Hello, I have a problem mapping composite ids. Here's my case:

This is my sample diagram:

Table1
->table1_column1

Table2
->table2_column1
->table2_column2

This is the mapping requirement:

All the columns in Table2 is the composite-id keys
Table2->table2_column1 is mapped to Table1->table_column1
Table2->table2_column2 is also mapped to Table1->table_column1

This is my mapping sample:

for Table1
<class name="Table1" table="Table2">
<id name="table1_column1" column="table1_column1">
<generator class="increment" />
</id>

<set name="table2s" table="Table2" cascade="all">
<key column="table1_column1" />
<one-to-many class="Table2" />
</set>

</class>

for Table2
<class name="Table2" table="Table2">
<composite-id>
<key-many-to-one name="primaryKey" class="Table1" column="table2_column1" />
<key-many-to-one name="secondaryKey" class="Table1" column="table2_column2" />
</composite-id>

<many-to-one name="primaryKey" column="table1_column1"
class="Table1" not-null="true" insert="false" update="false" cascade="all"/>
<many-to-one name="secondaryKey" column="table1_column1"
class="Table1" not-null="true" insert="false" update="false" cascade="all" />
</class>


when I tried to save, using this:

Table1 table1a = new Table1();
Table1 table1b = new Table1();

Table2 table2 = new Table2();
table2.setPrimaryKey(table1a);
table2.setSecondaryKey(table1b);

table1.getTable2s().add(table2);
table2.getTable2s().add(table2);

session.save(table2);

I'm getting this error :
Hibernate: insert into TABLE1 (table1_column1 ) values (?)
Hibernate: insert into TABLE1 (table1_column1 ) values (?)
22:13:03,435 INFO TestDao2:44 - org.hibernate.exception.GenericJDBCException: Could not execute JDBC batch update

could anyone help me on how to correct this? Thanks in advance.