Logging Exceptions in Java with Log4j and SLF4J

🚀 Observer Pattern Example (Java) This example demonstrates the Observer pattern. The `Subject` class maintains a list of `Observer` objects and notifies them when its state changes. The `ConcreteObserver` class implements the `Observer` interface and updates its state when notified by the `Subject`. The `Subject` and `Observer` classes are loosely coupled, meaning that they can be changed independently of each other. This promotes flexibility and maintainability. Learn more on our app: https://lnkd.in/gefySfsc #Java #JavaDev #OOP #Backend #professional #career #development

Spring Boot Silent Failures — Hardest bugs to debug 😵 Sometimes your app fails… but no error ❌ Why? 👉 Exceptions swallowed internally 👉 Async methods not logging errors 👉 Improper logging config 💡 Example: @Async method throws exception 👉 You never see it 😱 Solution 👇 ✔ Use AsyncExceptionHandler ✔ Proper logging setup ✔ Enable debug logs when needed ⚠️ Biggest mistake: Ignoring logs 👉 Logs = your only truth in production Senior engineers debug logs, not code 🔥 #SpringBoot #Java #Debugging

🚀 Static Members (Java) Static members (variables and methods) belong to the class itself, rather than to individual objects of the class. They are shared by all instances of the class. Static variables are initialized only once, when the class is loaded. Static methods can be called directly on the class without creating an object. Static members are useful for representing data or behavior that is common to all instances of a class, such as constants or utility functions. Learn more on our app: https://lnkd.in/gefySfsc #Java #JavaDev #OOP #Backend #professional #career #development

Java has successfully transformed from a legacy system language into a modern development powerhouse. With continuous updates and strong community support, it enables businesses to modernize applications while preserving stability and reliability. Net Stream IT INC #Java #Modernization #LegacySystems #TechEvolution #SoftwareEngineering #ITSolutions

🚀 flatMap Operation (Java) The `flatMap` operation is an intermediate operation that transforms each element of a stream into a stream of zero or more elements, and then flattens these streams into a single stream. It's useful when you have a stream of collections and you want to process the individual elements within those collections. The `flatMap` operation takes a function that returns a stream for each input element. It is frequently used to avoid nested loops. #Java #JavaDev #OOP #Backend #professional #career #development

🚀 Preventing Deadlocks with Resource Ordering (Java) Resource ordering is a technique to prevent deadlocks by ensuring that all threads acquire resources in the same order. By establishing a consistent order, you eliminate the possibility of circular dependencies. For example, if threads A and B both need resources X and Y, they should always acquire X before Y. This prevents A from holding X while waiting for Y, and B from holding Y while waiting for X, which could lead to a deadlock. Resource ordering requires careful planning and coordination. #Java #JavaDev #OOP #Backend #professional #career #development

🚀 Terminal Stream Operations: Collect (Java) The `collect()` operation is a terminal operation that gathers the elements of a stream into a collection or other data structure. It takes a `Collector` as an argument, which specifies how the elements should be collected. Common collectors include `Collectors.toList()`, `Collectors.toSet()`, and `Collectors.toMap()`. The `collect()` operation triggers the execution of the stream pipeline. Learn more on our app: https://lnkd.in/gefySfsc #Java #JavaDev #OOP #Backend #professional #career #development

𝗧𝗵𝗿𝗲𝗮𝗱𝗣𝗼𝗼𝗹 𝗤𝘂𝗲𝘂𝗲 𝗙𝗨𝗟𝗟 — 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 Under load, queues fill up fast 👇 Tasks > processing → queue becomes 𝗙𝗨𝗟𝗟 👉 𝗪𝗵𝗮𝘁 𝗵𝗮𝗽𝗽𝗲𝗻𝘀? • Threads scale till maxPoolSize • Then 𝗥𝗲𝗷𝗲𝗰𝘁𝗶𝗼𝗻 𝗣𝗼𝗹𝗶𝗰𝘆 kicks in 💡 𝗜𝗺𝗽𝗮𝗰𝘁 • AbortPolicy→ failures • CallerRunsPolicy→ slower but stable 💡 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 • Choose policy wisely • Monitor queue size • Focus on 𝗯𝗮𝗰𝗸𝗽𝗿𝗲𝘀𝘀𝘂𝗿𝗲 💡 𝗞𝗘𝗬 𝗧𝗔𝗞𝗘𝗔𝗪𝗔𝗬 ➡️ Handle overload gracefully > normal load #Java #Multithreading #Concurrency #SystemDesign #BackendDeveloper #Tech

🚀 The Enhanced for Loop (for-each) (Java) The enhanced 'for' loop, also known as the 'for-each' loop, provides a simplified way to iterate over arrays and collections. It automatically iterates through each element in the collection without requiring explicit index management. This makes the code more readable and less prone to errors. However, it doesn't provide access to the index of the current element. #Java #JavaDev #OOP #Backend #professional #career #development

🚀 Executors and Thread Pools (Java) Executors provide a higher-level abstraction for managing threads compared to directly creating and managing `Thread` objects. Thread pools are a key component of executors, allowing you to reuse threads to execute multiple tasks, reducing the overhead of creating new threads for each task. Java's `java.util.concurrent` package offers various executor implementations like `ThreadPoolExecutor`, `FixedThreadPool`, and `CachedThreadPool`. Using executors improves performance, resource utilization, and application responsiveness by efficiently managing thread lifecycle and task execution. Learn more on our app: https://lnkd.in/gefySfsc #Java #JavaDev #OOP #Backend #professional #career #development