classnotfoundexception

I am trying to compile UploadServlet servlet via apache tomcat 8.0.14. my web.xml is fine and UploadServlet.java has compiled properly but yet when try to run i get following error ERROR HTTP Status 500 - Error instantiating servlet class UploadServlet exception javax.servlet.ServletException: Error instantiating servlet class UploadServlet root cause java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory root cause java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileItemFactory UploadServlet.java import java.io.*; import java.util.*; import javax.servlet

I'm building up a Maven Java 1.8 project in which I've included the MySQL Connector as a dependency: <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.39</version> </dependency> In my application I've a singleton that holds the MySQL connection so when the application starts, the MySQL connector is triggered but I got a ClassNotFoundException for the driver that I'm using: com.mysql.cj.jdbc.Driver . The JDBC URL that I'm using is: jdbc:mysql://localhost:3306/mydb?autoReconnect=true&useSSL=false I'm using IntelliJ IDEA (2017.2) IDE. I've checked in

So I ran into a problem today while working on my Android program. I have a class that turns that an XML string into a Java object (third party) and it works fine in as a regular java project but on Android I get this weird error: 06-21 22:44:26.402: DEBUG/App(259): java.lang.ClassNotFoundException: com.package.mycode.Class in loader dalvik.system.PathClassLoader@4001b500 06-21 22:44:26.402: DEBUG/App(259): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243) I hide my application name and my package for obvious reasons but I was wondering if anyone has ever encountered

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\" distantinterfaces.DistantClass"); With no success and ClassNotFoundException . Full path to distant class is: C:/dir/distantinterfaces/DistantClass.class Use an URLClassLoader for this. The code might be something along the lines of: File f = new File("C:/dir"); URL[] cp = {f.toURI().toURL()}; URLClassLoader urlcl = new URLClassLoader(cp); Class clazz =

After adding the facebook dependency in gradle I'm getting this runtime error: compile 'com.facebook.android:facebook-android-sdk:4.6.0' Please notice that I'm also using okhttp: compile 'com.squareup.okhttp:okhttp:2.5.0' and error log is: E/AndroidRuntime: FATAL EXCEPTION: Thread-109754 Process: com.venkat.project, PID: 4453 java.lang.NoClassDefFoundError: com.squareup.okhttp.internal.Util at com.squareup.okhttp.OkHttpClient.<clinit>(OkHttpClient.java:57) at com.venkat.project.http.MyHTTPThread.run(MyHTTPThread.java:127) at com.venkat.project.http.MyHTTPThread.run(MyHTTPThread.java:61) at

I have written the following Java source file ( Hello.java ): package com; public class Hello { public static void main(String[] args) { System.out.println("Hello!"); } } I save this to C:/tmpjava/Hello.java . From the command line, I navigate to that directory and run javac Hello.java . Then I run dir : Hello.class Hello.java Then, from the same directory that I just ran javac from, I run java Hello.class and get: Exception in thread "main" java.lang.NoClassDefFoundError: Hello/class Caused by: java.lang.ClassNotFoundException: Hello.class at java.net.URLClassLoader$1.run(URLClassLoader.java