Error 500 Java.lang.noclassdeffounderror
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up HTTP Status 500 - java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl [duplicate] up vote 0 down vote favorite This question already has an answer here: How do I import the javax.servlet API in my Eclipse project? 12 answers When I try to browse "localhost:8080" on myeclipse, I get the following error: type Exception report message java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl description The server encountered an internal error that prevented it from fulfilling this request. exception javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) root cause java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1568) org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:747) org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:954) org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376) org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428) org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434) org.apache.jasper.compiler.Node$Root.accept(Node.java:475) org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376) org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1795) org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217) org.apache.jasper.compiler.Compiler.compile(Compiler.java:373) org.apache.jasper.compiler.Compiler.compile(Compiler.java:353) org.apache.jasper.compiler.Compiler.compile(Comp
This Site Careers Other all forums Forum: Object Relational Mapping 500 Internal Server Error java.lang.NoClassDefFoundError Kinnaree Patel Ranch Hand Posts: 33 posted 7 years ago Hi friends, The problem I am facing is a little wierd.... When I try running my application on Live, I get 500 Internal Sever Error, but when I try running the same thing on Local or UAT machines, it works fine. Also, sometimes the application works fine, but if the browser window remains open for a while, say about 2 3 mins, it gives me 500 Internal Server Error. http://stackoverflow.com/questions/16624487/http-status-500-java-lang-noclassdeffounderror-could-not-initialize-class-org Can it be something to do with hibernate session? Also , the error comes when code reaches at Query queryObject = getSession().createQuery(queryString); i.e when getSession is encountered... Does anyone over here have any idea about this? Cameron Wallace McKenzie author and cow tipper Saloon Keeper Posts: 4968 1 I like... posted 7 years ago You 500 error is just what is being https://coderanch.com/t/450438/ORM/databases/Internal-Server-Error-java-lang reported back to the browser. It basically tells the browser the app server messed up. Check the logs on the app server for some better messages. You should see some type of exception in the logs. Which server are you using for deployment? -Cameron McKenzie Kinnaree Patel Ranch Hand Posts: 33 posted 7 years ago Cameron Wallace McKenzie wrote: Check the logs on the app server for some better messages. You should see some type of exception in the logs. Which server are you using for deployment? -Cameron McKenzie The worst thing is I get nothing in the logs... So I am even more confused.... We use OC4J for deployment... Paul Sturrock Bartender Posts: 10336 I like... posted 7 years ago It is difficult to help without any logging. Check you logging configuration and your code. Are you throwing away the exceptiojn? Or redirecting the lofgging? JavaRanch FAQ HowToAskQuestionsOnJavaRanch Kinnaree Patel Ranch Hand Posts: 33 posted 7 years ago Paul Sturrock wrote:Are you throwing away the exceptiojn? Or redirecting the lofgging? Yes... I am handling it using log4j... and it logs every exception except
in Java J2EE I know how frustrating is to see Exception in thread "main" java.lang.NoClassDefFoundError,which is a manifestation of NoClassDefFoundError in Java. I have seen it a couple of times and spent quite a lot time initially to figure http://javarevisited.blogspot.com/2011/06/noclassdeffounderror-exception-in.html out what is wrong, which class is missing etc. The first mistake I did https://developer.salesforce.com/forums/?id=906F00000009CYrIAM was mingling java.lang.ClassNotfoundException and NoClassDefFoundError, in reality, they are totally different, and my second mistake was using trial and error method to solve this java.lang.NoClassDefFoundError instead of understanding why NoClassDefFoundError is coming, what is the real reason behind NoClassDefFoundError and how to resolve this. In this Java tutorial, I have tried to rectify that mistakes and uncover some error 500 secrets of NoClassDefFoundError in Java and will share my experience around it. NoClassDefFoundError is not something which cannot be resolved or hard to resolve it's just its manifestation which puzzles most of Java developer. This is the most common error in Java development along with java.lang.OutOfMemoroyError: Java heap space and java.lang.OutOfMemoryError: PermGen space Anyway lets's see Why NoClassDefFoundError comes in Java and what to do to resolve NoClassDefFoundError in Java. What is error 500 java.lang.noclassdeffounderror the reason of NoClassDefFoundError in Java? NoClassDefFoundError 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 NoClassDefFoundError. It's important to understand that this is different than ClassNotFoundException which 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, NoClassDefFoundError 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 NoClassDefFoundError: Exception in thread "main" java.lang.NoClassDefFoundError 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 don't 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
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