两条insert语句引起的死锁问题，求解。

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两条insert语句引起的死锁问题，求解。5

使用java编写的批量插入程序，在进行并发测试时出现了数据死锁的问题，查看udump日志信息如下:
*** SESSION ID:(132.130) 2012-06-25 13:39:09.656
DEADLOCK DETECTED ( ORA-00060 )
[Transaction Deadlock]
The following deadlock is not an ORACLE error. It is a
deadlock due to user error in the design of an application
or from issuing incorrect ad-hoc SQL. The following
information may aid in determining the deadlock:
Deadlock graph:
                       ---------Blocker(s)-------- ---------Waiter(s)---------
Resource Name          process session holds waits process session holds waits
TX-00020010-000040de        32     132     X             42     135           S
TX-00060002-00003f89        42     135     X             32     132           S
session 132: DID 0001-0020-00000018 session 135: DID 0001-002A-00000009
session 135: DID 0001-002A-00000009 session 132: DID 0001-0020-00000018
Rows waited on:
Session 135: obj - rowid = 0000F78A - AAAPeKAAAAAAAAAAAA
(dictionary objn - 63370, file - 0, block - 0, slot - 0)
Session 132: obj - rowid = 0000F78A - AAAPeKAAGAAAl3OAAA
(dictionary objn - 63370, file - 6, block - 155086, slot - 0)
Information on the OTHER waiting sessions:
Session 135:
pid=42 serial=591 audsid=230181 user: 72/SHZY2
O/S info: user: , term: , ospid: 1234, machine: csbyyserver
            program:
Current SQL Statement:
insert into t_idx_zxcx (zj,ztlx,glxxbh,hm) values ('6404618','01','238','350212198502090000')
End of information on OTHER waiting sessions.
Current SQL statement for this session:
insert into t_idx_zxcx (zj,ztlx,glxxbh,hm) values ('6403618','01','238','350212198502090000')
===================================================

两个不同的会话在插入的时候，rowid居然一致。一直想不通问题的原因，只能求大牛帮忙了。附上数据库表的设计：
附件1为数据库表设计，附件2为该表的索引，附件3为表的主键设计