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File misbehaving with Unicode Surrogate Pairs

Posted on 2009-05-08
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Last Modified: 2012-05-06
I have two scenarios:

#1) I can create a file using a different program (not java) and java is unable to read this file
#2) Java can't create a file using a unicode surrogate pair.

I've tried this on solaris and Macosx, using HFS and NFS, both local and over TCP.

this was saved properly in UTF-8 and was executed using -Dfile.encoding="UTF-8"

See the file below, in one I use the actual char, in the other I use the encoded version (both should work out to the same UTF8 String).

Why can't java open or create this file? What am I doing wrong? I *know* the filesystem can deal with the file, since I can create it using a different mechanism.
public class FreakinUTF8{
    public static void main(String args[]){
      String tmp = "/tmp/\uD85C\uDD0D.txt";
      //String tmp = "/tmp/\
.txt";//this is the encoded char.
      File newFile = new File(tmp);
      boolean b = false;
      try {
        b = newFile.createNewFile();
        System.out.println("Created:"+b+" and exists:"+newFile.exists());
      } catch (IOException e) {
        e.printStackTrace();
      }
 
    }
  }

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Question by:kylar
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Expert Comment

by:CEHJ
ID: 24339757
It's OK for me. See below:
goose@seegobin:/tmp$ ll
total 68
drwxrwxrwt  9 root  root  4096 2009-05-08 21:04 .
drwxr-xr-x 22 root  root  4096 2009-04-13 09:09 ..
-rw-r--r--  1 goose goose  973 2009-05-08 20:59 FreakinUTF8.class
-rw-r--r--  1 goose goose  421 2009-05-08 20:59 FreakinUTF8.java
drwx------  3 goose goose 4096 2009-05-08 17:12 gconfd-goose
drwxr-xr-x  2 goose goose 4096 2009-05-08 21:01 hsperfdata_goose
drwxrwxrwt  2 root  root  4096 2009-05-08 17:12 .ICE-unix
drwx------  2 goose goose 4096 2009-05-08 17:12 orbit-goose
drwx------  2 goose goose 4096 2009-05-08 19:16 plugtmp
-rw-------  1 goose goose  981 2009-05-08 21:04 purple3GGPTU
-rw-------  1 goose goose  106 2009-05-08 17:12 serverauth.iRnPqXRSMp
drwx------  2 goose goose 4096 2009-05-08 17:12 ssh-UrGtFI2893
-r--r--r--  1 root  root    11 2009-05-08 17:12 .X0-lock
drwxrwxrwt  2 root  root  4096 2009-05-08 17:12 .X11-unix
-rw-------  1 goose goose  207 2009-05-08 17:12 .xfsm-ICE-H69RTU
goose@seegobin:/tmp$ java FreakinUTF8
Created:true and exists:true
goose@seegobin:/tmp$ ll
total 68
drwxrwxrwt  9 root  root  4096 2009-05-08 21:05 .
drwxr-xr-x 22 root  root  4096 2009-04-13 09:09 ..
-rw-r--r--  1 goose goose  973 2009-05-08 20:59 FreakinUTF8.class
-rw-r--r--  1 goose goose  421 2009-05-08 20:59 FreakinUTF8.java
drwx------  3 goose goose 4096 2009-05-08 17:12 gconfd-goose
drwxr-xr-x  2 goose goose 4096 2009-05-08 21:05 hsperfdata_goose
drwxrwxrwt  2 root  root  4096 2009-05-08 17:12 .ICE-unix
drwx------  2 goose goose 4096 2009-05-08 17:12 orbit-goose
drwx------  2 goose goose 4096 2009-05-08 19:16 plugtmp
-rw-------  1 goose goose  981 2009-05-08 21:04 purple3GGPTU
-rw-------  1 goose goose  106 2009-05-08 17:12 serverauth.iRnPqXRSMp
drwx------  2 goose goose 4096 2009-05-08 17:12 ssh-UrGtFI2893
-rw-r--r--  1 goose goose    0 2009-05-08 21:05 \
.txt
-r--r--r--  1 root  root    11 2009-05-08 17:12 .X0-lock
drwxrwxrwt  2 root  root  4096 2009-05-08 17:12 .X11-unix
-rw-------  1 goose goose  207 2009-05-08 17:12 .xfsm-ICE-H69RTU

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Expert Comment

by:CEHJ
ID: 24339766
Unfortunately the character doesn't work on this site, but i can tell you it's there
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Author Comment

by:kylar
ID: 24339904
What kind of box are you running it on? What kind of storage?
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LVL 92

Expert Comment

by:objects
ID: 24342129
what version of java are you using? Have you tried latest?

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Expert Comment

by:objects
ID: 24342147
it used to be a problem but was fixed ages ago

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4845710

what result exactly are you getting?

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Author Comment

by:kylar
ID: 24366991
I've tried with 1.5 and 1.6 on Solaris & MacOSX. I get this result on:

MacOSX when using locally attached HFS storage
MacOSX when using remote NFS storage
Solaris when using remote NFS storage

but not Solaris using local NFS storage.

I get an IOException when I run it:

Exception in thread "main" java.io.IOException: No such file or directory
      at java.io.UnixFileSystem.createFileExclusively(Native Method)
      at java.io.File.createNewFile(File.java:883)
      at UTF8Test.<init>(UTF8Test.java:20)
      at SymlinkTest.main(SymlinkTest.java:3)

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Expert Comment

by:CEHJ
ID: 24367487
Do you get the same errors *outside Java*
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Expert Comment

by:objects
ID: 24370115
I'd suggest raising a bug with Sun

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Accepted Solution

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kylar earned 0 total points
ID: 24830160
I've raised a bug with Apple, since they are the ones who do the MacOSX jdk.
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Expert Comment

by:objects
ID: 24830220
sorry yes apple :)
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