Fixing ClassCastException: java.math.BigInteger cannot be cast to java.lang.Integer

The ClassCastException occurs when Java attempts to cast an object of one type to another, incompatible type. One common occurrence…

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Fixing Spring Boot H2 Exception: “Schema not found”

The H2 “Schema Not Found” exception is a common issue that occurs when using Spring Boot with an H2 in-memory…

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Convert Month Name to Number in Java

When dealing with months in Java, we often use numbers because they provide a consistent format that works well across…

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Create a Retrieval-Augmented Generation (RAG) App with Vector Stores and Spring AI

Vector databases often work as memory for AI apps, especially those using large language models (LLMs). They allow for semantic…

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Upload Files With GraphQL in Java

File uploads are a common feature in modern applications, and GraphQL can handle them with some customization. GraphQL doesn’t natively…

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Spring AI Structured Output Example

Spring AI offers a seamless integration for AI-driven applications, especially when interacting with large language models (LLMs). One key feature…

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Using Spring AI Structured Output: List, Map, and Bean Converters

In Spring AI, structured output converters play a crucial role in handling the responses returned by AI models. Specifically, MapOutputConverter,…

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Testcontainers JDBC Support

Testcontainers is a powerful library designed to simplify the testing of database interactions, especially when dealing with different environments and…

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Maven Spotless Plugin for Java

Maintaining a consistent code style across a project is crucial for readability, collaboration, and long-term maintainability. The Maven Spotless Plugin…

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