Java Servlet initialization fail

Question

If we are using a resource in servlet init method and during initialization it failed to reach that resource but we know that after sometime resource will be available. What shall we do in this case?

throw unavailable exception
don't do anything once a request comes for this servlet it might start working
do necessary stuff like try/catch and provide fallback logic

Any other suggestion?

Vidya · Accepted Answer · 2014-01-26 06:04:59Z

1

It's a strange situation to accept requests before everything is available, but regardless, this is an example of a fault exception. You should throw an exception and have it bubble up to the "fault barrier," which is where you handle the exception. For example, you might log the exception and let the user know to check back later.

This is in contrast to contingency exceptions, which are recoverable and should be handled in such a way as to allow the user to move forward.

By the way, I didn't come up with this approach. Barry Ruzek did.

answered Jan 26, 2014 at 6:04

Vidya

30.4k7 gold badges48 silver badges73 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

jiangchunzhi · Accepted Answer · 2014-01-26 06:10:28Z

1

I think, it depend on whether the resource is required for user's request. If it is required, you must initialize the resource before process user's request. If it is not required, you can skip the resource. You can also log the request in your database or log file. When the resource is available, you can invoke operation according to the log and modify status of the data which you stored.

answered Jan 26, 2014 at 6:10

jiangchunzhi

814 bronze badges

4 Comments

user3085390 Over a year ago

then how do you handle in-case resource failed to initialize?

jiangchunzhi Over a year ago

it depend on whether the resource is required for user's request. If it is required, you can throws exception. If it is not required, you can catch the exception and output it in log file. You can also set an flag in your code and set it false when resource failed to initialized. The latter request will judge the flag. If it is false, it will skip the code.

user3085390 Over a year ago

if i understand correctly, you mean throwing unavailable exception is enough. no need to provide fallback logic in-case resource is required and not available?

jiangchunzhi Over a year ago

I mean that if you bussiness logic must depend on the resource, you can throw exception when the resource is required and not available. Otherwise you can skip the resource when the it not required.

Collectives™ on Stack Overflow

Java Servlet initialization fail

2 Answers 2

Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related