jQuery in Action, 3rd edition
The moose likes Java in General and the fly likes Using Runtime.getRuntime to run java Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login

Win a copy of Java Interview Guide this week in the Jobs Discussion forum!
JavaRanch » Java Forums » Java » Java in General
Bookmark "Using Runtime.getRuntime to run java" Watch "Using Runtime.getRuntime to run java" New topic

Using Runtime.getRuntime to run java

cardwell cupp
Ranch Hand

Joined: Aug 16, 2001
Posts: 66
I am using
Runtime.getRuntime.exec("javac " + path + file)
to compile a java file...it works just fine.
Then when I use the same code to run it,
Runtime.getRuntime.exec("java " + path + class)
it comes back with a NoClassDeff error. Doesn't that usually mean that the classpath is not set correctly? But if I can do it with javac then why not java?
Cindy Glass
"The Hood"

Joined: Sep 29, 2000
Posts: 8521
Is the JVM putting the output class file in the classpath?

"JavaRanch, where the deer and the Certified play" - David O'Meara
Jim Yingst

Joined: Jan 30, 2000
Posts: 18671
My guess: use the -d option of javac to make javac create the class files in appropriate directories for their packages. E.g. if Test.java has a class Test in package mypkg, then
<pre>javac -d classdir Test.java</pre>
will create the file in classdir/mypkg/Test.class. I've never figured out why this isn't automatic, but you need to specify the option.

"I'm not back." - Bill Harding, Twister
I agree. Here's the link: http://aspose.com/file-tools
subject: Using Runtime.getRuntime to run java
It's not a secret anymore!