Consider the following String command:
C:\TS\Veit\Test\python\Python-3.6.9\python.exe -m pip install -r C:\TS\Veit\Test\python\packages\requirements.txt --find-links --no-index > C:\TS\Veit\Test\python\logs\python.log 2>&1
This command install python and its packages based on the requirements file requirements.txt, and then put the output of the command (both stdout and stderr) in a file called python.log.
When I run this command on Windows from the command line, it works perfectly, and I have my python.log file created with all the logs. However, when I run it from java, the command doesn't create the python.log file.
Two ways I have tried so far:
1. Using Runtime exec:
Runtime.getRuntime().exec(script_WINDOWS);
With script_windows equals to: pythonInterpreter+" -m pip install -r "+requirementsFilePath+" --find-links "+pathToPackages+" --no-index > "+ pythonLogFileLocation +File.separator+"python.log 2>&1"
Which is exactly the same command I put above.
With this method, Runtime does install python for me but I have no python.log file created.
2. Using ProcessBuilder:
ProcessBuilder builder = new ProcessBuilder(script_WINDOWS);
builder.redirectErrorStream(true);
Process p = builder.start();
BufferedReader r = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line;
while (true) {
line = r.readLine();
if (line == null) { break; }
FileUtils.writeStringToFile(FileUtils.getFile(pythonLogFileLocation+"python.log"), line, "UTF-8");
FileUtils.writeStringToFile(FileUtils.getFile(pythonLogFileLocation+"python.log"), "\n", "UTF-8");
}
This method ends in the following error:
java.io.IOException: Cannot run program "C:\TS\Veit\Test\python\Python-3.6.9\python.exe -m pip install -r C:\TS\Veit\Test\python\packages\requirements.txt --find-links C:\TS\Veit\Test\python\packages --no-index > C:\TS\Veit\Test\python\logs\python.log 2>&1": CreateProcess error=2, The system cannot find the file specified
Since the command works perfectly from the command line, I think it's the way I'm trying to execute it from Java that is causing the problem of the python.log file not being created. Any help would be appreciated.
