Article Tags
Article Tags
Spring MongoDB implements deduplication query and returns the correct aggregation writing method of multi-field DTO
This article explains in detail how to efficiently obtain deduplicated organization information (organizationId organizationName) through the aggregation pipeline (Aggregation) in Spring Data MongoDB, avoid the limitations of findDistinct(), and solve the problem of DTO mapping to empty objects due to mismatched grouping structures.
Mar 31, 2026 am 01:18 AM
Title: Hierarchical Map structure using recursion to build nested string paths in Java
This article describes how to parse a dot-delimited string (such as "caso.responsavel.dadosPessoais.nome") into a deeply nested Map hierarchy, and achieve a tree-like grouping effect through recursive filling and formatted printing.
Mar 31, 2026 am 01:15 AM
Use GitHub CLI to efficiently publish local projects to GitHub
This tutorial will guide you on how to use the GitHub CLI to quickly upload and publish locally completed projects (such as JetBrains Academy projects) to GitHub without IDE integration. By installing CLI, authentication and a simple gh repo create command, you can efficiently create remote repositories and synchronize local code to achieve project version control and sharing.
Mar 31, 2026 am 01:06 AM
Should PageFactory be used in Selenium page object pattern?
This article explores whether using PageFactory is recommended in modern Selenium test development (especially Kotlin environments), analyzes its design intent, practical limitations, and provides more robust, type-safe alternative practices.
Mar 31, 2026 am 12:57 AM
Range query solution for string type date field in MySQL
This article describes how to use JPA to customize native SQL to implement efficient and accurate date range queries and avoid SimpleDateFormat parsing errors and type mismatch problems on the premise that the date field in the MySQL table is VARCHAR (such as '1/11/2020 17:18') and the table structure cannot be modified.
Mar 31, 2026 am 12:54 AM
Use Java JDBC to back up and restore specified tables (including structure and data) in HSQLDB
This article explains in detail how to call HSQLDB's built-in SQL commands through Java JDBC to accurately back up and restore specified tables (including DDL structures and complete data), avoid exporting the entire database, and meet the needs of refined data migration and testing scenarios.
Mar 30, 2026 am 07:15 AM
An in-depth analysis of the challenges and solutions for reflectively modifying private static Final fields in Java 17
Java 17 has enhanced the encapsulation of internal APIs, causing NoSuchFieldException to be encountered when modifying final static fields using traditional reflection methods. This article elaborates on the cause of the problem and provides a solution to access the internal modifiers field through a deeper reflection mechanism in the Java 17 environment. It also emphasizes the necessary JVM startup parameter configuration and reflection operation considerations.
Mar 30, 2026 am 07:06 AM
How to automatically compare DTO and Entity field differences (missing/redundant fields) through reflection
This article introduces a general solution based on Java reflection, which is used to automatically identify missing (Entity has but DTO does not) and redundant fields (DTO has but Entity has no) fields between DTO and corresponding Entity, and supports type checking and mapping relationship expansion.
Mar 30, 2026 am 06:51 AM
Spring Boot REST Controller Unit Testing: A Practical Guide Based on MockMvc
This article dives into best practices for Spring Boot REST controller unit testing, focusing on how to use MockMvc to simulate HTTP requests and verify API responses. The article will cover test environment setup, POST request parameter passing, response assertions, and common dependency simulation strategies, aiming to help developers write robust and maintainable controller test cases and avoid common test configuration errors.
Mar 30, 2026 am 06:45 AM
XStream security practices: How to effectively prevent deserialization untrusted data vulnerabilities
This article aims to address the "Deserializing Untrusted Data" security vulnerability reported by static analysis tools such as Checkmarx when using XStream for XML deserialization. The core is that XStream allows deserialization of any type by default, leading to potential risks. The tutorial will introduce in detail how to limit deserializable classes through the type whitelist mechanism (addPermission and allowTypes), thereby effectively enhancing the security of the application and avoiding malicious code execution or data leakage.
Mar 30, 2026 am 06:15 AM
How to standardize and beautify Java code in Selenium tests
This article discusses the readability and style specifications of Java code in Selenium automated testing, focusing on the analysis of reasonable line wrapping strategies for method chain calls, applicable scenarios and team collaboration suggestions to help improve the maintainability and understandability of test code.
Mar 30, 2026 am 06:09 AM
How to dynamically create an instance of an interface implementation class in a generic method
This article explains why objects cannot be constructed directly from the generic type parameter T and provides a safe, type-safe and Java runtime-compliant solution based on Supplier.
Mar 30, 2026 am 06:03 AM
Complete tutorial on converting JSON array to List using Jackson in Java
This article explains in detail how to use the Jackson library to deserialize a JSON string array into a List safely and efficiently, focusing on solving TypeReference type reference errors and camel case naming mapping issues, and provides runnable examples and key precautions.
Mar 30, 2026 am 05:51 AM
Java Unit Testing Practice: Coping with the Challenges of System.in Interactive Input
This article details how to handle relying on System.in for user interaction in Java unit tests. By redirecting the standard input stream System.in to ByteArrayInputStream, we can simulate user input and capture standard output in combination with ByteArrayOutputStream, thereby realizing automated testing of interactive logic, effectively solving test blocking problems and ensuring code quality.
Mar 30, 2026 am 05:45 AM
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