标签: noclassdeffounderror

NoClassDefFoundError当我运行我的Java应用程序时,我得到了一个.这通常是什么原因？

NoClassDefFoundError和之间有什么区别ClassNotFoundException？

是什么导致他们被抛出？他们怎么解决？

在修改现有代码以包含新的jar文件时,我经常遇到这些throwable.对于通过webstart分发的Java应用程序,我在客户端和服务器端都点击了它们.

我遇到的可能原因:

1. build.xml代码的客户端不包含的包
2. 我们正在使用的新jar中缺少运行时类路径
3. 版本与之前的jar冲突

当我今天遇到这些时,我采取了一种线索和错误的方法来使事情发挥作用.我需要更清晰和理解.

我在Oracle的Java教程中尝试过这两个例子.它们都编译得很好,但在运行时,都会出现这个错误:

Exception in thread "main" java.lang.NoClassDefFoundError: graphics/shapes/Square
    at Main.main(Main.java:7)
Caused by: java.lang.ClassNotFoundException: graphics.shapes.Square
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 1 more

我想我可能将Main.java文件放在错误的文件夹中.这是目录层次结构:

graphics
? Main.java
? shapes
|   ? Square.java
|   ? Triangle.java
? linepoint
|   ? Line.java
|   ? Point.java
? spaceobjects
|   ? Cube.java
|   ? RectPrism.java

这是Main.java:

import graphics.shapes.*;
import graphics.linepoint.*
import graphics.spaceobjects.*;

public class Main {
    public static void main(String …

我正在执行spring的简单依赖注入程序并获得此异常.我已经包含了common-logging1.1.1.jar和spring.jar文件.你能帮帮忙吗？

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
    at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:119)
    at org.springframework.context.support.AbstractXmlApplicationContext.<init>(AbstractXmlApplicationContext.java:55)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:77)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:65)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:56)
    at com.client.StoryReader.main(StoryReader.java:15)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    ... 6 more

public class PropHolder {
  public static Properties prop;

  static {
    //code for loading properties from file
  }
}

// Referencing the class somewhere else:
Properties prop = PropHolder.prop;

class PropHolder是我自己的一类.该类驻留在主类的同一JAR文件中.所以这不应该因为类路径中缺少任何JAR.

当我查看JAR文件时jar tf myjarfile,我可以看到PropHolder.class列出的那个.

顺便说一句:代码在我的本地机器上正常运行.但是当我将一些脚本部署到Linux服务器上时,它无法工作.所以我认为这不是代码的问题.但出于某种原因.部署过程很难跟踪.

可能是什么问题呢？

在运行junit测试时,eclipse我得到了这个Exception:

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing

我添加了junit.jar库文件.

我试过不同版本的junit.jar的:4.4,4.8等等.

如何修复此异常？

到目前为止,我只为一位使用root手机的用户(SM-G900R7 Android 4.4.2)收到此错误.错误是这样的:

Fatal Exception: java.lang.NoClassDefFoundError: android/graphics/drawable/Icon
       at java.lang.Class.getDeclaredMethods(Class.java)
       at java.lang.Class.getDeclaredMethods(Class.java:656)
       at android.view.ViewDebug.getExportedPropertyMethods(ViewDebug.java:960)
       at android.view.ViewDebug.exportMethods(ViewDebug.java:1047)
       at android.view.ViewDebug.dumpViewProperties(ViewDebug.java:997)
       at android.view.ViewDebug.dumpViewProperties(ViewDebug.java:983)
       at android.view.ViewDebug.dumpView(ViewDebug.java:900)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:870)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dumpViewHierarchy(ViewDebug.java:867)
       at android.view.ViewDebug.dump(ViewDebug.java:793)
       at android.view.ViewDebug.dispatchCommand(ViewDebug.java:416)
       at android.view.ViewRootImpl$W.executeCommand(ViewRootImpl.java:6258)
       at android.view.IWindow$Stub.onTransact(IWindow.java:65)
       at android.os.Binder.execTransact(Binder.java:404)
       at dalvik.system.NativeStart.run(NativeStart.java)

我从不在我的代码中使用android.graphics.drawable.Icon,所有用法都是来自android.support.v4.graphics.drawable.IconCompat我也从不在我的代码中使用该类...

顺便说一句,我的支持库是 version 26.0.0, my minSdkVersion is 15 targetSdkVersion is 26.

谢谢

我试着用谷歌地图android v2做一个非常简单的活动的演示,只需从谷歌页面复制代码:https: //developers.google.com/maps/documentation/android/start#adding_the_api_key_to_your_application

活动:

package com.example.mapdemo;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

布局:

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/map"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  class="com.google.android.gms.maps.MapFragment"/>

我已经根据页面申请了api密钥并修改了我的androidmanifest.xml文件,就像这样:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.wenhai.driverschool"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

    <uses-permission android:name="android.permission.INTERNET" />

    <!-- add for map2 -->
    <permission
        android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <!-- External storage for caching. -->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Maps API needs …

我的用户经常遇到错误.应用程序在启动期间崩溃.当应该加载MainActivity时,VM显然无法找到该类.我无法弄清楚为什么.该应用程序的体系结构是我的免费和专业版都使用的共同项目.不知道它是否相关.请参阅下面的堆栈跟踪.有什么想法吗？

java.lang.NoClassDefFoundError: com.android.common.MainActivity
at com.mycompany.myapp.Splash.onCreate(Splash.java:23)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: com.android.common.MainActivity in loader     dalvik.system.PathClassLoader[/system/framework/com.google.android.maps.jar:/data/app/com.android.pro-1.apk]

编辑: 感谢下面的评论,理查德.现在我已经改变com.android.Splash了别的东西.反正它不是真正的类名.我的错...!

我在junit测试代码中的java中收到此错误.我抬头看着网,它说我需要在类路径中添加junit.jar.

在Eclipse中,我已将它添加到Project Properties窗口的类路径中,但仍然会出现初始化错误.我该怎么办..？

这是错误的完整描述:

java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.junit.internal.builders.JUnit4Builder.runnerForClass(JUnit4Builder.java:13)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
    at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
    at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.<init>(JUnit4TestReference.java:32)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestClassReference.<init>(JUnit4TestClassReference.java:25)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.createTest(JUnit4TestLoader.java:41)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestLoader.loadTests(JUnit4TestLoader.java:31)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:452)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.ClassNotFoundException: org.hamcrest.SelfDescribing
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown …