转：spring data rest interceptor

问题： spring boot + spring data rest 项目中采用下面这种方式注册了 inte… Read More

Selenuim 、 PhantomJS 、puppeteer 更好的替代品

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JPA n次查询问题优化

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问题： Entity Car 有两类Entity BigCar 及Entity SmallCar；数据库中对… Read More

JPA Resolved [java.lang.IllegalArgumentException: Id must be assignable to Serializable: null]

问题： JPA Entity 如下

@Table (name= "EMP") 
@Inheritance
@DiscriminatorColumn (name="EMP TPE") 
public abstract class Employee {...}

@Entity
@DiscriminatorValue ("CEmp")
public class contractemployee extenas Employee{...}

@MappedSuperclass
public abstract class CompanyEmployee extends Employee {...}

@Entity
@DiscriminatorValue ("FTEmp")
public class FullTimeEmployee extenas companyemployee {....}

@Entity (name= "PTEmp")
public class PartTimeEmployee extends CompanyEmployee {....}

@Table (name= "EMP")

@Inheritance

@DiscriminatorColumn (name="EMP TPE")

public abstract class Employee {...}

@Entity

@DiscriminatorValue ("CEmp")

public class contractemployee extenas Employee{...}

@MappedSuperclass

public abstract class CompanyEmployee extends Employee {...}

@Entity

@DiscriminatorValue ("FTEmp")

public class FullTimeEmployee extenas companyemployee {....}

@Entity (name= "PTEmp")

public class PartTimeEmployee extends CompanyEmployee {....}

&nbs… Read More

SpringBoot Caused by: com.mysql.cj.exceptions.ConnectionIsClosedException: No operations allowed after connection closed.

问题： spring boot + hikari + mysql [crayon-67ef3a39155065… Read More

转：SpringBoot HikariCP配置项及源码解析

https://www.jb51.net/article/274116.htm 目… Read More

Spring Data REST 使用入门

问题：解决：创建好数据库及表在 spring boot 项目 pom.xml… Read More

2023年如何快速创建 JavaFX Maven 项目

问题： JavaFX 从 JDK8+ 剥离后，要创建 JavaFX 项目有点乱 … Read More

【未解决】aliyun oss 通过 x-oss-ac-source-ip 限制 ip 下载文件

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IT问题

程序员的疑难杂症录

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