JSF数据库连接池

除夕快乐。我有一个数据库连接池——我想这就是问题所在。当我点击这个页面的链接时，Schedule Now，一切正常。在bean的构造函数中创建了一个数据库连接，因为我在这个bean中有几个方法可以读/写数据库，所以我不想每次都打开一个新的连接。因此，我有一个方法共享的全局连接变量。只要我在再次点击链接之前花点时间，一切都很好。但是，如果我快速单击指向页面的链接。click.click.click.click，我得到错误org.apache.tomcat.dbcp.dbcp.SQLNestedException:无法获得连接，池错误等待空闲对象超时。如何防止应用程序给我这个错误？无论我请求页面的速度有多快，如何通过单击链接使连接每次都可用？我已尝试更改content.xml；对于maxWait=2000，在content.xml中，我还尝试了maxWait=-1。任何帮助或链接到教程或任何有帮助的阅读都将不胜感激

多谢各位

下面是带有相关代码的bean

@ManagedBean(name = "scheduleAppBean")
@ViewScoped
public class ScheduleAppBean {
/* 
variables omitted
 */
//datasource to access database
@Resource(name="jdbc/mydb") private DataSource source;
private Connection   conn;

//constructor
public ScheduleAppBean(){
    job= new ArrayList<ScheduleAppHelper>();
    propertiesOptions= new ArrayList<SelectItem>();
    try {            
        Context ctx = (Context) new InitialContext();
          source = (DataSource) ((InitialContext) ctx).lookup("java:comp/env/jdbc/mydb");
       conn=source.getConnection();
    } catch (NamingException ex) {
        Logger.getLogger(SchedulesBean.class.getName()).log(Level.SEVERE, null, ex);
    }catch (SQLException ex) {
        Logger.getLogger(ScheduleBean.class.getName()).log(Level.SEVERE, null, ex);
    }
}

//called when page first loads to fill propertiesOptions list

public void loadProperties(){
   // clear any previous list data
    propertiesOptions.clear();
    try { 

       Connection conn=getDatabaseConnection();
       PreparedStatement query= conn.prepareStatement("select propName from property;");
       ResultSet result= query.executeQuery();
       // reset variable to zero in case some data is present
       propertiesNumber=0;
       //track current customer number
       int count=0;
       //retrieve all clients and add to list, update propertiesNumber
       while(result.next()){
           propertiesOptions.add(new SelectItem(result.getString("propName")));
           //increment variables
           propertiesNumber++;
           count++;
       }


    } catch(Exception ex){
            Logger.getLogger(ScheduleBean.class.getName()).log(Level.SEVERE, null, ex);
        }

}

private Connection getDatabaseConnection(){       
    if(conn!=null)
        return conn;
    else{
        try {            
            Context ctx = (Context) new InitialContext();
            source = (DataSource) ((InitialContext) ctx).lookup("java:comp/env/jdbc/mydb");
            conn=source.getConnection();
            return conn;
            } catch (NamingException ex) {
                Logger.getLogger(SchedulesBean.class.getName()).log(Level.SEVERE, null, ex);
            }catch (SQLException ex) {
                 Logger.getLogger(ScheduleBean.class.getName()).log(Level.SEVERE, null, ex);
            }catch(Exception ex){
                Logger.getLogger(ScheduleBean.class.getName()).log(Level.SEVERE, null, ex);
            }

    }
    return conn;
}

}

下面是context.xml

<Resource auth="Container" driverClassName="com.mysql.jdbc.Driver" removeAbandoned="true"
 maxActive="20" maxIdle="10" maxWait="2000" name="jdbc/mydb" password="*****" 
type="javax.sql.DataSource"   url="jdbc:mysql://localhost:3306/******"username="*****"/>

这是我的JSF页面

<h:body onload="#{scheduleAppBean.loadProperties()}">
 <div class="scheduleNavigation">
            <ul>
                <li>
                    <h:form>
                        <h:commandLink value="Assign Schedule" styleClass="mainHeader" action="../administrator/assignschedule.xhtml">
                        </h:commandLink>
                    </h:form>
                </li>
                <li>
                    <h:form>
                         <!--This is the link I click repeatedly-->
                         <h:commandLink value="Schedule Now" styleClass="mainHeader" action="../administrator/appointments.xhtml">
                        </h:commandLink>
                    </h:form>
                </li>
                <li>
                    <h:form>
                        <h:commandLink value="My Schedule" styleClass="mainHeader" action="../administrator/myschedule.xhtml">
                        </h:commandLink>
                    </h:form>
                </li>
            </ul>
        </div>
</h:body>

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环顾四周，我发现这个链接非常有用。