Article Tags
Article Tags
Maven sub-project independent version management: resolving dependency resolution conflicts
This article aims to solve the problem of build failure caused by dependency resolution errors when sub-projects in Maven multi-module projects require independent versions. The core is to clearly distinguish the sub-project's own version from the parent project version. By explicitly using ${project.parent.version} instead of the default ${project.version} for dependencies from the parent project in the sub-project, you can ensure that dependencies are resolved correctly and achieve independent management of sub-project versions.
Dec 12, 2025 pm 12:09 PM
Android in-app update crash: AppUpdateManager initialization best practices
This article takes an in-depth look at the crash issue caused by improper initialization of `AppUpdateManagerFactory.create(this)` when integrating the Google Play in-app update function in an Android application. The article explains in detail the problems that may arise from directly initializing AppUpdateManager as a class member, and provides strategies and sample code for correctly initializing AppUpdateManager in Activity life cycle methods (such as `onCreate`) to ensure the stability and reliability of the in-app update process.
Dec 12, 2025 am 11:48 AM
Tutorial on implementing a unified countdown timer across time zones in Android applications
This article aims to solve the problem of inconsistent countdown display across time zones in Android applications. By basing all time calculations on Pacific Standard Time (PST), users will see the same countdown time regardless of their time zone, providing a consistent user experience. We will provide detailed code examples and steps to help developers implement this feature.
Dec 12, 2025 am 11:27 AM
How to dynamically inject Body ID in Java Pact contract
This article details how to dynamically inject the ID in the request body when using Pact for contract testing in Java.通过结合Pact Provider的@State注解和Consumer端PactDslJsonBody的valueFromProviderState方法，实现了在测试前创建数据并将其动态ID传递给Consumer契约，确保契约测试的灵活性和真实性，避免硬编码ID带来的问题。
Dec 12, 2025 am 11:24 AM
Variation of the 0/1 knapsack problem: Maximizing item collection strategy under budget constraints
This article dives into how to maximize your collection of items with varying costs and values (number of items) for a given budget. We map this problem to the classic 0/1 knapsack problem and introduce two dynamic programming solutions in detail: one is suitable for regular budget sizes, and the other is optimized to deal with situations where the budget is extremely large and the total value of items is relatively small, aiming to help readers efficiently solve such resource allocation problems.
Dec 12, 2025 am 11:18 AM
Elasticsearch advanced sorting: implementing multi-field and conditional logical combination sorting
This article takes an in-depth look at techniques for implementing complex multi-field sorting in Elasticsearch, with a particular focus on when the sorting rules depend on field content (such as the presence or absence of a tag). We will learn how to use Painless scripts to perform conditional sorting to meet advanced needs such as "labeled documents are sorted by creation time in ascending order, and unlabeled documents are in descending order by creation time", and detailed implementation steps and sample codes will be provided.
Dec 12, 2025 am 11:15 AM
Properly mapping list objects in YAML using SnakeYAML
This article details how to correctly handle and convert complex data structures containing list (List) types when using the SnakeYAML library to map YAML files to Java objects. By providing clear class definitions and YAML configuration examples, it helps developers avoid common mistakes and ensures that list objects can be serialized and deserialized accurately.
Dec 12, 2025 am 11:09 AM
How to properly wait for WildFly server reload to complete
This article details how to accurately determine whether the server is fully started and ready after programmatically triggering a WildFly server reload. We will explore the limitations of Process.waitFor() and introduce a reliable solution based on the WildFly management API (ModelControllerClient). By continuously monitoring the running status of the server, it ensures that subsequent operations (such as application deployment) can be executed after the server is stable to avoid timing issues.
Dec 12, 2025 am 11:06 AM
Groovy: Use groupBy method to group list elements and build parent-child structure
This article explains in detail how to efficiently group a list containing multiple Maps according to specified keys (such as coverageType) in Groovy and reconstruct it into a clear parent-child structure. By leveraging Groovy's powerful groupBy and collect methods, you can avoid common coverage problems and aggregate elements of the same type into sublists, thereby generating a structured, easy-to-process data format.
Dec 12, 2025 am 11:03 AM
Using Jackson to handle serialization and deserialization of random keys in JSON
This article takes an in-depth look at how to use the Jackson library to handle scenarios where JSON data contains randomly generated top-level keys. In response to the problem that Jackson cannot recognize dynamic keys by default, the article provides two core solutions: one is to use TypeReference to directly deserialize JSON into a Map structure, which is suitable for situations where the top-level keys are completely unpredictable; the other is to adjust the JSON structure and encapsulate it under a fixed key, allowing the use of POJOs containing Map fields for mapping. Help developers effectively deal with such complex JSON structures through sample code and precautions.
Dec 12, 2025 am 11:00 AM
Variable scope analysis and multi-input processing practice in Java loops
This article takes an in-depth look at the scoping rules for loop variables in Java and explains why variables declared inside a loop cannot be directly accessed outside the loop. For scenarios where multiple input values need to be collected and processed within a loop, the tutorial provides practical methods for using arrays as a solution, supplemented by code examples to ensure that the data can still be effectively accessed and utilized after the loop ends.
Dec 12, 2025 am 10:51 AM
Safely and efficiently update database records using JDBC PreparedStatement
This article aims to guide readers on how to update database records efficiently and safely through JDBC PreparedStatement. In view of the ORA-00933: SQL command not properly ended error and SQL injection risk that may be caused by traditional string concatenation SQL statements, the article explains in detail the working principle and advantages of PreparedStatement, and provides a complete Java code example to demonstrate how to build parameterized queries to achieve robust database update operations.
Dec 12, 2025 am 09:21 AM
Guide to subscriber order control in Spring Integration Java DSL
This article deeply explores the subscriber execution order issue of the Publish-Subscribe Channel in Spring Integration, and provides a method to accurately control the message processing process by configuring the order attribute of the endpoint (Endpoint) in Java DSL. This is crucial for operations that require strict dependencies (such as storing data first and then deleting files), ensuring the correctness of business logic and data consistency.
Dec 12, 2025 am 09:09 AM
Solve the error caused by Curl when SDKMAN installs Gradle
When you encounter a download failure (such as curl: (23) Failed writing received data to disk/application) error when using SDKMAN to install Gradle, it is usually due to the incompatibility between the system's default curl version (especially curl installed through Snap) and the operation of SDKMAN. This tutorial will guide you on how to solve this problem by removing the Snap version of curl and installing the APT version of curl, ensuring that SDKMAN can successfully download and install Gradle.
Dec 12, 2025 am 08:30 AM
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