CODEWITHSUNDEEP
javaclasspath
phil swenson
phil swenson

Reputation: 8894

Setting classpath java for use in Runtime.exec

I am trying to spawn a process using Runtime.exec. I want to use my current classpath : System.getProperty("java.class.path")

Unfortunately, I am having all kinds of issues. When it works on my mac, it doesn't work on Windows. And doesn't work on my mac ever when there is a space in the classpath. The error I always get is ClassDefNotFound, so it's related to how I'm building and passing in the classpath.

here is some sample code:

String startClass = "com.test.MyClass"
String javaHome = System.getProperty("java.home");
String javaCmd = javaHome + "/bin/java";
String classPath = "-Djava.class.path=" + System.getProperty("java.class.path");
String[] commands = new String[]{javaCmd, classPath, startClass};
String commandString = StringUtils.join(commands, " ");
Process process = Runtime.getRuntime().exec(commandString);

So, how should I setup the classpath?

Thanks for any help

Upvotes: 2

Views: 2277

Answers (1)

bmargulies
bmargulies

Reputation: 100023

You need to aim for the overload of 'exec' that takes String[], not String. And you have use the correct path separator from the File class, so that you have colons on Linux and semicolons on Windows.

Upvotes: 1

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