[英]NoClassDefFoundError while executing main class using java -classpath command
I have a Maven project and within that I have a Main.java
class that contains the main()
method that I would like to execute from Windows command prompt.我有一个 Maven 项目,其中有一个Main.java
类,其中包含我想从 Windows 命令提示符执行的main()
方法。 I am using the following command to execute it but it fails with an error message (show below).我正在使用以下命令来执行它,但它失败并显示错误消息(如下所示)。 This program works fine from IDE.该程序在 IDE 中运行良好。
Similar question at stackoverflow Why am I getting a NoClassDefFoundError in Java? stackoverflow 上的类似问题为什么我在 Java 中得到 NoClassDefFoundError? has been listed but does not provide a solution.已列出但未提供解决方案。 It only explain the problem in a detailed manner.它只是详细说明问题。
Please guide.请指导。
Command to execute main class:执行主类的命令:
java -classpath target\jobchain-dataloader.jar com.ebayenterprise.ecp.jobs.Main
Error Log:错误日志:
C:\office-data\v11-Projects\jobchain-dataloader>java -classpath target\jobchain-dataloader.jar com.ebayenterprise.ecp.jobs.Main
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/quartz/ScheduleBuilder
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.quartz.ScheduleBuilder
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)
... 7 more
Main.java主程序
package com.ebayenterprise.ecp.jobs;
public class Main {
private static final Logger LOG = Logger.getLogger(Main.class);
public static void main(String[] args) throws SchedulerException {
LOG.debug("Scheduler started sucessfully.....");
//get scheduler instance
Scheduler scheduler = new StdSchedulerFactory().getScheduler();
scheduler.start();
//get scheduling time details
Properties props = loadProperties("scheduler.properties");
int mins = Integer.parseInt(props.getProperty("mins"));
//kick off job
scheduler.scheduleJob(getJobDetail(RecurringDataLoader.class), getJobTrigger(mins));
}
public static JobDetail getJobDetail(Class z) {
return JobBuilder.newJob(z).withIdentity(RECURRING_DATA_LOADER_JOB, DATA_LOADER_JOB_GRP).build();
}
//create a simple trigger
public static Trigger getJobTrigger(int mins) {
Trigger trigger = TriggerBuilder.newTrigger()
.withIdentity(RECURRING_DATA_LOADER_TRIGGER, DATA_LOADER_TRIGGER_GRP)
.startNow()
.withSchedule(simpleSchedule()
.withIntervalInMinutes(mins)
.repeatForever())
.build();
return trigger;
}
}
pom.xml pom.xml
<dependencies>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc7</artifactId>
<version>7.0</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.2-1004-jdbc41</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
</dependencies>
Was able to get the program working by adding following plugins in the pom.能够通过在 pom.xml 中添加以下插件来使程序正常工作。
The first dependency creates the META-INF/manifest.mf
file in the jar and the second one creates the lib
folder in the existing target
directory and copies all the dependencies in there.第一个依赖项在 jar 中创建META-INF/manifest.mf
文件,第二个依赖项在现有target
目录中创建lib
文件夹并复制其中的所有依赖项。
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.ebayenterprise.ecp.jobs.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<!-- Build an executable JAR with runtime dependencies so that this program can be executed from command line using java -jar command -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.10</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
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