Article Tags
Article Tags
Detailed explanation of Spring Kafka consumer failure message retry mechanism and correct configuration guide
This article explains in detail the principle and implementation of message failure retry in manual confirmation mode in Spring Kafka, points out the root cause of failure to retry without throwing an exception, and provides a reliable retry configuration solution based on DefaultErrorHandler.
Mar 31, 2026 am 07:30 AM
How to correctly deploy and download static PDF files in Tomcat
This article explains in detail the correct storage path and HTML download link writing method for static resources (such as PDF) in Tomcat applications, and solves the problem of "Failed – No file" download failure caused by path errors.
Mar 31, 2026 am 07:27 AM
How to correctly save many-to-many relationship entities in Spring Boot
This article explains in detail the root cause of null fields in associated entities (such as Sureler) under the @ManyToMany relationship in Spring Boot - lazy loading does not trigger property initialization, and provides a complete solution based on @EntityGraph, custom JPQL query and transaction boundary optimization.
Mar 31, 2026 am 06:57 AM
Handling Nested YAML Structures in Java: A Guide to Jackson-Based POJO Mapping
This tutorial aims to address common issues encountered when parsing nested YAML configuration files in Java, specifically how to efficiently access deep configuration values. This article will introduce in detail how to use the jackson-dataformat-yaml library combined with the POJO (Plain Old Java Object) mapping mechanism to convert complex YAML structures into easy-to-operate Java objects. Through sample code, readers will learn how to define a data model, configure the Jackson parser, and securely access nested data, while emphasizing Jackson's reliance on the setter method naming convention during deserialization.
Mar 31, 2026 am 05:39 AM
A complete practical guide to support nested submodule structures in Maven multi-module projects
Maven allows you to build hierarchical nested module structures in multi-module projects (for example, architecture_utils is divided into sub-modules such as utils_io and utils_math). This can be achieved by correctly configuring the relationship between the parent POM and each sub-module, and it complies with Maven standard conventions.
Mar 31, 2026 am 05:30 AM
How to efficiently set different frontName values for products with duplicate names versus unique names
This article introduces an efficient solution based on Java Stream and HashSet for batch processing of product lists: for products with repeated names, category names are spliced to generate frontName, and for products with unique names, name is directly assigned. The method time complexity is close to O(n), avoiding nested traversals and taking into account both readability and performance.
Mar 31, 2026 am 05:03 AM
How to correctly set the xmlns namespace URI for the root element in a SOAP request
This article explains in detail how to accurately control the default namespace (xmlns) of SOAP message root elements such as AirShoppingRQ through JAXB annotations, avoid generating empty strings or automatically generated ns2/ns3 prefixes, and ensure compliance with the XML namespace requirements of strict servers such as IATA EDIST.
Mar 31, 2026 am 04:45 AM
Get the start and end dates of a specified week using Java java.time API
This article details how to use the java.time API in Java 8 and above to accurately calculate the start date (Monday) and end date (Sunday) of the week based on a given year and week number (following the ISO 8601 standard). By parsing a string in a specific format through DateTimeFormatter.ISO_WEEK_DATE, you can easily obtain the LocalDate object, and it also discusses in depth the important differences between the anniversary (week-year) and the calendar year (calendar year) to ensure the accuracy of date calculations.
Mar 31, 2026 am 04:39 AM
How to share plugin configurations across Gradle projects in different repositories
This article details how to efficiently and consistently share plug-in configurations among multiple Gradle projects, especially projects distributed in different code repositories. The core method is to use Gradle's "Convention Plugins" mechanism to encapsulate common plug-in declarations, dependency management, and task configurations into reusable custom plug-ins, thereby avoiding duplication of code and improving the unity and maintainability of project construction.
Mar 31, 2026 am 04:21 AM
Guava Multimap: Efficiently obtain and print all associated values of the specified key
Guava Multimap is a powerful tool for processing multi-value mapping relationships with one click. To get all associated values for a specific key, you should directly use the Multimap#get(K) method it provides. This method will return a Collection containing all matching values. Even if the key does not exist, it will return an empty collection instead of null, thus simplifying value retrieval and null value processing logic. It is a more concise and efficient solution than manually iterating the key set.
Mar 31, 2026 am 03:48 AM
Java implementation of merge sort: custom array slicing and multi-way merge strategy
This tutorial details how to implement recursive merge sort in Java, with a particular focus on array slicing with custom logic without relying on standard library methods such as Arrays.copyOfRange. In addition, the article also deeply discusses how to extend the traditional two-way merge operation to implement an efficient three-way merge function, and provides complete code examples, precautions and optimization suggestions, aiming to help readers master the core principles of merge sort and its implementation techniques under specific restrictions.
Mar 31, 2026 am 03:24 AM
Optimize Hibernate many-to-many relationships: use custom connection entities to avoid additional intermediate tables
When using Hibernate and Spring Data JPA to manage many-to-many relationships, if you use custom connection entities instead of letting JPA automatically generate intermediate tables, you need to pay special attention to the mapping configuration. This article will elaborate on how to accurately define the relationship by explicitly referencing the associated entity in the @Embeddable composite primary key and combining it with the mappedBy attribute of the @OneToMany annotation, thereby avoiding Hibernate from generating redundant intermediate tables and ensuring the accuracy and consistency of the database schema.
Mar 31, 2026 am 02:45 AM
Tutorial on date subtraction using java.time.LocalDate in Karate
This tutorial details how to implement precise date subtraction and formatting using Java 8's java.time.LocalDate API in the Karate testing framework. By defining helper functions, we will learn how to convert a date string to a LocalDate object, perform day subtraction, and reformat the result into a string, effectively avoiding common NaN errors in date calculations.
Mar 31, 2026 am 02:18 AM
How to losslessly convert a large floating point string to a BigDecimal in JSON deserialization
If a high-precision number in JSON (such as "amount": 123345555789123495.38) is parsed as a double and then converted to a BigDecimal, it will cause serious distortion due to the double binary precision limit; the correct approach is to skip the double intermediate representation and construct a BigDecimal directly from the original JSON string.
Mar 31, 2026 am 02:15 AM
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