OS : Solaris 9/10 (japanese locale(LOCALE=ja))
     WindowsXP(SP2, Japanese)
JDK : 6.0u2/JDK7b16

REPRODUCE : 
 1) Compile the attached test program
 2) Invoke "java Command"
 3) Please look at the message when IOException occurs in java.lang.Runtime#exec
    (The test program tests other cases. The licensee focus on the IOException message.)

 This does not occur in 1.3.1, 1.4.2_XX and 5.0ux.

NOTE : 
 The test program checks several cases. The above issues occurs in IOException check.
 

INVESTIGATION :

[j2se/src/solaris/native/java.lang/UNIXProcess_md.c]
 .....
  static void
  throwIOException(JNIEnv *env, int errnum, const char *defaultDetail)
  {
      static const char * const format = "error=%d, %s";
      const char *detail = defaultDetail;
      char *errmsg;
      if (errnum != 0) {
	  const char *s = strerror(errnum);
	  if (strcmp(s, "Unknown error") != 0)
	      detail = s;
      }
      /* ASCII Decimal representation uses 2.4 times as many bits as binary. */
      errmsg = NEW(char, strlen(format) + strlen(detail) + 3 * sizeof(errnum));
      sprintf(errmsg, format, errnum, detail);
      JNU_ThrowIOException(env, errmsg);
      free(errmsg);
  }
  .....

The return value(Japanese EUC encoding ) from strerr() is used in UTF-8.
That's why the error message can not be displayed correctly.


OTHERS:
 Please see the strong requests in "comment section".