RepositoryServlet: Unclosed session detected

When I access the RepositoryServlet on http://localhost:8080/cms/repository I get:

[INFO] [talledLocalContainer] 30.12.2014 16:37:05 WARN Finalizer [SessionImpl.finalize:1332] Unclosed session detected. The session was opened here:
[INFO] [talledLocalContainer] java.lang.Exception: Stack Trace
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.SessionImpl.<init>(SessionImpl.java:226)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.SessionImpl.<init>(SessionImpl.java:243)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.XASessionImpl.<init>(XASessionImpl.java:106)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.XASessionImpl.<init>(XASessionImpl.java:66)
[INFO] [talledLocalContainer] at org.hippoecm.repository.jackrabbit.RepositoryImpl.createSessionInstance(RepositoryImpl.java:175)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.RepositoryImpl.createSession(RepositoryImpl.java:956)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.RepositoryImpl.login(RepositoryImpl.java:1501)
[INFO] [talledLocalContainer] at org.hippoecm.repository.impl.RepositoryDecorator.login(RepositoryDecorator.java:59)
[INFO] [talledLocalContainer] at org.hippoecm.repository.HippoRepositoryImpl.login(HippoRepositoryImpl.java:109)
[INFO] [talledLocalContainer] at org.hippoecm.repository.HippoRepositoryImpl.login(HippoRepositoryImpl.java:126)
[INFO] [talledLocalContainer] at org.hippoecm.repository.FormAuth.login(FormAuth.java:79)
[INFO] [talledLocalContainer] at org.hippoecm.repository.FormAuth.authorize(FormAuth.java:62)
[INFO] [talledLocalContainer] at org.hippoecm.repository.RepositoryServlet.service(RepositoryServlet.java:322)
[INFO] [talledLocalContainer] at javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:263)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201)
[INFO] [talledLocalContainer] at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.login.ConcurrentLoginFilter.doFilter(ConcurrentLoginFilter.java:54)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
[INFO] [talledLocalContainer] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
[INFO] [talledLocalContainer] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
[INFO] [talledLocalContainer] at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610)
[INFO] [talledLocalContainer] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
[INFO] [talledLocalContainer] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537)
[INFO] [talledLocalContainer] at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1085)
[INFO] [talledLocalContainer] at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658)
[INFO] [talledLocalContainer] at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1556)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1513)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[INFO] [talledLocalContainer] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[INFO] [talledLocalContainer] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
[INFO] [talledLocalContainer] at java.lang.Thread.run(Thread.java:745)