I m working on dspace 1.8.2. I deal with jspui and postgres 8.4.9.
I get following error most of time , which i mention bellow


org.apache.commons.dbcp.SQLNestedException: Cannot get a connection,
pool error Timeout waiting for idle object
        at 
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:114)
        at 
org.dspace.storage.rdbms.DatabaseManager.getConnection(DatabaseManager.java:588)
        at org.dspace.core.Context.<init>(Context.java:95)
        at org.dspace.app.webui.util.UIUtil.obtainContext(UIUtil.java:98)
        at 
org.dspace.app.webui.servlet.DSpaceServlet.processRequest(DSpaceServlet.java:418)
        at 
org.dspace.app.webui.servlet.DSpaceServlet.doGet(DSpaceServlet.java:210)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.dspace.utils.servlet.DSpaceWebappServletFilter.doFilter(DSpaceWebappServletFilter.java:78)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
        at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183)
        at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95)
        at 
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
        at 
org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at 
org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at 
org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.internalProcess(ActiveRequestResponseCacheValve.java:74)
        at 
org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:47)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
        at 
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:599)
        at 
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451)
        at java.lang.Thread.run(Thread.java:679)
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object
        at 
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:958)
        at 
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:106)
        ... 32 more


-- 
Thanks
Awanish Singh
9910287114
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