How can the error stream of a process be printed or outputted in Java?

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In Java, the standard error stream of a process can be printed or outputted using the getErrorStream() method of the Process class. This method returns an InputStream that can be read to obtain the error output of the process.

To print the error stream to the console, one can use a BufferedReader to read the InputStream and print each line using System.out.println(). Here is an example code snippet:

ProcessBuilder pb = new ProcessBuilder("command", "arg1", "arg2");
Process process = pb.start();
InputStream errorStream = process.getErrorStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(errorStream));
String line;
while ((line = reader.readLine()) != null) {
   System.out.println(line);
}

This code creates a new Process object using ProcessBuilder, starts it, and gets its error stream using the getErrorStream() method. It then creates a BufferedReader to read the stream, reads each line of the stream using readLine() method, and prints each line to the console using System.out.println().