在cygwin中将多个jar文件设置为类路径

Question

I have the program x.java in c:\\cygwin\\programs\\x.java and it uses y.jar and z.jar that are also in the folder c:\\cygwin\\programs .

In windows:

c:cygwin\programs>javac -classpath c:\cygwin\programs\y.jar;c:\cygwin\programs\z.jar x.java

No errors.

In cygwin

(1)

$javac -classpath c\:/cygwin/programs/y.jar;c\:/cygwin/programs/z.jar x.java 

Errors: $'PK\003\004': Command not found.

(2)

$javac -classpath c:\cygwin\programs\y.jar;c:\cygwin\programs\z.jar x.java 

Errors: -bash command Command not found.

(3)

$javac -classpath 'c:/cygwin/programs/y.jar;c:/cygwin/programs/z.jar' x.java

No error.

Why is it giving error in case of (1),(2)...

Answer 1

You are messing up with escape character back-slash \\ . In Unix based environment, it's better to use / as path separator. If you want to use backlashes for some reason, use an additonal backslash ie \\\\ to treat it as literal in the path.

Because of above, first tow statements are not resulting into correct path and hence failure.

Answer 2

Cygwin treats the ; character as starting a new command line, so in (1) it is trying to execute the separate commands

$ javac -classpath c\:/cygwin/programs/y.jar
$ c\:/cygwin/programs/z.jar x.java

The error message is from Cygwin trying to execute the jar file directly as a script.

You can quote the entire argument with '' as in (3), or escape the semicolon:

$ javac -classpath c\:/cygwin/programs/y.jar\;c\:/cygwin/programs/z.jar x.java