是这样一堆乱码:
Error 500--Internal Server Error
java.lang.NullPointerException
at com.mysql.jdbc.PreparedStatement.setString(ILjava.lang.String

V(PreparedStatement.java:2936)
at com.mysql.jdbc.PreparedStatement.setObject(ILjava.lang.Object

V(PreparedStatement.java:2474)
at weblogic.jdbc.wrapper.PreparedStatement.setObject(ILjava.lang.Object

V(PreparedStatement.java:268)
at org.springframework.jdbc.core.StatementCreatorUtils.setParameterValue(Ljava.sql.PreparedStatement;IILjava.lang.String;Ljava.lang.Object;)V(StatementCreatorUtils.java:169)
at org.springframework.jdbc.core.JdbcTemplate$ArgPreparedStatementSetter.setValues(Ljava.sql.PreparedStatement;)V(JdbcTemplate.java:1039)
at org.springframework.jdbc.core.JdbcTemplate$1.doInPreparedStatement(Ljava.sql.PreparedStatement;)Ljava.lang.Object;(JdbcTemplate.java:502)
at org.springframework.jdbc.core.JdbcTemplate.execute(Lorg.springframework.jdbc.core.PreparedStatementCreator;Lorg.springframework.jdbc.core.PreparedStatementCallback;)Ljava.lang.Object;(JdbcTemplate.java:450)
at org.springframework.jdbc.core.JdbcTemplate.query(Lorg.springframework.jdbc.core.PreparedStatementCreator;Lorg.springframework.jdbc.core.PreparedStatementSetter;Lorg.springframework.jdbc.core.ResultSetExtractor;)Ljava.lang.Object;(JdbcTemplate.java:491)
at org.springframework.jdbc.core.JdbcTemplate.query(Ljava.lang.String;Lorg.springframework.jdbc.core.PreparedStatementSetter;Lorg.springframework.jdbc.core.ResultSetExtractor;)Ljava.lang.Object;(JdbcTemplate.java:530)
at org.springframework.jdbc.core.JdbcTemplate.query(Ljava.lang.String;Lorg.springframework.jdbc.core.PreparedStatementSetter;Lorg.springframework.jdbc.core.RowCallbackHandler;)Ljava.util.List;(JdbcTemplate.java:548)
at org.springframework.jdbc.core.JdbcTemplate.query(Ljava.lang.String;[Ljava.lang.Object;Lorg.springframework.jdbc.core.RowCallbackHandler;)Ljava.util.List;(JdbcTemplate.java:558)
at org.springframework.jdbc.core.JdbcTemplate.query(Ljava.lang.String;[Ljava.lang.Object;Lorg.springframework.jdbc.core.RowMapper;)Ljava.util.List;(JdbcTemplate.java:578)
at org.springframework.jdbc.core.JdbcTemplate.queryForList(Ljava.lang.String;[Ljava.lang.Object;)Ljava.util.List;(JdbcTemplate.java:643)
at com.makingstoragesimple.dao.jdbc.DiscuzJdbcDao.isUserNameExisted(Ljava.lang.String;)Z(DiscuzJdbcDao.java:38)
at com.makingstoragesimple.service.MakingStorageSimpleImpl.isUserNameExisted(Ljava.lang.String;)Z(MakingStorageSimpleImpl.java:172)
at com.makingstoragesimple.web.validator.RegisterValidator.validate(Ljava.lang.Object;Lorg.springframework.validation.Errors;)V(RegisterValidator.java:25)
at com.makingstoragesimple.web.RegisterFormController.validatePage(Ljava.lang.Object;Lorg.springframework.validation.Errors;IZ)V(RegisterFormController.java:84)
at org.springframework.web.servlet.mvc.AbstractWizardFormController.processFormSubmission(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;Ljava.lang.Object;Lorg.springframework.validation.BindException;)Lorg.springframework.web.servlet.ModelAndView;(AbstractWizardFormController.java:486)
at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)Lorg.springframework.web.servlet.ModelAndView;(AbstractFormController.java:243)
at org.springframework.web.servlet.mvc.AbstractController.handleRequest(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)Lorg.springframework.web.servlet.ModelAndView;(AbstractController.java:128)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;Ljava.lang.Object;)Lorg.springframework.web.servlet.ModelAndView;(SimpleControllerHandlerAdapter.java:44)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(DispatcherServlet.java:684)
at org.springframework.web.servlet.DispatcherServlet.doService(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(DispatcherServlet.java:625)
at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(FrameworkServlet.java:386)
at org.springframework.web.servlet.FrameworkServlet.doPost(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(FrameworkServlet.java:355)
at javax.servlet.http.HttpServlet.service(Ljavax.servlet.http.HttpServletRequest;Ljavax.servlet.http.HttpServletResponse;)V(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;)V(Optimized Method)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava.lang.Object;(Optimized Method)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Lweblogic.servlet.internal.FilterChainImpl;)V(Optimized Method)
at weblogic.servlet.internal.TailFilter.doFilter(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Ljavax.servlet.FilterChain;)V(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;)V(FilterChainImpl.java:27)
at com.dostor.util.SetCharacterEncodingFilter.doFilter(Ljavax.servlet.ServletRequest;Ljavax.servlet.ServletResponse;Ljavax.servlet.FilterChain;)V(SetCharacterEncodingFilter.java:32)