JpaPersistence.java 文件源码

/** {@inheritDoc} */
@Override
public ProviderUtil getProviderUtil() { // we suppose it is loaded later than createXXXEMF so we'll get the delegate
    if (delegate == null) {
        // delegate not yet loaded and perhaps will never be:
        // this method may be called, even without jpa impl to delegate,
        // for example, by hibernate validator via jpa api but without jpa impl
        // (issue 396, if loadOrGuessDelegate(null) was called here),
        // so return a dumb ProviderUtil in this case or if delegate not yet loaded
        return DUMMY_PROVIDER_UTIL;
    }
    return delegate.getProviderUtil();
}