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Technical Articles

Java

javaTutorial

Tutorial on handling transitive dependency version conflicts in Gradle project

This tutorial aims to solve the problem of introducing old version libraries in Gradle multi-module projects, resulting in conflict with the expected version due to transitive dependencies. We will explore how to locate conflict sources, leverage Gradle's dependency management mechanisms (especially the spring-dependent-management plug-in), and native parsing strategies to force a version specified or precisely exclude unwanted dependencies, ensuring that the project only uses the required library versions and avoid potential runtime issues.

Sep 03, 2025 am 11:21 AM

Policies and practices for configuring relative font paths in Apache FOP fop.xconf

When Apache FOP configures fonts in a multi-platform environment, it often faces the problem of relative path resolution, especially in older versions where setFontBaseURL() cannot be used. This article will introduce in detail how to use tags combined with relative embed-url in fop.xconf to achieve flexible references of font files and ensure that PDF generation remains consistent on different operating systems.

Sep 03, 2025 am 11:03 AM

OptaPlanner overconstraint planning: In-depth understanding of virtual value and null value processing strategies

This article explores two core strategies for dealing with overconstrained planning in OptaPlanner: using dummy values ??and setting planning variables to nullable. The article explains in detail the concept of virtual values ??and its application in scenarios where resources are insufficient but the requirements must be met. It compares the differences between the two methods in business objectives, constraint processing logic and applicable scenarios, aiming to guide developers to choose the most appropriate overconstraint solution based on actual business needs.

Sep 03, 2025 am 10:57 AM

Conversion of ZULU timestamp to European/Paris time zone and daylight saving time processing in Java

This tutorial details how to accurately convert ZULU (UTC) timestamps to a specific time zone (such as Europe/Paris), using the java.time API provided by Java 8 and later, and automatically handle daylight saving time (DST). With OffsetDateTime and ZonedDateTime, simple, reliable and thread-safe time zone conversion can be achieved, avoiding common problems with traditional date-time APIs.

Sep 03, 2025 am 10:51 AM

Struts 2 Integration with AJAX: Best Practices for Solving JSON Response Parsing Errors

This tutorial is designed to solve the problem that JSON response causes front-end parsing errors when Struts 2 is integrated with AJAX. The core is to understand the working mechanism of the Struts 2 JSON plug-in, that is, to generate JSON data by serializing the public properties of the Action, rather than manually writing the response stream. The article will elaborate on the correct Action class design, Struts configuration and AJAX calling methods to ensure that the JSON data can be correctly parsed by the front-end.

Sep 03, 2025 am 10:42 AM

In-depth analysis of the precision and monotonicity of Java Math.cbrt function

This article deeply explores the accuracy guarantee and monotonic characteristics of the Java Math.cbrt (cube root) function. Although the official documentation only promises "1 ULP" accuracy and does not explicitly mention semi-monotonicity, its underlying implementation generally provides better accuracy. Through comparative analysis and actual code examples, the article reveals non-strict monotonic or even non-monotonic behaviors that may occur in different cbrt implementations, and explores the potential impact of these characteristics on numerical calculations.

Sep 03, 2025 am 10:27 AM

Java complex multi-condition sorting: combination of type priority and alphabetical order implementation

This article aims to dive into how complex multi-conditional sorting can be implemented in Java, especially when sorting rules involve custom type priorities (such as "artist" taking precedence over "producer") and secondary alphabetical order. We will handle type priority through enumeration and Map, and combine the Comparator.thenComparing() method to provide clear code examples and best practices to help developers build robust and easy-to-maintain sorting logic.

Sep 03, 2025 am 10:09 AM

JPA native query: dynamically obtain records updated within N minutes

This tutorial details how to dynamically parameterize the time interval to get records updated within a specified N minutes in JPA native query. In response to the problem of invalid parameters directly in INTERVAL expressions, the article provides a solution to implement dynamic time filtering through multiplication operations, and emphasizes the importance of using native queries and correct parameter types.

Sep 03, 2025 am 10:06 AM

Java 9: ??Efficient statistics and comparison of substring occurrences using regular expressions (no explicit loop)

This tutorial explores how to efficiently count the occurrences of two specific substrings in a string without using an explicit loop (such as for or while) in Java and compare whether they are equal. The core method is to use the results().count() function of java.util.regex.Matcher in Java 9 and later, and combine the Stream API to achieve a simple and powerful solution.

Sep 03, 2025 am 10:00 AM

Title: Implementing general enumeration type verification in Spring Boot

Abstract: This article describes how to implement common enumeration type verification using custom annotations in Spring Boot projects. By combining the Java reflection mechanism, a flexible verification annotation can be created that can receive enumeration types as parameters, thereby enabling validation of input values ??for different enumeration types. The article provides detailed code examples to help developers quickly master the implementation methods of general enumeration verification and improve the maintainability and scalability of their code.

Sep 03, 2025 am 09:57 AM

Tutorial on efficiently replacing text in Java

This article aims to provide a method to efficiently and concisely replace text after a specific keyword in Java. By using the String.replaceFirst() method combined with regular expressions, developers can easily implement requirements such as "replace what is behind 'IKAR'", avoiding verbose code and complex logic, thereby improving the readability and maintenance of the code.

Sep 03, 2025 am 09:48 AM

Detailed explanation of the Selenium page loading blank retry mechanism

This article aims to provide a common Selenium page loading blank retry mechanism to avoid page loading failures caused by unstable network environment or slow server response. Dynamic functions combine page loading strategies and document.readyState status check to automatically refresh the page and retry loading, thereby improving the stability and reliability of automated tests.

Sep 03, 2025 am 09:42 AM

Methods for combining and finding the highest average row and column of two-dimensional array in Java

This article explains in detail how to merge and find rows and columns with the highest average in Java. By introducing custom data structures (such as Java Record) to solve the problem of returning multiple values, and optimize the calculation logic of row and column averages, we finally implement an efficient and well-structured single method that can return the index of the highest average row and column and can be formatted as specified string output.

Sep 03, 2025 am 09:39 AM

General method of merging JSON arrays based on shared ID in Java

This tutorial details how to use the org.json library in Java to merge JSONObjects in multiple JSONArrays based on shared id fields. By building an intermediate map, we intelligently integrate data from different sources into a new JSONArray while ensuring that the final output does not contain id fields, providing an efficient and flexible solution for data integration.

Sep 03, 2025 am 09:15 AM