处理XMLfile XStream API时的ConversionException

Question

我在使用OVAL验证框架处理XML文件时收到异常。我正在使用OVAL验证框架进行验证。我遵循这个用户指南在现场记录。 http://oval.sourceforge.net/userguide.html

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is com.thoughtworks.xstream.converters.ConversionException: 
---- Debugging information ---- 
cause-exception  : java.lang.RuntimeException 
cause-message  : null 
class    : java.util.regex.Pattern 
required-type  : java.util.regex.Pattern 
converter-type  : com.thoughtworks.xstream.converters.extended.RegexPatternConverter 
path    : /oval/class/field/matchPattern/pattern 
line number   : 13 
class[1]   : net.sf.oval.constraint.MatchPatternCheck 
converter-type[1] : net.sf.oval.configuration.xml.XMLConfigurer$1 
class[2]   : net.sf.oval.configuration.pojo.elements.FieldConfiguration 
class[3]   : net.sf.oval.configuration.pojo.elements.ClassConfiguration 
class[4]   : net.sf.oval.configuration.pojo.POJOConfigurer 
version    : 1.4.9 
------------------------------- 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:661) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
Root Cause 

com.thoughtworks.xstream.converters.ConversionException: 
---- Debugging information ---- 
cause-exception  : java.lang.RuntimeException 
cause-message  : null 
class    : java.util.regex.Pattern 
required-type  : java.util.regex.Pattern 
converter-type  : com.thoughtworks.xstream.converters.extended.RegexPatternConverter 
path    : /oval/class/field/matchPattern/pattern 
line number   : 13 
class[1]   : net.sf.oval.constraint.MatchPatternCheck 
converter-type[1] : net.sf.oval.configuration.xml.XMLConfigurer$1 
class[2]   : net.sf.oval.configuration.pojo.elements.FieldConfiguration 
class[3]   : net.sf.oval.configuration.pojo.elements.ClassConfiguration 
class[4]   : net.sf.oval.configuration.pojo.POJOConfigurer 
version    : 1.4.9 
------------------------------- 
    com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79) 
    com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:70) 
    com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) 

我的XML是

<?xml version="1.0" ?> 
<oval xmlns="http://oval.sf.net/oval-configuration" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://oval.sf.net/oval-configuration http://oval.sourceforge.net/oval-configuration.xsd"> 
    <!-- define checks for the acme.model.User class --> 
    <!-- overwrite=false means already defined checks for this class will not 
     be removed --> 
    <class type="org.rbac.form.ConfigurationLoginForm" overwrite="false"> 
     <field name="password"> 
      <notNull message="password.can.not.be null"></notNull> 
      <notEmpty message="password.can.not.be.empty"></notEmpty> 
      <length min="4" max="20" message="password.length.must.be.between.min.max"></length> 
      <matchPattern matchAll="true"> 
       <pattern pattern="^[a-z0-9]{8}$" flags="0" /> 
      </matchPattern> 
     </field> 

    </class> 
</oval> 

这是一个验证对象对XML

XMLConfigurer xmlConfigurer = new XMLConfigurer(FormValidator.class.getResourceAsStream("/validation/login_configuration.xml")); 
     Guard guard = new Guard(xmlConfigurer); 
     Validator validator = new Validator(guard.getConfigurers()); 
     ResourceBundleMessageResolver messageResolver = new ResourceBundleMessageResolver(); 
     messageResolver.addMessageBundle(resourceBundle); 
     Validator.setMessageResolver(messageResolver); 
     Validator.setContextRenderer(new ResourceBundleValidationContextRenderer()); 
     List<ConstraintViolation> LS = validator.validate(formObject); 
     return LS; 

如果我删除模式然后正常工作的方法。任何建议。

Answer 1

的XStream的RegExPatternConverter预计正常XML元素作为孩子，而不是属性：

<pattern> 
    <pattern>^[a-z0-9]$</pattern> 
    <flags>0</flags> 
</pattern>