今天竟然遇到这样一个问题， 好好的tomcat， 执行上传的时候，
程序崩溃， 没有任何提示！没有异常！没有任何错误日志。。。
原因竟然是hibernate的这一行：
Department department = departmentService.queryByPK(Department.class, departmentId);
hbm 文件如下：
<?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="net.sa.common.model.Department" table="sa_department">
<id name="id" type="java.lang.Integer">
<column name="department_id" />
<generator class="native"></generator>
</id>
<property name="secondDepartmentId" type="java.lang.String">
<column name="second_department_id"/>
</property>
<property name="secondParentId" type="java.lang.String">
<column name="second_parent_id"/>
</property>
<property name="name" type="java.lang.String">
<column name="department_name" length="50"/>
</property>
<property name="initials" type="java.lang.String">
<column name="initials" length="100"/>
</property>
<property name="description" type="java.lang.String">
<column name="department_description" length="255"/>
</property>
<property name="status" type="java.lang.Integer">
<column name="status"/>
</property>
<property name="sequence" type="java.lang.Integer">
<column name="sequence" />
</property>
<property name="sequenceNo" type="java.lang.Integer">
<column name="sequenceNo" />
</property>
<property name="updStatusVer" type="long">
<column name="updStatusVer"/>
</property>
<property name="displayName" type="java.lang.String">
<column name="display_name"/>
</property>
<property name="address" type="java.lang.String">
<column name="address"/>
</property>
<property name="telephone" type="java.lang.String">
<column name="telephone"/>
</property>
<property name="path" type="java.lang.String">
<column name="path"/>
</property>
<property name="grade" type="java.lang.Integer">
<column name="grade"/>
</property>
<property name="storePoolId" type="java.lang.Long">
<column name="storePoolId"/>
</property>
<many-to-one name="parent" class="net.sa.common.model.Department" lazy="false" insert="true" update="true" column="parent_id" not-found="ignore" ></many-to-one>
<!--
<set name="childs" lazy="false" inverse="true" cascade="none"
order-by="sequence asc,sequenceNo asc,department_id asc" where="status>=0">
<key column="parent_id"></key>
<one-to-many class="net.sa.common.model.Department" />
</set>
-->
</class>
</hibernate-mapping>
因为每次查询department 会去获取其 parent， 而department 层级也就 10多层深， 竟然导致了 程序崩溃。。。。
-Xss128k 改成 -Xss256k 之后， 好了！
