Quarkus：注入華麗存儲庫上的 NPE

Question

我目前正在學習 quarkus 並制作一個簡單的員工服務程序。 盡管 quarkus 在我的 SQL 數據庫上成功連接，但當您執行 GET 請求時，它會在 employeeRepository 上引發 NullPointerException。 有什么想法嗎？

我的 Model

import io.quarkus.hibernate.reactive.panache.PanacheEntity;

import javax.persistence.Entity;
import javax.persistence.Id;
import java.time.LocalDateTime;
import java.util.UUID;

@Entity
public class Employee extends PanacheEntity {

    private UUID id ;
    private String first_name;
    private String last_name;
    private String full_name;
    private String email;
    private String phone;
    private int age;
//    private LocalDateTime created ;
//    private LocalDateTime updated;
    private enum profession {
        designer,
        data_sientist,
        programmer,
        web_developer,
        tester,
        computer_engineer,
        secretary,
        professional_cleaner,
        security
    }

    public UUID getId() {
        return id;
    }

    public void setId(UUID id) {
        this.id = id;
    }

    public String getFirst_name() {
        return first_name;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public String getLast_name() {
        return last_name;
    }

    public void setLast_name(String last_name) {
        this.last_name = last_name;
    }

    public String getFull_name() {
        return full_name;
    }

    public void setFull_name(String full_name) {
        this.full_name = full_name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

//    public LocalDateTime getCreated() {
//        return created;
//    }
//
//    public void setCreated(LocalDateTime created) {
//        this.created = created;
//    }
//
//    public LocalDateTime getUpdated() {
//        return updated;
//    }
//
//    public void setUpdated(LocalDateTime updated) {
//        this.updated = updated;
//    }
}

我的倉庫

import gr.quarkus.tutorials.models.Employee;
import io.quarkus.hibernate.reactive.panache.PanacheRepository;
import io.smallrye.mutiny.Uni;

import javax.enterprise.context.ApplicationScoped;
import java.util.List;
import java.util.UUID;

@ApplicationScoped
public class EmployeeRepository implements PanacheRepository<Employee> {

    public Uni<List<Employee>> findAllEmployees(){
        return Employee.listAll() ;
    }

    public Uni<Employee> findById(UUID id) {
        return Employee.findById(id);
    }
}

我的服務

import gr.quarkus.tutorials.models.Employee;
import gr.quarkus.tutorials.repositories.EmployeeRepository;
import io.smallrye.mutiny.Uni;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.ws.rs.core.Response;
import java.util.UUID;

@ApplicationScoped
public class EmployeeService {

    @Inject
    EmployeeRepository employeeRepository ;

    public Uni<Response> getAllEmployees(){
        return Uni.createFrom().item(Response.ok(employeeRepository.listAll()).build());
    }
    public Uni<Employee> getEmployeeById(UUID id){
        return employeeRepository.findById(id);
    }
    public Uni<Employee> createEmployee(Employee employee){
        employeeRepository.persist(employee);
        return Uni.createFrom().item(employeeRepository.isPersistent(employee))
                .onItem().transform(item ->{
                    if(item){
                        return employee;
                    }
                    return null;
                }) ;
    }

}

最后是我的資源

import gr.quarkus.tutorials.models.Employee;
import gr.quarkus.tutorials.services.EmployeeService;
import io.smallrye.mutiny.Uni;

import javax.enterprise.context.ApplicationScoped;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.UUID;

@Path("/employees")
@ApplicationScoped
@Produces("application/json")
@Consumes("application/json")
public class EmployeeResources {

    EmployeeService employeeService = new EmployeeService();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Uni<Response> getAll(){
        return employeeService.getAllEmployees();
    }
    @GET
    @Path("/{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Uni<Employee> getFromId(@PathParam("id") UUID id){
        return employeeService.getEmployeeById(id);
    }

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Uni<Employee> create(Employee employee){
        return employeeService.createEmployee(employee);
    }

}

StackTrace 也很有用

2022-08-01 18:03:00,872 ERROR [io.qua.ver.htt.run.QuarkusErrorHandler] (vert.x-eventloop-thread-2) HTTP Request to /employees failed, error id: 135fc24c-18f0-4486-bba7-c4d10b18ba79-1: java.lang.NullPointerException
        at gr.quarkus.tutorials.services.EmployeeService.getAllEmployees(EmployeeService.java:19)
        at gr.quarkus.tutorials.resources.EmployeeResources.getAll(EmployeeResources.java:25)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass.getAll$$superforward1(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass$$function$$3.apply(Unknown Source)
        at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:53)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.proceed(InvocationInterceptor.java:62)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.monitor(InvocationInterceptor.java:49)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor_Bean.intercept(Unknown Source)
        at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
        at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:40)
        at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass.getAll(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources_ClientProxy.getAll(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources$quarkusrestinvoker$getAll_4e4e1bfcee3a98554de3d48a31a31533fa53b86f.invoke(Unknown Source)
        at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
        at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:108)
        at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:140)
        at org.jboss.resteasy.reactive.server.handlers.RestInitialHandler.beginProcessing(RestInitialHandler.java:49)
        at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:17)
        at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:7)
        at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
        at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:173)
        at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
        at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:84)
        at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:71)
        at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
        at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:136)
        at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
        at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$1(StaticHandlerImpl.java:290)
        at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:141)
        at io.vertx.core.impl.future.FutureBase.lambda$emitSuccess$0(FutureBase.java:54)
        at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)


2022-08-01 18:03:01,006 ERROR [org.jbo.res.rea.com.cor.AbstractResteasyReactiveContext] (vert.x-eventloop-thread-2) Request failed: java.lang.NullPointerException
        at gr.quarkus.tutorials.services.EmployeeService.getAllEmployees(EmployeeService.java:19)
        at gr.quarkus.tutorials.resources.EmployeeResources.getAll(EmployeeResources.java:25)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass.getAll$$superforward1(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass$$function$$3.apply(Unknown Source)
        at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:53)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.proceed(InvocationInterceptor.java:62)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor.monitor(InvocationInterceptor.java:49)
        at io.quarkus.arc.runtime.devconsole.InvocationInterceptor_Bean.intercept(Unknown Source)
        at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
        at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:40)
        at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
        at gr.quarkus.tutorials.resources.EmployeeResources_Subclass.getAll(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources_ClientProxy.getAll(Unknown Source)
        at gr.quarkus.tutorials.resources.EmployeeResources$quarkusrestinvoker$getAll_4e4e1bfcee3a98554de3d48a31a31533fa53b86f.invoke(Unknown Source)
        at org.jboss.resteasy.reactive.server.handlers.InvocationHandler.handle(InvocationHandler.java:29)
        at io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext.invokeHandler(QuarkusResteasyReactiveRequestContext.java:108)
        at org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext.run(AbstractResteasyReactiveContext.java:140)
        at org.jboss.resteasy.reactive.server.handlers.RestInitialHandler.beginProcessing(RestInitialHandler.java:49)
        at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:17)
        at org.jboss.resteasy.reactive.server.vertx.ResteasyReactiveVertxHandler.handle(ResteasyReactiveVertxHandler.java:7)
        at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
        at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:173)
        at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
        at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:84)
        at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:71)
        at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
        at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:136)
        at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
        at io.vertx.ext.web.handler.impl.StaticHandlerImpl.lambda$sendStatic$1(StaticHandlerImpl.java:290)
        at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:141)
        at io.vertx.core.impl.future.FutureBase.lambda$emitSuccess$0(FutureBase.java:54)
        at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
        at java.base/java.lang.Thread.run(Thread.java:829)

Answer 1

您需要使用@Inject EmployeeService employeeService而不是手動實例化它。