我有一个应用程序,我正在尝试将其包装到 jar 中以便于部署。当作为一组可从 CLASSPATH 访问的类运行时,应用程序可以编译并正常运行(在 Windows cmd 窗口中)。但是当我打包我的类并尝试在同一个 cmd 窗口中使用 java 1.6 运行它时,我开始遇到异常:
C:\dev\myapp\src\common\datagen>C:/apps/jdk1.6.0_07/bin/java.exe -classpath C:\myapp\libs\commons -logging-1.1.jar -server -jar DataGen.jar
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at com.example.myapp.fomc.common.datagen.DataGenerationTest.<clinit>(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
... 1 more
有趣的是,有问题的 LogFactory 似乎位于 commons-logging-1.1.jar 中,它位于指定的类路径中。 jar 文件(是的,它确实在那里):
C:\dev\myapp\src\common\datagen>dir C:\myapp\libs\commons-logging-1.1.jar
Volume in drive C is Local Disk
Volume Serial Number is ECCD-A6A7
Directory of C:\myapp\libs
12/11/2007 11:46 AM 52,915 commons-logging-1.1.jar
1 File(s) 52,915 bytes
0 Dir(s) 10,956,947,456 bytes free
commons-logging-1.1.jar 文件的内容:
C:\dev\myapp\src\common\datagen>jar -tf C:\myapp\libs\commons-logging-1.1.jar
META-INF/
META-INF/MANIFEST.MF
org/
org/apache/
org/apache/commons/
org/apache/commons/logging/
org/apache/commons/logging/impl/
META-INF/LICENSE.txt
META-INF/NOTICE.txt
org/apache/commons/logging/Log.class
org/apache/commons/logging/LogConfigurationException.class
org/apache/commons/logging/LogFactory$1.class
org/apache/commons/logging/LogFactory$2.class
org/apache/commons/logging/LogFactory$3.class
org/apache/commons/logging/LogFactory$4.class
org/apache/commons/logging/LogFactory$5.class
org/apache/commons/logging/LogFactory.class
... (more classes in commons-logging-1.1 ...)
是的,commons-logging 有 LogFactory 类。最后,我的 jar 清单的内容:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.5
Created-By: 10.0-b23 (Sun Microsystems Inc.)
Main-Class: com.example.myapp.fomc.common.datagen.DataGenerationTest
Class-Path: commons-logging-1.1.jar commons-lang.jar antlr.jar toplink
.jar GroboTestingJUnit-1.2.1-core.jar junit.jar
这让我和我已经骚扰了一天多的同事们感到困惑。只是为了找出答案,至少现在,由于许可限制和公司政策(例如:用于创建 exe 或打包 jar 的工具),第三方解决方案可能已经消失。最终目标是创建一个 jar,可以从我的开发 Windows 机器复制到 Linux 服务器(带有任何依赖的 jar)并用于填充数据库(因此开发环境和部署环境之间的类路径可能会有所不同)。任何有关这个谜团的线索将不胜感激!