Hi all,
In 2009-06-08 I opened a post with that content:
===========
I use jsch to transfer data via sftp from one server to another.
I noticed that there remain some deamon(?) threads after data-transfers.
...com.jcraft.jsch.Session.run(Session.java:1193)
java.lang.Thread.run(Thread.java:619)....
I close every connection using a own disconnect-method in this way:
public void disconnect() {
if ( sftpConnection != null ) {
sftpConnection.disconnect();
sftpConnection = null;
}
if ( sftpSession != null ) {
sftpSession.disconnect();
sftpSession = null;
}
}
Maybe I do a mistake to close the session properly.
What's the right way to avoid such waiting threads ?
===========
So today there's still the same problem but now I can reproduce the
problem with a small test-application and now I can show a thread-dump
for that moment.
That's the reproducable situation:
I have an application with a main-tread within I start a new thread for
every sftp-connection to list the directory on a remote host.
After listing is gone, there's still a thread for each connection?! I
close connection with the disconnect() method above, but a thread is
still alive.
That's the thread-dump in the situation for two connections.
~~~~~~~~~~~~~ thread dump ~~~~~~~~~~~~~~
C:\Programme\Java\jdk1.6.0_16\bin>jstack 6140
2010-04-13 11:46:47
Full thread dump Java HotSpot(TM) Client VM (14.2-b01 mixed mode):
"Connect thread myHost session" prio=6 tid=0x0b062800 nid=0x1304
runnable [0x0b
20f000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.jcraft.jsch.IO.getByte(IO.java:82)
at com.jcraft.jsch.Session.read(Session.java:811)
at com.jcraft.jsch.Session.run(Session.java:1195)
at java.lang.Thread.run(Thread.java:619)
"Connect thread myHost session" prio=6 tid=0x0b02b800 nid=0x634 runnable
[0x0b1
bf000]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.jcraft.jsch.IO.getByte(IO.java:82)
at com.jcraft.jsch.Session.read(Session.java:811)
at com.jcraft.jsch.Session.run(Session.java:1195)
at java.lang.Thread.run(Thread.java:619)
"Low Memory Detector" daemon prio=6 tid=0x0aab8400 nid=0x740 runnable
[0x0000000
0]
java.lang.Thread.State: RUNNABLE
"CompilerThread0" daemon prio=10 tid=0x0aab6000 nid=0xdc8 waiting on
condition [
0x00000000]
java.lang.Thread.State: RUNNABLE
"JDWP Command Reader" daemon prio=6 tid=0x0aaa8c00 nid=0xb20 runnable
[0x0000000
0]
java.lang.Thread.State: RUNNABLE
"JDWP Event Helper Thread" daemon prio=6 tid=0x0aaa7000 nid=0x1708
runnable [0x0
0000000]
java.lang.Thread.State: RUNNABLE
"JDWP Transport Listener: dt_socket" daemon prio=6 tid=0x0aaa4800
nid=0x598 runn
able [0x00000000]
java.lang.Thread.State: RUNNABLE
"Attach Listener" daemon prio=10 tid=0x0aa99400 nid=0x1668 waiting on
condition
[0x00000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x0aa98000 nid=0xce8 runnable
[0x00000000
]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=8 tid=0x0aa89000 nid=0x16e0 in Object.wait()
[0x0abff000
]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x02e8d448> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <0x02e8d448> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at
java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x0aa84400 nid=0x13d4 in
Object.wait() [0
x0abaf000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x02e8d1f8> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at
java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x02e8d1f8> (a java.lang.ref.Reference$Lock)
"main" prio=6 tid=0x00376c00 nid=0x16c0 runnable [0x0090f000]
java.lang.Thread.State: RUNNABLE
at de.juris.MainClass.main(MainClass.java:51)
"VM Thread" prio=10 tid=0x0aa80400 nid=0xf4c runnable
"VM Periodic Task Thread" prio=10 tid=0x0aaba400 nid=0x156c waiting on
condition
JNI global references: 2153
~~~~~~~~~~~~~~~ END ~~~~~~~~~~~~~~~~~~~~~~~~~
I hope that helps and I hope that someone can explain the problem or my
mistake and of course a solution ;-)
Thanks,
Markus
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