标签: classnotfoundexception

所以我在处理Android程序时遇到了一个问题.我有一个类将XML字符串转换为Java对象(第三方),它作为常规Java项目工作正常但在Android上我得到这个奇怪的错误:

06-21 22:44:26.402: DEBUG/App(259): java.lang.ClassNotFoundException: com.package.mycode.Class in loader dalvik.system.PathClassLoader@4001b500
06-21 22:44:26.402: DEBUG/App(259):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)

我出于显而易见的原因隐藏了我的应用程序名称和我的软件包,但我想知道是否有人遇到过这样的问题.类在正确的包中,这是我添加的库.我之前参考的其他课程都在那里,可以制作.是否还有其他原因ClassNotFoundException被抛出？

谢谢,杰克

在Eclipse Galileo上,在执行Debug As/Web Application时得到以下ClassNotFoundException.但是在运行As/Web Application时工作得很好.

我收到消息"源附件不包含文件URLClassLoader.class的源.您可以通过单击下面的更改附加源来更改源附件:"

在项目窗口中,似乎URLClassLoader类来自Java.net包,它来自/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Classes/classes.jar.

我在机器上发现了罐子,我还缺少什么？为什么它只是调试问题？

我的iMac 10.6.5机器上的JRE系统库是否可能已过时？或者以某种方式安装/卸载某些jar /包导致了这个问题？

这就是我所拥有的 - JRE系统库[JVM 1.6.0(MacOS X默认)] - 会更新它有助于解决问题吗？但如何更新？

请帮忙!

com.google.appengine.tools.development.DevAppServerMain at localhost:57873 
 Thread [main] (Suspended (exception ClassNotFoundException)) 
  Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: 207 
  Launcher$ExtClassLoader.findClass(String) line: 229 
  Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: 307 
  Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: 296 
  Launcher$AppClassLoader.loadClass(String, boolean) line: 301 
  Launcher$AppClassLoader(ClassLoader).loadClass(String) line: 248 
  InstrumentationImpl.loadClassAndStartAgent(String, String, String) line: 280 
  InstrumentationImpl.loadClassAndCallPremain(String, String) line: 338 
/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/bin/java (Nov 30, 2010 9:40:41 PM) 

我对我的项目进行了JUnit测试,可以正确运行Eclipse.

所以,现在我尝试将这些测试与ant任务集成.为此,我制作了以下蚂蚁脚本:

<path id="classpath-test">
    <pathelement path="." />
    <pathelement path="${classes.home}" />
    <fileset dir="${lib.home}" includes="*.jar" />
    <fileset dir="${libtest.home}" includes="*.jar" />
</path>

    <target name="compile" ... > // compiles src code of the project

<target name="compile-tests" depends="compile">
    <javac  srcdir="${test.home}"
            destdir="${testclasses.home}" 
            target="1.5"
            source="1.5" 
            debug="true"
        >
        <classpath refid="classpath-test" />
    </javac>

    <copy todir="${testclasses.home}">
        <fileset dir="${test.home}">
            <exclude name="**/*.java"/>
        </fileset>
    </copy>
</target>

<target name="unit-test" depends="compile-tests">
    <junit printsummary="false" fork="off" haltonfailure="true">
        <classpath refid="classpath-test" />

        <formatter type="brief" usefile="false" />

        <test name="com.test.MyTest" />

        <!--<batchtest todir="${reports.dir}" >
            <fileset dir="${testclasses.home}" >
                <exclude name="**/AllTests*"/>
                <include name="**/*Test.class" …

When i run the jsp page i am getting the following error. 
Web sever : Tomcat 6.0 , using Struts 
java.lang.ClassNotFoundException: javax.servlet.jsp.SkipPageException 
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) 
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) 
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:128) 
at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66) 
at org.apache.jsp.jsp.login.Main_005ffit_jsp._jspService(Main_005ffit_jsp.java:2846) 
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:386) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) 
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) 
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) 
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) 
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1069) 
at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:455) 
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279) 
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) 
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) …

我通过扩展现有控件创建了一个新控件,我想在我的JavaFX场景中使用这个新控件.我希望能够使用Scene Builder编辑我的场景,但在将新控件添加到FXML文件后,我ClassNotFoundException在打开Scene Builder 时遇到了问题.

例如,这是我制作的一个类,它扩展了TextField:

RegexLimitingTextField.java

public class RegexLimitingTextField extends TextField {

    private String regexLimiter = ".*";

    public void setRegexLimiter(String regex) {
        this.regexLimiter = regex;
    }

    @Override
    public void replaceText(int start, int end, String text) {
        if (text.matches(regexLimiter))
            super.replaceText(start, end, text);
    }

    @Override
    public void replaceSelection(String replacement) {
        if (replacement.matches(regexLimiter))
            super.replaceSelection(replacement);
    }
}

将此控件添加到我的FXML文件后...

sample.fxml

<?import javafx.scene.layout.GridPane?>
<?import sample.RegexLimitingTextField?>
<GridPane fx:controller="sample.Controller"
          xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10">
    <RegexLimitingTextField fx:id="textField" text="Test" />
</GridPane>

...加载Scene Builder 2.0时出现此错误:

Caused by: java.lang.ClassNotFoundException: …

我在项目中添加了新模块并在那里粘贴了新的源代码.

我已经建立了应用程序,然后开始.

我在启动时看到以下错误:

java.lang.IllegalStateException: Failed to introspect bean class [MyClass] for persistence metadata: could not find class that it depends on
.....
Caused by: 
java.lang.ClassNotFoundException: MyClass

MyClass 居住在新模块中.

的build.gradle:

apply plugin: 'java'

dependencies {
    compile project(':my-old-module')
}

有任何想法吗？

我正在使用Tomcat来部署java webapp.

简而言之,我获得了很长的堆栈跟踪:

GRAVE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/new-webapp]]
[...]
Caused by: java.lang.NoClassDefFoundError: Lorg/apache/logging/log4j/Logger;
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2509)
    at java.lang.Class.getDeclaredFields(Class.java:1819)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:256)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationFilterAnnotations(WebAnnotationSet.java:105)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:64)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:335)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:782)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:306)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5150)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.Logger
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139)
    ... 20 more
[...]

现在,错误很明显.出于某种原因,log4j包不在类路径中.

该应用程序是一个maven webapp,pom.xml是这样的:

<project 
    xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.wb</groupId>
    <artifactId>new-webapp</artifactId>
    <packaging>war</packaging>
    <version>0.0.1</version>
    <properties> …

java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/Api$zzf;

我在运行时遇到错误.

我设置multiDexEnabled为true,但我仍然收到错误.

我无法找到背后的原因.这个问题没有正确的解决方案.

我正在使用最新版本的Intellij Idea，并将jdk设置为11。执行我的项目时，它将引发异常noclassfoundexception：java.sql.SQLException。

在Intellij的Java编译器设置中，我提到的项目字节码版本为11。在项目结构设置中，我也将模块jdk设置为11。

我刚刚将android Facebook SDK添加到我的项目中，以使用Facebook广告来推广我的应用，并且该应用在启动时崩溃，但出现了此异常

这是日志

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: www.pro_cs_is.com, PID: 20307
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/facebook/appevents/InternalAppEventsLogger;
        at com.facebook.marketing.internal.MarketingLogger.<init>(MarketingLogger.java:47)
        at com.facebook.marketing.internal.MarketingInitProvider.setupCodeless(MarketingInitProvider.java:68)
        at com.facebook.marketing.internal.MarketingInitProvider.onCreate(MarketingInitProvider.java:49)
        at android.content.ContentProvider.attachInfo(ContentProvider.java:1927)
        at android.content.ContentProvider.attachInfo(ContentProvider.java:1902)
        at android.app.ActivityThread.installProvider(ActivityThread.java:6528)
        at android.app.ActivityThread.installContentProviders(ActivityThread.java:6021)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5927)
        at android.app.ActivityThread.access$1200(ActivityThread.java:200)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1673)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:201)
        at android.app.ActivityThread.main(ActivityThread.java:6806)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.appevents.InternalAppEventsLogger" on path: DexPathList[[zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/base.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_dependencies_apk.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_resources_apk.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_slice_0_apk.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_slice_1_apk.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_slice_2_apk.apk", zip file "/data/app/www.pro_cs_is.com-ewD1U225Ajh1l9uikBkdWg==/split_lib_slice_3_apk.apk", …