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Troubleshooting and Solutions for PermitAll() failure in Spring Security

This article aims to resolve the issue that the allowAll() method in Spring Security configuration fails to allow anonymous users to access specific interfaces as expected. We will analyze the causes of this problem and provide corresponding solutions to ensure that public interfaces such as registration can be accessed normally by unauthenticated users. Through this article, developers can better understand how Spring Security works and avoid common configuration errors.

Aug 23, 2025 am 09:09 AM

How to implement menu loop return function in Java

This article aims to help Java beginners solve the problem of returning to the main menu after a program has completed a specific task. We will introduce a loop structure to ensure that the program can continuously provide menu options before the user opts out, thus achieving a more user-friendly user interaction experience. The article will provide detailed code examples and explanations to help you easily master the implementation of menu loops.

Aug 23, 2025 am 08:42 AM

Calculate the difference between two dates and times in Java

This article describes how to calculate the difference between two LocalDateTime objects using the java.time package in Java 8 and later, and display it in minutes. The date and time string is parsed through DateTimeFormatter, the time difference is calculated using the Duration class, and finally the result is converted into minutes for easy comparison and judgment.

Aug 23, 2025 am 08:33 AM

Optimize Java code: Simplify change calculations using division and modulus operations

This article aims to help Java beginners optimize their change calculation code, avoiding lengthy while loops by using division and modulus operations, thereby improving code efficiency and readability. We will provide detailed code examples and explanations to help readers understand and master this simpler implementation.

Aug 23, 2025 am 08:30 AM

Compatibility of using different versions of AspectJ runtime and compile-time weaving code

This article discusses compatibility issues with different versions of runtime environments when using AspectJ for compile-time weaving. Especially when the project relies on external libraries compiled with older versions of AspectJ, it is safe and feasible to upgrade the AspectJ runtime version. The article gives clear suggestions and explains the reasons behind it to help developers avoid potential compatibility issues.

Aug 23, 2025 am 08:24 AM

Dynamic configuration: Loading Spring Boot application properties from the database

This article describes how to migrate the application.properties configuration of Spring Boot application to the database to implement dynamic configuration loading without restarting the server after each configuration modification. Dynamic updates and management of configurations are achieved by customizing PropertySource, reading configuration information from the database and adding it to Spring Boot's environment properties.

Aug 23, 2025 am 08:15 AM

Calculate the time difference between two LocalDateTime objects in Java

This article introduces several methods to calculate the time difference between two LocalDateTime objects in Java. The focus is on how to use the Duration class to obtain the time difference in different units such as minutes, hours, and days. Through sample code, readers can quickly master the skills of calculating time differences and apply them to actual development, such as determining whether two time points exceed a specific time interval.

Aug 23, 2025 am 08:06 AM

A Guide to Building RESTful Web Services in Java with JAX-RS

JAX-RS is a Java standard used to build RESTfulWeb services, which simplifies development through annotations; 1. Using JAX-RS, you need to select implementations such as Jersey and add relevant dependencies in pom.xml; 2. Configure web.xml to register Servlet containers and specify resource package paths; 3. Create resource classes with @Path, @GET, etc. to define endpoints; 4. Use @Produces and @Consumes to process JSON and other media types, and cooperate with Jackson to achieve serialization; 5. Extract request parameters through @QueryParam, @PathParam, etc.; 6. Use ExceptionMapper to uniformly handle exceptions and return

Aug 23, 2025 am 07:45 AM

How to search an array in Java

UselinearsearchforunsortedorsmallarraysbyiteratingthrougheachelementwithO(n)timecomplexity.2.Forsortedarrays,applybinarysearchviaArrays.binarySearch()ormanualimplementationforO(logn)efficiency,ensuringthearrayissortedbeforehand.3.Whensearchingobjecta

Aug 23, 2025 am 07:44 AM

Garbage-First (G1) Garbage Collector in Java Explained

G1isthedefaultgarbagecollectorinOpenJDK11 designedforlargeheapsandpredictablepausetimes.2.Itdividestheheapintoequal-sizedregionsthatcandynamicallyserveasEden,Survivor,Old,orHumongousregions.3.G1prioritizescollectionofregionswiththemostgarbagetomeetpa

Aug 23, 2025 am 07:30 AM

Javax Validation: A Guide to Depth Verification of Collections (List) Elements

This article explores in-depth how to validate validation of each element in a Java collection such as List using the Javax Validation specification. By combining the latest features of Hibernate Validator and @Valid annotations, this tutorial will provide detailed explanations for applying constraint annotations on type parameters (such as @Email) and triggering verification on objects containing the collection, ensuring that each element in the collection complies with the expected validation rules, thus solving common set element verification difficulties.

Aug 23, 2025 am 07:27 AM

Implement web page collection function: use LocalStorage to store card data

This document will guide you how to implement a simple web collection function using JavaScript and LocalStorage. This feature allows users to add cards on web pages to favorites and view a list of favorites in a separate "favorites.html" page. This article will provide detailed code examples and steps to help you understand and implement this feature.

Aug 23, 2025 am 07:15 AM

Correct calls to abstract methods and instance methods in Java: Avoid static context errors

This article aims to resolve the common "non-static methods cannot be referenced from static context" error in Java development, especially when dealing with abstract classes and their subclasses. We will explore in-depth the essential difference between abstract methods, instance methods and static methods, analyze why calling their instance methods directly through abstract class names will lead to compilation errors, and provide the correct solution, that is, calling the abstract methods implemented by creating instances of concrete subclasses to ensure the correctness of the code and the principles of object-oriented design.

Aug 23, 2025 am 07:12 AM

Log4j 1.x Migrate to Log4j 2.x: Resolve XML configuration parsing errors

This document aims to help developers migrate projects from Log4j 1.x to Log4j 2.x, focusing on solving possible XML configuration parsing errors during the migration process, such as "The prefix "log4j" for element "log4j:configuration" is not bound". The article will provide detailed descriptions on how to modify XML configuration files to comply with the Log4j 2.x specifications and provide corresponding code examples.

Aug 23, 2025 am 07:09 AM