java.lang.NullPointerException в запросе SQL

У меня есть SQL-запрос, который вставляет данные в строку Oracle. Я получаю NPE, когда запускаю оператор.

public int saveData(int result) throws SQLException, java.text.ParseException, NoSuchAlgorithmException {

    String SqlStatement = null;

    if (ds == null) {
        throw new SQLException();
    }

    Connection conn = ds.getConnection();
    if (conn == null) {
        throw new SQLException();
    }

    PreparedStatement ps = null;

    /*

    CREATE TABLE USERS(
        USERID INTEGER NOT NULL,
        GROUPID INTEGER,
        SPECIALNUMBER VARCHAR2(60 ),
        USERNAME VARCHAR2(50 ),
        PASSWD VARCHAR2(50 ),
        DATETOCHANGEPASSWD DATE,
        ADDRESS VARCHAR2(60 ),
        STATEREGION VARCHAR2(50 ),
        COUNTRY VARCHAR2(50 ),
        USERSTATUS VARCHAR2(30 ),
        TELEPHONE VARCHAR2(50 ),
        DATEUSERADDED DATE,
        USEREXPIREDATE DATE,
        DATEUSERLOCKED CHAR(20 ),
        CITY VARCHAR2(50 ),
        EMAIL VARCHAR2(50 ),
        DESCRIPTION CLOB
    )
   */

    try {
        conn.setAutoCommit(false);
        boolean committed = false;
        try {           
            String getTimeStampTemplateSQL = "(select (select settingvalue from globalsettings where settingname = 'DateFormat') || ' ' ||"
                                             + "(select settingvalue from globalsettings where settingname = 'TimeFormat') from dual)";

            /* insert into Oracle the default system(Linux) time */
            SqlStatement = "INSERT INTO USERS VALUES (?, ?, ?, ?, ?, to_timestamp(?, " 
                    + getTimeStampTemplateSQL + "), ?, ?, ?, ?, ?, SYSTIMESTAMP, to_timestamp(?, " + getTimeStampTemplateSQL +
                    "), ?, ?, ?, ?)";

            ps = conn.prepareStatement(SqlStatement);

            ps.setString(1, formMap.get("USERID"));
            ps.setString(2, formMap.get("GROUPID"));
            ps.setString(3, formMap.get("SPECIALNUMBER"));
            ps.setString(4, formMap.get("USERNAME"));
            ps.setString(5, passwdConvert(formMap.get("PASSWD")));
            ps.setString(6, formMap.get("DATETOCHANGEPASSWD").trim().length() == 0 ? null : formMap.get("DATETOCHANGEPASSWD").trim() + " " + formMap.get("HOURTOCHANGEPASSWD").trim());
            ps.setString(7, formMap.get("ADDRESS"));
            ps.setString(8, formMap.get("STATEREGION"));
            ps.setString(9, formMap.get("COUNTRY"));
            ps.setString(10, formMap.get("USERSTATUS"));

            // If the user set Account Status to Blocked insert SYSTIMESTAMP into DATEUSERLOCKED
            if ((formMap.get("USERSTATUS")!=null) && (formMap.get("USERSTATUS")).equals("Blocked")){
                formMap.put("DATEUSERLOCKED", "SYSTIMESTAMP");
            }               

            ps.setString(11, formMap.get("TELEPHONE"));
            ps.setString(12, formMap.get("USEREXPIREDATE").trim().length() == 0 ? null : formMap.get("USEREXPIREDATE").trim() + " " + formMap.get("USEREXPIREHOUR").trim());

            //ps.setString(13, formMap.get("DATEUSERLOCKED").trim().length() == 0 ? null : formMap.get("DATEUSERLOCKED"));

            ps.setString(13, ((formMap.get("DATEUSERLOCKED")==null) || ((formMap.get("DATEUSERLOCKED")!=null) && (formMap.get("DATEUSERLOCKED").trim().length()==0)))? null : formMap.get("DATEUSERLOCKED"));

            ps.setString(14, formMap.get("CITY"));
            ps.setString(15, formMap.get("EMAIL"));
            ps.setString(16, formMap.get("DESCRIPTION"));


            ps.executeUpdate();

            conn.commit();
            committed = true;
        }
        finally 
        {
            if (!committed) {
                conn.rollback();
            }
        }
    } finally {
        /* Release the resources */
        ps.close();
        conn.close();
    }
    // For JGrown message
    FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage("Successful", "User " + formMap.get("USERID") + " is created!"));

    return result;
}

Я получаю эту ошибку:

javax.faces.FacesException: #{AddAccountController.saveData(1)}: java.sql.SQLDataException: ORA-01858: a non-numeric character was found where a numeric was expected

    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:118)
    at javax.faces.component.UICommand.broadcast(UICommand.java:315)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: javax.faces.el.EvaluationException: java.sql.SQLDataException: ORA-01858: a non-numeric character was found where a numeric was expected

    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
   ... 31 more
Caused by: java.sql.SQLDataException: ORA-01858: a non-numeric character was found where a numeric was expected

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:445)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:879)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:450)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:1044)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1329)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584)
    at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3665)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1352)
    at com.sun.gjc.spi.base.PreparedStatementWrapper.executeUpdate(PreparedStatementWrapper.java:125)
    at com.DX_57.AC_57.AddAccount.saveData(AddAccount.java:207)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at javax.el.BeanELResolver.invokeMethod(BeanELResolver.java:779)
    at javax.el.BeanELResolver.invoke(BeanELResolver.java:528)
    at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:257)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:248)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
   ... 32 more
|#]

Не могли бы вы помочь мне решить проблему? Может быть, порядок подготовленных утверждений неверен?

P.S проблема здесь:

ps.setString(13, formMap.get("DATEUSERLOCKED").trim().length() == 0 ? null : formMap.get("DATEUSERLOCKED"));