Создание навигации через бд ошибка потоков

<%@page import="bean.Genre" %>
<%@page import="bean.MainGenre" %>
<%@ page pageEncoding="UTF-8" %>
 
 
<div class="leftcolumn">
    <div class="menuleft">
        <div class="top"></div>
        <div class="m-center">
            <ul id="menuLeft">
                <jsp:useBean id="mainGenreList" class="bean.MainGenreList" scope="application" />
                <jsp:useBean id="GenreList" class="bean.GenreList" scope="application" />
                <%
                    for (MainGenre mainGenre : mainGenreList.getGenreList()) {
                %>
                <li><a href="index.jsp?mainGenre_id=<%= mainGenre.getName()%>" title="<%= mainGenre.getName()%>"><%= mainGenre.getName()%></a> <span></span></li>
 
                    <%
                        for (Genre genre : GenreList.getAllGenresByMainGenre(mainGenre.getId())) {
                    %>
                    <!--<ul class="d_none">-->
                        <li><a href="index.jsp?Genre_id=<%= genre.getName()%>" title="<%= genre.getName()%>"><%= genre.getName()%></a></li>
                    <!--</ul>-->
                <!--</li>-->
                <% }%>
                <% }%>
            </ul>
        </div>
        <div class="bottom"></div>
    </div><!--END menuleft -->
</div><!--END leftcolumn -->

INFO: java.sql.SQLException: Connection closed
    at com.sun.gjc.spi.base.ConnectionHolder.checkValidity(ConnectionHolder.java:730)
    at com.sun.gjc.spi.base.ConnectionHolder.createStatement(ConnectionHolder.java:254)
    at com.sun.gjc.spi.jdbc40.ConnectionWrapper40.createStatement(ConnectionWrapper40.java:75)
    at bean.GenreList.getGenres(GenreList.java:24)
    at bean.GenreList.getAllGenresByMainGenre(GenreList.java:50)
    at org.apache.jsp.pages.index_jsp._jspService(index_jsp.java:130)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:411)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:473)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:377)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:724)