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java.lang.Object java.lang.Throwable java.lang.Exception javax.servlet.ServletException javax.servlet.UnavailableException
public class UnavailableException
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.
A servlet or filter is temporarily unavailable if it cannot handle requests momentarily due to some system-wide problem. For example, a third-tier server might not be accessible, or there may be insufficient memory or disk storage to handle requests. A system administrator may need to take corrective action.
Servlet containers can safely treat both types of unavailable exceptions in the same way. However, treating temporary unavailability effectively makes the servlet container more robust. Specifically, the servlet container might block requests to the servlet or filter for a period of time suggested by the exception, rather than rejecting them until the servlet container restarts.
Constructor Summary | |
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UnavailableException(int seconds,
Servlet servlet,
String msg)
Deprecated. As of Java Servlet API 2.2, use UnavailableException(String, int) instead. |
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UnavailableException(Servlet servlet,
String msg)
Deprecated. As of Java Servlet API 2.2, use UnavailableException(String) instead. |
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UnavailableException(String msg)
Constructs a new exception with a descriptive message indicating that the servlet is permanently unavailable. |
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UnavailableException(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. |
Method Summary | |
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Servlet |
getServlet()
Deprecated. As of Java Servlet API 2.2, with no replacement. Returns the servlet that is reporting its unavailability. |
int |
getUnavailableSeconds()
Returns the number of seconds the servlet expects to be temporarily unavailable. |
boolean |
isPermanent()
Returns a boolean indicating
whether the servlet is permanently unavailable. |
Methods inherited from class javax.servlet.ServletException |
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getRootCause |
Methods inherited from class java.lang.Throwable |
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fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public UnavailableException(Servlet servlet, String msg)
UnavailableException(String)
instead.
servlet
- the Servlet
instance that is unavailablemsg
- a String
specifying the descriptive messagepublic UnavailableException(int seconds, Servlet servlet, String msg)
UnavailableException(String, int)
instead.
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 estimateservlet
- the Servlet
that is unavailablemsg
- a String
specifying the descriptive
message, which can be written to a log file or displayed for
the user.public UnavailableException(String msg)
msg
- a String
specifying the descriptive messagepublic UnavailableException(String msg, int seconds)
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.
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 estimateMethod Detail |
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public boolean isPermanent()
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.
true
if the servlet is
permanently unavailable; false
if the servlet is available or temporarily unavailablepublic Servlet getServlet()
Servlet
object that is
throwing the UnavailableException
public int getUnavailableSeconds()
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.
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