executing the customs command on linux with proces

Question

I've been struggling for a while now with this problem and i can't seem to fix it. i have tried ProcessBuilder for executing the custom command on linux terminal but its not working

Actually i have two .sh file setProto.sh and setTls.sh file which is used to set the environment.So for executing the command i need to run these two file first for each instance of linux terminal.Only then we can be able to run the custom command anloss on the same instance of linux terminal in which .sh file supposed to run.For some reason i'm not able to make it work what is the mistake in my code ? Here's the code.

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.ProcessBuilder.Redirect;

public class EngineTest {

    public static void main(String[] args) {
        try {
            ProcessBuilder builder = new ProcessBuilder(
                    "/. setProto.sh",
                    "/. setTls.sh",
                    "/anloss -i ${TOOL_INPUT}/census_10000_col5.csv  -d ${TOOL_DEF}/attr_all_def.txt -q k=14,dage=2 -g ${TOOL_RES}/census_100_col8_gen.csv");
            builder.directory(new File(System.getenv("HOME") + "/PVproto/Base"));
            File log = new File("log");
            builder.redirectErrorStream(true);
            builder.redirectOutput(Redirect.appendTo(log));
            Process process = builder.start();

            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(process.getInputStream()));
            String line = "";
            String output = "";
            while ((line = bufferedReader.readLine()) != null) {
                output += line + "\n";
            }
            System.out.println(output);
            int exitValue = process.waitFor();
            System.out.println("\n\nExit Value is " + exitValue);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

Answer 1

I think you need to use Runtime.exec() for executing the commands on linux. I suppose you are executing your java code on linux machine where linux scripts needs to be run.

Below code snippet will help you in resolving it.

Process process = Runtime.getRuntime().exec(scriptWithInputParameters);
int exitCode = process.waitFor();
if (exitCode == 0) {
    System.out.println("Executed successfully");
}
else {
  System.out.println("Failed ...");
}

Please note you need to handle error and output stream in different threads to avoid buffer overflow.

If the above works for you then this article will help you further

Answer 2

Process does not by default execute in the context of a shell; therefore your shell scripts cannot be executed the way you tried.

ProcessBuilder pb =
    new ProcessBuilder( "/bin/bash",
                        "-c", 
                        ". setProto.sh && . setTls.sh && /anloss -i ${TOOL_INPUT}/census_10000_col5.csv  -d ${TOOL_DEF}/attr_all_def.txt -q k=14,dage=2 -g ${TOOL_RES}/census_100_col8_gen.csv" );

I am not sure about /anloss - it's unusual for a command to be in root's home /. (Also, the /. you had there in front of the shell scripts - what should they achieve?)

Later

Make sure to replace /anloss with an absolute pathname or a relative pathname relative to $HOME/PVproto/Base, e.g., if it is in this directory, use ./anloss, if it is in $HOME/PVproto/Base/SomeSub, use SomeSub/anloss, etc.

Also, if setProto.sh and . setTls.sh are not in $HOME/PVproto/Base, use an appropriate absolute or relative pathname. If they are, use ./setProto.sh and ./setTls.sh to avoid dependency on the setting of environment variable PATH.