运行Jar文件时出现问题

Question

我已经将一个java项目编译成一个Jar文件,并且在运行它时遇到了问题.

当我跑:

java -jar myJar.jar

我收到以下错误

Could not find the main class: myClass

类文件不在jar的根目录中,所以我尝试更改主类的路径以匹配类文件的路径,我得到了同样的问题.

我应该扁平化文件结构吗？如果是这样我该怎么做 如果有任何用途,我正在使用Ant来构建Jar文件.

UPDATE

这是jar的内容和相关的Ant部分,我已经将我工作的公司名称改为"org":

META-INF/
META-INF/MANIFEST.MF
dataAccessLayer/
dataAccessLayer/databaseTest.class
org/
org/eventService/
org/eventService/DatabaseObject.class
org/eventService/DatabaseObjectFactory.class
org/eventService/DbEventClientImpl$HearBeatMonitor.class
org/eventService/DbEventClientImpl.class
org/eventService/EmptyQueryListException.class
org/eventService/EventHandlerWorkItem.class
org/eventService/EventProcessor.class
org/eventService/EventTypeEnum.class
org/eventService/EventWorkQueue$MonitorThread.class
org/eventService/EventWorkQueue$PoolWorker.class
org/eventService/EventWorkQueue.class
org/eventService/FailedToLoadDriverException.class
org/eventService/IConnectionFailureListener.class
org/eventService/InvalidEventTypeException.class
org/eventService/JdbcInterfaceConnection.class
org/eventService/NullArgumentException.class
org/eventService/OracleDatabaseObject.class
org/eventService/ProactiveClientEventLogger.class
org/eventService/ProactiveClientEventLoggerException.class
org/eventService/PropertyMap.class
org/eventService/SQLServerDatabaseObject.class
org/eventService/TestHarness.class
org/eventService/Utilities.class

而蚂蚁目标:

<target name="compile" depends="init" description="compile the source ">
    <javac srcdir="src" destdir="bin" classpathref="project.class.path"/>
</target>
<target name="buildjar" description="build jar file" depends="compile">
    <mkdir dir="dist"/>
    <jar destfile="dist/myJar.jar" basedir="bin" includes="**/*.class" >
        <manifest>
            <attribute name="Main-Class" value="org.eventService.ProactiveClientEventLogger"/>
        </manifest>
     </jar>
</target>

Answer 1

在清单文件中,确保将属性Main-Class设置为包含main()方法的类的名称.例如,如果类的包限定名称是my.cool.Class,Main-Class则应在JAR清单中将其设置为my.cool.Class.

还要确保您的.java文件中包含声明(例如,Class.java确保您具有正确的package my.cool;声明).另外,请确保您的目录层次结构已正确设置(my.cool.Class应该在$SRC/my/cool/Class.java).