classnotfoundexception | 易学教程

Android emulator crash: “Dx bad class file magic” / ClassNotFoundException on startup?

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问题 I am developing a game in android and I have an issue. I have the game fully functioning on my other computer so I committed the project to an svn server to use on my new windows 7 64 bit computer. I checked it out on my new computer with subversive in eclipse. Obviously I had some issues with the build paths so I fixed those and the project was error free. When I go to run it on an emulator running android 2.3.3 it crashes at startup with a ClassNotFoundException for the main activity. I

“Could not find the main class”

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问题 I'm trying to run a sample Java application from the command promopt but I'm getting the following error: Exception in thread "main" java.lang.NoClassDefFoundError: com/badlogic/gdx/helloworld/HelloWorldDesktop Caused by: java.lang.ClassNotFoundException: com.badlogic.gdx.helloworld.HelloWorldDesktop at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang

Maven项目下update maven后Eclipse报错：java.lang.ClassNotF

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工程为maven工程，ContextLoaderListener类位于spring-web-3.1.0.RELEASE.jar包中。检查了maven的pom.xml，依赖引入正常。在工程Maven Dependencies视图中也能看到spring-web-3.1.0.RELEASE.jar包被正常引入进来了。错误原因：进入到tomcat的部署路径.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\下检查了一下，发现工程部署后在WEB-INF文件夹下没有生成lib目录，正常情况下，会生成lib目录并把工程的所有依赖jar包都部署到该目录下。解决方案： 1.右键点击项目（单个工程，不要选父工程）--选择Properties 选择Deployment Assembly,在右边点击Add按钮，在弹出的窗口中选择Java Build Path Entries 2.点击Next，选择Maven Dependencies 3.点击Finish，然后可以看到已经把Maven Dependencies添加到Web应用结构中了操作完后，重新部署工程，不再报错了。然后我们再到.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\目录下，发现工程WEB

android.support.v4.content.FileProvider class not found in android Kitkat

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问题 I am using FileProvider in my app. As usual I declared <Provider> tag in AndroidManifest.xml file as below. <provider android:name="android.support.v4.content.FileProvider" android:authorities="com.jk.android.fileprovider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/file_paths" /> </provider> When I run it on android device which has lollipop version it works fine. when I try it on kitkat

Didn't find class on path DexPathList

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问题 I was attempting to update my project to targetSdk 23, but I decided I wasn't up for it given all the deprecations. I didn't want to go through it so I reverted to an older version on mercurial, and now all I get is this error and I can't get the damn app to run again. What could possibly be going wrong? 12-21 02:36:00.545 437-437/com.elgami.customizer E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.elgami.customizer, PID: 437 java.lang.RuntimeException: Unable to instantiate application

ClassNotFoundException upon running JAR, no errors while running in IntelliJ IDEA

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I'm just starting to build Java apps (I do have .NET experience) and I was trying to build a small test app whose whole code is this : package com.company; import com.microsoft.sqlserver.jdbc.SQLServerDataSource; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; public class Main { public static void main(String[] args) throws SQLException { System.out.println("Buna lume!"); SQLServerDataSource ds = new SQLServerDataSource(); ds.setIntegratedSecurity(true); ds.setServerName("localhost"); ds.setPortNumber(1433); ds

java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

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问题 I am getting this error when compiling my java program java.lang.ClassNotFoundException: com.mysql.jdbc.Driver Then I knew that I should add the path of mysql-connector-java-3.1.14-bin.jar to the java classpath. I am using Windows XP, I edited the classpath in the controlpanel/system/enviromental variables the classpath was : .;C:\j2sdk1.4.2_16\jre\lib; so now it became : .;C:\j2sdk1.4.2_16\jre\lib;C:\Program Files\mysql-connector-java-3.1.144 however, i still get the same error, moreover,

Why do I get java.lang.NoClassDefFoundError when I trying to run this code?

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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.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190)

Mapper class not found

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问题 Sometimes my MR job complains that MyMapper class in not found. And that i have to give job.setJarByClass(MyMapper.class); to tell it to load it from my jar file. cloudera@cloudera-vm:/tmp/translator$ hadoop jar MapReduceJobs.jar translator/input/Portuguese.txt translator/output 13/06/13 03:36:57 WARN mapred.JobClient: No job jar file set. User classes may not be found. See JobConf(Class) or JobConf#setJar(String). 13/06/13 03:36:57 INFO input.FileInputFormat: Total input paths to process : 1

Android ProGuard +MultiDex causes ClassNotFoundException

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I have MultiDex enabled in my android project. It was working fine until I tried enabling proguard. I can successfully build the project but I get runtime exception on startup. It's unable to find the Application class and the MainActivity . I had the same problem before enabling MultiDex . Now I guess for some reason the MultiDex is not working properly with ProGuard . Here is what i get in the logcat - 02-17 19:01:09.749: I/MultiDex(2079): VM with version 2.1.0 has multidex support 02-17 19:01:09.749: I/MultiDex(2079): install 02-17 19:01:09.749: I/MultiDex(2079): VM has multidex support,