If you’re using MSSQL Server and wondering about this error message produced by Hibernate:

Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: Cannot insert explicit value for identity column in table '<TABELNAME>' when IDENTITY_INSERT is set to OFF.

you’re annotated classes are maybe missing the @GeneratedValue annotation for the Identifier. Something like this:

@Id 
    @Column(name="MY_ID", unique=true, nullable=false)
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    public int getMyId() {
        return this.myId;
    }