com.maverick.ssh

Class SshException

java.lang.Object

java.lang.Throwable

java.lang.Exception

com.maverick.ssh.SshException

All Implemented Interfaces:

Serializable

public class SshException
extends Exception

Generic exception for J2SSH Maverick exception handling. When an exception is thrown a reason is attached to the exception so that the developer can determine if its possible to proceed with the connection.

This

Author:

Lee David Painter

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Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	AGENT_ERROR An error has occurred within the agent.
static int	BAD_API_USAGE The API has encountered an error because of incorrect usage.
static int	CANCELLED_CONNECTION The user cancelled the connection.
static int	CHANNEL_FAILURE Indicates that a channel has failed; this is used by channel implementations (such as port forwarding or session channels) to indicate that the channel has critically failed.
static int	CONNECT_FAILED The connection could not be established.
static int	CONNECTION_CLOSED An attempt has been made to use a connection that has been closed and is no longer valid.
static int	FORWARDING_ERROR An error has occurred the port forwarding system.
static int	INTERNAL_ERROR An internal error occurred within the API; in all cases contact sshtools.com support with the details of this error and the state of the connection when receiving this exception is unknown.
static int	JCE_ERROR An error occurred in the JCE; typically this would result from Maverick attempting to use an algorithm that the JCE does not support.
static int	KEY_EXCHANGE_FAILED The protocol failed to negotiate a transport algorithm or failed to verify the host key of the remote host.
static int	LICENSE_ERROR The API is not licensed!
static int	MESSAGE_TIMEOUT An expected message was not received before the specified timeout period.
static int	POSSIBLE_CORRUPT_FILE An error occurred reading the contents of a file.
static int	PROMPT_TIMEOUT The Shell class failed to detect the prompt.
static int	PROTOCOL_VIOLATION The SSH protocol was violated in some way by the remote host and the connection has been terminated.
static int	PSEUDO_TTY_ERROR A request was made to allocate a pseudo terminal, but this request failed.
static int	REMOTE_HOST_DISCONNECTED The remote host disconnected following the normal SSH protocol disconnection procedure.
static int	SCP_TRANSFER_CANCELLED The user cancelled an active SCP transfer.
static int	SESSION_STREAM_ERROR An error occurred whilst accessing a sessions streams
static int	SHELL_ERROR A request was made to start a shell, but this request failed.
static int	SOCKET_TIMEOUT The API detected a socket timeout
static int	UNEXPECTED_TERMINATION The connection unexpectedly terminated and so the connection can no longer be used.
static int	UNSUPPORTED_ALGORITHM In setting up a context an algorithm was specified that is not supported by the API.

Constructor Summary

Constructors

Constructor and Description
SshException(int reason, Throwable cause) Create an exception with the given cause and reason.
SshException(String msg, int reason) Create an exception with the given description and reason.
SshException(String msg, int reason, Throwable cause) Create an exception with the given description cause, reason.
SshException(String msg, Throwable cause) Create an exception with the given description and cause.
SshException(Throwable cause) Create an exception by providing the cause of the error.
SshException(Throwable cause, int reason)

Method Summary

Methods

Modifier and Type	Method and Description
Throwable	getCause() If an INTERNAL_ERROR reason is given this method MAY return the cause of the error.
int	getReason() Get the reason for the exception

Methods inherited from class java.lang.Throwable

addSuppressed, fillInStackTrace, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

UNEXPECTED_TERMINATION

public static final int UNEXPECTED_TERMINATION

The connection unexpectedly terminated and so the connection can no longer be used. The exception message will contain the message from the exception that caused the termination.

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Constant Field Values

REMOTE_HOST_DISCONNECTED

public static final int REMOTE_HOST_DISCONNECTED

The remote host disconnected following the normal SSH protocol disconnection procedure. The exception message will contain the message received from the remote host that describes the reason for the disconnection

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Constant Field Values

PROTOCOL_VIOLATION

public static final int PROTOCOL_VIOLATION

The SSH protocol was violated in some way by the remote host and the connection has been terminated. The exception message will contain a description of the protocol violation.

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Constant Field Values

BAD_API_USAGE

public static final int BAD_API_USAGE

The API has encountered an error because of incorrect usage. The state of the connection upon receiving this exception is unknown.

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Constant Field Values

INTERNAL_ERROR

public static final int INTERNAL_ERROR

An internal error occurred within the API; in all cases contact sshtools.com support with the details of this error and the state of the connection when receiving this exception is unknown.

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Constant Field Values

CHANNEL_FAILURE

public static final int CHANNEL_FAILURE

Indicates that a channel has failed; this is used by channel implementations (such as port forwarding or session channels) to indicate that the channel has critically failed. Upon receiving this exception you should check the connection state to determine whether its still possible to use the connection.

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Constant Field Values

UNSUPPORTED_ALGORITHM

public static final int UNSUPPORTED_ALGORITHM

In setting up a context an algorithm was specified that is not supported by the API.

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Constant Field Values

CANCELLED_CONNECTION

public static final int CANCELLED_CONNECTION

The user cancelled the connection.

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Constant Field Values

KEY_EXCHANGE_FAILED

public static final int KEY_EXCHANGE_FAILED

The protocol failed to negotiate a transport algorithm or failed to verify the host key of the remote host.

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Constant Field Values

CONNECT_FAILED

public static final int CONNECT_FAILED

The connection could not be established.

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Constant Field Values

LICENSE_ERROR

public static final int LICENSE_ERROR

The API is not licensed!

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Constant Field Values

CONNECTION_CLOSED

public static final int CONNECTION_CLOSED

An attempt has been made to use a connection that has been closed and is no longer valid.

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Constant Field Values

AGENT_ERROR

public static final int AGENT_ERROR

An error has occurred within the agent.

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Constant Field Values

FORWARDING_ERROR

public static final int FORWARDING_ERROR

An error has occurred the port forwarding system.

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Constant Field Values

PSEUDO_TTY_ERROR

public static final int PSEUDO_TTY_ERROR

A request was made to allocate a pseudo terminal, but this request failed.

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Constant Field Values

SHELL_ERROR

public static final int SHELL_ERROR

A request was made to start a shell, but this request failed.

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Constant Field Values

SESSION_STREAM_ERROR

public static final int SESSION_STREAM_ERROR

An error occurred whilst accessing a sessions streams

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Constant Field Values

JCE_ERROR

public static final int JCE_ERROR

An error occurred in the JCE; typically this would result from Maverick attempting to use an algorithm that the JCE does not support.

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Constant Field Values

POSSIBLE_CORRUPT_FILE

public static final int POSSIBLE_CORRUPT_FILE

An error occurred reading the contents of a file. Its possible that the file is not correctly formatted.

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Constant Field Values

SCP_TRANSFER_CANCELLED

public static final int SCP_TRANSFER_CANCELLED

The user cancelled an active SCP transfer.

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Constant Field Values

SOCKET_TIMEOUT

public static final int SOCKET_TIMEOUT

The API detected a socket timeout

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Constant Field Values

PROMPT_TIMEOUT

public static final int PROMPT_TIMEOUT

The Shell class failed to detect the prompt.

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Constant Field Values

MESSAGE_TIMEOUT

public static final int MESSAGE_TIMEOUT

An expected message was not received before the specified timeout period.

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Constant Field Values

Constructor Detail

SshException

public SshException(String msg,
            int reason)

Create an exception with the given description and reason.

Parameters:

msg -

reason -

SshException

public SshException(int reason,
            Throwable cause)

Create an exception with the given cause and reason.

Parameters:

reason -

cause -

SshException

public SshException(Throwable cause,
            int reason)

SshException

public SshException(String msg,
            Throwable cause)

Create an exception with the given description and cause. The reason given will be INTERNAL_ERROR.

Parameters:

msg -

cause -

SshException

public SshException(Throwable cause)

Create an exception by providing the cause of the error. This constructor sets the reason to INTERNAL_ERROR.

Parameters:

cause -

SshException

public SshException(String msg,
            int reason,
            Throwable cause)

Create an exception with the given description cause, reason.

Parameters:

msg -

reason -

cause -

Method Detail

getReason

public int getReason()

Get the reason for the exception

Returns:

int

getCause

public Throwable getCause()

If an INTERNAL_ERROR reason is given this method MAY return the cause of the error.

Overrides:

getCause in class Throwable

Returns:

Throwable