org.springframework.orm.hibernate3.HibernateSystemException: could not deserialize; nested exception is org.hibernate.type.SerializationException: could not deserialize

以上是报错信息，网上查到的是说字段类型没有设置对应的类型，或者类型设置错误，这里根据我自己的实际情况，做一下补充情况

当在xml文件中设置字段的类型为枚举类型时，不能直接设置为枚举对象类，比如：

这样就不对了，无法解析，枚举类型应该要通过枚举类来解析，如下：

EnumUserType类如下：

package com.**.**.dao.usertype;import java.io.Serializable;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Types;import org.hibernate.HibernateException;import org.hibernate.usertype.UserType;public class EnumUserType
     
      > implements UserType {	private Class
      
        clacz	= null;	protected EnumUserType(Class
       
         c) {		this.clacz = c;	}	private static final int[]	SQL_TYPES	= { Types.VARCHAR };	public int[] sqlTypes() {		return SQL_TYPES;	}	public Class
        
          returnedClass() {		return clacz;	}	public Object nullSafeGet( ResultSet resultSet, String[] names, Object owner )			throws HibernateException, SQLException {		String name = resultSet.getString( names[0] );		E result = null;		if ( !resultSet.wasNull() ) {			result = Enum.valueOf( clacz, name );		}		return result;	}	public void nullSafeSet( PreparedStatement preparedStatement, Object value,			int index ) throws HibernateException, SQLException {		if ( null == value ) {			preparedStatement.setNull( index, Types.VARCHAR );		} else {			preparedStatement.setString( index, ((Enum
         ) value).name() );		}	}	public Object deepCopy( Object value ) throws HibernateException {		return value;	}	public boolean isMutable() {		return false;	}	public Object assemble( Serializable cached, Object owner )			throws HibernateException {		return cached;	}	public Serializable disassemble( Object value ) throws HibernateException {		return (Serializable) value;	}	public Object replace( Object original, Object target, Object owner )			throws HibernateException {		return original;	}	public int hashCode( Object x ) throws HibernateException {		return x.hashCode();	}	public boolean equals( Object x, Object y ) throws HibernateException {		if ( x == y )			return true;		if ( null == x || null == y )			return false;		return x.equals( y );	}}
        
       
      
     

　　

以上仅是这类错误的一种原因，记录一下