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Technical Articles

Java

SmallRye Mutiny Subscribe to unresponsive solutions when processing events asynchronously

This article aims to address the issue where subscribers cannot receive events when using SmallRye Mutiny for asynchronous event processing. By analyzing the backpressure mechanism of Reactive Streams, we provide manual request data and a simpler API solution using SmallRye, helping developers to correctly handle asynchronous event streams.

Aug 17, 2025 pm 02:15 PM

Spring Boot doctor-patient relationship management system: flexible data model and permission design

This article explores the core challenges of building a doctor-patient relationship management system in Spring Boot, including complex user roles (doctors and patients), many-to-many relationships, and role-based security authentication and authorization. By analyzing two common data model solutions, the article recommends a hybrid design combining common user entities with specific role entities and elaborates on implementation details, including entity relationship mapping, code examples, and Spring Security integration strategies, aiming to provide a flexible and scalable solution.

Aug 17, 2025 pm 02:09 PM

How to effectively handle exceptions and ensure program continuity in Java Socket programming

In Java network programming, handling Socket exceptions is the key to ensuring the stable operation of the program. This article explores the causes of SocketException, StreamCorruptedException and ClassCastException common when using ObjectInputStream/OutputStream in TCP connections, pointing out their limitations in continuous data flows, such as high overhead and fragility in data integrity. The article emphasizes the inherent unreliability of network communication and recommends a more robust data transmission scheme, such as text-based BufferedReader/BufferedWriter or structured data grid

Aug 17, 2025 pm 02:06 PM

Share variables across Scenario in Cucumber: Methods and Best Practices

This article explores the approach to sharing variables across different Scenarios in Cucumber tests and highlights best practices. Although data passing across Scenario can be achieved through global variables, it is recommended to use Background to manage test dependencies to ensure Scenario's independence and maintainability. This article will introduce these two methods in detail and analyze their respective advantages and disadvantages.

Aug 17, 2025 pm 02:00 PM

Use Selenium and Java to scroll the page to load a specified number of elements

This article aims to guide developers on how to use Selenium and Java to automate scrolling web pages until a specified number of elements are loaded. Web pages that dynamically load content can be effectively processed by scrolling the bottom of the page and checking the number of elements. This article provides detailed code examples and notes to help you achieve this goal.

Aug 17, 2025 pm 01:42 PM

How to elegantly implement the button after the ProgressBar is loaded

This tutorial is designed to guide Android developers how to implement a common UI interaction mode in an application: When the ProgressBar completes its loading task, the previously disabled buttons are automatically enabled. The article will elaborate on the complete steps of configuring ProgressBar through XML, utilizing Java code (such as CountDownTimer) to simulate or monitor loading progress, and dynamically update the status of UI elements when the progress reaches preset values, ensuring that users can only perform the next operation after data or tasks are ready, thereby improving the user experience.

Aug 17, 2025 pm 01:27 PM

Judge right triangles in Java: Efficient use of Pythagorean theorem without modifying the original array

This tutorial explores how to determine whether a triangle is a right triangle in Java, especially when it is impossible to directly remove array elements. We will introduce an efficient method without modifying the original edge length array. By identifying the longest edge as a potential oblique edge, and cleverly traverse the array, accumulating the sum of squares of the remaining two sides, and finally comparing with the squares of the longest edge, complex data structure operations are avoided and concise and accurate judgment is achieved.

Aug 17, 2025 pm 01:24 PM

Analysis and solution of data inconsistency in ConcurrentHashMap in concurrent environment

This article aims to solve the problem of data inconsistent when using ConcurrentHashMap in concurrent environments due to the simultaneous writing of multiple threads. By analyzing the cause of the problem and providing a solution to ensure that all threads have completed execution and then check the Map size, helping developers avoid such concurrency problems and ensure data accuracy.

Aug 17, 2025 pm 01:12 PM

SpringBoot application startup failed: Port 8080 has been occupied Solution

This article provides detailed troubleshooting and resolution steps for common "Web server failed to start. Port 8080 was already in use." errors when starting Spring Boot projects. By using the netstat (Windows) or lsof (Unix/Linux/Mac) commands, processes that occupy port 8080 can be quickly located and actions such as stopping the process or configuring the Spring Boot application to use other ports to resolve startup failures.

Aug 17, 2025 pm 01:09 PM

Efficient comparison of two string lists in Java: from linear search optimization to collection operations

This article aims to guide readers how to efficiently compare two ArrayLists to determine whether all elements in one list exist in another. We will start with the basic linear search method, analyze its limitations, and then introduce and recommend a search strategy optimized using HashSet to significantly improve comparison efficiency. In addition, the tutorial will cover how to correctly handle user dynamic input and provide complete code examples and practical considerations.

Aug 17, 2025 pm 12:51 PM

What is the significance of the public static void main(String[] args) method in Java?

public: Ensure that the JVM can access the method from the outside; 2.static: Make the method belongs to a class rather than an instance, and can be called without creating an object; 3.void: means that the method does not return any value; 4.main: is the fixed entry method name recognized by the JVM; 5.String[]args: is used to receive command line parameters, so that the program has the flexibility of external input. Therefore, publicstaticvoidmain(String[]args) is a necessary entry point for Java applications. The JVM relies on its standard signature to start the program. The lack or error definition will cause a "Mainmethodnotfound" error and the program cannot run.

Aug 17, 2025 pm 12:35 PM

java main method

Spark: Remove columns from beans before partition writing

This article describes how to flexibly remove unwanted columns from Java Beans when using Spark for data partition writing to avoid errors caused by data source format limitations. By using the select operation before writing, you can dynamically select the required columns, thereby achieving flexible processing of different partition combinations and avoiding the creation of multiple bean classes.

Aug 17, 2025 pm 12:33 PM

Optimizing nested loops with HashMap: Java object list conversion

This article aims to explain how to optimize the performance of nested loops in Java using HashMap, especially when it comes to comparing properties of two object lists. By converting a list to a HashMap, it can significantly reduce time complexity and improve code execution efficiency. This article will provide detailed steps and code examples to help readers understand and apply this optimization technique.

Aug 17, 2025 pm 12:30 PM

Strategies and practices for efficiently and concurrently executing a large number of Linux commands in Java applications

This article explores strategies for efficiently and concurrently executing a large number of Linux commands such as socat in Java applications. The core is to use ProcessBuilder and thread pool to manage concurrent processes, and avoid I/O blocking by asynchronously processing or redirecting output streams. The article emphasizes that it is feasible to successfully run thousands of lightweight, long-lifetime commands, and the key lies in optimizing resource management and output processing, rather than the number of commands itself.

Aug 17, 2025 pm 12:24 PM