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Software Development
Introduction to Apache Kylin
In the era of big data analytics, fast query performance over massive datasets has become an essential requirement. Traditional relational…
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Core Java
Objenesis Hello World Example
In Java, object instantiation typically involves invoking a constructor using the new keyword or reflective instantiation via Constructor.newInstance(). However, these…
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Core Java
How to Use Avro to Serialize and Deserialize Dates
Working with dates and timestamps in data serialization can be tricky, especially when consistency and precision matter. Avro, a popular…
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Software Development
Performing a ZooKeeper Status Check via CLI
Apache ZooKeeper is a centralized service that facilitates configuration management, naming, distributed synchronization, and group coordination in distributed systems. It…
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Core Java
Running Java Programs in the Background
Running a Java program in the background is crucial for keeping applications or services active even after terminal sessions end.…
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Enterprise Java
JSTL forEach Index Values Example
JSTL is a powerful tool for simplifying Java-based web applications, particularly when working with dynamic data in JSP pages. One…
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Enterprise Java
Send Multiple Headers with Spring WebClient
In modern microservices and cloud-native applications, sending metadata with HTTP requests is a common need. If you have worked with…
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Core Java
Fixing Java DateTimeParseException with LocalDateTime
When working with Java’s java.time package, we sometimes encounter the DateTimeParseException with the message:“Unable to obtain LocalDateTime from TemporalAccessor”.This error…
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Core Java
Java Currency Code Symbol Mapping Example
In financial applications, e-commerce platforms, or internationalization (i18n) support, you often need to convert a currency code (like "USD", "EUR",…
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