Message Title

When the bucket has reached its limit, a new last source value is retrieved from the HiLo table.
The upper limit is then set, but the current value is never set to the new bucket start value.
This means that if there is more than one process using the same HiLo sequence, the HiLo values could start overlapping.

package org.hibernate.id.enhanced;

public class HiLoOptimizer extends AbstractOptimizer {

...
	@Override
	public synchronized Serializable generate(AccessCallback callback) {
		final GenerationState generationState = locateGenerationState( callback.getTenantIdentifier() );

		if ( generationState.lastSourceValue == null ) {
			// first call, so initialize ourselves.  we need to read the database
			// value and set up the 'bucket' boundaries
			generationState.lastSourceValue = callback.getNextValue();
			while ( generationState.lastSourceValue.lt( 1 ) ) {
				generationState.lastSourceValue = callback.getNextValue();
			}
			// upperLimit defines the upper end of the bucket values
			generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment();
			// initialize value to the low end of the bucket
			generationState.value = generationState.upperLimit.copy().subtract( incrementSize );
		}
		else if ( ! generationState.upperLimit.gt( generationState.value ) ) {
			generationState.lastSourceValue = callback.getNextValue();
			generationState.upperLimit = generationState.lastSourceValue.copy().multiplyBy( incrementSize ).increment();