Java

There are several common reasons why Java applications cannot find resource files, including incorrect file paths, classpath issues, and packaging problems. Java uses the classpath to locate resources, so ensuring that resource files are correctly placed and referenced is crucial for successful access.

Many new Java developers are surprised when a method quietly modifies an object but leaves a primitive variable untouched. Java parameter passing is always by value, but understanding how that works with objects versus primitives will help you avoid unexpected behavior.

Without having to radically change the Beans in your Spring Boot application, you can significantly speed up Spring bean startup times, just by using Annotations such as @Lazy, @Async, and @Profile.

In multithreaded Java applications, managing shared data safely is a common challenge. ThreadLocal offers a clean solution by allowing each thread to maintain its own independent copy of a variable, reducing the need for complex synchronization.

Handling an ExecutionException in Java requires understanding its root cause and applying the right strategy to ensure smooth execution in concurrent environments. Practical solutions include unwrapping the exception with getCause() and implementing structured error handling.

Caching JAXB instances can significantly improve performance in Java applications. It reduces the overhead of creating new instances and allows for better resource management. See benchmarks comparing caching vs. non-caching approaches.

When you continuously submit tasks to an ExecutorService, you may run out of threads. But you can continue to submit tasks, and the ExecutorService will queue them up until a thread becomes available.

Keeping track of resources is difficult in multi-threaded applications. Java has several ways to track resources, such as using synchronized blocks, atomic counters, and semaphores.

Java enums are more than just simple constants. By using constructors in enums, they can eliminate the need for cumbersome if-then statements, and attach meaningful attributes to each constant, making the code more maintainable and expressive.

Handling null values in Java has long been a source of bugs and NullPointerExceptions. Use Java Optionals to safely manage null values, making your code more robust and less error-prone.