DateLocaleConverter使用时遇到的问题

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// 生日if (this.birthday != null && !this.birthday.trim().equals("")) {//try {System.out.println("生日："+this.birthday);DateLocaleConverter dic = new DateLocaleConverter();dic.convert(this.birthday, "yyyy-MM-dd");//dic.convert(this.birthday, "yyyy-MM-dd");//} catch (Exception e) {//System.out.println("生日："+this.birthday);//isOK = false;//errors.put("birthday", "日期格式不正确");//}}

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这一段代码百试不通，得到的异常是这样

严重: Servlet.service() for servlet [RegisterServlet] in context with path [/day09_user] threw exceptionjava.lang.NullPointerExceptionat java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:494)at org.apache.commons.beanutils.locale.converters.DateLocaleConverter.<init>(DateLocaleConverter.java:88)at org.apache.commons.beanutils.locale.converters.DateLocaleConverter.<init>(DateLocaleConverter.java:140)at org.apache.commons.beanutils.locale.converters.DateLocaleConverter.<init>(DateLocaleConverter.java:115)at org.apache.commons.beanutils.locale.converters.DateLocaleConverter.<init>(DateLocaleConverter.java:102)at cn.itcast.web.formbean.RegisterForm.validate(RegisterForm.java:139)at cn.itcast.web.controller.RegisterServlet.doGet(RegisterServlet.java:28)at cn.itcast.web.controller.RegisterServlet.doPost(RegisterServlet.java:73)at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1008)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)at java.lang.Thread.run(Thread.java:619)

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原因是javabeande common-beanUtils.jar包的版本过时，查阅资料得知使用1.8.3版本可以解决，我去官网使用最新版1.9.2版本解决

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