noclassdeffounderror

I currently have an ActionBarActivity which always returns a NoClassDefFoundError . I've read that it might be a problem with the ADT but I cannot be sure, hence my question. I've imported the ActionBar sample from the Android samples under android-sdk\samples\android-14\ActionBarCompat I've labelled the ActionBarCompat project as a library under Project -> Properties but I'm still getting the error. To reiterator: public class SearchActivity extends ActionBarActivity { // Doesn't work, yields exception public class SearchActivity extends Activity { // Works perfectly Has anyone else

I'm having trouble getting the import of all the required .jar files working correctly. My end goal is simply to read in an excel spreadsheet (more specifically .xlsx files) to check whether the speed of Apache POI will work for future applications. My question is why am I getting thrown the error... java.lang.NoClassDefFoundError: org/apache/poi/openxml4j/exceptions/InvalidFormatException ...when I can see in the class InvalidFormatException at /org/apache/poi/openxml4j/exceptions/ in the 'file poi-ooxml-3.9-20121203.jar'? I haven't done programming in Java in a while and I'm hoping for my

I've created my own URLClassLoader , and set it as the system classloader via java.system.class.loader . It's initialized and everything, but the classes I'm trying to load aren't found. Here's the URLClassLoader : public class LibraryLoader extends URLClassLoader { public LibraryLoader(ClassLoader classLoader) { super(new URL[0], classLoader); } synchronized public void addJarToClasspath(String jarName) throws MalformedURLException, ClassNotFoundException { File filePath = new File(jarName); URI uriPath = filePath.toURI(); URL urlPath = uriPath.toURL(); System.out.println(filePath.exists());

定义： 对于术语的定义，最原汁原味的还是官方文档。 关于 ClassNotFoundException ， JavaDoc 里这么描述： Thrown when an application tries to load in a class through its string name using: The forName method in class Class . The findSystemClass method in class ClassLoader . The loadClass method in class ClassLoader . but no definition for the class with the specified name could be found. 关于 NoClassDefFoundError ， JavaDoc 里这么描述： Thrown if the Java Virtual Machine or a ClassLoader instance tries to load in the definition of a class (as part of a normal method call or as part of creating a new instance using the new expression) and

when I run tomcat and the war is deployed I get : NoClassDefFoundError : org/apache/commons/collections/map/LRUMap Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/collections/map/LRUMap at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527) ~[spring-beans-3.1.0.RELEASE.jar:3.1.0.RELEASE] What is strange is that I got the commons-collections-2.1.jar (I even tried 3.1) in my WEB-INF lib folder. Edit : I did copy the commons-collections from WEB-INF/lib to

I can compile this JNA example code (from step 2 of https://github.com/twall/jna/#getting_started ): package com.sun.jna.examples; import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.Platform; /** Simple example of JNA interface mapping and usage. */ public class HelloWorld { // This is the standard, stable way of mapping, which supports extensive // customization and mapping of Java to native types. public interface CLibrary extends Library { CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"), CLibrary.class); void printf(String

Wondering if any guru out there could shed an idea on why the following randomly happens. We have a web application we deploy in Jetty 6.1.26 running on a Linux installation with JRE 1.7_03 Not every time, but every now and then, when Jetty starts up - what appears to be a random class (from our project) seems to be the source of a NoClassDefFound error. If we restart Jetty they problem disappears. The only pattern that occurs seems to be the classes at the root of the error are populated via JAXB annotations. To give more of an idea of the frequency it feels this happens 1/50 times, if that.

I have a funny problem - if my application runs for a long time (> 20h), then sometimes I get NoClassDefFound error - seems like JVM decided that the class is not going to be used anyway and GCd it. To be a bit more specific, here's an example case: object ErrorHandler extends PartialFunction[Throwable,Unit] { def isDefinedAt(t: Throwable) = true def apply(e: Throwable) =e match { // ... handle errors } } // somewhere else in the code... try { // ... long running code, can take more than 20 hours to complete } catch (ErrorHandler) And I get the following exception: Exception in thread "main"