我设法通过使用CriteriaBuilder.treat（）将BaseEntity根向下转换为与子类类型相对应的新根来解决此问题，如下所示：
CriteriaBuilder builder = ...;
CriteriaQuery<BaseEntity> query = ...;
Root<BaseEntity> root = ...;
Root<Entity1> entity1 = builder.treat(root, Entity1.class);
Root<Entity2> entity2 = builder.treat(root, Entity2.class);
query.select(root).where(builder.and(
builder.lessThan(root.get(BaseEntity_.someDate), new Date()),
builder.greaterThan(root.get(BaseEntity_.otherDate), new Date()),
builder.isTrue(root.get(BaseEntity_.flag)),
builder.equal(entity1.get(Entity1_.someProperty), "foo"),
builder.equal(entity2.get(Entity2_.otherProperty), "bar")
));
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