Java Exceptions

Learn to solve the Java compiler exception “Java class file has wrong version” while migrating an application to Spring 6 or Spring boot 3.

In Java exception handling, throw keyword is used to explicitly throw an exception from a method or constructor. And throws keyword is used to declare the list of exceptions that may be thrown by that method or constructor. 1. Throw Let us learn basic things about throw keyword before going …

I encountered this exception while building spring MVC file upload example. The error stacktrace looks like this: Solution You have incorrect version of apache commons-fileupload. To solve this error, you correct version 1.2.1. This will solve your error. Happy Learning !!

If you are working on a web application and you define the taglibs in your web.xml file then you may encounter this exception. The exception trace in server console looks like this when you start up the server. Solution You just need to confirm the allowed tags by web.xml confirming …

Learn the difference between checked vs unchecked exceptions in Java, with simple explanations and examples. Learn Java exception handling best practices.

Learn to handle the exceptions thrown from the instance or static initializer blocks in Java by declaring them in constructors.

Reason When you are working with java libraries that internally depend on cglib, then it’s very normal to encounter the below error: This error is due to an incompatible version of cglib with additional jar files in your project, such as asm. Solution The solution is very easy. Just place …

Java NullPointerException (NPE) is an unchecked exception and extends RuntimeException. NullPointerException doesn’t force us to use a try-catch block to handle it. NullPointerException has been very much a nightmare for most Java developers. It usually pop up when we least expect them. I have also spent a lot of time …

Suppressed exceptions, as name suggest, are exceptions thrown in the code but were ignored somehow. If you remember try-catch-finally block execution sequence and how they return any value or exceptions, you will recall that exceptions thrown in finally block are suppressed if an exception is thrown in try block also. …

In this Java tutorial, learn about asynchronous and synchronous exceptions in Java. Also, learn how they are different with checked and unchecked exceptions. 1. Asynchronous and synchronous exceptions Normally Java differentiates the exceptions into two categories on basis of “timing” when they are discovered. These categories are checked and unchecked …