question: public Session startSshSessionAndObtainSession ( ) { Session session = null ; try { JSch jsch = new JSch ( ) ; if ( sshMeta . getSshLoginType ( ) == SshLoginType . KEY ) { String workingDir = System . getProperty ( "user.dir" ) ; String privKeyAbsPath = workingDir + "/" + sshMeta . getPrivKeyRelativePath ( ) ; logger . debug ( "use privkey: path: " + privKeyAbsPath ) ; if ( ! PcFileNetworkIoUtils . isFileExist ( privKeyAbsPath ) ) { throw new RuntimeException ( "file not found at " + privKeyAbsPath ) ; } if ( sshMeta . isPrivKeyUsePassphrase ( ) && sshMeta . getPassphrase ( ) != null ) { jsch . addIdentity ( privKeyAbsPath , sshMeta . getPassphrase ( ) ) ; } else { jsch . addIdentity ( privKeyAbsPath ) ; } } session = jsch . getSession ( sshMeta . getUserName ( ) , targetHost , sshMeta . getSshPort ( ) ) ; if ( sshMeta . getSshLoginType ( ) == SshLoginType . PASSWORD ) { session . setPassword ( sshMeta . getPassword ( ) ) ; } session . setConfig ( "StrictHostKeyChecking" , "no" ) ; } catch ( Exception t ) { throw new RuntimeException ( t ) ; } return session ; }
target:  Start ssh session and obtain session.