楼主，你去找找绑定变量的资料来看吧！ 这个才是治本之道！ ORA-04031: unable to allocate string bytes of shared memory ("string","string","string","string") Cause: More shared memory is needed than was allocated in the shared pool.Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and "shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size"
2.定期重整shared pool 空间，使用下面的语句
alter system flush shared_pool;
但是你的应用是java1.4+tomcat5.0，所以不能光考虑oracle一方的问题
要看看java1.4+tomcat5.0对数据库的连接是否及时断开，SQL语句时候合理，内存是否及时释放
虽然JAVA说内存会及时释放的，俺看不一定。。
这个才是治本之道！
ORA-04031: unable to allocate string bytes of shared memory ("string","string","string","string")
Cause: More shared memory is needed than was allocated in the shared pool.Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and "shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size"