No Class Definition Found Error In Linux
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Noclassdeffounderror Could Not Initialize Class
of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Exception in thread “main” java.lang.NoClassDefFoundError: HelloWorld up vote 4 down vote favorite 9 I've been working on this for about an hour and thumbing through Q&As on stackoverflow but I haven't found a proposed noclassdeffounderror vs classnotfoundexception solution to my problem. I'm sorry if this is a duplicate, but I couldn't find any duplicate question with an answer that solved my specific problem. I am trying to write and compile a java program from terminal for the first time (up until this point I have been using Eclipse for java and VIM for everything else, but I feel its time to switch entirely to VIM). Here is my current HelloWorld code: package main; public class HelloWorld { public static void main(String args[]) { System.out.println("Hello World!"); } } I compile and run using the following commands (specifying the classpath to ensure that isn't the problem): javac -cp "./" HelloWorld.java java -cp "./" HelloWorld This gives me the following error message: Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld (wrong name: main/HelloWorld) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:791) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:423) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:356) at sun.launcher.LauncherHelper.checkAndL
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How To Resolve Noclassdeffounderror In Java
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Java.lang.noclassdeffounderror Wrong Name
a minute: Sign up Why am I getting a NoClassDefFoundError in Java? up vote 238 down vote favorite 59 I am getting a NoClassDefFoundError when I run my Java application. What is typically the cause of this? java noclassdeffounderror share|improve this http://stackoverflow.com/questions/14132602/exception-in-thread-main-java-lang-noclassdeffounderror-helloworld question edited Apr 11 '14 at 10:38 Duncan 36.8k979128 asked Aug 29 '08 at 14:59 John Meagher 9,62294250 I believe it can also happen if you don't run your java program with the correct syntax. For instance, you have to call your class from the root bin folder with the full package name (ie. my.package.myClass). I'd be more specific if I could but I'm not much of a java guy. I just remember messing this up a few times. http://stackoverflow.com/questions/34413/why-am-i-getting-a-noclassdeffounderror-in-java –frank hadder Aug 29 '08 at 15:06 14 @BoltClock We need a canonical question to point the numerous duplicates to. Why can't this be it? –Raedwald Jun 29 '14 at 10:09 11 Have you considered changing the accepted answer so that the one the community finds more valuable is at the top? –Martin Smith Jan 18 '15 at 12:00 add a comment| 13 Answers 13 active oldest votes up vote 125 down vote accepted This is caused when there is a class file that your code depends on and it is present at compile time but not found at runtime. Look for differences in your build time and runtime classpaths. share|improve this answer answered Aug 29 '08 at 15:01 Mocky 4,10752023 1 I had this error happen when putting a source file under the wrong namespace/package. I figured I could just put it anywhere, and the compiler was happy. Turns out I should have been more diligent for runtime to be happy as well. –CenterOrbit Oct 21 '14 at 15:34 I had this error once when my server ran out of memory during a file upload. Every time I tried the upload, I'd get a different error. Eventually it told me I didn't have enough heap space. –James M. Lay Apr 25 at 7:47 This answer is not necessarily true and will be misleading to many people! See the better answer from Jared below. –Dave
3.5 and PHP 7 13 Must-Have WordPress SEO plugins in 2016 Emerging Trend Of Java EE Microservices Login CodeGravity Watch Your Visitors in Real-Time for FREE! Exception in thread "main" java.lang.NoClassDefFoundError >> Register as FREELANCE DEVELOPER for FREE! http://www.codegravity.com/blog/exception-in-thread-main-java-lang-noclassdeffounderror A friend of mine wanted to start to learn java, and I wanted to http://javarevisited.blogspot.com/2011/06/noclassdeffounderror-exception-in.html help him, so we created a simple Hello World example. public class Hello { public static void main(String argv[]) { System.out.println("Hello world !"); } } then, when you compile it: > javac Hello.javaand want to execute it:> java Hello Exception in thread "main" java.lang.NoClassDefFoundError: Hello We set the CLASSPATH and JAVA_HOME enviroment variable correctly, and the error in problem was still the same.. When we copied the Hello.class into a lib directory of JAVA_HOME, it worked, but not from the current directory !We tried different versions of java.. and do you know where this stupid problem is?in the CLASSPATH there should be:CLASSPATH=.;c:\programme\jboss\lib;c:\programme\j2sdk1.4.2_08\lib;c:\programme\j2sdk1.4.2_08\jre\lib; ...yes.. a dot .. it means, that it will search for classes bytecode in the current directory !you can also tell java to search the current directory noclassdeffounderror in java with the -classpath parameter> java -classpath . Hello Problems like this can really discourage java newbies, and that moment was very embarassing :) Problem: Basically, the Exception in thread "main" java.lang.NoClassDefFoundError: means, that the class which you are trying to run was not found in the classpath. Solution: you need to add the class or .jar file which contains this class into the java classpath. When you are running a java class from the command line, you need to add the dot (.) java YourSingleClass -cp . into the classpath which tells the JVM to search for classes in actual directory. If you are running a class from a .jar file, you need to add this jar file into the classpath: java org.somepackage.SomeClass -cp myJarWithSomeClass.jar Comments -1 #1 bhavin 2010-07-01 13:13 I tried setting in the PATH, CLASSPATH, JAVA_HOME, from going into the Environment variables, but it didnt worked.But then later i tried this....set classpath=%classpath%;.;by going into the folder where my java code is there, and it worked.Thanks a lot rishi :) Quote -16 #2 preeti 2010-07-08 21:18 m still not able to get it plz help Quote -7 #3 preeti 2010-07-08 22:04 hey it really helped methank u all guys Qu
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 out what is wrong, which class is missing etc. The first mistake I did 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 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 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 thre