org.xml.sax.SAXParseException:Element "class" does not allow "propert" here.

检查了一下，发现自己在.java文件和hibernate中class的name不一致导致的。

hbm.xml:

<class name = "ParticleInfo">
     <cache usage = "read-write"/>
     <id name="id">
        <generator class="sequence">
           <param name = "sequence">env_Particle_Info_SEQ</param>
        </generator>
     </id>
    <property name="sampleDate"/>
   
 </class>

ParticleInfo.java

public class ParticleInfo extends Entity{

   private Date sampleDate;
   
  
  
 public Date getSampleDate() {
  return sampleDate;
 }
 public void setSampleDate(Date sampleDate) {
  this.sampleDate = sampleDate;
 }
  }