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Maestro UI test run error NoSuchMethodError Solution

This article provides a solution to the problem that the Maestro UI automation test tool has an error in java.lang.NoSuchMethodError: java.io.InputStream.readAllBytes()[B] in Flutter application test. The core of this solution is to ensure that JDK 11 is installed and configured correctly and remove other versions of JDK that may cause conflict, thereby resolving the dependency problem of Maestro runtime.

Aug 26, 2025 am 11:15 AM

JNA Advanced Tutorial: How to efficiently map C language nested structures and unions

This tutorial explores the mechanism by which JNA performs complex data type mapping between Java and C, especially for scenarios containing nested structures and unions. By analyzing an actual error case, the article elaborates on JNA's strict requirements for Java class inheritance Structure or Union, and provides two core solutions: one is to directly build JNA mapping classes that correspond exactly to the C language definition, and the other is to introduce a "friendly" Java object wrapper layer to optimize code readability and maintenance, aiming to help developers avoid common pitfalls and achieve efficient and stable cross-language calls.

Aug 26, 2025 am 11:12 AM

The collaboration between the Try-Catch block and the For loop: Exception handling and loop control

Article summary: This article explores in-depth the impact of exception handling on loop execution when nesting for loops in a try-catch block. By analyzing the code examples, the different results of placing a try-catch block inside and outside the loop are explained, and a way to effectively handle exceptions in the loop and ensure normal execution of the program is provided. Mastering this technique is essential to writing robust, reliable applications.

Aug 26, 2025 am 11:03 AM

Java conditional statement optimization: improving code readability and simplicity

This article aims to help Java developers optimize complex conditional statements, especially if statements involving multiple conditional judgments. By reversing the conditions and applying DeMorgan's law, we can simplify the otherwise lengthy and difficult-to-understand code into a clearer, more maintainable form. This article will provide detailed steps and examples to help you write more elegant Java code.

Aug 26, 2025 am 11:00 AM

Spring Security OAuth2 Practical Guide to Caching Opacity Token Introspection Request

This article aims to provide a practical tutorial on caching OAuth2 opaque token introspective requests in Spring Security. When the authentication server is unstable, by customizing the OpaqueTokenIntrospector and integrating cache mechanisms such as Ehcache, the number of requests to the authentication server can be effectively reduced, thereby improving the stability and response speed of the resource server, and avoiding 401 errors caused by introspection failure.

Aug 26, 2025 am 10:51 AM

Correct practice of comparing dynamic file selection and string in Java

This article aims to explore common problems encountered in dynamically selecting files in Java, especially the misuse of string comparison (== and equals()) and File.toString() methods. The article will explain in detail how to correctly compare string contents and provide robust dynamic file path construction and verification strategies to ensure that the program can accurately read the expected files.

Aug 26, 2025 am 10:42 AM

Cross-language ZIP compression and decompression: Best practices for Java generation and Go decompression

This article aims to resolve the "zlib: invalid header" error encountered when Go language decompresses data using ZipOutputStream after Java uses ZipOutputStream to compress data. The core problem is that it confuses the ZIP file format with the Zlib compression stream. The article will elaborate on the output characteristics of Java ZipOutputStream in detail, and provide professional solutions for correctly decompressing archive/zip packages in Go language to ensure compatibility and correctness of cross-language data transmission.

Aug 26, 2025 am 10:24 AM

Convert integers into small-endian hexadecimal representation and output formatting in Java

This tutorial details how to convert integers into a hexadecimal representation of Little Endian in Java. The article explains how to handle endianness using ByteBuffer and focuses on solving common symbol extension problems when correctly formatting Java's signed byte types into two-bit hexadecimal strings. Make sure the output is as expected by providing the correct printf formatting skills, such as converting integer 1234 to D2 04.

Aug 26, 2025 am 10:15 AM

Kafka Streams: Group based on keys and create global KTable with value as object list

This document describes how to use Kafka Streams to group data based on keys, such as Scheme, and store the results in a global KTable where the key is a string (Scheme) and a value is a RuleConfig object list. This is demonstrated through sample code, and points out key points to be paid attention to during implementation to ensure that KTable aggregates and stores data correctly.

Aug 26, 2025 am 10:03 AM

ISBN format output tutorial

This article describes how to format a 9-digit string into an ISBN format, such as 9-562-32458-4 or 0-321-57351-X. It is mainly achieved through the String.substring() method and the System.out.printf() method. At the same time, this article also emphasizes the importance of input verification to ensure that the input string length is 9 bits.

Aug 26, 2025 am 10:00 AM

Java console pattern generation: character alternating mode implementation based on user input

This article will introduce in detail how to implement a dynamic character pattern generator in Java. The program prints characters line by line based on the integer value entered by the user. The number of characters per line is the same as the line number, and characters will alternate between " " and "-" according to the parity of the line number. We will build this logic through nested loops and conditional judgments and provide complete Java code examples to help readers master such pattern generation techniques.

Aug 26, 2025 am 09:51 AM

Spring Boot Thymeleaf List Data and Operation Button Correct Integration Practice

This tutorial explains in detail how to efficiently and correctly render HTML tables containing list data in Spring Boot applications, and integrate independent operation buttons (such as deletion) for each row of data. From the backend data model design, controller data preparation, to the iterative rendering and form submission of the front-end Thymeleaf template, the article systematically solves the common loop nesting errors when adding operation buttons to each data in the table, ensuring that each row of data only corresponds to one operation button, which improves the clarity and maintainability of the code.

Aug 26, 2025 am 09:45 AM

Java tutorial: Find elements with the same number in the array

This article aims to describe how to write a method in Java that takes an array of integers as input and returns an array of elements with the same beginning and ending numbers. We will do this by converting numbers into strings and comparing the end characters of the string while avoiding repeated additions of elements.

Aug 26, 2025 am 09:30 AM

Practical Guide to Calculating Date and Time Differences in Java

This article aims to guide Java developers how to calculate the difference between two dates and times and determine whether they meet certain conditions. We will use the java.time package introduced by Java 8, especially the LocalDateTime and Duration classes, to calculate the time difference efficiently and accurately, and provide sample code to demonstrate how to calculate the minute difference between two LocalDateTime objects and compare it with the preset value.

Aug 26, 2025 am 09:24 AM