We are using Cerberus FTP server. And for the client I am using SSH.NET library to connect to server and upload a file. I was able to connect and upload files to FTP server without issue most of the time.
However when destination path does not exists on the FTP server, the SSH.NET library throws exception as expected. However Exception's Message property is empty.
var sftpClient = new SftpClient(host,username,password);
sftp.connect();
var destination = "SomeInvalidPath\myfile.txt"
using (var fs = new FileStream(sourceFilePath, FileMode.Open, FileAccess.Read))
{
try
{
sftp.UploadFile(fs, destination);
}
catch (Exception ex)
{
// ex.Message is empty ???
Logger.Current.Error(ex, "Error while FTP");
}
}
Not sure if this SSH.NET library issue or FTP server needs to propagate errors back to client?
Update 1
Stack trace
" at Renci.SshNet.Sftp.SftpSession.RequestOpen(String path, Flags
flags, Boolean nullOnError)\r\n at
Renci.SshNet.SftpClient.InternalUploadFile(Stream input, String path,
Flags flags, SftpUploadAsyncResult asyncResult, Action1
uploadCallback)\r\n at Renci.SshNet.SftpClient.UploadFile(Stream
input, String path, Action1 uploadCallback)\r\n at XXXXXX
Related
I use the Hadoop's FileSystem class for deleting some HDFS files. The problem now is, that the client gets a Connection Timeout after a too long duration, I need to shrink the time to wait until the timeout, so that the user gets faster responses, if he/she is outside the network!
Here my codes snippet:
try {
System.setProperty("HADOOP_USER_NAME", "test");
Configuration conf = new Configuration();
File csvFile = new File(pathCsvFile);
FileSystem hdfs = FileSystem.get(new URI(csvFile.getPath(), conf);
if(hdfs.exists(new Path(filterValuesPath))) {
hdfs.delete(new Path(filterValuesPath), true);
setInfo("File deleted!");
} else {
setInfo("No file to delete!");
}
} catch (Exception ex) { // the timeout is too high!!!
ex.printStackTrace();
setInfo("No connection or no files to delete!");
}
Where and how can I set the timeout for my application? I don't want to change this in any Hadoop config files, just locally for my Java app. Thank you!
Installed the filezilla server and enabled the FTP over TLS Settings in Settings and started the server.
Through eclipse java client i tried to connect to server for upload and download the file using the below code
using commons-net apache library.
FTPSClient ftpClient = new FTPSClient(false);
// Connect to host
ftpClient.connect(mServer, mPort);
int reply = ftpClient.getReplyCode();
System.out.println("The reply code is "+reply);
if (FTPReply.isPositiveCompletion(reply)) {
// Login
if (ftpClient.login("******", "*******")) {
// Set protection buffer size
ftpClient.execPBSZ(0);
// Set data channel protection to private
ftpClient.execPROT("P");
// Enter local passive mode
ftpClient.enterLocalPassiveMode();
// Upload File using storeFile
File firstLocalFile = new File("e:/Test.txt");
String firstRemoteFile = "hello.txt";
InputStream is = new FileInputStream(firstLocalFile);
String result = getStringFromInputStream(is);
System.out.println(result);
Object output = ftpClient.storeFile(firstRemoteFile, is);
System.out.println(output);
is.close();
// Download File using retrieveFile(String, OutputStream)
String remoteFile1 = "/settings.xml";
File downloadFile1 = new File("e:/testOutput.xml");
OutputStream outputStream1 = new BufferedOutputStream(new FileOutputStream(downloadFile1));
boolean success = ftpClient.retrieveFile(remoteFile1, outputStream1);
outputStream1.close();
if (success) {
System.out.println("File #1 has been downloaded successfully.");
}
// Logout
ftpClient.logout();
// Disconnect
ftpClient.disconnect();
} else {
System.out.println("FTP login failed");
}
// Disconnect
ftpClient.disconnect();
} else {
System.out.println("FTP connect to host failed");
}
} catch (IOException ioe) {
System.out.println("FTP client received network error");
ioe.printStackTrace();
} catch (Exception nsae) {
System.out.println("FTP client could not use SSL algorithm");
nsae.printStackTrace();
}
It creates a file hello.txt on the server but size is of 0kb (source file size is 10 kb) and ended up the following error. Please help me to resolve this
javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
at sun.security.ssl.SSLSocketImpl.readRecord(Unknown Source)
at sun.security.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.security.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at org.apache.commons.net.ftp.FTPSClient._openDataConnection_(FTPSClient.java:619)
at org.apache.commons.net.ftp.FTPClient._storeFile(FTPClient.java:633)
at org.apache.commons.net.ftp.FTPClient.__storeFile(FTPClient.java:624)
at org.apache.commons.net.ftp.FTPClient.storeFile(FTPClient.java:1976)
at com.test.ftps.TestClass.main(TestClass.java:88)
Caused by: java.io.EOFException: SSL peer shut down incorrectly
at sun.security.ssl.InputRecord.read(Unknown Source)
... 9 more
just un-tick
"Require TLC session resumption on data connection..." in the filezilla server -> settings -> FTP over TLS Settings -> un-tick the Require TLC session resumption on data connection when using PROT P
In addition to user2750213's answer ( Filezilla's TLS session resumption ) beware to have the required protocols enabled. You can verify them running this code or this other on the jvm connecting to the FTPS server. Recent versions of Filezilla server use TLSv1.2.
If this works for you, you may get a java.net.SocketException: Unconnected sockets not implemented. In this case you need to write your own class which extends DefaultSocketFactory class and then set it to your FTPS client via method ftpsClient.setSocketFactory(yourSocketFactory) overriding the createSocket() method which must returns a new Socket()
I have the below code to SFTP to a location
public static void putFile(String username, String host, String password, String remotefile, String localfile){
JSch jsch = new JSch();
Session session = null;
try {
session = jsch.getSession(username, host, 22);
session.setConfig("StrictHostKeyChecking", "no");
session.setPassword(password);
session.connect();
Channel channel = session.openChannel("sftp");
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.put(localfile, remotefile);
sftpChannel.exit();
session.disconnect();
} catch (JSchException e) {
e.printStackTrace();
} catch (SftpException e) {
e.printStackTrace();
}
}
I am able to SFTP the document from my local machine using the above code. However when I am trying from a different environment to SFTP to the same location I am getting the follow error.
com.jcraft.jsch.JSchException: invalid server's version string at
com.jcraft.jsch.Session.connect(Session.java:253)
Note : I am using jsch-0.1.31.jar file.
on printing out session.getClientVersion() I am getting "SSH-2.0-JSCH-0.1.31".
I tried to upgrade the jar file to jsch-0.1.51.jar then session.getClientVersion() = "SSH-1.5-JSCH-0.1.51" and I am getting the following error
com.jcraft.jsch.JSchException: Session.connect: java.net.SocketException: Connection reset at com.jcraft.jsch.Session.connect(Session.java:558)
Please can you help me on what parameters should I be looking into and what is causing it to run from my local machine and upload to the same SFTP location and not from other environment?
As noted by #Kenster, the exception is about server's version string, not client's. The "invalid server's version string" exception is thrown by following code in Session.connect:
if(i==buf.buffer.length ||
i<7 || // SSH-1.99 or SSH-2.0
(buf.buffer[4]=='1' && buf.buffer[6]!='9') // SSH-1.5
){
throw new JSchException("invalid server's version string");
}
First, I would try to connect with some client that logs the version string and see yourself. For example with WinSCP, search its log for a pattern like:
. 2014-09-03 17:01:20.596 Server version: SSH-2.0-OpenSSH_5.3
(I'm the author of WinSCP)
Though possibly it's not about version string at all. I would rather believe the error raised by the new version, the Connection reset. The old version may fail to detect that the connection was aborted prematurely and tries to validate some random or incomplete data.
The Connection reset may indicate wide variety of different errors
Server refusing a connection from the other location
Some firewall or proxy not allowing the connection to pass through
I have an action that writes directly to the output stream. Sometimes I get the following to errors:
Error processing GroovyPageView: getOutputStream() has already been called for this response
Caused by getOutputStream() has already been called for this response
and this one:
Executing action [getImage] of controller [buddyis.ItemController] caused exception: Runtime error executing action
Caused by Broken pipe
How can I solve these problems? The action I use is listed below.
NOTE: I use Tomcat 7.0.42, if this is important!
def getImage() {
byte [] imageByteArray = // some image bytes
response.setHeader 'Content-disposition', "attachment; filename=\"${imageName}${imageExtension}\""
response.setContentType("image/pjpeg; charset=UTF-8")
response.contentLength = imageByteArray.size()
response.outputStream.write(imageByteArray)
response.outputStream.flush()
response.outputStream.close()
return
}
I don't know why you are getting that error, however here is what I do that works everytime.
I don't call .flush() or .close()
response.setContentType("application/octet-stream")
response.setHeader("Content-disposition", "filename=\"${name}\"")
response.setContentLength(imageByteArray.size())
response.outputStream << imageByteArray
Using the above it was working fine, until I found out a user can cancel a download, which caused an exception. This is the full code I use instead of response.outputStream << imageByteArray:
def outputStream = null
try {
outputStream = response.outputStream
outputStream << imageByteArray
} catch (IOException e){
log.debug('Canceled download?', e)
} finally {
if (outputStream != null){
try {
outputStream.close()
} catch (IOException e) {
log.debug('Exception on close', e)
}
}
}
I had this issue whilst running grails 2.5 on tomcat:7.0.55.3 and with the java-melody grails plugin installed. After uninstalling java-melody it worked just fine
I am using EWSJavaAPI 1.1.5. I am trying to login with invalid credentials, but I don't get any exceptions.
Please advise how to detect and handle invalid login.
Here is my code:
String host = "myhost";
ExchangeService service = null;
try {
service = new ExchangeService();
ExchangeCredentials credentials = new WebCredentials("wrongemail",
"wrongpass");
service.setCredentials(credentials);
service.setUrl(new java.net.URI("https://" + host
+ "/EWS/Exchange.asmx"));
} catch (Exception e) {
e.printStackTrace();
}
Found it, i had to bind the service to a folder:
Folder.bind(service, WellKnownFolderName.Inbox);
and if the credentials are wrong, HttpErrorException is thrown.