I've been struggling for a while now with this problem and i can't seem to fix it. i already have tried different approaches (Runtime.exec(), ProcessBuiler) but none seem to work.
This is my issue. I have a laptop which is always on. This laptop runs a java tool connected to an arduino via usb to turn on and off the lights in the house. i have created this program myself, therefore i'm also doing some regular maintenance work on it. Recently i have added a button to restart the program from my html interface (in case i have an update, or if for some other reason i might need to restart the program or i decide to implement auto updating in the near future).
This idea behind this is to start a second instance of the application from the first instance and then System.exit(0) the first instance.
For some reason i'm not able to start a second instance of the application. Here's some code.
public void shutdown(boolean restart) {
if (this.serial != null) {
this.serial.disconnect();
}
if (restart) {
System.out.println(this.getClass().getProtectionDomain().getCodeSource().getLocation().getPath());
String startupCommand = "java -jar \"" + this.getClass().getProtectionDomain().getCodeSource().getLocation().getPath().replace("%20", " ") + "\"";
ProcessBuilder builder = new ProcessBuilder();
// String[] command = new String[1];
// command[0] = "-jar \"" + (System.getProperty("user.dir") + "/Home_Automation_Executor.jar") + "\"";
try {
// //System.out.println("Restarting Home Automation with command: " + command[0]);
// System.out.println("Restarting Home Automation with command: " + startupCommand);
// Runtime.getRuntime().exec("bash");
// Process proc = Runtime.getRuntime().exec(startupCommand);
Process proc = builder.command(startupCommand).start();
InputStream stderr = proc.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;
System.out.println("<ERROR>");
while ((line = br.readLine()) != null) {
System.out.println(line);
}
System.out.println("</ERROR>");
int exitVal = 0;
try {
exitVal = proc.waitFor();
} catch (InterruptedException ex) {
Logger.getLogger(Engine.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println("Process exitValue: " + exitVal);
} catch (IOException ex) {
ex.printStackTrace();
}
}
System.out.println("Terminating Home Automation");
System.exit(0);
}
java.io.IOException: Cannot run program "java -jar "/Users/NightWalker/Dropbox/Development/Source Code/Java/NightWare Tools/Home Automation/Home Automation Executor/dist/Home_Automation_Executor.jar"": error=2, No such file or directory at java.lang.ProcessBuilder.start(ProcessBuilder.java:460) at home.automation.executor.Engine.shutdown(Engine.java:186) at home.automation.executor.webserver.HTTPGenerator._handleActionCommand(HTTPGenerator.java:190) at home.automation.executor.webserver.HTTPGenerator._generateHTTPPage(HTTPGenerator.java:165) at home.automation.executor.webserver.HTTPGenerator.getHTTPPage(HTTPGenerator.java:58) at home.automation.executor.webserver.HTTPRequestHandler.run(HTTPRequestHandler.java:160) Caused by: java.io.IOException: error=2, No such file or directory at java.lang.UNIXProcess.forkAndExec(Native Method) at java.lang.UNIXProcess.(UNIXProcess.java:53) at java.lang.ProcessImpl.start(ProcessImpl.java:91) at java.lang.ProcessBuilder.start(ProcessBuilder.java:453) ... 5 more
The problem is this:
String startupCommand = "java -jar \"" + this.getClass().getProtectionDomain().getCodeSource().getLocation().getPath().replace("%20", " ") + "\"";
/* more stuff */ builder.command(startupCommand);
This means Jav will look for a command named java -jar ...stuff with spaces.... But what you want is, that Java looks for a command named java and give that command several parameters.
You should use
/*...*/ builder.command("java", "-jar", jarLocation) /*...*/