /usr/include/x86_64-linux-gnu/qt5 -isystem /usr/include/x86_64-linux-gnu/qt5/QtCore -I. -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++ -o libclient.so  -I/usr/lib/jvm/java-11-openjdk-amd64/include/ -I/usr/lib/jvm/java-11-openjdk-amd64/include/linux/ wrapper_Client.cpp -lqlibrary -lQt5Core -lpthread

class Controller;

void runApp(Controller*&);
void start(Controller*&);
...

void runApp(Controller* &controller)
{
    std::thread th
    (
        [&]
        {
            int argc = 0;
            char *argv = nullptr;
            QCoreApplication app(argc, &argv);
            controller = new Controller;
            app.exec();
        }
    );
    th.detach();
}


void start(Controller*& controller)
{
    controller->start();
}
...

$ java -classpath bin wrapper.Client
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f4c9a4d08f4, pid=26982, tid=26984
#
# JRE version: OpenJDK Runtime Environment (11.0.7+10) (build 11.0.7+10-post-Ubuntu-2ubuntu218.04)
# Java VM: OpenJDK 64-Bit Server VM (11.0.7+10-post-Ubuntu-2ubuntu218.04, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V  [libjvm.so+0x7178f4]

class Worker : public QObject
{
    Q_OBJECT
public:
    // ...
    bool isWorking();

signals:
    void resultReady(int);

public slots:
    void doWork() {
        {
          QMutexLocker locker(&isWorkingLock_);
          isWorking_ = true;
        }
        // ...
        emit resulReady(res);
        {
          QMutexLocker locker(&isWorkingLock_);
          isWorking_ = false;
        }
    }

private:
    bool isWorking_ {false};
    QMutex isWorkingLock_;
};

    workerThread_.setPriority(QThread::LowestPriority);
    worker_->moveToThread(&workerThread_);
    connect(workerTimer_, &QTimer::timeout, worker_, &Worker::doWork);

    connect(workerTimer_, &QTimer::timeout, worker_, 
            [&]()
            {
                if (!worker_->isWorking()) {
                    qDebug() << "emit";
                    emit worker_->makeFrames();
                }
                else
                {
                    qDebug() << "not emit";

                }
            }
            );