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No. Class. Def. Found. Error in Java J2. EEI know how frustrating is to see Exception in thread main java. No. Class. Def. Found. Error,  which is a manifestation of No. Class. Def. Found. Error in Java. I have seen it a couple of times and spent quite a lot time initially to figure out what is wrong, which class is missing etc. The first mistake I did was mingling java. Download Videos On Vimeo. Class. Notfound. Exception and No. Class. Def. Found. Error, in reality, they are totally different, and my second mistake was using trial and error method to solve this java. SSZLC2_7.0.0/com.ibm.commerce.payments.events.doc/images/pspwsclient.png' alt='Sample Websphere Ear File' title='Sample Websphere Ear File' />No. Class. Def. Found. Errorinstead of understanding why No. Class. Def. Found. Sample Websphere Ear File' title='Sample Websphere Ear File' />Error is coming, what is the real reason behind No. Class. Def. Found. Error and how to resolve this. In this Java tutorial, I have tried to rectify that mistakes and uncover some secrets of No. Class. Def. Found. Error in Java and will share my experience around it. No. Class. Def. Found. SSAW57_8.0.0/com.ibm.websphere.nd.doc/info/ae/ae/images/jws_model.gif' alt='Sample Websphere Ear File' title='Sample Websphere Ear File' />Sample Websphere Ear File1. BIRAWBI 1180982 How do you cache scheduled documents to the repository for f 04. BIRAWBI 1180992 You are unable to access the Administrator. Oracle WebLogic Server Issues. This chapter describes issues associated with Oracle WebLogic Server. It includes the following topics JDK 7 Certification. Java2s. com Emailinfo at java2s. Demo Source and Support. All rights reserved. Error is not something which cannot be resolved or hard to resolve its just its manifestation which puzzles most of Java developer. Retail Man Pos 1.90. This is the most common error in Java development along with java. Out. Of. Memoroy. Error Java heap space and java. Out. Of. Memory. Error Perm. Gen space Anyway letss see Why No. Class. Def. Found. Error comes in Java and what to do to resolve No. Class. Def. Found. Error in Java. What is the reason of No. Class. Def. Found. Error in Java No. Class. Def. Found. Error in Java comes when Java Virtual Machine is not able to find a particular class at runtime which was available at compile time. For example, if we have a method call from a class or accessing any static member of a Class and that class is not available during run time then JVM will throw No. Class. Def. Found. Error. Its important to understand that this is different than Class. Not. Found. Exceptionwhich comes while trying to load a class at run time only and the name was provided during runtime, not at compile time. Many Java developer mingles this two Error and gets confused. In short, No. Class. Def. Found. Error will come if a class was present during compile time but not available in java classpath during runtime. Normally you will see below line in log when you get No. Class. Def. Found. Error Exception in thread main java. No. Class. Def. Found. Error. Exception in thread main simply indicate that its main thread which is not able to find a particular class it could be any thread so just dont worry. The difference between this error coming in the main thread and another thread is when Exception in thread main comes program crashes or shut itself down as opposed to other thread in which case your program will continue to run. If you are really curious and think that you understand how class loading works, I suggest you try some puzzles from Joshua Blochs Java Puzzlers, it has got some really tricky questions to test your knowledge. The difference between java. No. Class. Def. Found. Error and Class. Not. Found. Exception in Java. Many times we confused ourselves with java. Class. Not. Found. Exception and java. No. Class. Def. Found. Error, though both of them related to Java Classpath they are completely different to each other. Class. Not. Found. Exception comes when JVM tries to the load a class at runtime dynamically means you give the name of the class at runtime and then JVM tries to load it and if that class is not found in the classpath it throws java. Class. Not. Found. Exception. While in the case of No. Class. Def. Found. Errorthe problematic class was present during Compile time and thats why the program successfully compiled but not available during runtime for any reason. No. Class. Def. Found. Error is easier to solve than Class. Not. Found. Exceptionin my opinion because here we know that Class was present at build time, but it totally depends upon environment if you are working in the J2. EE environment than you can get No. Class. Def. Found. Error even if the class is present because it may not be visible to the corresponding class loader. See my post No. Class. Def. Found. Error vs Class. Not. Found. Exception in Java for more details. How to resolve java. No. Class. Def. Found. Error in Java. 2 You might be running your program using jar command and class was not defined in manifest files Class. Path attribute. 3 Any start up script is overriding Classpath environment variable. Because No. Class. Def. Found. Error is a subclass of java. Linkage. Error it can also come if one of it dependency like native library may not available. Check for java. lang. Exception. In. Initializer. Errorin your log file. No. Class. Def. Found. Error due to the failure of static initialization is quite common. If you are working in J2. EE environment than the visibility of Class among multiple Classloader can also cause java. No. Class. Def. Found. Error, see examples and scenario section for detailed discussion. We will now see a couple of examples and scenarios when java. No. Class. Def. Found. Errorhas come before and how its been resolved. This can help you to troubleshoot the root cause of No. Class. Def. Found. Error in Java application. No. Class. Def. Found. Error in Java Example and Scenarios. A simple example of No. Class. Def. Found. Erroris class belongs to a missing JAR file or JAR was not added into classpath or sometimes jars name has been changed by someone like in my case one of my colleagues has changed tibco. No. Class. Def. Found. Errorand I were wondering whats wrong. The class is not in Classpath, there is no sure shot way of knowing it but many times you can just have a look to print System. Just try to run with explicitly classpath option with the classpath you think will work and if its working then its a sure short sign that someone is overriding java classpath. No. Class. Def. Found. Error in Java due to Exception in Static Initializer block. This is another common reason of java. No. Class. Def. Found. Error, when your class performs some static initialization in a static block like many Singleton classes initialized itself on the static block  to take advantage of thread safety provided by JVM during the class initialization process, and if static block throws an Exception, the class which is referring to this class will get Noclass. Def. Found. Error in Java. If you look at your log file you should watch for any java. Exception. In. Initializer. Errorbecause that could trigger java. No. Class. Def. Found. Error Could not initialize class on other places. Like in below code example, During class loading and initialization User class are throwing Exception from static initializer block, which trigger Exception. In. Initializer. Errorduring first time loading of User class in response to new User call. Later rest of new User are failing as java. No. Class. Def. Found. Error. the situation gets worst if original Exception. In. Initializer. Error, which is root cause here is silently eaten by any code. Code Example of No. Class. Def. Found. Errordue to Static block Exception Java program to demonstrate how failure of static initialization subsequently causejava. No. Class. Def. Found. Error in Java. author Javin Paulpublicclass No. Class. Def. Found. Error. Due. To. Static. Init. Failure publicstaticvoid mainString argsListlt User users new. Array. Listlt User 2 forint i0 ilt 2 itryusers. UserString. value. Ofi will throw No. Class. Def. Found. ErrorcatchThrowable tt. Stack. Trace         class Userprivatestatic. String USERID get. Web Application Administration Guide, Fourth Edition.

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