请大家帮我看看到底应该怎么修改

最近刚开始研究osworkflow，出现了问题，有点郁闷，请大家看看。

我的数据库表创建文件为：  mysql.sql

drop table if exists OS_PROPERTYENTRY cascade;
create table OS_PROPERTYENTRY
(
GLOBAL_KEY varchar(250) NOT NULL,
ITEM_KEY varchar(250) NOT NULL,
ITEM_TYPE tinyint,
STRING_VALUE varchar(255),
DATE_VALUE datetime,
DATA_VALUE blob,
FLOAT_VALUE float,
NUMBER_VALUE numeric,
primary key (GLOBAL_KEY, ITEM_KEY)
)TYPE=InnoDB;

-- Beginning of Default OSUser tables
drop table if exists OS_USER cascade;
create table OS_USER
(
    USERNAME varchar(100) NOT NULL,
    PASSWORDHASH mediumtext,
    primary key (USERNAME),
    index(USERNAME)
)TYPE=InnoDB;


drop table if exists OS_GROUP cascade;
create table OS_GROUP
(
    GROUPNAME varchar(20) NOT NULL,
    primary key (GROUPNAME)
)TYPE=InnoDB;

drop table if exists OS_MEMBERSHIP cascade;
create table OS_MEMBERSHIP
(
    USERNAME varchar(20) NOT NULL,
    GROUPNAME varchar(20) NOT NULL,
    primary key (USERNAME, GROUPNAME),
    index (USERNAME),
    foreign key (USERNAME) references OS_USER(USERNAME),
    index (GROUPNAME),
    foreign key (GROUPNAME) references OS_GROUP(GROUPNAME)
)TYPE=InnoDB;

-- End of Default OSUser tables



drop table if exists OS_WFENTRY cascade;
create table OS_WFENTRY
(
    ID bigint NOT NULL,
    NAME varchar(60),
    STATE integer,
    primary key (ID)
)TYPE=InnoDB;


drop table if exists OS_CURRENTSTEP;
create table OS_CURRENTSTEP
(
    ID bigint NOT NULL,
    ENTRY_ID bigint,
    STEP_ID integer,
    ACTION_ID integer,
    OWNER varchar(35),
    START_DATE datetime,
    FINISH_DATE datetime,
    DUE_DATE datetime,
    STATUS varchar(40),
CALLER varchar(35),

    primary key (ID),
    index (ENTRY_ID),
    foreign key (ENTRY_ID) references OS_WFENTRY(ID),
    index (OWNER),
    foreign key (OWNER) references OS_USER(USERNAME),
    index (CALLER),
    foreign key (CALLER) references OS_USER(USERNAME)
)TYPE=InnoDB;

drop table if exists OS_HISTORYSTEP;
create table OS_HISTORYSTEP
(
    ID bigint NOT NULL,
    ENTRY_ID bigint,
    STEP_ID integer,
    ACTION_ID integer,
    OWNER varchar(35),
    START_DATE datetime,
    FINISH_DATE datetime,
    DUE_DATE datetime,
    STATUS varchar(40),
    CALLER varchar(35),

    primary key (ID),
    index (ENTRY_ID),
    foreign key (ENTRY_ID) references OS_WFENTRY(ID),
    index (OWNER),
    foreign key (OWNER) references OS_USER(USERNAME),
    index (CALLER),
    foreign key (CALLER) references OS_USER(USERNAME)
)TYPE=InnoDB;

drop table if exists OS_CURRENTSTEP_PREV;
create table OS_CURRENTSTEP_PREV
(
    ID bigint NOT NULL,
    PREVIOUS_ID bigint NOT NULL,
    primary key (ID, PREVIOUS_ID),
    index (ID),
    foreign key (ID) references OS_CURRENTSTEP(ID),
    index (PREVIOUS_ID),
    foreign key (PREVIOUS_ID) references OS_HISTORYSTEP(ID)
)TYPE=InnoDB;

drop table if exists OS_HISTORYSTEP_PREV;
create table OS_HISTORYSTEP_PREV
(
    ID bigint NOT NULL,
    PREVIOUS_ID bigint NOT NULL,
    primary key (ID, PREVIOUS_ID),
    index (ID),
    foreign key (ID) references OS_HISTORYSTEP(ID),
    index (PREVIOUS_ID),
    foreign key (PREVIOUS_ID) references OS_HISTORYSTEP(ID)
)TYPE=InnoDB;

drop table if exists OS_STEPIDS;
CREATE TABLE OS_STEPIDS
(
ID bigint NOT NULL AUTO_INCREMENT,
PRIMARY KEY (id)
)TYPE=InnoDB;

drop table if exists OS_ENTRYIDS;
CREATE TABLE OS_ENTRYIDS
(
ID bigint NOT NULL AUTO_INCREMENT,
PRIMARY KEY (id)
)TYPE=InnoDB;


数据初始化文件为： initdata.sql

INSERT INTO OS_USER (USERNAME,PASSWORDHASH) VALUES ('employee1','123');
INSERT INTO OS_USER (USERNAME,PASSWORDHASH) VALUES ('hr1','123');
INSERT INTO OS_USER (USERNAME,PASSWORDHASH) VALUES ('manager1','123');

INSERT INTO OS_GROUP (GROUPNAME) VALUES ('employee');
INSERT INTO OS_GROUP (GROUPNAME) VALUES ('hr');
INSERT INTO OS_GROUP (GROUPNAME) VALUES ('manager');

INSERT INTO OS_MEMBERSHIP (USERNAME,GROUPNAME) VALUES ('employee1','employee');
INSERT INTO OS_MEMBERSHIP (USERNAME,GROUPNAME) VALUES ('hr1','hr');
INSERT INTO OS_MEMBERSHIP (USERNAME,GROUPNAME) VALUES ('manager1','manager');


我的流程定义文件为： leave_apply.xml

<?xml version="1.0" encoding="GBK"?>
<!DOCTYPE workflow PUBLIC "-//OpenSymphony Group//DTD OSWorkflow 2.6//EN" "http://www.opensymphony.com/osworkflow/workflow_2_8.dtd">
<workflow>
	<initial-actions>
		<action id="100" name="启动请假申请工作流">
			<results>
				<unconditional-result old-status="Finished"
					status="Underway" step="1" />
			</results>
		</action>
	</initial-actions>
	<steps>
		<step id="1" name="请假申请">
			<actions>
				<action id="1" name="提交需求申请">
					<restrict-to>
						<conditions type="AND">
							<condition type="class">
								<arg name="class.name">
									com.opensymphony.workflow.util.OSUserGroupCondition
								</arg>
								<arg name="group">employee</arg>
							</condition>
						</conditions>
					</restrict-to>
					<pre-functions>
						<function type="class">
							<arg name="class.name">
								com.osworkflow.leave.ApplyFunction
							</arg>
						</function>
					</pre-functions>
					<results>
						<result old-status="Finished" status="Underway"
							step="2" owner="manager1">
							<conditions type="AND">
								<condition type="beanshell">
									<arg name="script">
										propertySet.getInt("dayCount")>3
									</arg>
								</condition>
							</conditions>
							<post-functions>
								<function type="beanshell">
									<arg name="script">
										System.out.println("步骤 1 提交需求申请满足条件结果 需部门经理审批...");
									</arg>
								</function>
							</post-functions>
						</result>
						<unconditional-result old-status="Finished"
							status="Underway" step="3" owner="hr1" />
					</results>
				</action>
			</actions>
		</step>
		<step id="2" name="请假申请审核">
			<actions>
				<action id="2" name="部门主管审批请假申请">
					<restrict-to>
						<conditions type="AND">
							<condition type="beanshell">
								<arg name="script">true</arg>
							</condition>
							<condition type="class">
								<arg name="class.name">
									com.opensymphony.workflow.util.StatusCondition
								</arg>
								<arg name="status">Underway</arg>
							</condition>
							<condition type="class">
								<arg name="class.name">
									com.opensymphony.workflow.util.OSUserGroupCondition
								</arg>
								<arg name="group">manager</arg>
							</condition>
						</conditions>
					</restrict-to>
					<pre-functions>
						<function type="class">
							<arg name="class.name">
								com.osworkflow.leave.ApproveFunction
							</arg>
						</function>
					</pre-functions>
					<results>
						<result old-status="Finished" status="Underway"
							step="5">
							<conditions type="AND">
								<condition type="beanshell">
									<arg name="script">
										propertySet.getInt("opinion")==2
									</arg>
								</condition>
							</conditions>
							<post-functions>
								<function type="beanshell">
									<arg name="script">
										System.out.println("步骤 2 请假申请审核部门经理审批没有通过 ...");
									</arg>
								</function>
							</post-functions>
						</result>
						<unconditional-result old-status="Finished"
							status="Underway" step="3" owner="hr1" />
					</results>
				</action>
			</actions>
		</step>
		<step id="3" name="请假申请审核">
			<actions>
				<action id="3" name="人力资源主管审批请假申请">
					<pre-functions>
						<function type="class">
							<arg name="class.name">
								com.osworkflow.leave.ApproveFunction
							</arg>
						</function>
					</pre-functions>
					<results>
						<result old-status="Finished" status="Underway"
							step="5">
							<conditions type="AND">
								<condition type="beanshell">
									<arg name="script">
										propertySet.getInt("opinion")==2
									</arg>
								</condition>
							</conditions>
						</result>
						<unconditional-result old-status="Finished"
							status="Underway" step="5" />
					</results>
				</action>
			</actions>
		</step>
		<step id="4" name="请假申请结果通知">
			<actions>
				<action id="4" auto="true" name="请假申请获准邮件通知">
					<pre-functions>
						<function type="beanshell">
							<arg name="script">
								System.out.println("步骤 4 自动动作 请假申请获准邮件通知Send mail 祝贺你");
							</arg>
						</function>
					</pre-functions>
					<results>
						<unconditional-result old-status="Finished"
							status="Finished" step="6" />
					</results>
				</action>
			</actions>
		</step>
		<step id="5" name="请假申请结果通知">
			<actions>
				<action id="5" auto="true" name="请假申请没能获准邮件通知">
					<pre-functions>
						<function type="beanshell"> 
							<arg name="script">
								System.out.println("步骤 5 自动动作 请假申请未获准邮件通知Send mail ");
							</arg> 
						</function>
					</pre-functions>
					<results>
						<unconditional-result old-status="Finished" status="Finished" step="6" />
					</results>
				</action>
			</actions>
		</step>
		<step id="6" name="flow over"></step>
	</steps>
</workflow>

osworkflow.xml文件为：

<osworkflow>
<persistence class="com.opensymphony.workflow.spi.jdbc.MySQLWorkflowStore">
 <property key="datasource" value="jdbc/osworkflow"/>
 
    <property key="step.sequence.increment"  value="INSERT INTO OS_STEPIDS (ID) values (null)"/>
    <property key="step.sequence.retrieve"   value="SELECT count(ID) FROM OS_STEPIDS"/>
    <property key="entry.sequence.increment" value="INSERT INTO OS_ENTRYIDS (ID) values (null)"/>
    <property key="entry.sequence.retrieve"  value="SELECT count(ID) FROM OS_ENTRYIDS"/>
   
 <property key="entry.table" value="OS_WFENTRY"/>
 <property key="entry.id" value="ID"/>
 <property key="entry.name" value="NAME"/>
 <property key="entry.state" value="STATE"/>
 


 <property key="history.table" value="OS_HISTORYSTEP"/>
 <property key="current.table" value="OS_CURRENTSTEP"/>
 <property key="historyPrev.table" value="OS_HISTORYSTEP_PREV"/>
 <property key="currentPrev.table" value="OS_CURRENTSTEP_PREV"/>
 <property key="step.id" value="ID"/>
 <property key="step.entryId" value="ENTRY_ID"/>
 <property key="step.stepId" value="STEP_ID"/>
 <property key="step.actionId" value="ACTION_ID"/>
 <property key="step.owner" value="OWNER"/>
 <property key="step.caller" value="CALLER"/>
 <property key="step.startDate" value="START_DATE"/>
 <property key="step.finishDate" value="FINISH_DATE"/>
 <property key="step.dueDate" value="DUE_DATE"/>
 <property key="step.status" value="STATUS"/>
 <property key="step.previousId" value="PREVIOUS_ID"/>

    
 </persistence>
 
 <factory class="com.opensymphony.workflow.loader.XMLWorkflowFactory">
  <property key="resource" value="workflows.xml"/>
 </factory>
</osworkflow>

默认的项目界面：  default.jsp

<%@ page import="com.opensymphony.util.TextUtils"%>
<%@ page contentType="text/html;charset=GBK"%>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />

 <html>
    <head>
        <title>OSWorkflow Example App</title>
    </head>

    <body>

    <p>
    请假申请管理系统
    <form method="POST" action="myprocess/login.jsp">
    <table border="0">
        <tr><td>用户名:</td><td><input type="text" name="username"></td></tr>
        <tr><td>密码:</td><td><input type="password" name="password"></td></tr>
        <tr><td colspan="2"><input type="submit" value=" 登陆 "></td></tr>
    </table>
    </form>

    <hr>

    </body>
</html>

login.jsp代码:

<%@ page import="com.opensymphony.user.UserManager,
                 com.opensymphony.user.EntityNotFoundException"%>
<%
    String username = request.getParameter("username");
    String password = request.getParameter("password");

    System.out.println("=================username:" + username);
    System.out.println("=================password:" + password);
    
    UserManager um = UserManager.getInstance();
    
    boolean authenticated = true;

    if (authenticated) {
        session.setAttribute("username", username);
        response.sendRedirect("nav.jsp");
    } else {
        response.sendRedirect("../default.jsp?auth_failed=true");
    }
%>

nav.jsp代码：

<%@ page contentType="text/html;charset=GBK"%>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<hr>

<a href="default.jsp">首页</a> |
<a href="leaveApply.jsp">申请请假</a> | <a href="underway.jsp">处理请假申请</a>

leaveApply.jsp代码：

<%@ page import="com.opensymphony.util.TextUtils"%>
<%@ page contentType="text/html;charset=GBK"%>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
 <html>
    <head>
        <title>OSWorkflow Example App</title>
    </head>

    <body>

    <p>
    请假申请,请填写下面请假申请单
    <form method="POST" action="leaveApplyCreate.jsp">
    <table border="0">
        <tr><td>请假原因:</td><td><input type="text" name="reason"></td></tr>
        <tr><td>请假天数:</td><td><input type="text" name="dayCount"> 整数</td></tr>
        <tr><td colspan="2"><input type="submit" value="提交申请"></td></tr>
    </table>
    </form>
    <hr>
    </body>
</html>

leaveApplyCreate.jsp代码：

<%@ page import="java.util.*,
                 com.opensymphony.user.UserManager,
                 com.opensymphony.user.EntityNotFoundException,
                 com.opensymphony.workflow.Workflow,
                 com.opensymphony.workflow.config.DefaultConfiguration,
                 com.opensymphony.workflow.basic.BasicWorkflow"%>
<%@ page contentType="text/html;charset=GBK"%>

<%
    String reason = request.getParameter("reason");
    int dayCount = Integer.parseInt((String)request.getParameter("dayCount"));
    String applicant = (String)session.getAttribute("username");
    
    System.out.println("=======从页面得到的数据:=====");
    System.out.println("reason: " + reason);
    System.out.println("dayCount: " + dayCount);
    System.out.println("applicant: " + applicant);
    
    
    Workflow wf = new BasicWorkflow((String) session.getAttribute("username"));
    DefaultConfiguration config1 = new DefaultConfiguration();
    wf.setConfiguration(config1);
    
    Map map = new HashMap();
    map.put("applicant", applicant);
    map.put("reason", reason);
    map.put("dayCount", new Integer(dayCount)); 
    
    
    System.out.println("放进map的值" );
    System.out.println("========= map.applicant:  " + map.get("applicant") );
    System.out.println("========= map.reason:  " + map.get("reason") );
    System.out.println("========= map.dayCount:  " + map.get("dayCount") );
    
      
    try {
      long wfid = wf.initialize("leave", 100, null);
      
      
      wf.doAction(wfid, 1, map);
      out.print("请假申请已经成功提交，请等待审批！");
    } catch (Exception ex){
      //out.print("提交请假申请时出现异常，可能没有增加您提交需求的权限！");
      
       ex.printStackTrace();
    }

%>
<%@ include file="nav.jsp" %>

当执行到 long wfid = wf.initialize("leave", 100, null);这一句的时候，tomcat报出如下错误：


com.opensymphony.workflow.StoreException: Unable to create current step for work
flow instance #3: root cause: Cannot add or update a child row: a foreign key co
nstraint fails (`osworkflow`.`os_currentstep`, CONSTRAINT `os_currentstep_ibfk_2
` FOREIGN KEY (`OWNER`) REFERENCES `os_user` (`USERNAME`))
        at com.opensymphony.workflow.spi.jdbc.JDBCWorkflowStore.createCurrentSte
p(JDBCWorkflowStore.java:166)
        at com.opensymphony.workflow.AbstractWorkflow.createNewCurrentStep(Abstr
actWorkflow.java:1509)
        at com.opensymphony.workflow.AbstractWorkflow.transitionWorkflow(Abstrac
tWorkflow.java:1256)
        at com.opensymphony.workflow.AbstractWorkflow.initialize(AbstractWorkflo
w.java:618)
        at org.apache.jsp.myprocess.leaveApplyCreate_jsp._jspService(leaveApplyC
reate_jsp.java:87)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:324)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:2
92)


请问哥们儿们，为什么会有外键约束冲突呢，我的数据库表os_user和os_group、os_memership里有对应的流程定义的owner和caller啊，郁闷了好几天了，在线等，谢谢啊