From openindiana at out-side.nl  Thu Oct  4 09:16:43 2018
From: openindiana at out-side.nl (the outsider)
Date: Thu, 4 Oct 2018 15:16:43 +0200
Subject: [undertow-dev] Undertow.js and failed MySQL queries keep connection
	occupied?
Message-ID: <01c501d45be4$7ec5cb70$7c516250$@out-side.nl>

We try to use undertow.js for database interactions and this works well as
long as the queries do not fail. 

But in case something breaks, the JDBC connection seems to stall in wildfly
and can not be closed in any matter. 

(There isn't even a connection.close() statement available in undertow.js ?
)

Function demo() {

var db = $undertow.resolve("config");

try{

                        var query                      = "select ID as maxID
from null"; // this will fail for sure

                        var dbresult                   =
db.selectOne(query);

                        // now undertow.js will jump to the catch() block

                        result.db                       = dbresult['maxID'];

                        return result; 

            }catch(ex){

                        print(ex.toString());

}

}

 

Every time we call the above function the JDBC driver will make a new
connection to the database and the old ones will remain connected and will
never be cleared. 

This continues until the Max Pool Size:  is reached. 

 

Systems tested: Wildfly 10 /11 on Windows and Linux

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