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javax.servlet.ServletException: Cannot get a connection, pool exhausted	at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)	at org.apache.jsp.collection_0002dhome_jsp._jspService(collection_0002dhome_jsp.java:669)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:432)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:356)	at org.dspace.app.webui.util.JSPManager.showJSP(JSPManager.java:91)	at org.dspace.app.webui.servlet.HandleServlet.collectionHome(HandleServlet.java:488)	at org.dspace.app.webui.servlet.HandleServlet.doDSGet(HandleServlet.java:192)	at org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:151)	at org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:99)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2417)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)	at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:193)	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:309)	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:387)	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:673)	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:615)	at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:786)	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:666)	at java.lang.Thread.run(Thread.java:536)