Grpc BlockingStub возвращает ноль ⇐ JAVA

[Anonymous]

Я пытаюсь использовать grpc в своем проекте, но у меня проблема, моя проблема на стороне клиента grpc. Я хочу использовать BlockingStub, однако он вызывает исключение NullPointerException. вот мои классы:
Common-Service Book.proto:
syntax = "proto3";
option java_multiple_files = true;
package com.ky;

service BookService {
rpc getBookIdByIsbn(Isbn) returns (BookIsbn);
}

message BookIsbn {
string bookId = 1;
string isbn = 2;
int32 stockCount = 3;
}

message Isbn{
string isbn = 1;
}

Книга-сервис bookServiceGrpcImpl:
package com.ky.bookservice.service;
import com.ky.BookIsbn;
import com.ky.BookServiceGrpc;
import com.ky.Isbn;
import com.ky.bookservice.dto.book.BookIsbnDto;
import com.ky.bookservice.dto.book.BookMapper;
import com.ky.bookservice.repository.BookRepository;

import io.grpc.stub.StreamObserver;
import net.devh.boot.grpc.server.service.GrpcService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@GrpcService
public class BookGrpcServiceImpl extends BookServiceGrpc.BookServiceImplBase {
private static final Logger logger = LoggerFactory.getLogger(BookGrpcServiceImpl.class);
private final BookRepository bookRepository;
private final BookMapper bookMapper;

public BookGrpcServiceImpl(BookRepository bookRepository, BookMapper bookMapper) {
this.bookRepository = bookRepository;
this.bookMapper = bookMapper;
}

@Override
public void getBookIdByIsbn(Isbn request, StreamObserver responseObserver) {
logger.info("Grpc Call Received: " + request.getIsbn());
BookIsbnDto bookIsbnDto = bookRepository
.findBookByIsbn(request.getIsbn())
.map(bookMapper::bookToBookIsbnDto)
.orElseThrow(() -> new RuntimeException("Book could not found by isbn: " + request.getIsbn()));
responseObserver.onNext(
BookIsbn.newBuilder()
.setBookId(bookIsbnDto.getId().toString())
.setIsbn(bookIsbnDto.getIsbn())
.setStockCount(bookIsbnDto.getStockCount())
.build()
);
responseObserver.onCompleted();
}
}

библиотечный сервис:
public class LibraryService {
private final LibraryRepository libraryRepository;
private final BookServiceClient bookServiceClient;
private final UserServiceClient userServiceClient;
private final LibraryMapper libraryMapper;

@GrpcClient("book-service")
private BookServiceGrpc.BookServiceBlockingStub bookServiceStub;

Logger logger = LoggerFactory.getLogger(LibraryService.class);

public LibraryService(LibraryRepository libraryRepository, BookServiceClient bookServiceClient, UserServiceClient userServiceClient, LibraryMapper libraryMapper) {
this.libraryRepository = libraryRepository;
this.bookServiceClient = bookServiceClient;
this.userServiceClient = userServiceClient;
this.libraryMapper = libraryMapper;
}

public void addBookToLibrary(AddBookRequest addBookRequest){
BookIsbn bookId = bookServiceStub.getBookIdByIsbn(Isbn.newBuilder().setIsbn(addBookRequest.getIsbn()).build());

Library library = libraryRepository.findById(addBookRequest.getId())
.orElseThrow(() -> new LibraryNotFoundException("Library could not found by id: " + addBookRequest.getId()));

library.getUserBook().add(UUID.fromString(bookId.getBookId()));

libraryRepository.save(library);
}
}

сгенерированный класс BookServiceBlockingStub:
public static final class BookServiceBlockingStub extends io.grpc.stub.AbstractStub {
private BookServiceBlockingStub(io.grpc.Channel channel) {
super(channel);
}

private BookServiceBlockingStub(io.grpc.Channel channel,
io.grpc.CallOptions callOptions) {
super(channel, callOptions);
}

@java.lang.Override
protected BookServiceBlockingStub build(io.grpc.Channel channel,
io.grpc.CallOptions callOptions) {
return new BookServiceBlockingStub(channel, callOptions);
}

/**
*/
public com.ky.common.proto.BookIsbn getBookIdByIsbn(com.ky.common.proto.Isbn request) {
return blockingUnaryCall(
getChannel(), METHOD_GET_BOOK_ID_BY_ISBN, getCallOptions(), request);
}
}

когда я пытаюсь использовать метод addBookToLibrary, я выдает такую ​​ошибку, в чем проблема. Спасибо:
java.lang.NullPointerException: Cannot invoke "com.ky.BookServiceGrpc$BookServiceBlockingStub.getBookIdByIsbn(com.ky.Isbn)" because "this.bookServiceStub" is null
at com.ky.libraryservice.service.LibraryService.addBookToLibrary(LibraryService.java:97) ~[classes/:na]
at com.ky.libraryservice.controller.LibraryController.addBookToLibrary(LibraryController.java:29) ~[classes/:na]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:578) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-6.0.11.jar:6.0.11]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1081) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:974) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011) ~[spring-webmvc-6.0.11.jar:6.0.11]
at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:925) ~[spring-webmvc-6.0.11.jar:6.0.11]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:593) ~[tomcat-embed-core-10.1.12.jar:6.0]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.0.11.jar:6.0.11]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.12.jar:6.0]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.11.jar:6.0.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.11.jar:6.0.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.11.jar:6.0.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.11.jar:6.0.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.11.jar:6.0.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.11.jar:6.0.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:166) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:894) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1740) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-10.1.12.jar:10.1.12]
at java.base/java.lang.Thread.run(Thread.java:1589) ~[na:na]


Подробнее здесь: https://stackoverflow.com/questions/770 ... turns-null