解决Spring Spring Data JPA 错误： Page 1 of 1 containing UNKNOWN instances

SpringBoot 整合 Spring-Data-JPA 的时候出现此问题:

前端 js 代码

$(function () {var searchText = $('.search').find('input').val()var columns = [];columns.push({title: '分类',field: 'category',align: 'center',valign: 'middle',formatter: function (value, row, index) {return value}}, {title: '美图',field: 'url',align: 'center',valign: 'middle',formatter: function (value, row, index) {return "![](" + value + ")"}})$.extend($.fn.bootstrapTable.defaults, $.fn.bootstrapTable.locales['zh-CN']);$('#meituFavoriteTable').bootstrapTable({url: 'meituSearchFavoriteJson',sidePagination: "server",queryParamsType: 'page,size',contentType: "application/x-www-form-urlencoded",method: 'get',striped: false,     //是否显示行间隔色cache: false,      //是否使用缓存，默认为true，所以一般情况下需要设置一下这个属性（*）pagination: true,  //是否显示分页（*）paginationLoop: true,paginationHAlign: 'right', //right, leftpaginationVAlign: 'bottom', //bottom, top, bothpaginationDetailHAlign: 'left', //right, leftpaginationPreText: ' 上一页',paginationNextText: '下一页',search: true,searchText: searchText,searchTimeOut: 500,searchAlign: 'right',searchOnEnterKey: false,trimOnSearch: true,sortable: true,    //是否启用排序sortOrder: "desc",   //排序方式sortName: "id",pageNumber: 1,     //初始化加载第一页，默认第一页pageSize: 10,      //每页的记录行数（*）pageList: [5, 10, 20, 50, 100], // 可选的每页数据totalField: 'totalPages',dataField: 'content', //后端 json 对应的表格数据 keycolumns: columns,queryParams: function (params) {return {size: params.pageSize,page: params.pageNumber,sortName: params.sortName,sortOrder: params.sortOrder,searchText: params.searchText}},classes: 'table table-responsive full-width',})$(document).on('keydown', function (event) {// 键盘翻页事件var e = event || window.event || arguments.callee.caller.arguments[0];if (e && e.keyCode == 38 || e && e.keyCode == 37) {//上,左// 上一页$('.page-pre').click()}if (e && e.keyCode == 40 || e && e.keyCode == 39) {//下,右// 下一页$('.page-next').click()}})})

后端接口

MeituController

package com.easy.kotlin.controllerimport com.easy.kotlin.chapter11_kotlin_springboot.dao.ImageRepository
import com.easy.kotlin.chapter11_kotlin_springboot.entity.Image
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.data.domain.Page
import org.springframework.data.domain.PageRequest
import org.springframework.data.domain.Sort
import org.springframework.stereotype.Controller
import org.springframework.web.bind.annotation.RequestMapping
import org.springframework.web.bind.annotation.RequestMethod
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.ResponseBody
import org.springframework.web.servlet.ModelAndView/*** Created by jack on 2017/7/22.*/@Controller
class MeituController {@Autowiredvar imageRepository: ImageRepository? = null@RequestMapping(value = "meituJson", method = arrayOf(RequestMethod.GET))@ResponseBodyfun wotuJson(@RequestParam(value = "page", defaultValue = "0") page: Int,@RequestParam(value = "size", defaultValue = "10") size: Int): Page<Image>? {return getPageResult(page, size)}@RequestMapping(value = "meituSearchJson", method = arrayOf(RequestMethod.GET))@ResponseBodyfun wotuSearchJson(@RequestParam(value = "page", defaultValue = "0") page: Int,@RequestParam(value = "size", defaultValue = "10") size: Int,@RequestParam(value = "searchText", defaultValue = "") searchText: String): Page<Image>? {return getPageResult(page, size, searchText)}@RequestMapping(value = "meituSearchFavoriteJson", method = arrayOf(RequestMethod.GET))@ResponseBodyfun wotuSearchFavoriteJson(@RequestParam(value = "page", defaultValue = "0") page: Int,@RequestParam(value = "size", defaultValue = "10") size: Int,@RequestParam(value = "searchText", defaultValue = "") searchText: String): Page<Image>? {return getFavoritePageResult(page, size, searchText)}@RequestMapping(value = "meituView", method = arrayOf(RequestMethod.GET))fun meituView(): ModelAndView {return ModelAndView("meituView")}@RequestMapping(value = "meituFavoriteView", method = arrayOf(RequestMethod.GET))fun meituFavoriteView(): ModelAndView {return ModelAndView("meituFavoriteView")}private fun getPageResult(page: Int, size: Int): Page<Image>? {val sort = Sort(Sort.Direction.DESC, "id")val pageable = PageRequest(page, size, sort)return imageRepository?.findAll(pageable)}private fun getPageResult(page: Int, size: Int, searchText: String): Page<Image>? {val sort = Sort(Sort.Direction.DESC, "id")val pageable = PageRequest(page, size, sort)if (searchText == "") {return imageRepository?.findAll(pageable)} else {return imageRepository?.search(searchText, pageable)}}private fun getFavoritePageResult(page: Int, size: Int, searchText: String): Page<Image>? {val sort = Sort(Sort.Direction.DESC, "id")val pageable = PageRequest(page, size, sort)if (searchText == "") {val allFavorite = imageRepository?.findAllFavorite(pageable)return allFavorite} else {val searchFavorite = imageRepository?.searchFavorite(searchText, pageable)return searchFavorite}}}

ImageRepository

package com.easy.kotlin.chapter11_kotlin_springboot.daoimport com.easy.kotlin.chapter11_kotlin_springboot.entity.Image
import org.springframework.data.domain.Page
import org.springframework.data.domain.Pageable
import org.springframework.data.jpa.repository.Query
import org.springframework.data.repository.PagingAndSortingRepository
import org.springframework.data.repository.query.Param/** Created by jack on 2017/7/17.@Query注解里面的value和nativeQuery=true,意思是使用原生的sql查询语句.
sql模糊查询like语法,我们在写sql的时候是这样写的like '%?%'但是在@Query的value字符串中, 这样写like %?1%*/interface ImageRepository : PagingAndSortingRepository<Image, Long> {@Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.category like %?1%")fun findByCategory(category: String): MutableList<Image>@Query("select count(*) from #{#entityName} a where a.isDeleted=0 and a.url = ?1")fun countByUrl(url: String): Int@Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.category like %:searchText%")fun search(@Param("searchText") searchText: String, pageable: Pageable): Page<Image>@Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1")fun findAllFavorite(pageable: Pageable): Page<Image>@Query("SELECT a from #{#entityName} a where a.isDeleted=0 and a.isFavorite=1 and a.category like %:searchText%")fun searchFavorite(@Param("searchText") searchText: String, pageable: Pageable): Page<Image>}

前台请求第一页的数据, 参数 &page=1&start=0&limit=50

后台得不到数据, 并提示 Page 1 of 1 containing UNKNOWN instances

原因page从0开始不是从1开始

解决方式把page修改为0

...pageNumber: 0,     //初始化加载第一页，默认第一页pageSize: 10,      //每页的记录行数（*）...

完整工程源代码

https://github.com/EasyKotlin/chatper15_net_io_img_crawler

参考连接:

Page 1 of 1 containing UNKNOWN instances when findByUserNameLike(String userName,Pageable pageable)

https://jira.spring.io/browse/DATAJPA-225