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  1. JDK
  2. JDK-4255453

win95 Runtime.exec() backslash quoting requirements are inconsistent with 98/NT

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: 1.3.0
    • Fix Version/s: None
    • Component/s: core-libs
    • Labels:
      None
    • Subcomponent:
    • CPU:
      generic, x86
    • OS:
      windows_95

      Description

      It appears that the quoting requirements for backslash are inconsistent between
      Windows95, Windows98, and WindowsNT. In some cases, the backslash is
      interpreted so we must add extra "\" for later processing and in other cases it
      is not. This causes difficulties in setting environment variables for calling
      Runtime.exec() in code which must run on all three platforms.

      In the following example, java.net.InetAddress.getLocalHost() requires windir
      (for 95 and 98) or SystemRoot (for NT) to be set. If the environment variable
      is not not defined properly then the DNS lookup will fail and an
      UnknownHostException will be thrown. Please refer to the comments within the
      code for details on which backslash quoting convention is required for each
      platform.

      STEPS TO REPRODUCE:
      1. $ javac QuoteBackslash.java
      2. $ javac GetLocalHost.java
      3. $ java QuoteBackslash
          [ modify declaration of "env" for different platforms as necessary ]

      FILE: QuoteBackslash.java

      import java.io.BufferedReader;
      import java.io.IOException;
      import java.io.InputStreamReader;

      public class QuoteBackslash {
          public static void main(String [] args) {
        String [] cmd = {"l:\\jdk1.3\\win32\\bin\\java",
      "-classpath",
      ".",
        "GetLocalHost"};

      // 95 - ok
      //String [] env = {"windir=c:\\windows"};
      // 95 - not ok
      String [] env = {"windir=c:\\\\windows"};

      // 98 - not ok???
      //String [] env = {"windir=c:\\windows"};
      // 98 - ok
      //String [] env = {"windir=c:\\\\windows"};

      // NT - ok
      //String [] env = {"SystemRoot=c:\\winnt"};
      // NT - ok
      //String [] env = {"SystemRoot=c:\\\\winnt"};

      Process p = null;
      try {
      p = Runtime.getRuntime().exec(cmd, env);
      //p = Runtime.getRuntime().exec(cmd);
      int exitCode = p.waitFor();

      String line;

      BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
      while ((line = in.readLine()) != null)
      System.out.println(line);
      in.close();

      BufferedReader err = new BufferedReader(new InputStreamReader(p.getErrorStream()));
      while ((line = err.readLine()) != null)
      System.out.println(line);
      err.close();

      //System.out.println("*** exit code: " + exitCode);
      } catch (InterruptedException e) {
      if (p != null)
      p.destroy();
      } catch (IOException e) {
      e.printStackTrace();
      }
          }
      }

      FILE: GetLocalHost.java

      import java.net.*;

      public class GetLocalHost {
          static InetAddress addr;

          public static void main(String args[]) throws Exception {
              addr = InetAddress.getLocalHost();
              System.out.println("ADDR: " + addr);
          }
      }

      OUTPUT (win95):

      // "windir=c:\\windows"
      [I:/work/bug/runtime] l:/java/jdk1.3/win32/bin/java QuoteBackslash
      ADDR: kaveri.eng.sun.com/129.144.125.120

      // "windir=c:\\\\windows"
      [I:/work/bug/runtime] l:/java/jdk1.3/win32/bin/java QuoteBackslash
      java.net.UnknownHostException: kaveri.eng.sun.com
              at java.net.InetAddress.getAllByName0(InetAddress.java:579)
              at java.net.InetAddress.getAllByName0(InetAddress.java:548)
              at java.net.InetAddress.getAllByName(InetAddress.java:541)
              at java.net.InetAddress.getLocalHost(InetAddress.java:731)
              at GetLocalHost.main(GetLocalHost.java:10)
      Exception in thread "main"


      Earlier tests seem to indicate that this inconsistency exists at least as far
      back as JDK1.1.6. This behaviour is particularly problematic since it is
      impossible to distinguish 95 from 98 in Cricket.

      The behaviour in NT or 98 is preferable.

      iris.garcia@eng 1999-07-19

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              Assignee:
              hongzh Hong Zhang
              Reporter:
              iris Iris Clark
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