Cannot get a connection, pool error Timeout waiting for idle object :sakai

StackOverflow https://stackoverflow.com/questions/21901105

Question

iam using sakai 2.9.1 after a few operations the server stops responding and prints log:- 

2014-02-20 12:48:47,085 WARN http-bio-8080-exec-18 org.sakaiproject.db.impl.BasicSqlService - Sql.dbRead: sql: select SAKAI_SITE.SITE_ID,SAKAI_SITE.TITLE,SAKAI_SITE.TYPE,SAKAI_SITE.SHO 
RT_DESC,SAKAI_SITE.DESCRIPTION,SAKAI_SITE.ICON_URL,SAKAI_SITE.INFO_URL,SAKAI_SITE.SKIN,SAKAI_SITE.PUBLISHED,SAKAI_SITE.JOINABLE,SAKAI_SITE.PUBVIEW,SAKAI_SITE.JOIN_ROLE,SAKAI_SITE.IS_SPE
CIAL,SAKAI_SITE.IS_USER,SAKAI_SITE.CREATEDBY,SAKAI_SITE.MODIFIEDBY,SAKAI_SITE.CREATEDON,SAKAI_SITE.MODIFIEDON,SAKAI_SITE.CUSTOM_PAGE_ORDERED,SAKAI_SITE.IS_SOFTLY_DELETED,SAKAI_SITE.SOFT
LY_DELETED_DATE from SAKAI_SITE where ( SITE_ID = ? ) !admin 
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:104) 
        at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) 
        at org.sakaiproject.db.impl.BasicSqlService.borrowConnection(BasicSqlService.java:260) 
        at org.sakaiproject.db.impl.BasicSqlService.dbRead(BasicSqlService.java:540) 
        at org.sakaiproject.util.BaseDbFlatStorage.getResource(BaseDbFlatStorage.java:341) 
        at org.sakaiproject.util.BaseDbFlatStorage.getResource(BaseDbFlatStorage.java:321) 
        at org.sakaiproject.site.impl.DbSiteService$DbStorage.get(DbSiteService.java:236) 
        at org.sakaiproject.site.impl.BaseSiteService.getDefinedSite(BaseSiteService.java:616) 
        at org.sakaiproject.site.impl.BaseSiteService.getSite(BaseSiteService.java:702) 
        at org.sakaiproject.site.impl.BaseSiteService.getSiteVisit(BaseSiteService.java:780) 
        at org.sakaiproject.site.cover.SiteService.getSiteVisit(SiteService.java:140) 
        at org.sakaiproject.presence.tool.PresenceTool.doGet(PresenceTool.java:141) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:634) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684) 
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471) 
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:369) 
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329) 
        at org.sakaiproject.tool.impl.ActiveToolComponent$MyActiveTool.forward(ActiveToolComponent.java:511) 
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.forwardTool(SkinnableCharonPortal.java:1470) 
        at org.sakaiproject.portal.charon.handlers.PresenceHandler.doPresence(PresenceHandler.java:140) 
        at org.sakaiproject.portal.charon.handlers.PresenceHandler.doGet(PresenceHandler.java:70) 
        at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:881) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) 
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
        at org.sakaiproject.util.RequestFilter.doFilter(RequestFilter.java:695) 
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) 
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) 
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) 
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) 
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) 
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) 
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) 
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) 
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) 
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) 
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
        at java.lang.Thread.run(Thread.java:619) 
Caused by: java.util.NoSuchElementException: Timeout waiting for idle object 
        at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1167) 
        at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
Was it helpful?

Solution

You probably need to increase the size of your connection pool. You may need to also adjust the DBMS settings for your database. Here are the settings which you would put into your Sakai configuration file (typically sakai.properties) to control the database pooling.

# The initial number of connections that are created when the pool is started
initialSize@javax.sql.BaseDataSource=10
# The maximum number of active connections that can be allocated from this pool at the same time, or zero for no limit.
maxActive@javax.sql.BaseDataSource=50
# The maximum number of active connections that can remain idle in the pool, without extra ones being released, or zero for no limit.
maxIdle@javax.sql.BaseDataSource=5
# The minimum number of active connections that can remain idle in the pool, without extra ones being created, or 0 to create none.
minIdle@javax.sql.BaseDataSource=5
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