Engineering With Java: Digest #21
Curated and Hand Picked Java and Spring Blogs
In this Engineering With Java newsletter edition, we have hand-picked some interesting Java and Spring articles worth reading. These articles include topics such as parallel stream, JPA, Caching, OpenAI API, Java Security, Mockito etc.
I hope you will like the selections! If you, please consider sharing it, your support means a lot!
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1. When to Use a Parallel Stream in Java ?
Using a parallel stream in Java can significantly enhance program performance by leveraging multiple CPU cores for parallel processing. Key scenarios include large data sets, performance improvements, stateless operations, CPU-intensive tasks, non-interfering operations, and favorable fork-join pool characteristics.
2. Refresh and Fetch an Entity After Save in Spring Data JPA
The article discusses managing entities in Spring Data JPA, specifically focusing on saving, fetching, and refreshing entities. It covers setting up Spring Data JPA, defining entities, and using the save() method to persist data. Fetching entities can be done using methods like findById(), with insights on eager and lazy loading.
The article also explains the refresh() method to update stale entities and handling OptimisticLockException when concurrent modifications occur. This ensures robust and reliable entity management in applications.
3. Implement Two-Level Cache With Spring
Implementing a two-level cache in Spring can significantly improve the performance and scalability of an application. By combining a first-level in-memory cache and a second-level distributed cache, developers can ensure faster data access and reduced load on the database.
This approach particularly benefits applications with high read demands and relatively stable data. The first-level cache offers quick access to frequently used data, while the second-level cache provides a scalable solution for handling larger datasets and ensuring data consistency across multiple instances.
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4. Looking at Java 22: Multi-File Source-Code Programs
Java 22’s support for multi-file source code programs represents a significant step toward making Java more accessible and flexible. It simplifies the development workflow for both beginners and experienced developers by allowing for direct execution of complex, multi-file programs without the need for extensive setup.
This fosters an environment conducive to learning, rapid prototyping, and experimentation, aligning Java more closely with the ease-of-use found in other modern programming languages.
5. OpenAI API Client in Java
It walks through the process of setting up a Spring Boot application to call the OpenAI ChatGPT API, which generates responses based on given prompts. Key steps include configuring necessary dependencies, creating Data Transfer Objects (DTOs) for requests and responses, and handling API authentication with an API key.
The guide emphasizes the use of Spring Boot's capabilities to manage API requests and responses efficiently, providing practical examples and code snippets to facilitate implementation
6. Implement your primary key as a Record using an IdClass
This article explores implementing primary keys as records using IdClass in Java, particularly with Hibernate ORM 6.5.0 and above. This approach is efficient, providing immutability and built-in equals and hashCode methods. The primary key, modeled in an IdClass, must match the entity's primary key attributes.
Hibernate requires record fields to be in alphabetical order due to internal instantiation mechanisms. The article also covers working with these records and their limitations, especially in versions prior to Hibernate 6.5.0.
7. Easy Tips and Mistakes to Avoid for Java Security
The article provides practical tips for enhancing Java application security and highlights common mistakes to avoid. It covers topics such as using secure coding practices, managing dependencies securely, implementing proper authentication and authorization mechanisms, encrypting sensitive data, handling exceptions securely, and staying updated with security patches.
By following these tips and avoiding common pitfalls, developers can significantly improve the security posture of their Java applications.
8. How to Test Private Methods in Java
The article explains methods for testing private Java methods, which are tricky to access directly from outside the class. It suggests making them accessible to tests by changing their access level, using reflection to access them indirectly, or creating nested test classes or helper methods within the same class.
Each method has its pros and cons, such as reduced readability or potential performance overhead. The key is to choose the most suitable approach based on the project's needs while ensuring comprehensive test coverage without compromising code integrity.
9. Basics of Mocking Dependencies in Java Unit Tests with Mockito
This article provides a comprehensive introduction to mocking dependencies in Java unit tests using Mockito. By leveraging Mockito's capabilities to create mock objects and simulate dependencies, developers can write robust, isolated unit tests that focus on the behavior of individual components, ultimately improving code quality and maintainability.
10. Getting Started with JobRunr: Powerful Background Job Processing Library
This article serves as a comprehensive guide for developers interested in leveraging JobRunr for task scheduling and background processing in their Java applications. By providing detailed explanations, code examples, and integration tips, it aims to facilitate a smooth onboarding process and help developers harness the full potential of JobRunr for their projects.
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