pojo | 易学教程

How to create POJO class with only empty constructor in Scala?

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问题 I want to create POJO class in Scala with only default empty constructor. In java, it's like this: public class Foo { private String name; private String address; ... //and the public getter/setter below... } In scala, I have seen that you can create POJO like this: case class Foo(var name: String, var address: String, ...) But in my case, the class will have many properties (around 50+), and I don't think instantiating the class with 50 constructor parameters is fit for this case. UPDATE:

How to skip wrapper object in jackson json deserialization

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问题 I am trying to deserialize the following string using the jackson. { "roomName": "u8ec29p0j7q2m9f", "broadcastPresenceRoles": { "broadcastPresenceRole": [ "moderator", "participant", "visitor" ] }, "owners": { "owner": "anewuser@shahanshah" }, "admins": { "admin": "sanjeet@shahanshah" }, "members": null, "outcasts": { "outcast": [ "sawan@shahanshah", "sus@shahanshah" ] }, "ownerGroups": { "ownerGroup": "Friends" } } This the response from the openfire rest apis. I am having problem with the

How to convert all keys in JSON response to uppercase? (JAVA)

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问题 For example I have the following json response : { StaTuS:succees, LanGuaGes: { Key1: English, key2: Spanish, kEy3: Indian } } The response can have many nested elements. I want to know how we can code in such a way that all the keys can be converted to uppercase in my response so that it matches the naming convention I used in my POJO class. Like this : { STATUS:succees, LANGUAGES: { KEY1: English, KEY2: Spanish, KEY3: Indian } } 回答1: You can use a custom PropertyNamingStrategy: public class

How to add POJO to Spring context to enable injecting dependencies?

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问题 I have a class that would otherwise be a very generic POJO but I would like to inject a dependency in it because I would like to avoid passing that dependency as a (constructor) parameter: //no managed context annotation because it's a simple POJO public class QueuedBatch { //however, I would like to inject the context managed bean below @Autowired AsyncActionQueue asyncActionQueue; Currently, no exception is thrown at deploy time but asyncActionQueue is null at runtime so I get a NullPointer

Gson: [Class] declares multiple JSON fields named [property]

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问题 I'm trying to serialize the following POJO to JSON using Gson: public class Member { private long id; private long customerAccountNumber; private long memberNumber; private String title; private String initials; private String telephoneNumber; private String maritalStatus; private String firstName; private String surname; private Date birthDate; private Date joinDate; private String gender; private String language; private String idNumber; private String passportNumber; private String

JMX和MBean以及pojo-mbean学习

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 最近在看一个开源的Cache框架，里面提到使用JMX来查看Cache的命中率以及响应时间等，于是翻了一些JMX的文章，整理了一下。问题：什么是JMX？问题：JMX的架构是什么样子的？问题：JMX以及Mbean中的概念都有那些？问题：如何编写一个简单的Standard MBean？问题：如何编写一个DynamicMBean? 问题：Open MBean 和Mode MBean是作用是啥？问题：按照MBean的规范写，是不是有点繁琐，有没有简单点的办法？问题：什么是JMX？ JMX(java management extensions)java管理程序扩展，是一个为应用程序、设备、系统等植入管理功能的框架。 JMX使用了最简单的一类javaBean，使用有名的MBean，其内部包含了数据信息，这些信息可能是程序配置信息、模块信息、系统信息、统计信息等。MBean可以操作可读可写的属性、直接操作某些函数。问题：JMX的架构是什么样子的？问题：JMX使用三层架构，各个层的详细描述是怎么样的？ Probe Level负责资源的检测（获取信息），包含MBeans，通常也叫做Instrumentation Level。 The Agent Level 或者叫做MBean Server，是JMX的核心

What constitutes a rich domain model in a POJO/POCO?

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问题 What is the difference between A simple fields-accesors-mutators class A rich-modeled class What constitutes rich modeling in business-domain classes? 回答1: "Rich" as used here implies "rich behavior" (as opposed to state). There is technical behavior and domain behavior. Accessors and mutators are technical; they lack the "why" which defines business interest. Domain objects represent the "why" and encapsulate the "how". Actually, all objects do that; domain objects do it specifically for

Hibernate generate POJOs with Equals

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问题 We are using hibernate in a new project where we use the hibernate.reveng.xml to create our *.hbm.xml files and POJOs after that. We want to have equals methods in each of our POJOs. I found that you can use <meta attribute="use-in-equals">true</meta> in your hbm files to mark which properties to use in the equals. But this would mean editing alot of files, and then re-editing the files again in the future if/when we modify tables or columns in our DB. So I was wondering if there is a way to

primefaces autocomplete with pojo

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问题 I read on SO some QA about the same component, but I feel I'm missing something, because I am one step behind. I can't even make the page open when using the primefaces autocomplete component in it. The snippet for it is: <p:autoComplete value="#{indirizzoCtrl.selectedCodiceNazione}" completeMethod="#{indirizzoCtrl.completeNazione}" var="nazione" itemLabel="#{nazione.nome}" itemValue="#{nazione.codiceNazione}" /> Nazione is a Pojo class where CodiceNazione and Nome are two String field (with

Convert JSON into POJO (Object) similar to android in Flutter

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问题 I'm just trying to find a way to convert a json response (from a REST API) into POJO (As used in android) so that I can use the received data into my application as using Map wont be sufficient as the data i'm receiving is a little complex and contains 3 levels of arrays (arrays inside of arrays inside of arrays). I'm using Dio library for api calls and i can make API call successfully and print the data on the console with no issues at all. Can anyone assist me in achieving this? Below is