我有一個使用net.schmizz.sshj SFTP庫的夜間工作。timeout at net.schmizz.sshj.transport.KeyExchanger.waitForDone（KeyExchanger.java:160）
我懷疑我們SFTP進入的服務器有變化。但是，我無法確定確切的變化是什麼。我也不能在生產服務器之外重現它。所以我要尋找一個根本原因的見解或如何重現以下錯誤
net.schmizz.sshj.transport.TransportException: Timeout expired at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:33) at net.schmizz.sshj.transport.TransportException$1.chain(TransportException.java:27) at net.schmizz.concurrent.Promise.retrieve(Promise.java:139) at net.schmizz.concurrent.Event.await(Event.java:103) at net.schmizz.sshj.transport.KeyExchanger.waitForDone(KeyExchanger.java:160) at net.schmizz.sshj.transport.KeyExchanger.startKex(KeyExchanger.java:155) at net.schmizz.sshj.transport.TransportImpl.doKex(TransportImpl.java:247) at net.schmizz.sshj.SSHClient.doKex(SSHClient.java:735) at net.schmizz.sshj.SSHClient.onConnect(SSHClient.java:723) at net.schmizz.sshj.SocketClient.connect(SocketClient.java:54) at net.schmizz.sshj.SocketClient.connect(SocketClient.java:80)
從我可以告訴，我們通過連接java.net.Socket確定，然後超時等待交換密鑰完成此代碼
package net.schmizz.sshj.transport;
/** Algorithm negotiation and key exchange. */
final class KeyExchanger
implements SSHPacketHandler, ErrorNotifiable {
/**
* Starts key exchange by sending a {@code SSH_MSG_KEXINIT} packet. Key exchange needs to be done once mandatorily
* after initializing the {@link Transport} for it to be usable and may be initiated at any later point e.g. if
* {@link Transport#getConfig() algorithms} have changed and should be renegotiated.
*
* @param waitForDone whether should block till key exchange completed
*
* @throws TransportException if there is an error during key exchange
* @see {@link Transport#setTimeoutMs} for setting timeout for kex
*/
void startKex(boolean waitForDone)
throws TransportException {
if (!kexOngoing.getAndSet(true)) {
done.clear();
sendKexInit();
}
if (waitForDone)
waitForDone();
}
/**
* Sends SSH_MSG_KEXINIT and sets the {@link #kexInitSent} event.
*
* @throws TransportException
*/
private void sendKexInit()
throws TransportException {
log.debug("Sending SSH_MSG_KEXINIT");
clientProposal = new Proposal(transport.getConfig());
transport.write(clientProposal.getPacket());
kexInitSent.set();
}
void waitForDone()
throws TransportException {
done.await(transport.getTimeoutMs(), TimeUnit.MILLISECONDS);
}