Implementing restartApplication method in Java

**davidvee** · August 10th, 2012, 09:18 AM

I attempted to implement my own version of a restartApplication method I found on the internet. All I added was the location of my javabin and the location of a jar file for it to relaunch. I also made the method static so I don't have to create an object to call it.

When I run my program, it runs fine up until the point it is supposed to restart. Instead of restarting, I get this error:

java.io.IOException: Cannot run program "null\bin\java": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(ProcessBuilder.java :1029)
at TreeChartUI.restartApplication(TreeChartUI.java:54 3)
at TreeChartUI.main(TreeChartUI.java:596)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:189)
at java.lang.ProcessImpl.start(ProcessImpl.java:133)
at java.lang.ProcessBuilder.start(ProcessBuilder.java :1021)
... 2 more

Here is my attempt at the restart method.

public static void restartApplication()
{
    final String javaBin = System.getProperty("C:\\Program Files\\Java\\jdk1.7.0_05\\bin") + File.separator + "bin" + File.separator + "java";
    final File currentJar = new File("C:\\Somefolder\\someJar.jar");//new File(UpdateReportElements.class.getProtectionDomain().getCodeSource().getLocation().toURI());
 
  /* is it a jar file? */
    if(!currentJar.getName().endsWith(".jar"))
    return;
 
  /* Build command: java -jar application.jar */
    final ArrayList<String> command = new ArrayList<String>();
    command.add(javaBin);
    command.add("-jar");
    command.add(currentJar.getPath());
 
    final ProcessBuilder builder = new ProcessBuilder(command);
    try{
    builder.start();
    }
    catch (IOException e) {
 
                  // TODO Auto-generated catch block
 
                  e.printStackTrace();
 
            }
    System.exit(0);
    }

**copeg** · August 10th, 2012, 09:59 AM

Does your computer have the fule path "null\bin\java"? It looks to me something is null in the construction of the path, I'd bet it has to do with the attempt to get the System property....see the list of properties you can access
System Properties (The Java™ Tutorials > Essential Classes > The Platform Environment)

**davidvee** · August 10th, 2012, 10:13 AM

Originally Posted by copeg

Does your computer have the fule path "null\bin\java"? It looks to me something is null in the construction of the path, I'd bet it has to do with the attempt to get the System property....see the list of properties you can access
System Properties (The Java™ Tutorials > Essential Classes > The Platform Environment)

I'm not sure what you mean by having the full path. Would it be possible to avoid the getProperty method alltogether by just giving it the String path of my javaBin? I tried changing the line from

final String javavBin = System.getProperty("C:\\Program Files\\Java\\jdk1.7.0_05\\bin") + File.separator + "bin" + File.separator + "java";

To

    final String javaBin = "C:\\Program Files\\Java\\jdk1.7.0_05\\bin";

But I got this error. I don't see why my access would be denied.

java.io.IOException: Cannot run program "C:\Program Files\Java\jdk1.7.0_05\bin": CreateProcess error=5, Access is denied
at java.lang.ProcessBuilder.start(ProcessBuilder.java :1029)
at TreeChartUI.restartApplication(TreeChartUI.java:54 3)
at TreeChartUI.main(TreeChartUI.java:596)
Caused by: java.io.IOException: CreateProcess error=5, Access is denied
at java.lang.ProcessImpl.create(Native Method)
at java.lang.ProcessImpl.<init>(ProcessImpl.java:189)
at java.lang.ProcessImpl.start(ProcessImpl.java:133)
at java.lang.ProcessBuilder.start(ProcessBuilder.java :1021)
... 2 more

**Norm** · August 10th, 2012, 11:02 AM

java.io.IOException: Cannot run program "C:\Program Files\Java\jdk1.7.0_05\bin"

The path looks like it's to a folder NOT to an executable file. Should there be a command (like java.exe) at the end of the path?

To see what system properties might be useful try this

		Properties props = System.getProperties();
		props.list(System.out);

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