org.postgresql.util.PSQLException: ERROR: canceling statement due to conflict with recovery
  Detail: User query might have needed to see row versions that must be removed.
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2103)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1836)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:512)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:273)
    at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:82)
    at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:82)
    at cl.waypoint.mailer.reportes.BasicReport.getSingleColumn(BasicReport.java:542)
    at cl.waypoint.mailer.reportes.BasicReport.getSingleColumn(BasicReport.java:518)
    at cl.waypoint.mailer.reportes.StatusSemanalClientes.updateIgnicion(StatusSemanalClientes.java:448)
    at cl.waypoint.mailer.reportes.StatusSemanalClientes.access$2(StatusSemanalClientes.java:447)
    at cl.waypoint.mailer.reportes.StatusSemanalClientes$TempAndDoorLocator.call(StatusSemanalClientes.java:414)
    at cl.waypoint.mailer.reportes.StatusSemanalClientes$TempAndDoorLocator.call(StatusSemanalClientes.java:1)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)

PostgreSQL 9.4.9 on x86_64-unknown-linux-gnu, compiled by gcc (Debian 4.9.2-10) 4.9.2, 64-bit

Distributor ID: Debian
Description:    Debian GNU/Linux 8.6 (jessie)
Release:    8.6
Codename:   jessie