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java - Sending JSON data over post man giving the Failed to evaluate Jackson deserialization for type in Spring Boot Jpa project

Course.java package com.example.jpa_training.JPAD.model; @Entity @Table(name = "COURSE") public class Course implements Serializable ... , I tried many ways but couldn't fix it...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js - How to configure multiple private registries in a single node application

I want to add two modules from different npm registry. For example There is a package named @my-company/package-1 ... for authentication How to configure this in `.npmrc' file...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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有实现直播连麦功能的么？

普通的直播已经完成了，但是现在要在这个基础上加上连麦功能，不知道有实现的朋友没有，从七牛云技术哪里了解到，连麦必须要去创建一个跟直播不一样的房间，创建方式在文档1里，但是这个文档真的很难看懂它的第一步管理凭证是如何创建的，于是又找到文 ... 该怎么做呀，七牛云的文档到底能不能写明白点呀，谁要是从文档1中看到管理凭证是如何创建的，请告诉我一下，让我跪舔一下吧...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mongodb - Mongo db : data uploaded using CSV has Null stored as String in Mongo document

I tried uploading data into Mongodb using CSV from Mongodb Compass. In the CSV, some of the fields have Null values stored ... way to store Null fields from CSV with the type Null?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - What does syntax in example code mean (typescript, react)?

const example: (string: string) => string = string => { return string.split(""); } Its not a detailed question - I know, but ... : => string = string => why not just = string => ?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php中这个mysql语句的语法怎么处理？

php中这个mysql语句的语法怎么处理？如下图所示，问题在红框中：问题：红框中那一串字符有$符号，会被认为是php变量，应该怎么处理？加转义符？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python 中列表怎么分区间统计

list= [ ..., 2648, 2648, 2648, 63370, 63370, 425, 425, 120, 120, 217, 217, 189, 189, 128, 128, 115, 115, 197, 19752, 152, 152, 275, ... 统计长度在 0-50 的频数，50-100 的频数... 我这么写对么，应该怎么写呢?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Can I automatically generate code samples from IDE code templates?

I'm trying to find information (documentation, advice, etc) on how certain IDE templates (e.g. in Eclipse, IntelliJ, ... by IDE community members). Thanks in advance, Marcos C-S...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - React useQuery returns cache data

I'm using react apollo/client useQuery in my code as follows const {data, loading,error} = useQuery(getCustomerCompareList, { ... .How can I solve this to get real data.Please help...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Anjlab not calling onProductPurchased after successful billing java

I use anjlab library to handle billing in my app. I have it in my public class Plus extends BaseActivity implements ... /anjlab/android-inapp-billing-v3 Any ideas what is wrong?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - The difference between else if and else {if}

Code A: if () ... else { if (cond == 1) /* do something */ } Code B: if () ... else if (cond == 1) /* do something */ If there exists differences between code A and Code B?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - How can I calculate internet speed?

I want to calculate internet speed in embedded device. In my researches on the internet, I saw that in order to ... the optimal data size to download from server? Thank you....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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游戏服务器如何防御ACK攻击，是否会有CC攻击出现？

游戏服务器，上面运行的是公司写的一个 Server 端。（问题1）如何防御 ACK 攻击？（问题2）或者说 ACK攻击会不会在服务器能显示的状态中显示出来，然后通过 iptables 封掉来源IP？（问题3）像自己写的这种自己通过 TCP 进行加密通信。会不会受到 CC 攻击？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Copy rows range from Sheet1 to Sheet2 in excel VBA

My excel data is feeding from other real time application source. My requirement is I want to copy range A1:M20 ... not overwritten). Someone help me to do in excel VBA/...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Completely delete Liferay Workspace in eclipse?

I create a Liferay Workspace Project in eClipse. After that, I delete the workspace project in the eClipse. The ... can I completely delete the "Liferay Workspace Project"? Eric...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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iOS如何通过蓝牙向外设发送byte数组

[self.peripheral writeValue:data forCharacteristic:self.writeCharacteristic type:CBCharacteristicWriteWithResponse]; iOS 用蓝牙向外设写数据发送的类型只用data 但是外设只能通过蓝牙接受byte数组。。改怎么办。。。...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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weex-toolkit 安装报错

安装到这步就进行不下去了； ? ~ sudo cnpm install -g weex-toolkit@beta Password: Downloading weex-toolkit to /usr/local/lib/ ... . --registry=https://registry.npm.taobao.org -g weex-toolkit@beta...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - JS: How to remove animations rather than just stopping them?

Is there a way to remove an animation? When I run document.getAnimations(), I see a list of my animations but I ... the Web Animation API but didn't see it in the documentation....

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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就一台服务器，mysql数据库想实现自动备份，如何设计？

要写份脚本吗？是不是再买台服务器...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Fixed size Bootstrap cards in a div

In my Angular application I have this div: My html: <div class="border row col-md-5 d-flex justify-content-center ... my code so my pictures don't expand their respective divs?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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react字符串转换为组件

因为要循环添加某个东西，所以我只能想到通过字符串的方式添加组件，但是通过字符串添加渲染出来的组件就是一长串的字符串，而不是我想要的类似于retrun里的组件，请问有什么办法可以解决这个问题吗？另外，产生这个问题的原因是，我 ... row，再把第五个数据用col包裹起来放到新建的row里，第六个第七个第八个都用col包裹起来，放到第五个数据新建的row那里 ...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Java Compare two Objects containing deeply nested lists, find deleted list items based on attribute on list A and update List B

Given two instances A and B of the same class T with the following sample structure: Class T { Object C; Object D; List<E> listA ... (key)) { compare(value, objO.get(key)); } } } }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Passing the value of button to textbox and update the status. (Codeigniter)

How can I pass the value of my "ACTIVE" status attribute to my textbox? My goal is to update the status of my ... 'msg_class','alert-success'); return redirect('welcome/users'); }...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - GCP Cloud Function to create VM instance does not recognise my custom image

I am trying to create a Cloud Function in Python that builds a VM instance using a custom image I previously ... context): create_instance(service, project_id, zone, "vm-instance")...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Untrusted pickle source

From the python docs for pickle : Warning The pickle module is not secure. Only unpickle data you trust. What would ... example of something malicious that could be done with it?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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pyspark - Get top 10 words from column in spark

date_range = mydata[mydata.headline_category=='india'].sort('publish_date') date_range.show() +--------- ... words in headline_text column for a headline_category category india?...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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node.js 的request-promise模块怎么发送带参数的POST请求啊

var rp = require('request-promise'); var options= { method:'post', uri:"http://192.168.0.37:8084/comments/praise", qs:{id: ... then(function(data){ console.log(data) }); 报错了，麻烦大神看下...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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怎么用js操作这些dom元素

两个问题怎么用js给body下面加一个id为wrapper的div，包在最外层？怎么用js给样式为aa的div外包一个id为wrap的div？...

asked Feb 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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