classnotfoundexception

问题 Just created a brand new project with Eclipse June 4.2 Use Google App Engine SDK 1.7.4 Eclipse create a Servlet public class ClockServlet extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { resp.setContentType("text/plain"); resp.getWriter().println("Hello, world"); } } and a simple web.xml <servlet> <servlet-name>Clock</servlet-name> <servlet-class>clock.ClockServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>Clock<

问题 I am now trying to deploy a Java application with Java Web Start. The application works fine when running standalone. I exported the project as a runnable .jar file, and then wrote the corresponding jnlp file. However, when running from the jnlp file, the application returns the following error when starting up: Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: someClass ........ Caused by: java.lang.ClassNotFoundException: someClass ......... I exported the .jar file

问题 I want to map over the characters in a string, but I'm getting runtime errors. Example: object Hello { def hello(c: Char) { print(c) } def main(args: Array[String]) { "Hello World!".map(hello) } } Trace: scalac Hello.scala java Hello Exception in thread "main" java.lang.NoClassDefFoundError: scala/LowPriorityImplicits at Hello.main(Hello.scala) Caused by: java.lang.ClassNotFoundException: scala.LowPriorityImplicits at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security

问题 In my application I use MessageDigest.getInstance("SHA-1") to get SHA1, it can run successfully in android 2.3, but it can't run in android 4.0 and it will show the below exception: FATAL EXCEPTION: main java.lang.NoClassDefFoundError: android.security.MessageDigest at com.screenshare.email.Utility.getConsistentDeviceId(Utility.java:597) at com.screenshare.exchange.SyncManager.getDeviceIdInternal(SyncManager.java:1079) at com.screenshare.exchange.SyncManager.getDeviceId(SyncManager.java:1045)

问题 I am getting this error, when executing JSF and PrimeFaces. I have included these jars, jsf-api-2.0.3.jar, jsf-impl-2.0.3.jar , jstl-1.0.2.jar jars and primefaces-2.2.RC2.jar in the WEB-INF/lib folder. Is there any jar I am missing? 回答1: Apparently, you're not missing anything else. Just try to do the following: Ensure that the necessary jars exist in the "lib" project folder; Do clean & build; In the end, you should find those included jars, available within the "build" project folder. 回答2:

问题 I have just upgraded my SpringSource Tools Suite (STS, a variant IDE of Eclipse) to the latest version (v3.6.1). Then all my JUnit unit tests can not be run again. I am getting this error: Class not found ClassToTest java.lang.ClassNotFoundException: ClassToTest at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java

问题 I have a problem since I updated my App on playstore. Since this update, the exception is thrown, but I haven´t changed anything related to this exception. Stacktrace: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{de.opiatefuchs.onthejobtimerlight/de.opiatefuchs.onthejobtimerlight.OnTheJobTimerActivity}: java.lang.ClassNotFoundException: Didn't find class "de.opiatefuchs.onthejobtimerlight.OnTheJobTimerActivity" on path: DexPathList[[zip file "/data/app/de

问题 I have an odd issue with codenameone, and I'm not even sure what went wrong. I've tried to "send windows phone build", and don't think I have changed anything else since then. However, after I did so the simulator wouldn't launch and kept saying my imports were wrong. They weren't, the suggested solution was importing once that were already in. The errors I get Exception in thread "main" java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

问题 I have an odd issue with codenameone, and I'm not even sure what went wrong. I've tried to "send windows phone build", and don't think I have changed anything else since then. However, after I did so the simulator wouldn't launch and kept saying my imports were wrong. They weren't, the suggested solution was importing once that were already in. The errors I get Exception in thread "main" java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

问题 I am starting a java and tomcat based application. I am getting the following error. Dec 08, 2015 12:04:00 PM org.apache.catalina.startup.SetAllPropertiesRule begin WARNING: [SetAllPropertiesRule]{Server/Service/Connector} Setting property 'maxSpareThreads' to '50' did not find a matching property. Dec 08, 2015 12:04:00 PM org.apache.catalina.startup.SetAllPropertiesRule begin WARNING: [SetAllPropertiesRule]{Server/Service/Connector} Setting property 'maxSpareThreads' to '50' did not find a