在Cygwin上运行Java程序-找不到类路径 [英] Running Java Program on Cygwin - classpath not found

问题描述

我有一个简单的Java程序，可以打印出我的类路径。文件夹结构如下：

I have a simple Java program that prints out my classpath. Folder structure is as follows:

[~/tmp/bin]# ls
launcher/  PrintClasspath.class*

同级副本又向下一层。

[~/tmp/bin/launcher]# ls
PrintClasspath.class*

当我跳到〜/ tmp 目录并运行 PrintClasspath 在我的〜/ tmp / bin 目录中，我可以很好地运行该程序，并声明 ./ bin 为

When I jump up to my ~/tmp directory and run PrintClasspath in my ~/tmp/bin directory, I can run the program just fine, stating ./bin as the classpath.

[~/tmp]# java -cp "./bin" PrintClasspath
/C:/Cygwin/home/user/tmp/bin/

或者我可以运行嵌套在〜/ tmp / bin / launcher 目录，如果我按如下方式编辑类路径：

Or I can run the same file I nested in the ~/tmp/bin/launcher directory if I edit the classpath as follows:

[~/tmp]# java -cp "./bin/launcher" PrintClasspath
/C:/Cygwin/home/user/tmp/bin/launcher/

但是当我尝试坐在我的〜/ tmp 目录中并尝试在〜/ tmp / bin / launcher 目录中取消我的班级，并以 ./ bin 作为我的班级路径，并在该类通过以下方式定位：

But when I try to sit in my ~/tmp directory, and try to run my class in the ~/tmp/bin/launcher directory with ./bin as my classpath and qualify where the class is located via the following:

[~/tmp]# java -cp "./bin" launcher.PrintClasspath
Error: Could not find or load main class launcher.PrintClasspath

失败。我已经在Linux机器上运行了相同的测试，并且在给一个类路径多个目录后，限定了该类在子目录中的位置，效果很好。

It FAILS. I've run the same test on my Linux box, and qualifying where the class is located in a sub-directory after giving a classpath multiple directories up works fine.

I最初假定这是Windows / Cygwin的细微差别，但是我在Windows命令提示符下尝试了相同的练习，并获得了相同的结果。我在这里缺少什么。我只需要使用完全限定的类路径来运行Windows Java程序吗？

I originally assumed this was a Windows/Cygwin nuance, but I tried the same exercise in Windows command prompt and same result. What am I missing here.do I just have to run my Windows Java programs with a fully qualified classpath?

推荐答案

已解决：什么时候？使用Java的Windows版本在Cygwin中设置类路径，必须使用 cygpath 实用程序以及选项 -wp 来将Unix样式路径转换为Windows路径。

Solved: When setting the classpath in Cygwin using the Windows version of Java, you have to use the cygpath utility with options -wp to convert the unix style paths to Windows paths.

[~/tmp]# java -cp `cygpath -wp ./bin` launcher.PrintClasspath
/C:/Cygwin/home/user/tmp/bin/

（通过此）

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