When I code something in Java, I am always worrying about NullPointerException. As a developer, I should provide error-free code. For some projects, I have worked in Javascript, I saw one beautiful/amazing thing in javascript. That is we can check to execute some function if the value is not…

Everyone knows how crucial is the starting point to add up a new piece to the head. If the new piece is Kafka then absolutely, you may confuse to start learning since there are so much information and ideas on the internet around Kafka. I will be pretty sure…

Whenever we need to analyze the time complexity of a particular operation, most of the time, we go with worst-case time analysis. Worst-case time analysis We find where the maximum number of code executions(code-wise) is executed for the given operation and calculate for n number of operations. When we need to find…

Veracode scanner is able to find the log forging attack. I recommend you scan your application with a Veracode scanner before going to production to ensure your application security. Why its an issue Writing untrusted data into a log file allows an attacker to forge log entries or inject malicious content into log files. Corrupted…

Reactive Streams Specification has four interfaces to talk in a reactive way between the applications. Four Interfaces are Publisher Subscriber Subscription Processor Basically, when we need to consume data then we will act as subscribers. and there will be a source that acts as a publisher. We have to…

In some cases, we need to do multiple if-else conditions like the above. Someone may prefer to go with a switch case, but it is not going to give clean and robust code. So How can we remove these multiple if-else conditions? We can do it with a map. For the String literals, you can use the…

Before jumping into Monitor, we need to understand two things. Mutual exclusion When a process/thread is executing its critical section no other processes are allowed to execute its critical section. (Each process has a code segment called “Critical section” in which shared data is accessed.) 2. Synchronisation When…

This is not a traditional spring Kafka consumer setup where the consumer actively listening to a particular topic. Kafka Customer can retrieve the message from the specified offset of the topic. Why we need Spring Kafka has a pattern to listen to topics actively(Kafka listeners). that’s what we need most of the time…