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POJava's System.getRuntime().exec not behaving as if the shell user called it
 

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  1. POJava's System.getRuntime().exec not behaving as if the shell user called it
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    <p>I am running a java application from the console on an HP-UX machine. In it, I generate some reports, zip them, and then email them. Everything is working, except the email.</p> <p>I am using the mail binary to send mail from the command line. Since it's HP-UX, it's a bit different than the standard GNU sendmail.</p> <p>This is the code I'm using to send the mail:</p> <pre><code> public static void EmailReports(String[] recipients, String reportArchive, String subject){ SimpleDateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy"); String today = dateFormat.format(new Date()); File tempEmailFile; BufferedWriter emailWriter; try { tempEmailFile = File.createTempFile("report_email_" + today, "msg"); emailWriter = new BufferedWriter(new FileWriter(tempEmailFile)); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not create temporary file."); return; } try { emailWriter.write("SUBJECT: " + subject + "\n"); emailWriter.write("FROM: " + FROM + "\n"); emailWriter.write(BODY + "\n"); emailWriter.close(); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not write to temporary file."); } //read the archive in try { FileInputStream archiveIS = new FileInputStream(new File(reportArchive)); OutputStream archiveEncoder = MimeUtility.encode(new FileOutputStream(tempEmailFile, true), "uuencode", Zipper.getArchiveName(reportArchive)); //read archive byte[] buffer = new byte[archiveIS.available()]; //these should never be more than a megabyte or two, so storing it in memory is no big deal. archiveIS.read(buffer); //encode archive archiveEncoder.write(buffer); //close both archiveIS.close(); archiveEncoder.close(); } catch (FileNotFoundException e) { System.out.println("Failed to send email. Could not find archive to email."); e.printStackTrace(); } catch (MessagingException e) { System.out.println("Failed to send email. Could not encode archive."); e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not encode archive."); } System.out.println("Sending '" + subject + "' email."); try { Process p = Runtime.getRuntime().exec("mail me@example.com &lt; " + tempEmailFile.getAbsolutePath()); System.out.println("mail me@example.com &lt; " + tempEmailFile.getAbsolutePath()); StringBuffer buffer = new StringBuffer(); while(p.getErrorStream().available() &gt; 0){ buffer.append((char) p.getErrorStream().read()); } System.out.println("STDERR: " + buffer.toString()); buffer = new StringBuffer(); while(p.getInputStream().available() &gt; 0){ buffer.append((char) p.getInputStream().read()); } System.out.println("STDOUT: " + buffer.toString()); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not get access to the shell."); } } </code></pre> <p>When I run the program, and it sends the email, I get a blank email, no subject, no body, no attachment, and it's from the user@hostname from the HP-UX box instead of from the email specified in <code>FROM</code>.</p> <p>However, when I run the same line that it runs (see the command printed out after I call exec), I get the correct email, from the correct user, with a subject, body, and attachment.</p> <p>STDOUT and STDERR are both empty. It's almost as if I'm sending mail a blank file, but when I print the file before I call the exec, it's there.</p> <p>What's going on here?</p> <p>Edit: Attempts made:</p> <p>Using Ksh:</p> <pre><code> try { String cmd = "mail me@example.com.com &lt; " + tempEmailFile.getAbsolutePath(); Runtime.getRuntime().exec(new String[] {"/usr/bin/ksh", cmd}); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not get access to the shell."); } </code></pre> <p>Using STDIN:</p> <pre><code> try { System.out.println("mail me@example.com &lt; " + tempEmailFile.getAbsolutePath()); Process p = Runtime.getRuntime().exec("mail me@example.com "); FileInputStream inFile = new FileInputStream(tempEmailFile); byte[] byteBuffer = new byte[inFile.available()]; inFile.read(byteBuffer); p.getOutputStream().write(byteBuffer); inFile.close(); p.getOutputStream().close(); StringBuffer buffer = new StringBuffer(); while(p.getErrorStream().available() &gt; 0){ buffer.append((char) p.getErrorStream().read()); } System.out.println("STDERR: " + buffer.toString()); buffer = new StringBuffer(); while(p.getInputStream().available() &gt; 0){ buffer.append((char) p.getInputStream().read()); } System.out.println("STDOUT: " + buffer.toString()); } catch (IOException e) { e.printStackTrace(); System.out.println("Failed to send email. Could not get access to the shell."); } </code></pre>
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