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From "Pablo (JIRA)" <>
Subject [jira] [Created] (POOL-361) setTestOnCreate does not test on create
Date Fri, 08 Mar 2019 21:56:00 GMT
Pablo created POOL-361:

             Summary: setTestOnCreate does not test on create
                 Key: POOL-361
             Project: Commons Pool
          Issue Type: Bug
    Affects Versions: 2.6.1
            Reporter: Pablo

When setting testOnCreate to true, I would expect for the validation to take place when an
object is created, but apparently it does not.

It only seems to be tested on borrow and when idle.

This has a negative impact, because when new objects get created, since they are not tested
they appear in the pool as idle.

I'm trying to determine if the pool's health, but even though the pool reports idle objects
they are botched instances.

Also related to this issue, objects aren't actually created upfront. They seem to be created
on first borrow or when timeBetweenEvictionRunMillis elapses.

Environment (unimportant I think): 1.8.0_191, Ubuntu 18.04

Test case:

 public static void main(String[] args) throws Exception {
        PooledObjectFactory<String> factory = new BasePooledObjectFactory<String>()
            public String create() throws Exception {
                String s = "Hello";
                System.out.println("Creating " + s);
                return s;

            public void destroyObject(PooledObject<String> p) throws Exception
                System.out.println("Destroying " + p.getObject());

            public boolean validateObject(PooledObject<String> p) {
                System.out.println("Validating " + p.getObject());
                return super.validateObject(p);

            public PooledObject<String> wrap(String obj) {
                return new Wrapper<String>(obj);
        GenericObjectPoolConfig<String> socketPoolConfig = new GenericObjectPoolConfig<String>();
        GenericObjectPool<String> objectPool = new GenericObjectPool<String>(factory,

        System.out.println("Pool created");
        String f1 = objectPool.borrowObject();
        System.out.println("Borrowed" + f1);


Expected result:

{{        Pool created}}
{{        Creating Hello}}
{{        *Validating Hello*}}
{{        Allocating Hello}}
{{        BorrowedHello}}
{{        DeallocatingHello}}
{{        Destroying Hello}}
{{        Done}}


Actual result:

{{        Pool created}}
{{        Creating Hello}}
{{        Allocating Hello}}
{{        *Validating Hello*}}
{{        BorrowedHello}}
{{        DeallocatingHello}}
{{        Destroying Hello}}
{{        Done}}


 Or am I misunderstanding something?





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