相关疑难解决方法(0)

我想将我的应用程序部署到版本7中的tomcat,我得到以下异常java.lang.NoClassDefFoundError: javax/el/ELManager 但是如果我尝试将此应用程序部署到tomcat版本8,它可以正常工作.

你有任何想法如何解决这个问题？

为什么我要从tomcat 8切换到7？在测试环境中,repo中的tomcat 8和服务器上的tomcat7.

的pom.xml

<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>certplatform</groupId>
<artifactId>certplatform</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
  <plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.7.0</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
    </configuration>
  </plugin>
  <plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.0.0</version>
    <configuration>
      <warSourceDirectory>WebContent</warSourceDirectory>
    </configuration>
  </plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring- 
core -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring- 
context -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring- 
context-support -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring- 
webmvc -->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.springframework/spring-web 
-->
<dependency> …

我有简单的Spring HelloWorld程序.其内容如下:

的pom.xml

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.mahesha999.examples.spring</groupId>
    <artifactId>SpringExamples</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>       
    </dependencies>

</project>

eg1.xml

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd">

    <bean id="helloBean" class="com.mahesha999.examples.spring.eg1.HelloWorld">
        <property name="name" value="Mahesha999" />
    </bean>

</beans>

HelloWorld.java

public class HelloWorld {
    private String name;

    public void setName(String name) {
        this.name = name;
    }

    public void printHello() {
        System.out.println("Spring  : Hello ! " + name);
    }
}

App.java

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {
    public static void main(String[] args) { …

我的应用程序在Emulators中运行良好,甚至在android studio安装的实际设备中用于调试目的,但如果使用apk文件手动安装它会崩溃.

我准备粘贴任何其他代码,如活动,如果需要.

这是logcat:

04-14 12:20:44.392 6220-6220/? I/art: Late-enabling -Xcheck:jni
04-14 12:20:44.465 6220-6220/test.planner W/System: ClassLoader referenced unknown path: /data/app/test.planner-1/lib/arm
04-14 12:20:44.467 6220-6220/test.planner I/InstantRun: starting instant run server: is main process
04-14 12:20:44.470 6220-6220/test.planner D/AndroidRuntime: Shutting down VM
04-14 12:20:44.471 6220-6220/test.planner E/AndroidRuntime: FATAL EXCEPTION: main
Process: test.planner, PID: 6220
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{test.planner/test.planner.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "test.planner.MainActivity" on path: DexPathList[[zip file "/data/app/test.planner-1/base.apk"],nativeLibraryDirectories=[/data/app/test.planner-1/lib/arm, /vendor/lib, /system/lib]]
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417) …

我正在尝试在mac上运行一个简单的sqlite示例.我很确定该代码在Windows上运行良好.但不是在Mac上.如果有人能帮助我,我真的很感激.

代码在Eclipse中运行.我在项目中添加了sqlite-jdbc4-3.8.2-SNAPSHOT.jar作为内部和外部jar.

  public class Test1 {

  private static Connection c;
  private static String filepath = "/Users/zerocraft/Documents/workspace/sql_test/";
  private static String sql;
  private static Statement query;


  public static void main(String[] args) {
          System.out.println("START");
          try{

            Class.forName("org.sqlite.JDBC");
            System.out.println("START2");

            c = DriverManager.getConnection("jdbc:sqlite:"+filepath+"projone.db");
            System.out.println("START3");

            }

            catch(Exception e){
                e.printStackTrace();
            }

                 sql =  "INSERT INTO table(date,time,client_id,run_id,latitude," +
                        "longitude,bearing,speed,altitude,sensor_id,sensor_type," +
                        "sensor_value,attribute)"
                + "VALUES ('A','B','C','D',0,1,2,3,4,'E','F','G','H')";


                try{
                query = c.createStatement();

                 query.executeUpdate(sql);
                 query.close();
                }
                catch(SQLException el){el.printStackTrace();}
        }   
   }        

安慰 ##

  START
  START2
  Exception in thread "main" java.lang.NoClassDefFoundError: org/sqlite/NativeDB
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at …

我正在测试maven及其功能.我正在尝试使用commons-io将字符串写入文本文件

import org.apache.commons.io.FileUtils;
...
public void writeToFile(String fileName){
    File file = new File(fileName);
    ...
    FileUtils.writeStringToFile(file,rowEntry); //rowEntry is a String
}  

我已将commons-io添加到依赖项中

的pom.xml

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.5</version>
 </dependency>  

它编译但是当我运行它时会引发异常

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/io/FileUtils
at com.RandCollections.StringFinder.writeToFile(StringFinder.java:704)
at com.RandCollections.StringFinder.menu(StringFinder.java:123)
at com.RandCollections.StringFinderMain.main(StringFinderMain.java:28)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.io.FileUtils
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 3 more   

我想我错过了一些事情,你能指点一下吗？

我意识到这些帖子中有一百万,但没有一个对我有帮助,所以这里说:我正在尝试部署一个非常非常简单的applet,它无法正常加载.我的HTML:

<html>
<head>
    <meta http-equiv="Content-Type" content"text/html; charset=utf-8">
</head>
<body>
   <applet code = "SimpleApplet.class"
   width = "320" height = "100"></applet>
</body>
</html>

我的Java:

package test;

import javax.swing.*;   

public class SimpleApplet extends JApplet{
   public void init(){
      try{
        SwingUtilities.invokeAndWait(new Runnable(){
          public void run(){
            JLabel lbl = new JLabel("Hello World");
            add(lbl);
          }
        });             
      }
      catch(Exception e){
        System.out.println(e);
      }
   }
}

两个文件都位于同一目录中

/home/me/workspace/myProject/bin/test

如果我通过Eclipse自己运行applet,它运行正常.当我打开页面时,我收到错误

java.lang.NoClassDefFoundError: SimpleApplet (wrong name: test/SimpleApplet)

该错误表明我错误地放置或命名了某些内容.然而,经过尝试

<applet code = "test/SimpleApplet.class"
width = "320" height = "100"></applet>

<applet code = "SimpleApplet.class"
codebase …

运行此代码时出现以下错误：（ColorMatrixgetarray()返回 float[]）

74 public void testHueShift() {
75     ColorMatrix cm1 = new ColorMatrix();
76     ColorMatrix cm2 = hueShift(0f);
77     assertArrayEquals(cm1.getArray(), cm2.getArray(), 0f);
78 }

错误：

 ----- begin exception -----
 java.lang.NoClassDefFoundError: org.junit.Assert
    at com.Common.lib.test.ColorFilterFactoryTest.testHueShift(ColorFilterFactoryTest.java:77)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at junit.framework.TestCase.runTest(TestCase.java:154)
    at junit.framework.TestCase.runBare(TestCase.java:127)
    at junit.framework.TestResult$1.protect(TestResult.java:106)
    at junit.framework.TestResult.runProtected(TestResult.java:124)
    at junit.framework.TestResult.run(TestResult.java:109)
    at junit.framework.TestCase.run(TestCase.java:118)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
    at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
    at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:545)
    at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1551)
 ----- end exception -----

但项目构建路径有它：

编辑
这是测试类类路径

这是被测试的类（它是一个库项目）

我编写了maven项目，并在Eclipse中运行了它，但是我想使用命令行来运行maven项目，所以我写了

java -jar -Dapple.awt.UIElement="true" target/myproject-1.0-SNAPSHOT.jar -h

行在cmd中，但出现此错误http://i.stack.imgur.com/c03mN.png。

我该如何解决？

我在pom.xml中添加了最新的Selenium依赖项

<dependency>
    <groupId>org.seleniumhq.selenium</groupId>
    <artifactId>selenium-java</artifactId>
    <version>3.7.1</version>
</dependency>

我使用pom.xml在目录内运行了mvn clean install，并且根据Selenium文档，我还在应用程序类中导入了正确的类。

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

但是，当我尝试运行主方法时，出现以下错误

Exception in thread "main" java.lang.NoClassDefFoundError: 
org/openqa/selenium/WebDriver

我查看我的〜/ .m2 / repository文件夹，但没有看到openqa文件夹，但看到了seleniumhq文件夹。

为什么maven不安装openqa文件夹，为什么文档说要从org.openqa导入...当我的jar存储库中不存在该文件时。我很困惑，我只想在本地存储库中成功导入Selenium Webdriver。

引起:java.lang.NoClassDefFoundError:解析失败:Lorg/apache/http/impl/client/DefaultHttpClient

我无法解决以下错误:

引起:java.lang.NoClassDefFoundError:解析失败:Lorg/apache/http/impl/client/DefaultHttpClient; com.medicend.jykra.medicend.Async.Parser.LoginParser.hitWS(LoginParser.java:68)at com.medicend.jykra.medicend.Async.Parser.LoginParser.postData(LoginParser.java:50)at com.medicend .jykra.medicend.Activity.SignInActivity $ LoginAsync.doInBackground(SignInActivity.java:91)at com.medicend.jykra.medicend.Activity.SignInActivity $ LoginAsync.doInBackground(SignInActivity.java:73)at android.os.AsyncTask $ 2.在java.util.concurrent的android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:245)的java.util.concurrent.FutureTask.run(FutureTask.java:266)调用(AsyncTask.java:333). ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:641)at java.lang.Thread.run(Thread.java:764)引起:java.lang .ClassNotFoundException:在路径上找不到类"org.apache.http.impl.client.DefaultHttpClient":DexPathList [[zip file"/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/base.apk ",zip文件"/ data/app/c om.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ ==/split_lib_dependencies_apk.apk",zip文件"/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_resources_apk.apk",zip文件"/ data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ ==/split_lib_slice_0_apk.apk",zip file"/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_1_apk.apk",zip file"/ data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ ==/split_lib_slice_2_apk.apk",zip file"/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_3_apk.apk",zip file"/ data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ ==/split_lib_slice_4_apk.apk "zip文件 "/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_5_apk.apk",zip文件"/数据/应用程序/ com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ ==/split_lib_slice_6_apk.apk",zip file"/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_7_apk.apk",zip 文件 "/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_8_apk.apk",zip文件 "/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_slice_9_apk.apk"], nativeLibraryDirectories = [/ data/app/com.medicend.jykra.medicend -IiBcrMY7QQm4ixa9RIMICQ ==/lib/x86,/ system/lib]],位于java.lang的dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134). Class.Loader.loadClass(ClassLoader.java:379)at java.lang.ClassLoader.loadClass(ClassLoader.java:312)at com.medicend.jykra.medicend.Async.Parser.LoginParser.hitWS(LoginParser.java:68)at com .medicend.jykra.medicend.Async.Parser.LoginParser.postData(LoginParser.java:50)at com.medicend.jykra.medicend.Activity.SignInActivity $ LoginAsync.doInBackground(SignInActivity.java:91)at com.medicend.jykra .medicend.Activity.SignInActivity $ LoginAsync.doInBackground(SignInActivity.java:73)at android.os.AsyncTask $ 2.call(AsyncTask.java:333)at java.util.concurrent.FutureTask.run(FutureTask.java:266)在android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:245)java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)at java.util.concurrent.ThreadPoolExecutor $ Worker.run(ThreadPoolExecutor.java:641) )在java.lang.Thread.run(Thread.java:764)抑制:java.io.IOException:找不到dex位置的原始dex文件/data/app/com.medicend.jykra.medicend-IiBcrMY7QQm4ixa9RIMICQ==/split_lib_resources_apk …