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This article will explain in detail how to avoid NullPointerException caused by the date object being null when writing date data to Excel through Java code using the Apache POI library. The core solution is to null check the date object before trying to set the cell value. In this way, it is possible to ensure that when the date data is missing, the Excel cell can be properly kept blank, thereby improving the robustness of the code.
Aug 04, 2025 pm 08:33 PM
Deep learning models such as YOLOv8 have strict requirements on the size of the input image when inference. The fixed matrix structure inside the model determines that it can only process images of specific sizes. When the model makes inference on images of different sizes than when it was trained, without proper image preprocessing (such as size adjustment), it will result in prediction failure or performance drop sharply. This article will elaborate on its reasons and provide image size adjustment solutions based on PyTorch and TensorFlow to ensure the correct reasoning of the model on images of different sizes.
Aug 04, 2025 pm 08:30 PM
In response to the problem that containers cannot be interconnected in multiple projects in Docker Compose, this tutorial elaborates on its root cause - network isolation, and provides specific steps and examples to solve this problem by configuring an external network (external: true), ensuring that containers defined by different docker-compose.yml files can communicate seamlessly, improving the flexibility and efficiency of microservice deployment.
Aug 04, 2025 pm 08:27 PM
This tutorial explains in detail how to solve the problem of inter-container communication in different docker-compose.yml files when deploying multiple projects using Docker Compose. By analyzing the default network isolation mechanism, this article focuses on using Docker Compose's external network (external: true) function to realize containers sharing the same network across Compose files, thereby ensuring that Spring Boot applications can successfully connect to independent MQTT Broker and other services, avoiding "connection denial" errors, and improving the flexibility and connectivity of containerized deployment.
Aug 04, 2025 pm 08:24 PM
This tutorial details how to count the number of events occurring in a specific month (such as Saturday) for each independent user in a specific month. The article uses date functions such as DAYOFWEEK(), MONTH(), as well as GROUP BY and conditional aggregation (such as SUM(condition)) to realize data pivot, converting the results grouped by rows into report format displayed by columns, helping users to clearly analyze event data.
Aug 04, 2025 pm 08:21 PM
After the database is migrated, it is a common problem to display garbled characters in multilingual characters. In view of this phenomenon, this article deeply analyzes the various troubleshooting links from HTML meta tags, PDO connections, servers, databases, tables to table column encoding. It is highlighted that even if the server and table level encoding is correct, inconsistent encoding of table columns may lead to garbled code, and specific diagnostic and repair methods are provided to ensure that the characters are displayed correctly.
Aug 04, 2025 pm 08:18 PM
This tutorial explores how to group objects in an array using JavaScript, and its core is to create subarrays based on the same consecutive values of a certain property of an object. Unlike traditional deduplication, this approach focuses on maintaining the original order and identifying consecutive sequences of the same value. We will analyze in detail how to cleverly use the Array.prototype.reduce() method to achieve efficient and concise data structure conversion, which is suitable for scenarios where data needs to be classified in a specific order.
Aug 04, 2025 pm 08:15 PM
This article explores how to group objects in arrays in JavaScript. Unlike simple deduplication or full grouping, our goal is to create a new subarray based on the continuous changes in the value of an object's attribute. The article will introduce in detail how to use the Array.prototype.reduce() method, combine the state of the previous element, to efficiently implement this ordered, continuity-based grouping logic, and provide sample code and analysis.
Aug 04, 2025 pm 08:12 PM
This paper aims to solve the performance degradation caused by the mismatch between the input image size and the training size in deep learning models such as YOLOv8 during inference. The core reason is the fixed requirements for input sizes by the internal matrix of the neural network. The solution is to resize the image before it is fed into the model. The article will elaborate on its principles in detail and provide image size adjustment code examples under the two mainstream frameworks of PyTorch and TensorFlow to ensure that the model can also make efficient and accurate inference on images of different sizes.
Aug 04, 2025 pm 08:09 PM
This tutorial explains in detail how to group array objects in JavaScript: aggregate consecutive terms with the same "number" attribute into separate subarrays while maintaining the original order. By using the Array.prototype.reduce() method and combining the conditional judgment of the previous element, this complex data conversion can be efficiently implemented, and finally the one-dimensional object array is converted into a two-dimensional grouped array, which is suitable for scenarios where continuous data of the same attribute is processed in sequence.
Aug 04, 2025 pm 08:06 PM
This article discusses common problems when using Mockito's spy function to partially simulate a class method, the simulation value does not take effect. The core reason is that the production code directly instantiates the tested object, which causes the spy instance created in the test to be used. The article elaborates on how to solve this problem through Dependency Injection, a design pattern, and provides specific code examples and considerations to help developers perform unit testing more effectively.
Aug 04, 2025 pm 08:03 PM
This article provides detailed instructions on how to convert private code repositories to public repositories through the Bitbucket REST API. The core is to use the PUT method to update the repository properties, and it is particularly emphasized that the request body must include is_private: False and fork_policy: 'allow_forks' parameters to avoid the common 400 Bad Request errors. The article provides detailed Python code examples and steps to help developers successfully complete warehouse visibility configuration and improve the success rate of API operations.
Aug 04, 2025 pm 08:00 PM
This article explains in detail how to use JavaScript's Array.prototype.reduce() method to implement a special array grouping logic. This method dynamically slices the original array into multiple subarrays based on whether the specific attribute value (such as number) of adjacent elements in the array changes. When the attribute values are continuously the same, the elements are classified into the current subarray; once the attribute values change, a new subarray is opened, thereby efficiently implementing the structured data reorganization in order.
Aug 04, 2025 pm 07:57 PM
This tutorial explains in detail how to group objects in an array "in order" in JavaScript, that is, group them according to the continuous repetition of a certain property of an object. We will use the Array.prototype.reduce() method to effectively realize atypical data deduplication and grouping requirements by comparing the attribute values of the current element with the previous element.
Aug 04, 2025 pm 07:54 PM
After the database migration, it is a common problem to display garbled code in multilingual characters, especially on websites involving UTF-8 encoding. This article will explore in-depth common causes of such problems, including HTML page declarations, database connection settings, and character sets and sorting rules for databases, tables, and columns, and provides detailed diagnostic steps and solutions, with particular emphasis on the easily overlooked column-level encoding settings, aiming to help developers completely resolve display exceptions caused by inconsistent character encoding.
Aug 04, 2025 pm 07:51 PM
This article explores the common problem of the YOLOv8 model causing prediction failure when the training image size is inconsistent with the test image size. The core reason lies in the strict requirements of neural networks for input size. The solution is to make sure to make appropriate size adjustments before entering the image into the model for inference. The article will introduce in detail how to efficiently implement image preprocessing under the framework of PyTorch and TensorFlow to ensure the accuracy and stability of model inference, and provide code examples and precautions to help developers optimize the deployment effect of the YOLOv8 model.
Aug 04, 2025 pm 07:48 PM
This tutorial details how to programmatically convert a private code repository to a public repository using the Bitbucket REST API. The article starts with the basic API request construction, deeply analyzes the 400 Bad Request errors that may be encountered during the conversion process, and provides a complete solution, that is, in addition to setting is_private: False in the request body, it also needs to clearly specify fork_policy: "allow_forks". Through specific Python code examples, developers can effectively and securely implement warehouse visibility changes, and emphasize API authentication, error handling, and permissions.
Aug 04, 2025 pm 07:45 PM
When inference is performed using deep learning models such as YOLOv8, the model usually expects a fixed-size input image. If the test image size does not match the input size during model training, it will lead to inference failure or performance drop sharply. This article will dig into the reasons for this issue and provide a practical way to preprocess images (including dimensional adjustments) in PyTorch and TensorFlow to ensure that the model can also run stably and efficiently on images of different sizes.
Aug 04, 2025 pm 07:42 PM
This article aims to solve the problem that when the hover effect is triggered in web card design, internal images are accidentally cropped. We will dive into how overflow properties, position properties, and cascade order (z-index) in CSS interact to cause such visual anomalies. By optimizing HTML structure and CSS styles, ensure that images are displayed in full and correctly in any interactive state, and provide detailed code examples and practical suggestions.
Aug 04, 2025 pm 07:39 PM
This article aims to resolve the "400 Bad Request" error encountered when converting a private repository to a public repository through the Bitbucket REST API. The core problem is the lack of the necessary fork_policy parameters. We will elaborate on the correct API request body construction method in detail, provide complete Python sample code, and discuss relevant precautions to ensure that you can successfully complete the changes in repository properties.
Aug 04, 2025 pm 07:36 PM
This article explores in-depth the problem of multilingual (such as Urdu) characters displayed abnormally after a website is moved from one host to another. Although the server and table-level character set settings seem to be consistent, the root cause is that the character set encoding of the database table columns does not match. The article provides detailed diagnostic methods, SQL solutions, and best practices to prevent such problems, ensuring that multilingual content is displayed correctly.
Aug 04, 2025 pm 07:33 PM
This tutorial is intended to solve the problem that HTML tag content cannot be saved to the database correctly when using rich text editors such as TinyMCE or CKEditor. The article will elaborate on how to get the editor's complete HTML content through JavaScript and send it securely to the PHP backend, ultimately using preprocessing statements to store data containing HTML tags efficiently and securely into the database, while providing critical code examples and security best practices.
Aug 04, 2025 pm 07:30 PM
This article explores how to resolve the problem that List type option cannot be correctly parsed to null values when arity="0..1" and no parameters are provided when parsing the library using the Picocli command line. By introducing custom fallbackValue and ITypeConverter, we are able to convert specific placeholder strings into actual null, enabling precise control of missing values, ensuring that the command line parameter parsing behavior is as expected.
Aug 04, 2025 pm 07:27 PM
This article discusses in-depth common problems in the fact that the Mockito Spy pile setting method has not taken effect. The stake will fail when the production code creates instances independently rather than using Spy objects in the test. The core solution is to use dependency injection (DI), which allows the test environment to inject Spy objects and the production environment to inject real objects, thereby ensuring that the pile fixation takes effect and improving code testability. The article will elaborate on this practice in detail through code examples.
Aug 04, 2025 pm 07:24 PM
This article details how to convert private code repositories to public repositories using the Bitbucket REST API. With an actual Python example, we demonstrate the correct way to build PUT requests, and specifically emphasize that in the request body, in addition to setting is_private to False, we also need to specify fork_policy as allow_forks to resolve common 400 Bad Request errors and ensure that the operation is successful.
Aug 04, 2025 pm 07:21 PM
This tutorial is intended to solve the problem that HTML format content cannot be saved to the database correctly when using rich text editors such as TinyMCE or CKEditor. We will introduce in detail how to correctly obtain the complete HTML content of the editor through JavaScript, and combine it with the PHP backend for safe and effective processing and storage, including client data extraction, server data reception, and crucial security protection measures to ensure that rich text content is complete and safely persisted.
Aug 04, 2025 pm 07:15 PM
This article aims to solve the common problem encountered by Mockito Spy in testing: Spy's pile value cannot take effect when production code creates an object instance on its own. The core reason is that the Spy instances in the test code are not used by production code. The solution is to adopt the dependency injection mode, pass the dependency object as a parameter, rather than create it inside the method, so as to ensure that Spy instances can be passed in the test, realize the effective application of pile values, and improve the testability of the code.
Aug 04, 2025 pm 07:12 PM
For common problems in which images are occluded or cropped during card hover effect, this tutorial will deeply analyze its root cause, namely CSS's overflow: hidden, z-index, and positioning context. By adjusting the HTML structure, using position: absolute and z-index reasonably, and combining pointer-events attributes, ensure that the image remains visible and located on the top level in any interactive state.
Aug 04, 2025 pm 07:09 PM
This article aims to solve the problem that the stub method is not executed as expected when using Mockito spy. The core reason is that production code directly instantiates dependencies rather than using spy objects created in tests. The article will elaborate on this common misunderstanding in detail and provide a solution to decoupling through dependency injection, thereby effectively improving the testability and modularity of the code.
Aug 04, 2025 pm 07:06 PM
This article details how to change a private repository to a public repository using the Bitbucket REST API. In response to common 400 Bad Request errors, the article points out that the problem is the lack of fork_policy parameter and provides complete Python sample code to guide readers to correctly set repository visibility and forking policies to achieve automated management.
Aug 04, 2025 pm 07:03 PM
