org.hibernate.LazyInitializationException: could not initialize proxy

今天在写jbpm获取流程变量的时候出现了这个异常：org.hibernate.LazyInitializationException: could not initialize proxy - no Session
原因就是jbpm的底层采用了懒加载的方式，解决这个异常的方法就是在对象的映射文件中去掉默认的懒加载，例如：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="cn.itcast.jbpm.processVariable.Form" table="itcast_form" lazy="false"><id name="id" type="long"><column name="id"></column><generator class="increment"></generator></id><property name="title" type="string"><column name="title"></column></property></class>
</hibernate-mapping>
方法一：lazy默认是true，改成false就不会出现该异常了。

方法二：就是把这个类改成final类型的，这样它就不会产生代理对象了，如下：
package cn.itcast.jbpm.processVariable;public final class Form {private Long id;private String title;public Form(){}public Form(Long id, String title) {this.id = id;this.title = title;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}
}

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