CODEWITHSUNDEEP
javaprocessbuilder
Steve
Steve

Reputation: 4695

ProcessBuilder launch main method in same project

I have a Java class that needs to kick off a child process. The child process is a class containing a main() method within the same project. I have:

Class clazz = RunMQCommands.class;

String separator = System.getProperty("file.separator");
String classpath = System.getProperty("java.class.path");
String path = System.getProperty("java.home");

ProcessBuilder pb = 
        new ProcessBuilder(path, "-cp", 
        classpath, 
        clazz.getCanonicalName());
pb.redirectErrorStream(true);
Process process = pb.start();
int retCode = process.waitFor();

And this gives me a 

CreateProcess error=5, Access is denied

This is my first foray into ProcessBuilder. What am I doing wrong? I can kick off external things just fine (e.g. new ProcessBuilder("notepad"))

Upvotes: 2

Views: 577

Answers (1)

Sotirios Delimanolis
Sotirios Delimanolis

Reputation: 280172

Your path variable will have a value of something like

/usr/share/Java/1.8/jre

That is not an executable file.

Find the location of your executable java file and give the value of that to your path variable.

Your ProcessBuilder should look like

ProcessBuilder pb = 
    new ProcessBuilder("/usr/share/Java/1.8/jre/java", "-cp", 
    classpath, 
    clazz.getCanonicalName());

Upvotes: 1

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