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Hibernate @OneToOne Detailed explanation of lazy loading problems in two-way association

This article aims to solve the problem of delayed loading of subentities in @OneToOne bidirectional association in Hibernate. By analyzing the cause of the problem, providing a solution, and explaining why lazy loading of @OneToOne differs from other association types. We will explore how to properly configure the association and how to use Spring JPA or EntityManager to achieve lazy loading.

Sep 05, 2025 am 11:54 AM

Implementation of ordered Map in Kotlin and analysis of toSortedMap function

Discussing the missing TreeMap in Kotlin and its alternatives. The article explains the fundamental difference between TreeMap and HashMap in element sorting, and introduces in detail how Kotlin implements ordered mapping function through Map's toSortedMap extension function on the JVM platform. Its underlying layer utilizes Java's TreeMap. At the same time, the availability limitations of this feature on non-JVM platforms are also mentioned.

Sep 05, 2025 am 11:48 AM

Java multitasking concurrent execution and performance benchmarking practice

This article aims to guide how to implement multitasking concurrent execution in Java, especially in performance benchmark scenarios. We will explore how to create and manage concurrent tasks using Java's Thread and Runnable interfaces, explain in detail how to accurately measure task execution time (using System.nanoTime()), and how to wait for all tasks to complete and summarize the results through Thread.join(). The article will also introduce the ExecutorService in the java.util.concurrent package to provide a more advanced concurrency management solution to ensure that the program completes multitasking efficiently and accurately.

Sep 05, 2025 am 11:21 AM

Gradle Dependency Management: A Comprehensive Guide to Excluding Specific Dependencies

This article aims to solve the problem of excluding specific dependencies in Gradle projects, especially when there are multiple modules in the project and the dependencies are complex. We will explore how to find out where unwanted dependencies are introduced and effectively exclude them using the mechanisms provided by Gradle, ensuring clear and version consistency of project dependencies. This article will provide a variety of methods to exclude dependencies and explain them in combination with actual cases to help readers better understand and apply them.

Sep 05, 2025 am 11:18 AM

Search strategies and common pitfalls for custom objects in Java ArrayList

In Java, when using the ArrayList.contains() method directly to find a custom object, if the type passed in does not match the element type in the list or the equals() method is not correctly rewrite, the expected result will not be obtained. This article will discuss in detail the working principle of contains(), and introduce the correct way to efficiently and accurately find custom objects in ArrayList through iteration, Java 8 Stream API and other methods, and provide performance optimization suggestions.

Sep 05, 2025 am 11:09 AM

Best practices for conditional message printing in Java loops: Taking inventory updates as an example

When processing list data updates, conditional judgments placed directly in the loop may lead to undesired duplicate message output. This article will explore this common problem in Java in depth, and provide two efficient and professional solutions by introducing Boolean flag bits or leveraging early exit mechanisms to ensure the accuracy and logic of message prompts to optimize user experience in business scenarios such as inventory updates.

Sep 05, 2025 am 10:54 AM

Minimize the time required to complete a task: a tutorial on scanning line algorithms

This article introduces an effective method to solve task scheduling problems using scanning line algorithm. This problem involves a series of tasks with a start time, an end time, and a required completion time. The goal is to find the minimum total time required to complete all tasks, allow multiple tasks to be processed simultaneously, and the task completion time can be discontinuous. This article will explain the logic of the algorithm in detail and provide corresponding code examples to help readers understand and apply the method.

Sep 05, 2025 am 10:51 AM

Java manually implements SMTP email sending: Detailed explanation of EHLO and AUTH PLAIN authentication

This article discusses the "530 5.5.1 Authentication Required" error caused by the lack of authentication mechanism when manually building the SMTP mail client without using the JavaMail library. The article explains in detail how to successfully send email by replacing HELO as EHLO command, and using the AUTH PLAIN authentication mechanism, combined with Base64-encoded user credentials.

Sep 05, 2025 am 09:48 AM

Fix Android Calculator app crash: Avoid empty values ??and invalid characters

This article aims to help developers solve the crash problem caused by Android calculator applications due to attempts to parse empty strings or strings containing invalid characters. By preprocessing the string before parsing, including null counting and removing spaces, the NumberFormatException exception can be effectively avoided, thereby improving the stability and user experience of the application. The article provides detailed code examples and considerations to help developers better understand and apply these techniques.

Sep 05, 2025 am 09:45 AM

Java merge sorting in-depth analysis: Solve the local sorting problem caused by the add method

This article explores a key problem that is often encountered in Java when the sorted elements are written back to the original list, misuse of ArrayList.add() instead of ArrayList.set() will cause data overwrite or only some elements to be correctly sorted. The article explains the differences between the two methods in detail, provides correct code examples, and emphasizes programming best practices such as using interfaces rather than concrete implementation classes to ensure stability and efficiency of merge sorting, while also discussing strategies for handling complex data association sorting.

Sep 05, 2025 am 09:39 AM

Solve the problem that Lombok cannot be used in the test class

This article aims to solve the problem that when using Lombok, the Lombok functionality of entity classes (such as getters, setters, builders, etc.) cannot be accessed in the test class. By modifying the Maven configuration file, make sure that Lombok is available in the test classpath, so that the test class can use the methods and annotations generated by Lombok.

Sep 05, 2025 am 09:27 AM

Complex object type conversion in Java: Service layer return type adaptation practice

In Java application development, especially when processing data at the Service layer, it is often encountered that one data model (such as an Excel object) needs to be converted into another target data model (such as a Resresource object) to meet the expected return type of the Controller layer or other modules. This article will explore in-depth how to effectively convert between unrelated object types. The core strategy is to use the custom mapper mode and explain its implementation and application in detail with sample code. It aims to provide a set of clear and professional solutions to ensure smooth and type safety of data flow.

Sep 05, 2025 am 09:15 AM

Struts 2 Integration with AJAX: Tutorial for Correct Handling JSON Responses

This tutorial aims to solve common parsing errors in Struts 2 when returning JSON data using AJAX. When manually writing JSON strings to the response stream, the JSON plugin of Struts 2 will cause the client to receive an invalid response because it cannot find the serializable Action property. The article will explain in detail how to achieve efficient and correct JSON data interaction by defining attributes with Getter methods in Action and using the automatic serialization mechanism of the Struts 2 JSON plug-in.

Sep 05, 2025 am 08:36 AM

Android Tutorial: Read PDF files from specified folder and display in RecyclerView

This document is intended to guide Android developers how to read PDF files from a specified folder on the device and display them in a RecyclerView. We will cover the necessary permission requests, file readings, and how to display these files in RecyclerView to ensure that the code works properly in Android API 30 and above.

Sep 05, 2025 am 08:03 AM