org.logicalcobwebs.proxool
Class ProxoolException
Exception
org.logicalcobwebs.proxool.ProxoolException
public class ProxoolException
extends Exception
Proxool exception class that emulates the behaviour of the new cause
facility in jdk 1.4. It is also known as the
chained
exception facility, as the cause can, itself, have a cause, and so on,
leading to a "chain" of exceptions, each caused by another.
A cause can be associated with a throwable in two ways: via a
constructor that takes the cause as an argument, or via the
initCause(Throwable)
method. New throwable classes that
wish to allow causes to be associated with them should provide constructors
that take a cause and delegate (perhaps indirectly) to one of the
Throwable constructors that takes a cause.
$Revision: 1.2 $, $Date: 2003/03/03 11:11:58 $- Christian Nedregaard (christian_nedregaard@email.com)
- $Author: billhorsman $ (current maintainer)
ProxoolException() - Constructs a new instance with
null as its detail message.
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ProxoolException(String message) - Constructs a new instance with the specified detail message.
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ProxoolException(String message, Throwable cause) - Constructs a new instance with the specified detail message and cause.
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ProxoolException(Throwable cause) - Constructs a new throwable with the specified cause and a detail
message of (cause==null ? null : cause.toString()) (which
typically contains the class and detail message of cause).
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Throwable | getCause() - Returns the cause of this exception or
null if the
cause is nonexistent or unknown.
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Throwable | initCause(Throwable cause) - Initializes the cause of this exception to the specified value.
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void | printStackTrace() - Prints this ProxoolException and its backtrace to the
standard error stream.
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void | printStackTrace(PrintStream stream) - Prints this ProxoolException and its backtrace to the specified print stream.
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void | printStackTrace(PrintWriter writer) - Prints this ProxoolException and its backtrace to the specified
print writer.
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ProxoolException
public ProxoolException()
Constructs a new instance with
null
as its detail message.
The cause is not initialized, and may subsequently be initialized by a
call to
initCause(Throwable)
.
ProxoolException
public ProxoolException(String message)
Constructs a new instance with the specified detail message. The
cause is not initialized, and may subsequently be initialized by
a call to
initCause(Throwable)
.
message
- the detail message. The detail message is saved for
later retrieval by the getMessage()
method.
ProxoolException
public ProxoolException(String message,
Throwable cause)
Constructs a new instance with the specified detail message and cause.
Note that the detail message associated with
cause
is
not automatically incorporated in
this throwable's detail message.
message
- the detail message (which is saved for later retrieval
by the getMessage()
method).cause
- the cause (which is saved for later retrieval by the
getCause()
method). (A null value is
permitted, and indicates that the cause is nonexistent or
unknown.)
ProxoolException
public ProxoolException(Throwable cause)
Constructs a new throwable with the specified cause and a detail
message of (cause==null ? null : cause.toString()) (which
typically contains the class and detail message of cause).
This constructor is useful for throwables that are little more than
wrappers for other throwables.
cause
- the cause (which is saved for later retrieval by the
getCause()
method). (A null value is
permitted, and indicates that the cause is nonexistent or
unknown.)
getCause
public Throwable getCause()
Returns the cause of this exception or
null
if the
cause is nonexistent or unknown. (The cause is the throwable that
caused this exception to get thrown.)
This implementation returns the cause that was supplied via one of
the constructors requiring a
Throwable, or that was set after
creation with the
initCause(Throwable)
method.
- the cause of this throwable or
null
if the
cause is nonexistent or unknown.
initCause
public Throwable initCause(Throwable cause)
Initializes the
cause of this exception to the specified value.
(The cause is the throwable that caused this exception to get thrown.)
This method can be called at most once. It is generally called from
within the constructor, or immediately after creating the
throwable. If this throwable was created
with
ProxoolException(Throwable)
or
ProxoolException(String,Throwable)
, this method cannot be called
even once.
cause
- the cause (which is saved for later retrieval by the
getCause()
method). (A null value is
permitted, and indicates that the cause is nonexistent or
unknown.)
- a reference to this
ProxoolException
instance.
printStackTrace
public void printStackTrace()
Prints this ProxoolException and its backtrace to the
standard error stream.
The backtrace for a ProxoolException with an initialized, non-null cause
should generally include the backtrace for the cause.
printStackTrace
public void printStackTrace(PrintStream stream)
Prints this ProxoolException and its backtrace to the specified print stream.
stream
- PrintStream
to use for output
printStackTrace
public void printStackTrace(PrintWriter writer)
Prints this ProxoolException and its backtrace to the specified
print writer.
writer
- PrintWriter
to use for output