CODEWITHSUNDEEP
javajar
Rafael
Rafael

Reputation: 133

Problem with path in .jar file

I want to call a compiler (nonstandard) located in a folder inside my Java application. So I wrote this code:

Process p = Runtime.getRuntime().exec("closures/bin/javac " + filename);

It worked! But now I want to pack this compiler along with my .class files in a .jar file. My folder structure is something like that:

But when the line mentioned above from the jar file (the call to the compiler in a subfolder) is executed, I got this:

Exception in thread "main" java.io.IOException: Cannot run program "closures/bin/javac": java.io.IOException: error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:475)
at java.lang.Runtime.exec(Runtime.java:610)
at java.lang.Runtime.exec(Runtime.java:448)
at java.lang.Runtime.exec(Runtime.java:345)
at Main.main(Main.java:44)

Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
at java.lang.ProcessImpl.start(ProcessImpl.java:81)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:468)
... 4 more

It seem to me a path problem.

What am I doing wrong?

Thanks.

Upvotes: 3

Views: 1199

Answers (2)

J-16 SDiZ
J-16 SDiZ

Reputation: 26910

You cannot execute an executable in the jar file. You must extract it before calling Runtime.getRuntime().exec().

Think again, Runtime.getRuntime().exec() use your OS's function. Your OS don't know about .jar file. You have to extract it.

Upvotes: 2

Falmarri
Falmarri

Reputation: 48559

Just from your vague description, why do you think that your app's pwd is the same folder that closures is in? It looks to me like you're running it from .class, so you'll probably want AT LEAST 

Process p = Runtime.getRuntime().exec("../closures/bin/javac " + filename);

but that's still not the most robust way of calling it.

Upvotes: 0

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