Question

I feel puzzle …

I write a small routine in .jsp. Finally, ResultSet, Statement and Connection are required to be closed. I also write the closing codes in finally { }, but when the page is run, it return error that I didn’t catch exception …

I read some forum. Other people didn’t catch any exception in finally { }

Any Hint ?

Answer 1

It helps if you say what is in your try block. You are probably not catching appropriate exception or your code in finally throws exception.

It is OK to have finally without catch.

try {
 //do some work
}  

finally {
 //check of state and do clean up. You would have reached here via multiple branches. 
}

It more appropriate to catch specific exceptions using catch and then handle specific cleanup there. Use finally for any code that must get executed even when exception happen.

try {
   //do some work
}  
catch ( RecoverableException1 re1) {
   //cleanup
}
catch ( RecoverableException2 re2) {
   //cleanup
}

finally {
   //check of state and do clean up. You would have reached here via multiple branches.
}