Java ProcessBuilder using periods in a string rather than slash when passing parameters

Question

I'm trying to open an xterm terminal in Java, and run a Java file in it. Here's the Java code that is opening up the terminal:

Process p2 = new ProcessBuilder("xterm", "-hold", "-e", "java", "/home/harry/main.class").start();

xterm opens fine, but it's saying that it can't find the main class home.harry.main.class. I'm using slashes, but they're being changed to dots. What am I doing wrong?

It's just main (not main.class); "java", "-cp", "/home/harry", "main" — Elliott Frisch
– Elliott Frisch, Commented Nov 20, 2015 at 2:59
+Hovercraft Of Eels it is a fully qualified java class. Its just that xterm thinks that the slashes im giving it are periods. Please read my full question. — RharryR
– RharryR, Commented Nov 20, 2015 at 3:00
I agree with Elliot. What happens when you run "xterm -hold -e java /home/harry/main.class" on the command line(or shell)? The way to invoke a java command is to let it know where to find the classes (using -cp) and then to let it know which class you want to run (package+class-name). — user2533521
– user2533521, Commented Nov 20, 2015 at 3:09

Community · Accepted Answer · 2017-05-23 10:27:18Z

1

The mention of xterm is misleading. The question (agreeing with @elliott-frisch and @user2533521) is how to run a Java class on the command-line. The full pathname and classfile name are two aspects which have to be separated.

Not quite a duplicate, these links can give some insight:

That is (referring to the documentation):

the "/home/harry" can be specified using the classpath -cp option (see Setting the class path).
the ".class" suffix is not useful; only the class name is used (probably "main").

edited May 23, 2017 at 10:27

CommunityBot

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answered Nov 21, 2015 at 17:44

Thomas Dickey

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