Article Tags
Article Tags
Troubleshooting and solving the problem of message loss caused by restarting Flink Job Manager
This article analyzes and solves the problem of message loss caused by Job Manager restarting after configuring the restart policy in Flink version 1.16. The article will discuss the various reasons that may lead to message loss, including infinite loops caused by Poison Pill, Source not supporting Checkpointing or Rewind, and improper Checkpoint Storage configuration, etc., and provide corresponding troubleshooting ideas and solutions to help readers ensure the reliability and data integrity of Flink applications.
Dec 02, 2025 am 11:03 AM
Optimize Maven test output: keep test results consistent with output
This article aims to solve the problem of the JUnit Jupiter engine reordering test output during Maven test execution. We'll explore why this occurs and how you can improve troubleshooting efficiency by adjusting your test framework or configuration to keep test results in the same order as your code output. We will also discuss the importance of test order and practices to avoid unnecessary dependencies.
Dec 02, 2025 am 10:21 AM
In-depth analysis of Java concurrent binary search tree deadlock problem and correct practice of ReentrantLock
This article deeply explores common deadlock problems in the implementation of fine-grained concurrent binary search trees in Java, especially concurrency failures caused by repeated acquisition and improper release of ReentrantLock. By analyzing incorrect locking patterns, the article reveals the root causes of deadlocks and provides correct solutions based on the "hand-over-hand locking" strategy. The tutorial emphasizes the correct use of ReentrantLock, lock granularity selection, and the importance of exception safety in concurrent programming, aiming to help developers build robust and efficient concurrent data structures.
Dec 02, 2025 am 09:00 AM
VS Code Java development: Configure command line parameters through launch.json
When debugging or running Java programs in VS Code, it is a common requirement to pass command line parameters. This article will provide detailed guidance on how to use the launch.json file of VS Code to set and pass command line parameters for Java applications by simply configuring args parameters, thereby achieving flexible program startup and debugging without manual input in the terminal, significantly improving development efficiency.
Dec 02, 2025 am 08:48 AM
Java JUnit4 Test: Understanding Proper Initialization of Instance Variables in Constructors
This article discusses the problem of instance variable initialization failure in Java JUnit4 testing due to unclear understanding of variable scope in the constructor. By analyzing a common mistake, namely declaring local variables in the constructor instead of assigning values to instance variables, and providing two effective correction methods (direct assignment or using the this keyword), ensure that unit tests can correctly reflect the object state.
Dec 02, 2025 am 08:42 AM
Convert signed byte array to unsigned integer array: Java Implementation Guide
This document aims to provide practical guidance for converting signed byte arrays to unsigned integer arrays in Java. Since Java's byte type is signed, conversion is required when it needs to be treated as an unsigned byte. This article will explore several implementation methods, including loop iteration and using Byte.toUnsignedInt, and analyze their advantages and disadvantages to help developers choose the solution that best suits their scenario.
Dec 02, 2025 am 08:18 AM
Resolve AnsiPosition type conversion error during STS console cleanup
This article aims to resolve an AnsiPosition type conversion internal error that occurs when cleaning the console in Spring Tool Suite (STS). This error is usually caused by conflicts between multiple Ansi Console plug-in instances, causing the console to function abnormally. The core solution is to identify and uninstall any conflicting Ansi Console plug-ins, thereby restoring normal operation of the console.
Dec 02, 2025 am 07:12 AM
Java While Loop Does Not End As Expected: Pitfalls and Solutions of String Comparison
This article aims to solve the problem of while loop in Java not ending as expected due to improper string comparison method. By analyzing error codes, it deeply discusses the correct method of string comparison and provides modified code examples to help readers understand and avoid similar errors and ensure the correct execution of program logic.
Dec 02, 2025 am 07:03 AM
Database query timeout and connection pool configuration practice in Spring Boot
In response to the problem of long-term unresponsiveness of database queries in Spring Boot applications, this article will analyze in detail the limitations of the timeout attribute in the @Transactional annotation, and provide a solution to effectively control the database connection waiting time by configuring the spring.datasource.hikari.connection-timeout parameter of the HikariCP connection pool, thereby improving application stability and responsiveness.
Dec 02, 2025 am 06:51 AM
QueryDSL group query and complex DTO list projection practice
This article explores in depth how to use QueryDSL to implement complex grouped queries, especially after grouping entities by a certain field and projecting them into a parent DTO structure containing a list of child DTOs. In response to the problem that the traditional Projections.constructor cannot directly project the list after groupBy, the article introduces the solution of GroupBy.transform in detail, and shows how to define DTO, build queries and perform data conversion through specific code examples, aiming to help developers efficiently build type-safe complex data aggregation queries.
Dec 02, 2025 am 06:27 AM
Accurately calculate time difference in Java: Say goodbye to the traps of Date and SimpleDateFormat
This article takes an in-depth look at common time zone pitfalls that can result from java.util.Date and SimpleDateFormat when calculating time differences in Java, especially when they are used incorrectly to represent durations. By analyzing the design flaws of the old API, the article emphasizes the importance of using the java.time package (JSR-310) and provides a modern solution for accurate and clear time difference calculation using LocalTime and Duration, helping developers avoid calculation errors caused by time zone conversion.
Dec 02, 2025 am 06:24 AM
Java custom class method chain calling: design and implementation of object state modification
This article explores how custom class methods in Java implement chain calls to modify the internal state of the object. By having the modification method return the current object instance (this), developers can elegantly chain object creation with state modification operations, such as new Class(value).modifyMethod(), thereby improving code simplicity and readability.
Dec 02, 2025 am 05:39 AM
Email address validation in Java: RegEx usage, exception handling and best practices
This article takes an in-depth look at the proper way and common pitfalls of using regular expressions for email address validation in Java. We will fix a common RegEx error, clarify the appropriate use of try-catch blocks in verification logic, and provide two optimized Java implementations: one is the recommended method of returning a Boolean value, and the other is an exception handling-based solution designed to help developers write more robust, efficient, and best-practice verification code.
Dec 02, 2025 am 05:30 AM
In-depth understanding of the role matching mechanism and solutions of @RolesAllowed in Java EE
This article aims to solve the problem that the @RolesAllowed annotation in Java EE applications cannot identify authenticated user roles, even if HttpServletRequest.isUserInRole() returns true. The core reason is an inconsistency between the security framework's default matching mechanism for role names (e.g., roles may be expected to be prefixed with ROLE_) and the actual provided role names. The article will provide @PreAuthorize solutions for Spring Security environments and explore ways to solve such role mapping issues by adjusting security configurations in pure Java EE containers.
Dec 02, 2025 am 05:24 AM
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