Her er et uddrag fra java's buge reports.
http://developer.java.sun.com/developer/bugParade/bugs/4171239.htmlBug Id 4171239
Votes 32
Synopsis java.io.File.deleteOnExit does not work on open files (win32)
Category java:classes_io
Reported Against 1.2fcs, 1.2.2, kestrel-rc2, 1.3, 1.3.1
Release Fixed
State In progress, bug
Related Bugs
Submit Date Sep 03, 1998
Description If the File.deleteOnExit method is invoked on a File object, and one or more
instances of FileInputStream, FileOutputStream, or RandomAccessFile are open on
the file at the time the VM exits, then the file will not be deleted. This
occurs only on win32, which does not allow a file to be deleted until all
streams on it have been closed. -- xxxxx@xxxxx 9/3/1998
java version "1.3.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)
In the code below, the line that is commented-out causes the temporary file to
not be deleted on JVM exit. If the line is uncommented, the file does get
deleted.
Possibly the garbage collection for a RandomAccessFile should close the file
just in case it was not closed. If Java had destructors, the destructor for
this class would make sure to close the RandomAccessFile.
----------
import java.io.*;
public class DeleteTest {
private static String FILE_PREFIX = "inet";
private File tempFile;
private RandomAccessFile raf;
public DeleteTest() {
try {
tempFile = File.createTempFile(FILE_PREFIX, null);
System.out.println("TEMPFILE = " +
tempFile.getAbsolutePath());
raf = new RandomAccessFile(tempFile, "rw");
tempFile.deleteOnExit();
DbByteArrayOutputStream bout = new
DbByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(bout);
String testStr = new String("TEST STRING");
out.writeObject(testStr);
out.flush();
bout.writeTo(raf);
bout.close();
//raf.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String args[]) {
DeleteTest app = new DeleteTest();
}
public class DbByteArrayOutputStream extends ByteArrayOutputStream {
public DbByteArrayOutputStream() {
super();
}
public DbByteArrayOutputStream(int size) {
super(size);
}
public synchronized void writeTo(DataOutput dstr) throws
IOException {
byte[] data = super.buf;
int len = super.size();
dstr.write(data, 0, len);
}
}
}
(Review ID: 105968)
webbug tony_lapaso jay95
Workaround
Make sure you close any file for which the deleteOnExit() method
was/is called.
(Review ID: 103452)
Must open and close the RandomAccessFile each time we need to access it. Cannot
just open it in a constructor and leave it open.
(Review ID: 105968)
Evaluation Too risky to fix for 1.2fcs. Suggested fix probably requires a JVM change.
Lowering priority to 4 since we've found an alternative fix for the immediate
problem of temporary zip files not being deleted. -- xxxxx@xxxxx 9/9/1998
Så du bliver nødt til explicit at lukke hver fildescriptor. Hvilket du ikke kan når du bruger loadlibrary.
Jeg vil tro arne v's måde at løse problemet på er den bedste løsning.
