pg_restore in java connection (auto_commit = false)

Good afternoon,

I have a question about pg_restore in JAVA and need your help.

I planed to do:
==================
1. pg_dump each tables (done successfully)
2. start a java connection
auto_commit = false

3.for(Table1... ... TableN)
{
drop primary key

pg_restore table (dead lock here)

add primary key

Connection.commit
}

It seems that the above steps caused a lock for the tableX. Could
someone give me some ideas please?

Thanks a lot!