classnotfoundexception

问题 I am having some difficulty in making connectivity with Java and PostgreSQL Database.I have download the JDBC4 Postgresql Driver, Version 9.2-1002 driver and properly set the application ClassPath. My code is as under import java.sql.*; public class JavaPostGreSQLConnectivity { public static void main(String[] args) { DB db = new DB(); db.dbConnect("jdbc:postgresql://127.0.0.1:5432/TestDB", "postgres","pwd"); } } class DB { public DB() {} public void dbConnect(String db_connect_string, String

问题 I've just refactored an app into a framework library and an application, but now when I try and start the app in the emulator I get the following error stack trace: 06-02 18:22:35.529: E/AndroidRuntime(586): FATAL EXCEPTION: main 06-02 18:22:35.529: E/AndroidRuntime(586): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.matthewrathbone.eastersays/com.matthewrathbone.eastersays.EasterSimonSaysActivity}: java.lang.ClassNotFoundException: com.matthewrathbone

问题 I've just refactored an app into a framework library and an application, but now when I try and start the app in the emulator I get the following error stack trace: 06-02 18:22:35.529: E/AndroidRuntime(586): FATAL EXCEPTION: main 06-02 18:22:35.529: E/AndroidRuntime(586): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.matthewrathbone.eastersays/com.matthewrathbone.eastersays.EasterSimonSaysActivity}: java.lang.ClassNotFoundException: com.matthewrathbone

问题 I create a simple webapp using tomcat 6, spring 2.5.6 and maven. The problem is when I boot up tomcat, I am getting the following errors: SEVERE: StandardWrapper.Throwable java.lang.NoClassDefFoundError: org/springframework/ui/ModelMap ... Caused by: java.lang.ClassNotFoundException: org.springframework.ui.ModelMap The ModelMap class does exist in spring-2.5.6.jar and spring-context-2.5.6.jar , I also have some other spring jars. All of them are being deployed to tomcat correctly, when I

问题 I'm trying to run a sample from opencv for android. It's not working. java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.opencv.samples.puzzle15/org.opencv.samples. puzzle15.Puzzle15Activity}: java.lang.ClassNotFoundException: Didn't find class "org.opencv.samples.puzzle15.Puzzle15Activity" on path: DexPathList[[zip file "/data/app/org.opencv.samples.puzzle15- 1.apk"],nativeLibraryDirectories= [/data/app-lib/org.opencv.samples.puzzle15-1, /vendor/lib, /system/lib]]

问题 After installing eclipse scala plugins and eclipse maven plugin for scala . I am new to scala , so i tried to so ensured that the enviorment was working after testing a scala hello world project. It works as expected. But i am facing difficulty while trying to execute the project that i had checked out from the company's repository. No matter what I do (clean,build, clean-install via mave etc) I am getting a "Error: Could not find or load main class com.company.team.spark.sqlutil.testQuery "

问题 I have problem with rmiregistry. I'm getting below error: Cannot bind to URL [rmi://........]: javax.naming.NamingException [Root exception is java.rmi.UnexpectedException: undeclared checked exception; nested exception is: java.lang.ClassNotFoundException: Could not find class (javax.management.remote.rmi.RMIServerImpl_Stub) at codebase ()] I checked, class exist in the classpath. I used java 1.6 on linux. I started rmiregistry 6667 . Has anyone met with this error? 回答1: class exist in the

问题 When migrating our application from weblogic 12.1.3 to 12.2.1 we run into the following stacktrace during deployment of our EAR: <2018-06-05 16:17:03,765> <Error> <Deployer> <BEA-149265> <Failure occurred in the execution of deployment request with ID "518856605645758" for task "2" on [partition-name: DOMAIN]. Error is: "java.lang.ClassNotFoundException: afu.com.sun.source.tree.Tree$Kind" java.lang.ClassNotFoundException: afu.com.sun.source.tree.Tree$Kind at weblogic.utils.classloaders

问题 This question already has answers here : java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory (2 answers) How to fix ClassNotFoundException: org.apache.commons.logging.LogFactory? (5 answers) Closed 3 years ago . I am trying to send a notification using this class FCMHelper and im getting errors errors leading me to an error in httpclient this is my code ... public void send() throws IOException{ JsonObject notificationObject = new JsonObject(); notificationObject

问题 I have a very strange situation. I have a set of eclipse plugin projects which I am using tycho and maven for building them. I used JDBC driver in one of the projects and I have a test plugin to test this project. Since the com.mysql.jdbc plugin was not available in the eclipse p2 repository ( and we don't have our own p2), I imported the jdbc plugin and created an OSGi plugin and add the dependency to my local plugin. I have multiple eclipse workspaces sat up. Only in the very first