java – 运行时未找到jar中的类,但用于编译

Do I have to manually change my classpath in my shell when running the jar as well as change it in the ant build?

是的,一点没错.在编译时使类可用不会将类嵌入到输出或类似的东西中.它只是让它可供编译器使用(找出存在的方法等).

If I add the jars to my classpath using java -cp j3d/*.jar -jar idv.jar

是的,它会 – 因为它正在扩展为：

java -cp j3d/foo.jar j3d/bar.jar ... -jar idv.jar

鉴于this documentation,我不清楚-cp是否适用于-jar：

When you use this option,the JAR file is the source of all user classes,and other user class path settings are ignored.

一个选项是set the classpath within the manifest of the jar file itself.例如：

Class-Path: j3d/foo.jar j3d/bar.jar

另一种方法是暂时忽略-jar命令行选项,并使用：

java -cp j3d/*:idv.jar your.class.name.Here

注意*而不是* .jar,如下所示：

As a special convenience,a class path element containing a basename of * is considered equivalent to specifying a list of all the files in the directory with the extension .jar or .JAR (a java program cannot tell the difference between the two invocations).