Logs not visible for nested batch files called from java ProcessBuilder

When running nested batch files called from Java using ProcessBuilder, the standard output and standard error streams of the nested batch files may not be visible by default. This is because the nested batch files are executed as separate processes, and their output is not directly captured by the parent Java process.

To capture and display the logs from the nested batch files, you can redirect the output streams of the child processes to the parent Java process. Here's an example:

javaCopy code
import java.io.IOException;

import java.util.List;



public class BatchFileExample {



    public static void main(String[] args) throws IOException, InterruptedException {

        ProcessBuilder processBuilder = new ProcessBuilder("cmd.exe", "/C", "nested.bat");

        processBuilder.redirectErrorStream(true); // Redirect error stream to output stream

        Process process = processBuilder.start();



        // Read the output of the child process

        java.io.InputStream inputStream = process.getInputStream();

        java.io.BufferedReader reader = new java.io.BufferedReader(new java.io.InputStreamReader(inputStream));

        String line;

        while ((line = reader.readLine()) != null) {

            System.out.println(line);

        }



        int exitCode = process.waitFor();

        System.out.println("Exit Code: " + exitCode);

    }



}

In this example, the nested batch file nested.bat is executed using cmd.exe with the /C flag. The redirectErrorStream(true) method is called on the ProcessBuilder to redirect the error stream to the output stream.

The output stream of the child process is then read and printed in the parent Java process using a BufferedReader.

By redirecting the output streams and reading them in the parent Java process, you can capture and display the logs from the nested batch files executed through ProcessBuilder.

Make sure to modify the code according to your specific requirements and handle exceptions appropriately.