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Questions tagged [classnotfoundexception]

The Java exception thrown when an application tries to load a class by name but is not able to find the class.

The Java exception thrown when an application tries to load a class by name. Usually raised by one of:

  • the forName(String) method in class Class
  • the findSystemClass(String) method in class ClassLoader
  • the loadClass(String) method in class ClassLoader

when no definition for the class with the specified name could be found in the .

Don't confuse it with , it's a different kind of error, see the following links for more details:

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Java 7 update 55 JacORB error when running via WebStart

Since updating to Java 7 update 55, I'm not able to run my WebStart java application. This application worked fine under Java 7 update 51 when launched via WebStart. It also works with update 55 when launched outside of WebStart. Any suggestions for…
jasg
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Tomcat Mapper class not found

I am creating a web app and at the moment I'm trying to get a tomcat server to run. However I get this error message when ran from the cmd line. Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tomcat/uti …
matt
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Getting ClassNotFoundException on code: "Class.forName("com.microsoft.sqlserver.jdbc.SqlServerDriver");"

This is my first Java application and I'm completely inexperienced with Java and NetBeans. I have been trying to connect to sql and get some records for 2 days. The problem is about jdbc driver, let me explain. I have downloaded sqljdbc driver and…
user2708377
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runtime error: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

I am new to mysql and jdbc and I am getting the error in this title. I have been searching all day and cannot find a solution that works for me. What I have tried: uninstall/reinstall mysql, copy paste mysql-connector-java-5.1.25-bin.jar and…
user2669813
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Unable to instantiate activity component when running android example code

I am learning the tutorial from the android web site. But when I run the application, it prompts Unable to instantiate activity component, something about the classNotFoundException. But in the manifext.xml file the MainActivity was registered. I…
Jolin
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Java Class.forName() from distant directory

I am currently loading Java classes using Class.forName() to load it. clazz = Class.forName("interfaces.MyClass"); But now I want to load classes from different directory, I have tried to set classpath by clazz = Class.forName("-cp \"C:/dir\"…
kajacx
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java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet, tomcat doesn't see javaee-api-7.0-b83.jar

I am trying to run sample guessnumber-jsf from Java EE tutorial. It is here: https://svn.java.net/svn/javaeetutorial~svn There is no dependencies in pom.xml. So output file has no .jar file. When I try to put javaee-api-7.0-b83.jar inside…
Stepan Yakovenko
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ClassNotFoundException: twitter4j.conf.PropertyConfigurationFactory : Android

If I don't run pro-guard on my project, everything is fine but if I run pro-guard and install .apk in device, I am getting above error. I tried adding following lines in proguard-android.txt file -keep public class…
Braj
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Applet hidden classnotfound exception

I'm developing an applet that behaves strangely: this is not the usual "I can't start my applet in the browser" problem, but something more subtle. The applet consists into a jtabbedpane with 8 tabs, each of which does some data manipulation in the…
Andrea
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ClassNotFoundException: org.dom4j.DocumentException

I am trying to debug (F11 on Eclipse) a java GUI application I inherited but while the application runs fine (minus a tiny fix I need to apply) outside of the Eclipse IDE, it produces the following exception when launched from Eclipse (either F11 or…
Withheld
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ClassNotFoundException for Activity after signing apk

While I'm testing the debug version of my app — it's OK. After I sign it for Google Play release — it starts to FC with the following exception: java.lang.RuntimeException: Unable to instantiate activity…
artem
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java.lang.ClassNotFoundException in loader dalvik.system.PathClassLoader at app launch

I've got a pp that was made by a different company to make some updates on it but I can't get it going. I've struggled with this problem for nearly 10h straight now and have gone through a lot of threads suggesting different solutions for this error…
PaperThick
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Android Google Maps ClassNotFoundException

I'm creating my first Google Maps app, but I've run into some trouble and I can't figure out why. I'm getting a ClassNotFoundException. I'm new to Android in general, but this error has me stumped. Here's my manifest.
Logan Gore
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java.lang.ClassNotFoundException: com.sun.faces.config.ConfigureListener

I am working on learning Java, Spring MVC and Eclipse. I am working through a book right now and trying to get the first Spring MVC example to run. When I run it from Eclipse, I get this error: INFO: TLD skipped. URI:…
Sam Carleton
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Broken Eclipse project - classNotFoundException - could not find main class

I have a project I've been developing in Eclipse 3.7.2 on Ubuntu 12.04. Recently, I've restructured the class hierarchy which involved moving classes between packages. I did not move my main class ("ob3.converter.Converter"), which contains my…
Alex McMillan
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