求解Oracle JDBC中invalid character问题

String s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12;
s1=jtf1.getText();
s2=jtf2.getText();
s3=jtf3.getText();
s4=jtf4.getText();
s5=jtf5.getText();
s6=jtf6.getText();
s7=jtf7.getText();
s8=jtf8.getText();
s9=jtf9.getText();
s10=jtf10.getText();
s11=jtf11.getText();
s12=jta.getText();
                 String sql="insert into t_bus values(seq_bus.nextval,?,?,?,?,?,?,?,?,?,?,?,?,null,2);";
SQLHelp sqlHelp=new SQLHelp();
sqlHelp.executeUpdate(sql, new Object[]{s1,s2,s3,s4,s5,s6,s7,s8,s9,s10,s11,s12});
SQL语句出错
java.sql.SQLException: ORA-00911: invalid character
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:124)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:304)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:271)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:622)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:180)
at oracle.jdbc.driver.T4CPreparedStatement.execute_for_rows(T4CPreparedStatement.java:542)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1027)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:2887)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:2959)
at CONTROL.SQLHelp.executeUpdate(SQLHelp.java:59)
at CONTROL.AddLineCTR.actionPerformed(AddLineCTR.java:43)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6134)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5899)
at java.awt.Container.processEvent(Container.java:2023)
at java.awt.Component.dispatchEventImpl(Component.java:4501)
at java.awt.Container.dispatchEventImpl(Container.java:2081)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4301)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3965)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3895)
at java.awt.Container.dispatchEventImpl(Container.java:2067)
at java.awt.Window.dispatchEventImpl(Window.java:2458)
at java.awt.Component.dispatchEvent(Component.java:4331)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)