classnotfoundexception

问题 I've installed ubuntu 10.10 in my system and installed ant with the following command: sudo apt-get install ant Now, ant is visible in the share folder, so I've tried to run the ant command in terminal, but it gives me this error: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/Launcher Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security

问题 I've installed ubuntu 10.10 in my system and installed ant with the following command: sudo apt-get install ant Now, ant is visible in the share folder, so I've tried to run the ant command in terminal, but it gives me this error: Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/Launcher Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security

问题 This question already has answers here : ClassNotFoundException com.mysql.jdbc.Driver [duplicate] (21 answers) Connect Java to a MySQL database (13 answers) Closed last year . This question has been asked a lot here, but i still can't fix my problem: I put mysql-connector-java-5.1.18-bin into C:\Program Files\Java\jre6\lib\ext folder. I have this code: // Load the database driver Class.forName("com.mysql.jdbc.Driver"); // Get a connection to the database Connection conn = DriverManager

问题 I have a jar file foobar.jar containing the following two classes: public class Foo { public static void main(String[] args) { System.out.println("Foo"); } } The other class looks like this: import javax.batch.api.chunk.ItemProcessor; public class Bar implements ItemProcessor { public static void main(String[] args) { System.out.println("Bar"); } @Override public Object processItem(Object item) throws Exception { return item; } } If I execute the program using the following command, the

问题 I'm trying to obfuscate my JavaFX application but it fails. The generated result does not work and I do not understand why. The resulting jar just fails because the fxml file cannot load all imports anymore (ClassNotFoundException). The Deployment workflow: Build runnable jar (in IntelliJ knwon as an artifact) Obfuscate that jar with ProGuard Fix some issues in that jar that ProGuard fails to do 1) The minimal example application The example application 'GuardTest' is a IntelliJ project that

问题 This project worked wonders before updating to ADT22. I already lost a day because of not knowing I had to download build tools , and I'm afraid I'm going to loose another one because of this. When I try to build the same code that was working two days ago, I get this exception: com.cidaut.blueparking fatal error : Unable to instantiate activity \ ComponentInfo{com.cidaut.blueparking/com.cidaut.blueparking.SplashScreen_}: \ java.lang.ClassNotFoundException: \ Didn't find class "com.cidaut

问题 I can't find the solution of this error.Can you please give the permanent solution.i have no idea how to solve it can u help me .Thanks 01-04 11:06:42.302: E/AndroidRuntime(1906): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{e.gochat/e.gochat.gochat.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "e.gochat.gochat.MainActivity" on path: DexPathList[[zip file "/data/app/e.gochat-1.apk"],nativeLibraryDirectories=[/data/app-lib/e.gochat-1, /vendor

问题 I can't find the solution of this error.Can you please give the permanent solution.i have no idea how to solve it can u help me .Thanks 01-04 11:06:42.302: E/AndroidRuntime(1906): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{e.gochat/e.gochat.gochat.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "e.gochat.gochat.MainActivity" on path: DexPathList[[zip file "/data/app/e.gochat-1.apk"],nativeLibraryDirectories=[/data/app-lib/e.gochat-1, /vendor

问题 I'm having some annoying problems with the following code, that worked okay until switched to Java 1.7 import javax.xml.validation.SchemaFactory; SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Running from Netbeans with -Djaxp.debug=1, the following error is thrown: The above snipped code is part of an OSGI bundle JAXP: using thread context class loader (sun.misc.Launcher$AppClassLoader@5e3a78ad) for search JAXP: Looking up system property 'javax.xml

问题 I'm having an intermittent error with a legacy production app. On some boxes, certain features will break somewhat randomly. In the logs, i get a ClassNotFound exception. However, the class is there, in WEB-INF/classes and the rest of the app is loading properly (this is not loaded with reflection/forName/etc, its just a standard java class). The boxes are configured identially, but this does not happen on every box. Restarting the app will work, but its a large cluster, and pretty irritating