小编Mik*_*ike的帖子

我正在使用Windows 10 Home，连接到docker时出现此错误：

ERRO[0044] failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?: dial tcp 192.168.99.101:2376: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
context canceled

有人可以帮忙吗？我见过适用于Linux和OS的解决方案，但不适用于Windows

当我对数据库中的所有新闻发出请求时，我使用这样的 PageRequest：

public Page<StatusUpdate> getPageSiteUser(int pageNumber) {

    PageRequest request = new PageRequest(pageNumber-1, pageSize, Sort.Direction.DESC, "added");

    return statusUpdateDao.findAll(request);
}

它以完美的顺序显示每个页面中的所有新闻。

但是现在，我想选择一个用户创建的新闻，采用相同的 Pageable 格式（不是所有新闻），但我不知道该怎么做，所以我一定是在某处犯了一个愚蠢的错误......应该是就像是...

 public Page<StatusUpdate> findMyStatusUpdates(Long user_id, int pageNumber) {

    PageRequest request = new PageRequest(pageNumber-1, pageSize, Sort.Direction.DESC, "added"); 
    return statusUpdateDao.findAll(request);
}

如果可以，请回答该理论的链接。文档讨论排序，而不是进行实际选择（在此处输入链接描述）

我有一个使用生成器yo jhipster：import-jdl在Jhipster中运行的项目。结束时，一切都准备就绪，可以开始使用了。这是我想在H2永久磁盘副本中轻松进行测试，更改等操作以重新开始时要返回的状态。

我猜想每次启动项目时使用H2非永久性内存都会创建所有内容，但是有没有简单的方法可以将结果作为磁盘永久性类型呢？（请确认）

或者，更好的方法是，在启动项目之前，有没有办法让Jhipter随意地从内存更改为持久性数据库，再更改为内存持久性？

如果没有办法随意更改，我用谷歌搜索了一个解决方案，看来我应该定期删除所有对象重置嵌入式H2数据库 ，然后我不知道该怎么做才能获得一个干净的数据库。

我有一个这样的对象：

import { Moment } from 'moment';

export interface INewsletter {
    id?: number;
    creationDate?: Moment;
    email?: string;
}

export class Newsletter implements INewsletter {
    constructor(public id?: number, public creationDate?: Moment, public email?: string) {}
}

在一个地方，我需要从我正在使用的表单中获取日期，但在第二种情况下，这给我带来了问题，我只需要从系统获取日期并在新创建的对象中使用它（没有错误，我不明白，因为日期也是一个时刻）。

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';
import { HttpResponse, HttpErrorResponse } from '@angular/common/http';
import { Observable } from 'rxjs';
import * as moment from 'moment';
import { DATE_TIME_FORMAT } from 'app/shared/constants/input.constants';

import { INewsletter } from 'app/shared/model/newsletter.model'; …

我遇到了我不明白的异常。我有一个控制器，它给我一个新闻对象，它出现在控制台中，所以获取实际的新闻对象不是问题，

@RequestMapping(value ="/viewonestatus/{id}")
public ModelAndView viewOneStatus(@PathVariable("id") Long id) {

    System.out.println("!!!!!! STATUSUPDATECONTROLLER: viewOneStatus : Empezamos con el ID del Anuncio: " + id);

    StatusUpdate status = statusUpdateService.get(id);

    ModelAndView modelAndView = new ModelAndView();
    System.out.println("!!!!!! STATUSUPDATECONTROLLER: viewOneStatus : Empezamos con el ID del Anuncio: " + status);

    modelAndView.getModel().put("status", status);

    modelAndView.setViewName("viewonestatus");

    return modelAndView;
}

.... 但是当尝试执行 JSP 时，它给了我以下错误，即使 JSP 几乎是空的，例如....

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%> 
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>

hello world

Exception: Exception: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed …

我收到一个奇怪的错误，我不明白为什么...因为它说找不到的 id 在 URL 中：http://192.168.160.128:8080/deleteproposal /4 并且我有类似的 requestMethod，工作正常。 ..

异常：org.springframework.web.bind.MissingServletRequestParameterException：必需的长参数“id”不存在失败的URL： http: //192.168.160.128 :8080/deleteproposal/4异常消息：必需的长参数“id”不存在

        org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.handleMissingValue(RequestParamMethodArgumentResolver.java:251)

        org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:96)

        org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99)

        org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161)

        org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)

        org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)

        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832)

        org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743)

        org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)

        org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)

        org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)

        org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)

        org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)

        javax.servlet.http.HttpServlet.service(HttpServlet.java:622)

        org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)

        javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)

        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

        org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:316)

        org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)

        org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:122)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:169)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:48)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:205)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:120)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:96)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:53)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

        org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)

        org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)

        org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)

        org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)

        org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)

        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

        org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

        org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:87)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

        org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)

        org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)

        org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)

        org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) …

这很好用:

@Repository
public interface VoteDao extends CrudRepository <Vote, Long> {

@Query(value = "select sum(points) from votes where siteuserid= ?1", nativeQuery = true)
int countBySiteUser(@Param("user") SiteUser user);
}

除非在没有投票的情况下结果为NULL并且问题是我不知道如何处理检查何时为Null,因为当我问...时查询没有返回任何内容...

    System.out.println("!!!!: PROPOSAL VoteService: " + voteDao.countBySiteUser(user));

它应该为该sysout打印Null值吗？DAO应该以NULL值回答,但事实并非如此.如果提供,我将能够处理该NULL,但它没有.

在此先感谢您的帮助!

我试图将 Long 值（id）转换为使用 private LongFilter postId 的类 TagCriteria 的 LongFilter；创建一个可以用来查询的对象

public ResponseEntity<List<TagDTO>> getAllTags(TagCriteria criteria, Pageable pageable)

但我不知道如何做到这一点，因为 Java 文档对我来说并不是很清楚。

public class TagCriteria implements Serializable {
    private static final long serialVersionUID = 1L;
    private LongFilter id;
    private StringFilter tagName;
    private LongFilter postId;

    public TagCriteria() {
    }
}

可比较类型的过滤器类，可以解释小于/大于/等关系。它可以作为成员添加到条件类中，以支持以下查询参数：

  fieldName.equals = 42
  fieldName.specified = true
  fieldName.specified = false
  fieldName.in = 43,42
  fieldName.greaterThan = 41
  fieldName.lessThan = 44
  fieldName.greaterOrEqualThan = 42
  fieldName.lessOrEqualThan = 44

由于类型转换的问题，应该使用后代类，其中泛型类型参数被具体化。

类型参数：

<FIELD_TYPE> the type of filter.

See also: …

在哪里可以找到有关 JDL 中的瞬间的信息？它与日期格式有何关系......？

除此之外： https: //www.jhipster.tech/jdl/

可用的字段类型和约束 以下是 JDL 支持的类型：

SQL          MongoDB    Cassandra   Validations
Instant      Instant    Instant     required

LocalDate   LocalDate   required    required
ZonedDateTime   ZonedDateTime       required

谢谢

我在 GAE (Postgres 9.6) 上部署的 Jhipster 应用程序遇到此错误，但我没有在本地 DB H2 中遇到此错误：

common frames omitted Caused by: org.postgresql.util.PSQLException: ERROR: column "image" is of type bytea but expression is of type oid

来自实体照片：

package es.mibar.web.domain;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

import javax.persistence.*;
import javax.validation.constraints.*;

import java.io.Serializable;
import java.time.Instant;

/**
 * A Photo.
 */
@Entity
@Table(name = "photo")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Photo implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequenceGenerator")
    @SequenceGenerator(name = …