Name: ddT132432 Date: 09/25/2001
java version "1.3.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-b24)
Java HotSpot(TM) Client VM (build 1.3.1-b24, mixed mode)
Accessing Removable Drives through java.io.File causes java.exe to pop up a
dialog when no disk is inserted saying the drive is not available. This does
not happen on all computers. A description of an example computer is included
below. The problem is somewhere in the java native code, maybe in
FileSystem.checkAccess ?? One developer thinks it may only be a problem on
machines with SCSI devices, since it does not occur on all our machines, though
I have not verified that this is the case.
/******** START SOURCE **********************************************/
import java.io.File;
import java.util.Properties;
import java.util.Iterator;
import java.util.Set;
public class RootFileAccess {
public static void main(String args[]) {
Properties props = System.getProperties();
Set pSet = props.keySet();
Iterator iter = pSet.iterator();
while(iter.hasNext()) {
String next = (String)iter.next();
System.out.println(next + " == " + (String)props.get(next));
}
File[] roots = File.listRoots();
System.out.println("=================================");
for(int x=0; x<roots.length; x++) {
System.out.println("Drive " + x + ": " + roots[x].getAbsolutePath());
try {
System.out.println("Drive " + x + ": " + roots [x].getCanonicalPath());
} catch(Exception exc) {
System.out.println("Drive " + x + ": threw exception on cannonical path" );
exc.printStackTrace();
}
try {
if(roots[x].canRead()) {
System.out.println("Drive " + x + " is readable");
} else {
System.out.println("Drive " + x + " is NOT readable");
}
} catch(Exception exc) {
System.out.println("Drive " + x + ": threw exception on read check" );
exc.printStackTrace();
}
try {
if(roots[x].exists()) {
System.out.println("Drive " + x + " exists");
} else {
System.out.println("Drive " + x + " does NOT exist");
}
} catch(Exception exc) {
System.out.println("Drive " + x + ": threw exception on existence check" );
exc.printStackTrace();
}
try {
if(roots[x].isDirectory()) {
System.out.println("Drive " + x + " is directory");
} else {
System.out.println("Drive " + x + " is NOT directory");
}
} catch(Exception exc) {
System.out.println("Drive " + x + ": threw exception on directory check" );
exc.printStackTrace();
}
System.out.println("===================================");
}
}
}
/********** END SOURCE *********************************************/
/***** START OUTPUT *********/
D:\temp>java RootFileAccess
java.runtime.name == Java(TM) 2 Runtime Environment, Standard Edition
sun.boot.library.path == d:\java\jdk1.3.1\jre\bin
java.vm.version == 1.3.1-b24
java.vm.vendor == Sun Microsystems Inc.
java.vendor.url == http://java.sun.com/
path.separator == ;
java.vm.name == Java HotSpot(TM) Client VM
file.encoding.pkg == sun.io
java.vm.specification.name == Java Virtual Machine Specification
user.dir == D:\temp
java.runtime.version == 1.3.1-b24
java.awt.graphicsenv == sun.awt.Win32GraphicsEnvironment
os.arch == x86
java.io.tmpdir == C:\DOCUME~1\BMORIA~1\LOCALS~1\Templine.separator ==
java.vm.specification.vendor == Sun Microsystems Inc.
java.awt.fonts ==
os.name == Windows 2000
java.library.path == d:\java\jdk1.3.1\bin;.;C:\WINNT\System32;C:\WINNT;d:\usr\lo
cal\bin;d:\usr\bin;d:\java\jdk1.3.1\bin;d:\home\bmoriarty\bin;d:\usr\local\vim\v
im60aq;d:\java\jdk1.3.1\jre\bin\classic;d:\java\jakarta-ant-1.3\bin;d:\usr\perlbin;C:\WINNT\system32;d:\programs\DISA\dii_dev\bin;d:\home\bmoriarty\src\polexis
\xistm\bin;d:\home\bmoriarty\src\viking\bin;d:\home\bmoriarty\src\polexis\memtes
t\bin
java.specification.name == Java Platform API Specification
java.class.version == 47.0
os.version == 5.0
user.home == C:\Documents and Settings\bmoriarty
user.timezone ==
java.awt.printerjob == sun.awt.windows.WPrinterJob
file.encoding == Cp1252
java.specification.version == 1.3
java.class.path == .
user.name == bmoriarty
java.vm.specification.version == 1.0
java.home == d:\java\jdk1.3.1\jre
user.language == en
java.specification.vendor == Sun Microsystems Inc.
awt.toolkit == sun.awt.windows.WToolkit
java.vm.info == mixed mode
java.version == 1.3.1
java.ext.dirs == d:\java\jdk1.3.1\jre\lib\ext
sun.boot.class.path == d:\java\jdk1.3.1\jre\lib\rt.jar;d:\java\jdk1.3.1\jre\libi18n.jar;d:\java\jdk1.3.1\jre\lib\sunrsasign.jar;d:\java\jdk1.3.1\jre\classes
java.vendor == Sun Microsystems Inc.
file.separator == java.vendor.url.bug == http://java.sun.com/cgi-bin/bugreport.cgi
sun.io.unicode.encoding == UnicodeLittle
sun.cpu.endian == little
user.region == US
sun.cpu.isalist == pentium i486 i386
=================================================================
Drive 0: A:Drive 0: threw exception on cannonical path
java.io.IOException: The device is not ready
at java.io.Win32FileSystem.canonicalize(Native Method)
at java.io.File.getCanonicalPath(File.java:440)
at RootFileAccess.main(RootFileAccess.java:30)
Drive 0 is NOT readable
Drive 0 does NOT exist
Drive 0 is NOT directory
=================================================================
Drive 1: C:Drive 1: C:Drive 1 is readable
Drive 1 exists
Drive 1 is directory
=================================================================
Drive 2: D:Drive 2: D:Drive 2 is readable
Drive 2 exists
Drive 2 is directory
=================================================================
Drive 3: E:Drive 3: threw exception on cannonical path
java.io.IOException: The device is not ready
at java.io.Win32FileSystem.canonicalize(Native Method)
at java.io.File.getCanonicalPath(File.java:440)
at RootFileAccess.main(RootFileAccess.java:30)
Drive 3 is NOT readable
Drive 3 does NOT exist
Drive 3 is NOT directory
=================================================================
Drive 4: F:Drive 4: threw exception on cannonical path
java.io.IOException: The device is not ready
at java.io.Win32FileSystem.canonicalize(Native Method)
at java.io.File.getCanonicalPath(File.java:440)
at RootFileAccess.main(RootFileAccess.java:30)
Drive 4 is NOT readable
Drive 4 does NOT exist
Drive 4 is NOT directory
=================================================================
Drive 5: I:Drive 5: I:Drive 5 is readable
Drive 5 exists
Drive 5 is directory
=================================================================
D:\temp>
/******* END OUTPUT *********/
/******* START CONFIG INFO *********/
popups appear on A:\ and e:\ on the machine in the previous example, below
is a description of some of the drives on that machine.
a:type=Floppy disk drive
driver=c:\winnt\System32\DRIVERS\flpydisk.sys
c:\ and d:type=FUJITSU MAJ3182MP SCSI Disk Device
driver provider=Microsoft
e:type=IOMEGA ZIP 250
driver provider=MIcrosoft
f:type=SONY CD-RW CRX160E
driver=c:\WINNT\System32\DRIVERS\cdrom.sys
/******** END CONFIG INFO ***************/
(Review ID: 131512)
======================================================================