Hibernate和MySQL超过了锁定等待超时（使用播放框架）

Question

In my web application I'm using Stateless sessions with Hibernate to have better performances on my inserts and updates .

It was working fine with H2 database (the one used in play framework in dev mode).

But when I test it with MySQL I get the following exception :

ERROR ~ Lock wait timeout exceeded; try restarting transaction
ERROR ~ HHH000315: Exception executing batch [Lock wait timeout exceeded; try restarting transaction]

Here is the code :

public static void update() {
    Session session = (Session) JPA.em().getDelegate();
    StatelessSession stateless = this.session.getSessionFactory().openStatelessSession();

        try {

            stateless.beginTransaction();

            // Fetch all products
            {
                List<ProductType> list = ProductType.retrieveAllWithHistory();
                for (ProductType pt : list) {
                    updatePrice(pt, stateless);
                }
            }

            // Fetch all raw materials
            {
                List<RawMaterialType> list = RawMaterialType.retrieveAllWithHistory();
                for (RawMaterialType rm : list) {
                    updatePrice(rm, stateless);
                }
            }
        } catch (Exception ex) {
            play.Logger.error(ex.getMessage());
            ExceptionLog.log(ex, Thread.currentThread());
        } finally {
            stateless.getTransaction().commit();
            stateless.close();
        }
}

private static void updatePrice(ProductType pt, StatelessSession stateless) {
    pt.priceDelta = computeDelta();
    pt.unitPrice = computePrice();

    stateless.update(pt);

    PriceHistory ph = new PriceHistory(pt, price);

    stateless.insert(ph);
}

private static void updatePrice(RawMaterialType rm, StatelessSession stateless) {
    rm.priceDelta = computeDelta();
    rm.unitPrice = computePrice();

    stateless.update(rm);

    PriceHistory ph = new GoodPriceHistory(rm, price);

    stateless.insert(ph);
}

In this example I have 3 simple Entities ( ProductType , RawMaterialType and PriceHistory ). computeDelta and computePrice are just algorithm functions with no DB stuff. retrieveAllWithHistory functions are functions that fetch some data from the database using Play framework model functions.

So, this code retrieves some data, edit some, create new one and finally save everything.

Why have I a lock exception with MySQL and no exception with H2 ?

Answer 1

I'm not sure why you have a commit in a finally block. Give this structure a try:

try {
    factory.getCurrentSession().beginTransaction();
    factory.getCurrentSession().getTransaction().commit();
} catch (RuntimeException e) {
    factory.getCurrentSession().getTransaction().rollback();
    throw e; // or display error message
}

Also, it might be helpful for you to check this documentation .