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Technical Articles

Java

Resolve IntelliJ IDEA and Tomcat 9 Java EE project runtime errors

This article aims to help developers resolve java.lang.IllegalStateException: Error starting child runtime error encountered when deploying Java EE projects using IntelliJ IDEA and Tomcat 9. The article will provide a series of steps to troubleshoot and solve problems, including checking the configuration of environment variables, confirming the consistency of JDK versions, and manually deploying WAR files to help developers quickly locate and solve problems and ensure that the project runs successfully.

Sep 11, 2025 pm 03:57 PM

SnakeYAML Mapping List Type: Correctly configure Java classes to avoid conversion errors

This article explores in-depth issues that may be encountered when using the SnakeYAML library to map List objects in YAML files to Java classes. This highlights how to correctly define Java classes to ensure that the data can be parsed and bound accurately when the YAML structure contains a list of complex objects, thus avoiding common type conversion errors. Through instance code and precautions, help developers master the correct posture of SnakeYAML processing lists.

Sep 11, 2025 pm 03:51 PM

Java Swing component rendering: Solve the problem of not displaying background images immediately

This article discusses the problem that background images or other components in Java Swing applications do not appear immediately. The core reason is the inappropriate order of component addition and framework visibility settings. By adding all UI components before the setVisible(true) method is called, or explicitly calling the repaint() method after the component is added dynamically, you can ensure that the UI elements are rendered correctly and promptly, thereby avoiding blank or incomplete situations during interface initialization.

Sep 11, 2025 pm 03:48 PM

Tips for efficiently checking whether the value of a byte array nibble (Nibble) exceeds the limit in Java

This article explores how to efficiently check whether the two nibbles of each byte in a byte array are less than or equal to 9 in Java. By comparatively analyzing common verification methods, a solution for optimization using bit operators is highlighted, which avoids expensive arithmetic operations and string conversions, significantly improving performance and is suitable for scenarios whereby a byte data format is required to quickly verify.

Sep 11, 2025 pm 03:39 PM

Deeply understand the containsKey() behavior of HashMap in Two Sum problem

This article explores in-depth how to efficiently use HashMap to find target number pairs when solving Two Sum problems. The focus is on explaining the common doubts that beginners encounter: how an empty HashMap returns true through the containsKey() method. Through detailed code analysis and execution processes, we will clarify the mechanism of HashMap step-by-step filling in the iteration process, thereby achieving efficient search logic and revealing the principles behind it.

Sep 11, 2025 pm 03:06 PM

Use parallel streams to concurrently process shared lists and collect results

This article introduces how to use Java Parallel Streams to concurrently process sublists in large lists and collect processing results. By splitting the list into multiple sublists and using the parallelStream() method, you can take full advantage of the multi-core processor and significantly improve processing efficiency. At the same time, this article also emphasizes the importance of synchronizing shared resources in a concurrent environment and provides sample code for processing results collection.

Sep 11, 2025 pm 03:00 PM

What is JVM in Java?

TheJVMisessentialforrunningJavaprogramsasitexecutesbytecodeonanydeviceoroperatingsystem.Itloadsbytecodeviaclassloaders,verifiesitssafety,executesitthroughinterpretationorJITcompilation,andmanagesmemorywithgarbagecollection.TheJVMenablesplatformindepe

Sep 11, 2025 pm 02:59 PM

Detailed explanation of the deserialization error retry strategy in Kafka batch listener

This article discusses in detail the strategies for handling deserialization errors and implementing retry in Spring Kafka batch listener. By default, the deserialization exception is considered a fatal error and is not retryed. By modifying the configuration of the DefaultErrorHandler and in conjunction with obtaining and re-throwing the DeserializationException from the message header in the listener, you can retry the deserialization error of the entire batch. The article provides specific configuration and code examples and highlights considerations for batch retry.

Sep 11, 2025 pm 02:54 PM

Security password policy and implementation tutorial in Android applications

This tutorial explores the security handling strategies of passwords in Android applications in depth. We will distinguish local authentication from server-side authentication, emphasizing the importance of server-side authentication and storage. The content covers NIST's recommended password policies, methods to securely store passwords using salted hashs (such as BCrypt), and practices to enhance password security through the integration of Have I Been Pwned (HIBP) APIs, aiming to help developers build a more robust and secure authentication system.

Sep 11, 2025 pm 02:51 PM

What is the Object class in Java?

TheObjectclassistherootofallclassesinJava,automaticallyinheritedbyeveryclassandprovidingessentialmethodssuchastoString(),equals(),hashCode(),clone(),getClass(),andthreadsynchronizationmethods;itenablesdefaultbehaviorsthatcanbeoverriddenformeaningfulo

Sep 11, 2025 pm 02:27 PM

java object class

Solve the problem of abnormal display of ANSI color code in Windows CMD terminal

This article explores the problem that Java applications cannot correctly display ANSI color code in Windows Command Prompt (CMD), although it works fine in integrated terminals such as VS Code. The article will introduce the root cause of this problem in detail and provide two main solutions: one is to delegate output through external commands (such as echo), and the other is to directly call Windows native functions to enable virtual terminal processing using the Foreign Function & Memory API provided by Java 22 and later to enable virtual terminal processing, thereby realizing color output of CMD terminals.

Sep 11, 2025 pm 01:48 PM

Efficient layout and performance optimization of a large number of pictures in Android ScrollView

This article aims to solve the performance bottlenecks that occur when ScrollView loads a large number of images in Android applications. In response to the inefficiency of TableLayout and GridLayout, we recommend using ConstraintLayout and emphasize the importance of building flat view levels. By optimizing layout selection and avoiding deep nesting, UI rendering can be significantly improved and user experience can be improved, especially when processing hundreds of image elements.

Sep 11, 2025 pm 01:45 PM

How to compare objects in Java using Comparable and Comparator?

Use the Comparable interface to define the natural sorting of objects. By implementing the compareTo() method within the class, it is suitable for single and clear sorting criteria (such as age and name); 2. Use the Comparator interface to implement custom or multiple sorting methods. There is no need to modify the original class. Comparable logic can be defined externally, which is suitable for multi-conditional sorting or third-party classes; 3. Comparable is located in the java.lang package, which requires the class to implement itself, and only supports one natural sorting, while Comparator is located in the java.util package, which supports multiple flexible sorting and can be added at any time; 4. It is recommended to use Comparable to set the default sorting, and use Comparator to achieve more complex

Sep 11, 2025 pm 01:27 PM

Reactor Flux dynamic data injection and stream merging strategy

This article aims to explore how to inject dynamic data into existing Flux in Reactor. We will introduce how to use Sinks.Many to create a controllable data source and effectively merge it with Flux provided by external libraries through operators such as Flux.merge() to form a unified responsive stream. At the same time, the article will focus on analyzing and coping strategies that may be encountered when subscribing to Flux (such as Flux based on UnicastProcessor).

Sep 11, 2025 pm 01:09 PM