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, left        paginationVAlign: 'bottom', //bottom, top, both        paginationDetailHAlign: 'left', //right, left        paginationPreText: ' 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 key        columns: 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.ImageRepositoryimport com.easy.kotlin.chapter11_kotlin_springboot.entity.Imageimport org.springframework.beans.factory.annotation.Autowiredimport org.springframework.data.domain.Pageimport org.springframework.data.domain.PageRequestimport org.springframework.data.domain.Sortimport org.springframework.stereotype.Controllerimport org.springframework.web.bind.annotation.RequestMappingimport org.springframework.web.bind.annotation.RequestMethodimport org.springframework.web.bind.annotation.RequestParamimport org.springframework.web.bind.annotation.ResponseBodyimport org.springframework.web.servlet.ModelAndView/** * Created by jack on 2017/7/22. */@Controllerclass MeituController {    @Autowired    var imageRepository: ImageRepository? = null    @RequestMapping(value = "meituJson", method = arrayOf(RequestMethod.GET))    @ResponseBody    fun 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))    @ResponseBody    fun 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))    @ResponseBody    fun 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.Imageimport org.springframework.data.domain.Pageimport org.springframework.data.domain.Pageableimport org.springframework.data.jpa.repository.Queryimport org.springframework.data.repository.PagingAndSortingRepositoryimport 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