I tried now a couple of different scenarios where I defined two tables (with a 1:n) relationship) in a MySQL database and used Hibernate Tools to generate corresponding, annotated java classes from them.

I found NO way to let Hibernate Tools generate the desired

@OneToMany(....)

or

@ManyToOne(....)

annotations. Assume for example the simplified table DDL below.
Why is there no @OneToMany generated in class for TAB1?
In other words: What do I have to change in the DDL to have Hibernate Tools
generate such a @OneToMany (and @ManyToOne) ?

CREATE TABLE TAB1 (
ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
OTHERFIELD VARCHAR(20) NULL;
PRIMARY KEY(ID),
INDEX TAB1_FKIndex1(ID)
);

CREATE TABLE TAB2 (
ID INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
DUMMYFIELD DATE NULL,
REFTOTAB1 INTEGER UNSIGNED NULL,
PRIMARY KEY(ID),
INDEX TAB2_FKIndex1(ID),
INDEX TAB2_FKIndex2(REFTOTAB1)
);

there are no defined connections between the two tables you list.

define a foreign key.