BootstrapServiceRegistry bootstrapServiceRegistry = new BootstrapServiceRegistryBuilder()
// pass in org.hibernate.integrator.spi.Integrator instances which are not
// auto-discovered (for whatever reason) but which should be included
.with( anExplicitIntegrator )
// pass in a class-loader Hibernate should use to load application classes
.withApplicationClassLoader( anExplicitClassLoaderForApplicationClasses )
// pass in a class-loader Hibernate should use to load resources
.withResourceClassLoader( anExplicitClassLoaderForResources )
// see BootstrapServiceRegistryBuilder for rest of available methods
...
// finally, build the bootstrap registry with all the above options
.build();