What is the difference between noclassdeffounderror and classnotfound exception

David Lantos 4 4 silver badges 8 8 bronze badges. Sanjiv Jivan Sanjiv Jivan 1, 17 17 silver badges 18 18 bronze badges. It i funny that this is exactly correct answer voted the last. Even -1 before I voted. NoClassDefFoundError means the. Isn't this answer contradicting with answer form coobird?

I tried similar example of Static block. Now from Main method of third class when I create object of Class1. The rror is thown as follws "Exception in thread "main" java.

So it exactly mentiones which class it did not found i. So it is contrary to this answer. Stephen C k 90 90 gold badges silver badges bronze badges. Here's what happens: First attempt new b : java. If this is useful, perhaps you could show the results.

Neither -verbose:class nor -verbose:jni give any additional output relevant to the missing class. Thanks for trying it out, even if the result is disappointing. I have since found out that -verbose:class:jni is wrong: one has to specify two separate options: -verbose:class -verbose:jni. ClassNotFoundException: Test at java. KingFeming KingFeming 1, 10 10 silver badges 21 21 bronze badges.

Donal Fellows Donal Fellows k 18 18 gold badges silver badges bronze badges. Both are run time exceptions. Dinesh Dinesh 1, 9 9 silver badges 6 6 bronze badges. On the other hand, NoClassDefFoundError is thrown when the actual physical representation of the class - the. In this case, the directly referenced class might have been located and loaded, but the dependent class is not available or cannot be loaded.

This is a scenario where the directly referenced class can be loaded via a Class. This indicates a failure in linkage.

Vineet Reynolds Vineet Reynolds Upvote for mentioning 'the name in the class file does not match the requested name'. This is a quite common cause. Lawakush Kurmi Lawakush Kurmi 2, 1 1 gold badge 13 13 silver badges 27 27 bronze badges. Not crystal clear. This is about the either the JAR not being present in the classpath, or the wrong version of the JAR being on the classpath. And spelling errors. And sigh since you posted your information as a funky graphic, we can't fix this. ClassNotFoundException is a checked exception which occurs when an application tries to load a class through its fully-qualified name and can not find its definition on the classpath.

ClassNotFoundException comes up when there is an explicit loading of class is involved by providing name of class at runtime using ClassLoader. It occurs when JVM can not find the definition of the class while trying to Instantiate a class by using the new keyword OR Load a class with a method call. NoClassDefFoundError is a result of implicit loading of class because of a method call from that class or any variable access.

Premraj Premraj Anton Shchastnyi Anton Shchastnyi 3, 3 3 gold badges 18 18 silver badges 23 23 bronze badges. Add one possible reason in practise: ClassNotFoundException: as cletus said, you use interface while inherited class of interface is not in the classpath. This exception also occurs when you have two class loaders and if a ClassLoader tries to access a class that is loaded by another classloader in Java.

You must be wondering that what actually is classloader in Java. The Java Runtime System does not need to know about files and files systems because of classloaders. Skip to content. Change Language. Related Articles. Table of Contents. It is not checked exception. Checked exception are the exceptions which compiler can detect at compile time.

ClassNotFoundException is a checked exception but suppose the class is not found at the runtime this exception will be thrown. ClassNotFoundException will not occur at run time because compiler write code to check it at run time and asked us to handle that. It is a checked exception because you know the limited number of methods can throw that exception. And it becomes a good way to track if a method calls those particular methods, as it will also throw that exception.

By the signature, ClassNotFoundException is a checked exception, which has to be caught and handled…. Which of them happens when the class was found OK but something blew up during initialization, like. HI Admin, Please keep older version of page design. Now its really hard to search and link on ur site. Even you have not given serach option. As you can see in Oracle doc java. Object java. Sign Out View Profile. Over 2 million developers have joined DZone. ClassNotFoundException vs.

This quick tutorial will help you learn to distinguish between two similar, but different problems that can crop up in your code. Like Join the DZone community and get the full member experience. Join For Free. ClassNotFoundException ClassNotFoundException is a runtime exception that is thrown when an application tries to load a class at runtime using the Class. ClassNotFoundException: oracle.