Clob的读取

Question

weblogic.jdbc.vendor.oracle.OracleThinClob  clob = (weblogic.jdbc.vendor.oracle.OracleThinClob)    rs.getClob("CONTENTCLOB"); 
Writer outStream =  clob.getCharacterOutputStream(); 
char[] c = wxTopic.getContent().toCharArray(); 
outStream.write(c, 0, c.length); 
outStream.flush(); 
outStream.close(); 
为什在 outStream.flush();这行报错。 
报错信息： 
java.io.IOException: ORA-03113: 通信通道的文件结束 
at oracle.jdbc.dbaccess.DBError.SQLToIOException(DBError.java:717) 
at oracle.jdbc.driver.OracleClobWriter.flushBuffer(OracleClobWriter.java:270) 
at oracle.jdbc.driver.OracleClobWriter.flush(OracleClobWriter.java:204) 
本机测试通过，生产库中就报上述错误。 
本机测试是oracle10G, 生产库是9i. 
oracle驱动 都是ojdbc14. 
搞了半天，头大。请各位帮忙分析下，不甚感激。