Class UnavailableException Method & Constructor


Package javax.servlet

Defines an exception that a servlet or filter throws to indicate that it is permanently or temporarily unavailable.
When a servlet or filter is permanently unavailable, something is wrong with it, and it cannot handle requests until some action is taken. For example, a servlet might be configured incorrectly, or a filter's state may be corrupted. The component should log both the error and the corrective action that is needed.

Class UnavailableException Method Detail

isPermanent


public boolean isPermanent()

Returns a boolean indicating whether the servlet is permanently unavailable.
If so, something is wrong with the servlet, and the system administrator must take some corrective action.

Returns

True if the servlet is permanently unavailable; false if the servlet is available or temporarily unavailable

getServlet


public Servlet getServlet()

Deprecated. As of Java Servlet API 2.2, with no replacement. Returns the servlet that is reporting its unavailability.

Returns

the Servlet object that is throwing the UnavailableException


getUnavailableSeconds


public int getUnavailableSeconds()

Returns the number of seconds the servlet expects to be temporarily unavailable. If this method returns a negative number, the servlet is permanently unavailable or cannot provide an estimate of how long it will be unavailable.
No effort is made to correct for the time elapsed since the exception was first reported.

Returns

An integer specifying the number of seconds the servlet will be temporarily unavailable, or a negative number if the servlet is permanently unavailable or cannot make an estimate

Class UnavailableException Constructor Detail

UnavailableException

public UnavailableException(Servlet servlet,
java.lang.String msg)

Deprecated. As of Java Servlet API 2.2, use UnavailableException(String) instead.

Parameters

servlet - the Servlet instance that is unavailable
msg - a String specifying the descriptive message

UnavailableException

public UnavailableException(int seconds,
Servlet servlet,
java.lang.String msg)

Deprecated. As of Java Servlet API 2.2, use UnavailableException(String, int) instead.

Parameters

seconds - an integer specifying the number of seconds the servlet expects to be unavailable; if zero or negative, indicates that the servlet can't make an estimate
servlet - the Servlet that is unavailable
msg - a String specifying the descriptive message, which can be written to a log file or displayed for the user.

UnavailableException


public UnavailableException(java.lang.String msg)

Constructs a new exception with a descriptive message indicating that the servlet is permanently unavailable.

Parameters


msg - a String specifying the descriptive message

UnavailableException

public UnavailableException(java.lang.String msg,
int seconds)

Constructs a new exception with a descriptive message indicating that the servlet is temporarily unavailable and giving an estimate of how long it will be unavailable.

In some cases, the servlet cannot make an estimate. For example, the servlet might know that a server it needs is not running, but not be able to report how long it will take to be restored to functionality. This can be indicated with a negative or zero value for the seconds argument.

Parameters

msg - a String specifying the descriptive message, which can be written to a log file or displayed for the user.
seconds - an integer specifying the number of seconds the servlet expects to be unavailable; if zero or negative, indicates that the servlet can't make an estimate

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