Hi,
A project I've begun to maintain has been having problems with staging
files using VFS.
I have extracted the relevant code bits into a simple app. The app takes
an argument
of the type "ftp://<host>:<port>/<file>" and expects an anonymous Ftp
server to be running at the given address.
When the project uses its original version of VFS -
commons-vfs-1.0-SNAPSHOT.jar the
problem is:
"Could not determine if file "ftp://host:port/output"; is writable" - the
exception is thrown from
FileObject.getContent().getOuputStream(false) ("Do 3" line in the app).
I get the same error even if I try FileObject.createFile().
This happens if the actual file does not exist, however, if an empty
file is created these two methods complete successfully.
I found a similar post in the archives from 31 July'06, but no one
responded to it.
When I switch to more recent 'commons-vfs-1.1-SNAPSHOT.jar' or
'commons-vfs-1.0.jar' the problem is:
"java.lang.StackOverflowError" - the exception is thrown from
FileSystemManager.resolveFile(file) ("Do 1" line in the app).
I found a post suggesting that could be a bug with JDK fixed in the
latest versions, but I get the same problem when I try with
JDK 1.5.0_10-b03 and 1.6.0-b105.
thnx
Vesso
Java App
********************************
/**
* Main.java
*
* Created on 28 February 2007, 17:40
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
package vfstest;
import java.io.OutputStream;
import org.apache.commons.vfs.FileObject;
import org.apache.commons.vfs.cache.NullFilesCache;
import org.apache.commons.vfs.impl.DefaultFileSystemManager;
import org.apache.commons.vfs.provider.ftp.FtpFileProvider;
/**
*
* @author vesso
*/
public class Main {
/** Creates a new instance of Main */
public Main() {
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
System.out.println( "ENTER MAIN" );
try {
DefaultFileSystemManager xInstance = new DefaultFileSystemManager();
xInstance.setFilesCache(new NullFilesCache());
xInstance.addProvider("ftp", new FtpFileProvider());
xInstance.init();
System.out.println( "Do 1" );
FileObject xFileObject = xInstance.resolveFile( args[ 0 ] );
System.out.println( "Do 2" );
System.out.println( xFileObject.exists() );
System.out.println( "Do 3" );
//xFileObject.createFile();
OutputStream xOs = xFileObject.getContent().getOutputStream( false );
System.out.println( "Do 4" );
System.out.println( xFileObject.exists() );
} catch ( Throwable exc ) {
System.out.println( "CAUGHT EXCEPTION: " + exc.toString() );
exc.printStackTrace();
} finally {
System.out.println( "EXIT MAIN" );
}
}
}
********************************
FileWrite Error
********************************
ENTER MAIN
Do 1
Do 2
false
Do 3
CAUGHT EXCEPTION: org.apache.commons.vfs.FileSystemException: Could not determine if file
"ftp://<host>:<port>/output.txt" is writeable.
org.apache.commons.vfs.FileSystemException: Could not determine if file
"ftp://<host>:<port>/output.txt" is writeable.
at
org.apache.commons.vfs.provider.AbstractFileObject.isWriteable(AbstractFileObject.java:475)
at
org.apache.commons.vfs.provider.AbstractFileObject.getOutputStream(AbstractFileObject.java:1127)
at
org.apache.commons.vfs.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:367)
at vfstest.Main.main(Main.java:48)
Caused by: org.apache.commons.vfs.FileSystemException: Could not determine if file
"ftp://<host>:<port>/" is writeable.
at
org.apache.commons.vfs.provider.AbstractFileObject.isWriteable(AbstractFileObject.java:475)
at
org.apache.commons.vfs.provider.AbstractFileObject.isWriteable(AbstractFileObject.java:468)
... 3 more
Caused by: org.apache.commons.vfs.FileSystemException: Could not determine the type of file
"ftp://<host>:<port>/".
at
org.apache.commons.vfs.provider.AbstractFileObject.attach(AbstractFileObject.java:1235)
at
org.apache.commons.vfs.provider.AbstractFileObject.isWriteable(AbstractFileObject.java:458)
... 4 more
Caused by: java.lang.NullPointerException
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:262)
at
org.apache.commons.vfs.provider.AbstractFileObject.getParent(AbstractFileObject.java:503)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.getInfo(FtpFileObject.java:174)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.doAttach(FtpFileObject.java:166)
at
org.apache.commons.vfs.provider.AbstractFileObject.attach(AbstractFileObject.java:1221)
... 5 more
EXIT MAIN
********************************
StackOverflowError
********************************
ENTER MAIN
Do 1
CAUGHT EXCEPTION: java.lang.StackOverflowError
java.lang.StackOverflowError
at java.lang.Class.privateGetDeclaredMethods(Class.java:2382)
at java.lang.Class.getMethod0(Class.java:2642)
at java.lang.Class.getMethod(Class.java:1579)
at
org.apache.commons.logging.LogFactory.getContextClassLoader(LogFactory.java:438)
at org.apache.commons.logging.LogFactory$1.run(LogFactory.java:222)
at java.security.AccessController.doPrivileged(Native Method)
at org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:218)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.<init>(FtpFileObject.java:53)
at
org.apache.commons.vfs.provider.ftp.FtpFileSystem.createFile(FtpFileSystem.java:156)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:296)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
at
org.apache.commons.vfs.provider.AbstractFileSystem.getRoot(AbstractFileSystem.java:242)
at
org.apache.commons.vfs.provider.AbstractFileObject.getParent(AbstractFileObject.java:510)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.getInfo(FtpFileObject.java:177)
at
org.apache.commons.vfs.provider.ftp.FtpFileObject.refresh(FtpFileObject.java:208)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:319)
at
org.apache.commons.vfs.provider.AbstractFileSystem.resolveFile(AbstractFileSystem.java:267)
. . . .
. . . .
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