[From the forum|https://forum.hibernate.org/viewtopic.php?f=31&t=1036796]:
"if
{quote}
If I use the new ID-feature with MongoDB (ObjectId) like this
Code :
{ quote}
{ code}
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private ObjectId id;
@Embedded
private SomeEmbeddable details;
{code}
a {quote}
Then storing of the entity causes the following exception:
{quote}
Code:
{code}
java.lang.IllegalArgumentException: Document field names can't have a . in them. (Bad Key: 'details.endDate')
{code} '"
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