Java argument is unrecognized

Question

I'm trying to start another Java process from my jar, and I'm using a ProcessBuilder:

File javaHome = new File(System.getProperty("java.home"), "bin");
List<String> javaList = new ArrayList<String>();

ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.redirectErrorStream(true);
processBuilder.directory(serverDir);
{
    javaList.add(javaHome + File.separator + "java");
    javaList.add("-XX:MaxPermSize=512m");
    javaList.add("-Xmx2048M");

    // -Djava.library.path="natives-win-x64/"
    javaList.add(
        String.format(                          
            "-Djava.library.path=\"natives-%s-%s/\"", 
            //Get system os, 
            //Get system arch
        )
    );

    {
        String classPath = new String();
        for (File library : scanLibrary(new File(serverDir, "libraries"))) {
            String libPath = library.getPath();
            classPath += libPath + ";";
        }

        classPath += new File(new File(serverDir, "binary"), "MainJar.jar").getPath();
        javaList.add("-classpath \\\"" + classPath + "\\\" ");
    }

    javaList.add("my.other.jar.main.class");
}
processBuilder.command(javaList);
processBuilder.start();

Error: Could not create the Java Virtual Machine. Error: A fatal exception has occurred. Program will exit. Unrecognized option: -classpath "C:\Absoulte\Path\Library.jar;C:\Absoulte\Path2\Library2.jar;C:\Absoulte\Path3\Library3.jar"

Jon Skeet · Accepted Answer · 2014-12-18 15:24:34Z

2

You're passing --classpath "..." as a single argument. I believe you should specify it as two arguments:

javaList.add("-classpath");
javaList.add("\\\"" + classPath + "\\\");

(It's not clear to me whether you really need all those backslashes, by the way... you may well find that just javaList.add(classPath) is enough, or maybe javaList.add("\"" + classPath + "\"").)

answered Dec 18, 2014 at 15:24

Jon Skeet

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