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Technical Articles

Java

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Exception handling in Java parallel method calls: Ensure that independent tasks do not interrupt the overall process

This article explores how to handle exceptions thrown by a single task when executing parallel method calls in Java to avoid interrupting the entire parallel processing flow. By adopting a non-instant exception propagation strategy, the exceptions of each task are captured and collected independently, rather than aborting all tasks immediately, ensuring that even if some tasks fail, other tasks can continue to be executed and completed, improving the robustness of the system.

Aug 22, 2025 pm 12:33 PM

Spring Data JPA Projections: Efficient query and mapping specific fields

This article delves into how to efficiently select specific fields from a database and map them to a custom structure in Spring Data JPA. In response to the problem of directly querying some fields with @Query, the article introduces the Spring Data JPA Projections mechanism in detail, including the definition and usage methods of interface projection. Through sample code, it explains how to create a projection interface and use it in Repository to obtain the required data, thereby improving query efficiency and avoiding unnecessary full entity loading.

Aug 22, 2025 pm 12:24 PM

Comparison of minimum values ??in Java arrays: Correct use of OptionalInt vs. alternatives

This article aims to solve the common problem of comparing the minimum values ??of two arrays in Java, especially when using the min() method of the Stream API. We will explore the nature of OptionalInt and its limitations in comparison operations in depth, and provide two effective solutions: one is to safely obtain the original integer value through the getAsInt() method, and the other is to simplify the code using the NumberUtils.min() tool method in the Apache Commons Lang library. The article will contain detailed code examples and notes to help developers write more robust and efficient array minimum comparison logic.

Aug 22, 2025 pm 12:15 PM

Selenium web page loading blank: global retry mechanism implementation

This article describes how to solve the problem of web page loading blank due to unstable network environment or slow server response in Selenium automation testing. By implementing the global retry mechanism, it can automatically refresh and retry when the page loads fail, thereby improving the stability and reliability of the test. We will provide a page load state detection method based on document.readyState and encapsulate it into a reusable function for global application in the Selenium test framework.

Aug 22, 2025 pm 12:03 PM

Solve the 'Multiple Columns of Same Attribute' exception in Vaadin Grid: Understand automatic column generation and manual addition

Vaadin Grid is passed into an entity class (such as new Grid(Audit.class) when initializing, and will automatically create columns for all its properties. If grid.addColumns("propertyName") is then manually called to add the existing property column, it will cause the "Multiple columns for the same property" exception. This article will analyze the root cause of this problem in depth and provide the correct Grid column configuration method to ensure the data is displayed correctly.

Aug 22, 2025 am 11:57 AM

Accessing data members of parent Activity in the startup Activity in Android

This article introduces how to access the data members of the parent Activity in the launched child Activity in Android applications. By migrating business logic to ViewModel, data sharing can be achieved, avoiding direct access to parent Activity objects, thereby improving the maintainability and testability of the code. This article will explain in detail how to use ViewModel and provide sample code.

Aug 22, 2025 am 11:54 AM

Check if Row Schema contains specific field names in Apache Spark

This article details how to efficiently and correctly check whether the StructType schema of a Row object contains a specific field name in Apache Spark applications. We will explore two main public API methods: StructType.exists() and StructType.getFieldIndex(), and provide corresponding code examples to help developers write more robust Spark data processing logic.

Aug 22, 2025 am 11:51 AM

Tutorial for efficiently finding prime numbers in a specified range and returning arrays in Java

This tutorial details how to find prime numbers in a specified range in Java and collect them into an array of integers to return. We will explore the core logic of prime judgment, how to dynamically collect results (using ArrayList), and how to convert lists into arrays using the Java Stream API. In addition, complete code examples and guidance on how to correctly print the content of the array will be provided to ensure the professionalism and practicality of the code.

Aug 22, 2025 am 11:48 AM

Remove the first object instance of the specified class from Java ArrayList

This article describes how to remove the first object instance of the specified class from the ArrayList in Java. By using the instanceof keyword, we can effectively identify the target object in the ArrayList and remove it. Avoiding the overhead of creating new objects for comparison and the complexity brought by dealing with other subclass objects, it provides a simple and efficient solution.

Aug 22, 2025 am 11:45 AM

Handling exceptions in a for loop containing a try block

This article discusses the impact of exception handling on loop execution flow when nesting for loops in a try-catch block. By analyzing an example of a car rental service, it explains in detail how to correctly use the try-catch block to ensure the complete execution of the loop when an exception is thrown inside the loop, and provides corresponding code examples and precautions to help readers better understand and apply the exception handling mechanism.

Aug 22, 2025 am 11:42 AM

Azure Blob storage upload file failed: Troubleshooting and resolving permission issues

This article aims to help developers resolve the "AuthorizationFailure: This request is not authorized to perform this operation" error encountered when uploading files on Azure Blob storage. Provide detailed troubleshooting steps and solutions to ensure that the application can successfully upload files to Azure Blob storage by checking network configuration and access rights, especially if the client IP address is allowed to access the storage account.

Aug 22, 2025 am 11:39 AM

How to throw an exception in Java?

TothrowanexceptioninJava,usethethrowkeywordfollowedbyaThrowableinstance,suchasthrownewIllegalArgumentException("Agecannotbenegative");,whichhaltsnormalexecutionandtransferscontroltothenearestmatchingcatchblockifpresent,andforcheckedexceptio

Aug 22, 2025 am 11:10 AM

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Java String Segmentation: Rearrange words by embedded numbers using regular expressions and Stream API

This tutorial details how to use Java to process strings containing numbers and reorder the words in them based on those numbers. By combining the search and segmentation capabilities of regular expressions and chain operations of Stream API, we can efficiently extract words and their corresponding sorted numbers, and finally reconstruct a new string arranged in the specified order. The article provides specific code examples and detailed step analysis to help readers understand and master this advanced string processing technique.

Aug 22, 2025 am 11:09 AM

Cross-language compatibility guide for Java generation of ZIP files and Go decompression

This article aims to solve the errors such as "zlib: invalid header" encountered when Go attempts to decompress using compress/zlib or compress/flate after Java programs use ZipOutputStream to generate compressed data. The core problem is that Java generates standard ZIP archives, not pure zlib or flat compression streams. The solution is that Go should use its built-in archive/zip package to correctly parse and decompress ZIP archives to ensure compatibility and reliability of cross-language data transmission.

Aug 22, 2025 am 11:00 AM