无法构造'com.baomidou.mybatisplus.core.metadata.ipage'的实例

[目录]

参考

通过feignClient调用微服务提供的分页对象IPage<T>报错

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问题描述

错误提示

通过 FeignClient 调用微服务提供的分页对象 IPage<T> 报错

{
    "timestamp": "2019-08-15T08:25:03.323+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "Type definition error: [simple type, class com.baomidou.mybatisplus.core.metadata.IPage]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.baomidou.mybatisplus.core.metadata.IPage` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information\n at [Source: (PushbackInputStream); line: 1, column: 37] (through reference chain: com.test.invoice.vo.ResponseVO[\"data\"])",
    "path": "/enta/api/Inv/Api/Test/Query"
}

相关代码

1.生产者

@Override
public ResponseVO<IPage<TRbtTestData>> Query(@RequestBody SuperEntity param){
    Page<TRbtTestData> page = new Page<>();
    page.setCurrent(1);
    page.setSize(10);
    return new ResponseVO<>(ResponseCode.OK, baseMapper.selectPageVO(page, param));
    IPage<TRbtTestData> ipageData = baseMapper.selectPageVO(page, param);
}

2.Feign-api接口定义

@FeignClient(value = "service-producer")
public interface TRbtTestConsumer {
    @PostMapping("/Test/Add")
    ResponseVO<String> Add(@RequestBody TRbtTestData data);
    @PostMapping("Test/Update")
    ResponseVO<Boolean> Update(@RequestBody TRbtTestData data);
    @RequestMapping(value="Test/Del",method=RequestMethod.GET)
    ResponseVO<Boolean> Del(@RequestParam(value="name",required = true) String name,@RequestParam(value="version",required = true) String version);
    @PostMapping("/Test/Get")
    ResponseVO<TRbtTestData> Get(@RequestBody TRbtTestData data);
    @PostMapping("/Test/Query")
    ResponseVO<IPage<TRbtTestData>> Query(@RequestBody SuperEntity param);
}

3.消费者，Feign-api 调用

@PostMapping("/Test/Query")
@ApiOperation(value = "系统框架测试-获取分页数据", httpMethod = "POST", response = ResponseVO.class, notes = "系统框架测试-获取分页数据")
public ResponseVO Query(@RequestBody SuperEntity param){
    return testConsumer.Query(param);
}

原因分析

当前 mybatis-plus 版本不支持 IPage，使用 Page 即可

问题解决

1.生产者

@Override
public ResponseVO<Page<TRbtTestData>> Query(@RequestBody SuperEntity param){
    Page<TRbtTestData> page = new Page<>();
    page.setCurrent(1);
    page.setSize(10);
    //return new ResponseVO<>(ResponseCode.OK, baseMapper.selectPageVO(page, param));
    IPage<TRbtTestData> ipageData = baseMapper.selectPageVO(page, param);
    //IPage<TRbtTestData> 转换为 Page<TRbtTestData>
    Page<TRbtTestData> pageData = new Page<>();
    pageData.setRecords(ipageData.getRecords());
    pageData.setCurrent(ipageData.getCurrent());
    pageData.setSize(ipageData.getSize());
    pageData.setTotal(ipageData.getTotal());
    return new ResponseVO<>(ResponseCode.OK, pageData);
}

2.Feign-api接口定义

@FeignClient(value = "service-producer")
public interface TRbtTestConsumer {
    @PostMapping("/Test/Add")
    ResponseVO<String> Add(@RequestBody TRbtTestData data);
    @PostMapping("Test/Update")
    ResponseVO<Boolean> Update(@RequestBody TRbtTestData data);
    @RequestMapping(value="Test/Del",method=RequestMethod.GET)
    ResponseVO<Boolean> Del(@RequestParam(value="name",required = true) String name,@RequestParam(value="version",required = true) String version);
    @PostMapping("/Test/Get")
    ResponseVO<TRbtTestData> Get(@RequestBody TRbtTestData data);
    @PostMapping("/Test/Query")
    ResponseVO<Page<TRbtTestData>> Query(@RequestBody SuperEntity param);
}

3.消费者，Feign-api 调用

@PostMapping("/Test/Query")
@ApiOperation(value = "系统框架测试-获取分页数据", httpMethod = "POST", response = ResponseVO.class, notes = "系统框架测试-获取分页数据")
public ResponseVO Query(@RequestBody SuperEntity param){
    return testConsumer.Query(param);
}

测试结果