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JavaFX JAR Packaging: Tutorial to Ensure FXML Resources Loading Correctly

This article aims to solve the common problem that resource files such as FXML cannot load correctly after JavaFX applications are packaged as JAR files. By explaining in detail how to configure IntelliJ IDEA's JAR packaging artifacts, ensure that the resource file is included in the final JAR, and guides how to correctly adjust the loading path of the FXML file, so as to ensure that the application can run stably in an independent JAR environment.

Aug 26, 2025 am 12:18 AM

Methods to access DynamoDB using the Spring JdbcTemplate class

This article will explore how to leverage the JdbcTemplate class in the Spring ecosystem and how to apply its concept to the NoSQL database DynamoDB. Although JdbcTemplate is not designed directly for DynamoDB, we can draw on its design ideas and achieve similar data access and streaming functions through other tools and libraries provided by Spring. This article will introduce how to build a DynamoDB-based data access layer and provide corresponding code examples and considerations.

Aug 25, 2025 pm 01:36 PM

Responsive processing of Flink aggregated data in Spring Boot applications

This article explores the issue of integrating Flink in Spring Boot applications and handling the results of Flink unbounded data source aggregation. For scenarios where Flink aggregation results cannot be returned directly in API responses, solutions are provided to convert unbounded data sources into bounded data sources, and specific implementation methods for data sources such as Kafka are discussed to achieve on-demand acquisition of aggregation results.

Aug 25, 2025 pm 01:24 PM

Vaadin Grid column configuration: Avoid 'multiple columns of the same attribute' exception

This article aims to resolve the common "Multiple columns for the same property" exception in Vaadin Grid. This problem usually stems from the misuse of Grid initialization method and column addition method. When using the new Grid(Entity.class) constructor, Vaadin Grid will automatically create columns for all public properties of the entity class; if the column with the same name is then explicitly added through grid.addColumns("propertyName"), it will cause duplicate definitions, thereby throwing an exception. The article will explain this mechanism in detail and provide correct column configuration methods to help develop

Aug 25, 2025 pm 01:00 PM

Check if Row Schema contains specified fields in Apache Spark

This article details how to efficiently check whether the StructType schema of a Row object contains a specific field name in Apache Spark. We will explore two main public methods: using the exists method to combine predicate functions for flexible matching, and using the getFieldIndex method to determine whether a field exists and obtain its index, and provide corresponding code examples to help developers accurately verify the data structure.

Aug 25, 2025 pm 12:57 PM

Minimize the time required to complete tasks: a scan line-based solution

This article describes a problem of using a scan line algorithm to solve the problem of minimizing the time it takes to complete a given task. Tasks are defined by the start time, the end time, and the required time length. The core idea of ??the algorithm is to sort the start and end time points of the task, then simulate the time elapse, and maintain an active task stack, thereby calculating the minimum time required to complete all tasks.

Aug 25, 2025 pm 12:45 PM

How to create a custom exception in Java

Decidewhethertheexceptionshouldbechecked(extendException)orunchecked(extendRuntimeException)basedonrecoverability;2.Createaclasswithstandardconstructors(default,message,cause,andmessagewithcause)toensureproperexceptionhandling;3.Usethecustomexception

Aug 25, 2025 pm 12:34 PM

Optimize AWS Java SDK EC2 API calls: Use an asynchronous client to avoid connection resets

When calling EC2 services (such as describeImages) using the AWS Java SDK, you sometimes encounter the "Unable to execute HTTP request: Connection reset" error, while S3 and other services are called normally. This article will explore the root cause of this problem in depth and provide a solution: By replacing the synchronous client AmazonEC2ClientBuilder with the asynchronous client AmazonEC2AsyncClientBuilder, it can effectively solve the problem of request failure due to network or connection stability, ensuring the smooth execution of AWS service calls.

Aug 25, 2025 pm 12:27 PM

what is reflection in java

ReflectioninJavaenablesprogramstoexamineandmanipulateclasses,fields,methods,andconstructorsatruntime,providedbythejava.lang.reflectpackageandtheClassclass;itworksbyaccessingmetadatastoredinClassobjectswhenaclassisloaded,allowingdynamicinstantiation,m

Aug 25, 2025 pm 12:16 PM

Java Tutorial: Aggregate the values ??of duplicate elements in List using Map

This article describes how to efficiently aggregate the values ??of elements with duplicate keys in List using Map data structures and Stream APIs in Java. By converting List to Map and using the compute method or toMap collector, it is easy to accumulate attributes such as Amount and Quantity of the repeating elements to finally obtain the aggregated result.

Aug 25, 2025 pm 12:09 PM

Aggregate the values ??of duplicate elements in List using Java Map

This article describes how to use Java Map structure to effectively aggregate numeric values ??of elements of the same type in a List, such as Amount and Quantity. By converting List to Map and leveraging the compute method or the toMap operation of the Stream API, manual loops and comparisons can be avoided, simplifying code and increasing efficiency. This tutorial provides detailed code examples showing how to create, update, and merge data in a map to finally get aggregated results.

Aug 25, 2025 am 11:57 AM

How to rearrange words in strings based on embedded numbers

This tutorial will explore how to reorder words based on numbers embedded in strings. We will take "my1kiran4name2is3" as an example, and the target output is "my name is kiran". The article will detail a solution based on Java regular expressions (Lookarounds) and Stream API, parse how it works, discuss the tradeoff between simplicity and readability of the approach, and provide an optimization that ensures correct sorting.

Aug 25, 2025 am 11:54 AM

Calculate the difference between days, hours, minutes and seconds between two dates and times in Java

This article aims to guide Java developers on how to calculate the difference in days, hours, minutes and seconds between a given date and time (for example: "Wednesday 02-October-2022 11:51:1 PM") and the current time. The article will provide detailed descriptions on how to parse date and time strings using DateTimeFormatter, how to process time zone information, and how to calculate time difference using Duration class, and provide corresponding sample code.

Aug 25, 2025 am 11:51 AM

Use JMockit to auto-assemble dependencies and inject Mock objects

This article describes how to use the JMockit framework to automatically assemble dependencies in test classes and inject Mock objects into the class to be tested. The combination of @Tested and @Injectable annotations allows you to easily create instances with Mock dependencies, simplifying the writing process of unit tests and ensuring the validity and reliability of tests. The article provides detailed code examples and precautions to help readers quickly master the skills of using JMockit.

Aug 25, 2025 am 11:45 AM