I guess the issue is that you are only reading InputStream and not reading ErrorStream. You also have to take care that both the streams are read in parallel. It may so happen that currently the data piped from the output stream fills up the OS buffer, your exec command will be automatically be suspended … Read more
I presume you are running these chmod commands in a loop – otherwise I don’t see why you’d get so many exceptions. It’s possible that you’re hitting a deadlock because you’re not reading the output of the spawned processes. That certainly used to bite me back in the pre-ProcessBuilder, Runtime.exec() days. Change your code snippet … Read more
This can’t be done with ProcessBuilder, you will need to call Windows API. I’ve used JNA to achieve this with code similar to the following: Shell32X.java: import com.sun.jna.Native; import com.sun.jna.Pointer; import com.sun.jna.Structure; import com.sun.jna.WString; import com.sun.jna.platform.win32.Shell32; import com.sun.jna.platform.win32.WinDef.HINSTANCE; import com.sun.jna.platform.win32.WinDef.HWND; import com.sun.jna.platform.win32.WinNT.HANDLE; import com.sun.jna.platform.win32.WinReg.HKEY; import com.sun.jna.win32.W32APIOptions; public interface Shell32X extends Shell32 { Shell32X INSTANCE = … Read more
To use it with ProcessBuilder you must separate the commands like this: final List<String> commands = new ArrayList<String>(); commands.add(“cmd.exe”); commands.add(“/C”); commands.add(“start”); ProcessBuilder pb = new ProcessBuilder(commands); pb.start();
Read from the InputStream. You can append the output to a StringBuilder: BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream())); StringBuilder builder = new StringBuilder(); String line = null; while ( (line = reader.readLine()) != null) { builder.append(line); builder.append(System.getProperty(“line.separator”)); } String result = builder.toString();
You are trying to execute /home and it is not an executable file. The constructor argument of the process builder is the command to execute. You want to set the working directory. You can that it via the directory method. Here is a complete example: Process p = null; ProcessBuilder pb = new ProcessBuilder(“do_foo.sh”); pb.directory(new … Read more
If the process writes to stderr or stdout, and you’re not reading it – it will just “hang” , blocking when writing to stdout/err. Either redirect stdout/err to /dev/null using a shell or merge stdout/err with redirectErrorStream(true) and spawn another thread that reads from stdout of the process
accepted answer by jverd on OTN Yes, there are other ways. Is this way not meeting your needs? There’s another exec() signature that takes an array, where the first element is the command and the rest of the elements are its args. It may or may not be a varargs call. That would look something … Read more
Since Java 9 class Process has new method long pid(), so it is as simple as ProcessBuilder pb = new ProcessBuilder(“cmd”, “/c”, “path”); try { Process p = pb.start(); long pid = p.pid(); } catch (IOException ex) { // … }
The Runtime.getRuntime().exec() approach is quite troublesome, as you’ll find out shortly. Take a look at the Apache Commons Exec project. It abstracts you way of a lot of the common problems associated with using the Runtime.getRuntime().exec() and ProcessBuilder API. It’s as simple as: String line = “myCommand.exe”; CommandLine commandLine = CommandLine.parse(line); DefaultExecutor executor = new … Read more