Article Tags
Article Tags
Kafka consumer batch control: optimize poll() behavior based on byte size
In the Kafka consumer, if you need to limit the message batch pulled by a single poll() operation based on the total byte size of the message rather than the number of records, you should first configure FETCH_MAX_BYTES_CONFIG. This parameter directly affects the underlying data capture behavior. Together with setting MAX_POLL_RECORDS_CONFIG to a large enough value, byte-based batch control can be effectively implemented, thereby optimizing consumer performance and resource utilization.
Dec 01, 2025 pm 01:09 PM
Jackson XML serialization: how to force output of XML declaration
This article aims to solve the problem that declarations are not included by default when using Jackson XmlMapper to generate XML. By configuring ToXmlGenerator.Feature.WRITE_XML_DECLARATION to true, developers can ensure that the generated XML document contains a complete declaration header to meet the requirements of a specific specification or parser and ensure the output XML format specification.
Dec 01, 2025 pm 01:06 PM
Spring Boot service: securely expose internal API through independent management port
This article details how to use built-in configuration to isolate internal management APIs (such as Actuator endpoints) from public business APIs in Spring Boot applications. By configuring independent management ports and precisely controlling exposed endpoints, service security can be effectively enhanced to ensure that only authorized internal systems can access monitoring and management functions, while public traffic is completely isolated from the main service port, avoiding additional proxy layer configuration.
Dec 01, 2025 pm 12:51 PM
Java 8 Streams: Implementing multi-condition filtering, grouping by month and counting statistics
This article explains in detail how to use the Java 8 Streams API to efficiently handle complex data aggregation requirements, including multi-condition filtering, grouping by date and month, and counting statistics for specific event types (such as JOIN/EXIT). By building custom grouping keys and chained Stream operations, the conversion from original data structures to structured statistical results is achieved, and complete code examples and key step analysis are provided.
Dec 01, 2025 pm 12:42 PM
In-depth understanding of the NIO non-blocking mechanism of Apache HttpAsyncClient
Apache HttpAsyncClient utilizes Java NIO's Selector mechanism and internal thread pool to implement non-blocking HTTP request processing for user threads. It efficiently waits for I/O events by multiplexing multiple sockets in internal threads, ensuring that users can perform other tasks without waiting after initiating a request, thereby significantly improving the application's responsiveness and resource utilization. It is a key component in building highly concurrent and scalable network applications.
Dec 01, 2025 pm 12:33 PM
How to test internally caught exceptions
This article takes an in-depth look at how to handle and verify internally caught exceptions in unit tests. When an exception is thrown inside a method but is subsequently caught and handled (e.g. just logged) by a try-catch block, the traditional assertThrows mechanism cannot be directly verified. The article analyzes the testing challenges brought by this design pattern and provides two main solutions: the first is to recommend refactoring the code to improve testability, such as using Optional or custom result objects to clearly indicate the results of the operation; the second is to explore strategies for indirectly testing exception handling logic by verifying log output or utilizing the fail() method for existing code that cannot be refactored immediately.
Dec 01, 2025 am 11:57 AM
Java Swing: JTable data summed and displayed in JTextField
This document is intended to guide developers on how to obtain price data from JTable, calculate the sum, and display the results in the JTextField component in a book management project built with Java Swing. We will explain the code implementation in detail and provide precautions to ensure that readers can successfully complete function development.
Dec 01, 2025 am 11:54 AM
Analysis of programmatic control limitations of Android system modes (such as airplane mode)
For security and user privacy reasons, the Android system strictly restricts third-party applications from directly programmatically changing core system modes such as airplane mode, Wi-Fi, and GPS. The application can only guide users to manual operations through intent (Intent), but cannot directly switch. This design is intended to protect system stability and prevent malicious behavior.
Dec 01, 2025 am 11:39 AM
Implementation and security practice of Spring Boot password modification API
This article aims to guide readers to correctly implement the password modification function in Spring Boot applications, focusing on solving common logic errors, especially the pitfalls of String and Boolean type comparison, and emphasizing the importance of password hashing and salting. Ensure the security, robustness, and maintainability of password changing functionality with sample code and best practices.
Dec 01, 2025 am 11:30 AM
Java 8 Stream API: Efficiently iterate over arrays and solve the 'sum of two numbers' problem
This tutorial explores how to use the Java 8 Stream API combined with the Set data structure to efficiently solve the problem of finding two numbers whose sum is a specific target value in an integer list. The article will start from the traditional O(n^2) nested loop method, gradually optimize it to the Set-based O(n) iteration scheme, and finally show how to elegantly convert it into a concise and powerful Stream API implementation, including multiple forms with log output and only returning results.
Dec 01, 2025 am 11:00 AM
JavaFX application packaging and SQLite database integration: Tutorial using jpackage
This article details how to use the jpackage tool to create native installation packages for JavaFX applications and seamlessly integrate SQLite databases. Unlike traditional JAR file export, jpackage can package all dependencies (including JavaFX runtime and SQLite database files) into a platform-specific installation program, thereby solving the problem of database connection failure after exporting the JAR package and ensuring stable operation and resource access of the application in the desktop environment.
Dec 01, 2025 am 10:57 AM
How to dynamically insert unknown number of vertices in Gremlin-Java
This article explores ways to dynamically build queries in Gremlin-Java to insert an unknown number of vertices. We'll cover two main backend-agnostic strategies: building Gremlin traversals iteratively and leveraging inject().unfold() for batch data processing. Additionally, the mergeV() step introduced in TinkerPop 3.6 will be briefly mentioned, providing modern solutions for performing more efficient upsert operations and emphasizing the importance of choosing an appropriate method in practical applications.
Dec 01, 2025 am 10:00 AM
Verification and elegant error handling of enumeration parameters generated by OpenAPI in Spring Boot
This article aims to solve the problem in Spring Boot applications that the enumeration type parameters generated by OpenAPI Generator cannot automatically verify the validity in API requests. By introducing custom type converters and global exception handlers, we can ensure strict verification of incoming enumeration values and return clear and friendly error messages when verification fails, thus improving the robustness and user experience of the API.
Dec 01, 2025 am 09:03 AM
Guide to unit testing POST requests using Mockito and Dio in Flutter
This article details how to use Mockito and Dio libraries to unit test POST requests (especially login authentication scenarios) in Flutter applications. The content covers the implementation of Dio requests, Mockito simulation skills, and how to construct simulated responses to verify business logic and ensure code quality and maintainability.
Dec 01, 2025 am 08:57 AM
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