Java Runtime Error Noclassdeffounderror
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How To Resolve Noclassdeffounderror In Java
them; it only takes 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 noclassdeffounderror vs classnotfoundexception of this? java noclassdeffounderror share|improve this 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 noclassdeffounderror android studio just remember messing this up a few times. –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
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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 http://stackoverflow.com/questions/34413/why-am-i-getting-a-noclassdeffounderror-in-java a minute: Sign up How to Solve java.lang.NoClassDefFoundError? up vote 80 down vote favorite 22 I'm pretty new to Java, and I've just started learning about packages in Java. I've tried both the example in Oracle's Java Tutorials. They both compile fine, but at run-time, both come up with this error: Exception in thread "main" java.lang.NoClassDefFoundError: graphics/shapes/Square at Main.main(Main.java:7) Caused by: java.lang.ClassNotFoundException: http://stackoverflow.com/questions/17973970/how-to-solve-java-lang-noclassdeffounderror graphics.shapes.Square at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 1 more I think I might have the Main.java file in the wrong folder. Here is the directory hierarchy: graphics ├ Main.java ├ shapes | ├ Square.java | ├ Triangle.java ├ linepoint | ├ Line.java | ├ Point.java ├ spaceobjects | ├ Cube.java | ├ RectPrism.java And here is Main.java: import graphics.shapes.*; import graphics.linepoint.* import graphics.spaceobjects.*; public class Main { public static void main(String args[]) { Square s = new Square(2,3,15); Line l = new Line(1,5,2,3); Cube c = new Cube(13,32,22); } } What am I doing wrong here? Any help would be appreciated. Thanks. UPDATE Thanks for the answers. They really helped. After I put put the Main class into the graphics package (I added package graphics; to it), set the classpath to "_test" (folder containing graphics), compiled it, and ran it using java graphics.Main (from the command line), it worked. Really late UPDATE #2 I wasn't using Eclipse (just Notepad++ and the JDK), and the above update solved my problem. However, it see
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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! A friend of mine wanted to start to learn java, and I wanted to 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 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 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, CLASSP