J2EE揭示ORA-00933: SQL 命令未正确结束 请大家都来看看代码很简单.

J2EE提示ORA-00933: SQL 命令未正确结束 请大家都来看看代码很简单...
                        

ConnUtil connUtil = new ConnUtil();

			Connection conn= connUtil.getConnection();

			PreparedStatement state=conn.prepareStatement("UPDATE STUDENTS SET name=?,username=?,password=? WHERE studentnumber=?;" );

			state.setString(1, stuupdata.name);

			state.setString(2, stuupdata.username);

			state.setString(3, stuupdata.password);

			state.setInt(4, stuupdata.studentnumber);

			state.executeUpdate();

老是提示ORA-00933: SQL 命令未正确结束    stuupdata是个参数类，里面参数肯定没问题，求大神指导！！！
ORA-00933: SQL 命令未正确结束

at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58)
at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:943)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1075)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3897)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1361)
at cn.com.njust.web.admin.StuUpdata.updata(StuUpdata.java:55)
at org.apache.jsp.jsp.stuupdatasuccess_jsp._jspService(stuupdatasuccess_jsp.java:87)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:388)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)