java - Oracle UCP and NullPointerException -


i trying integrate oracle universal connection pool (ucp) tomcat6. server configuration following:

server.xml

<resource name="jdbc/mydb"   auth="container"   factory="oracle.ucp.jdbc.pooldatasourceimpl"   type="oracle.ucp.jdbc.pooldatasource"   description="oracle universal connection pool"   connectionfactoryclassname="oracle.jdbc.pool.oracledatasource"   minpoolsize="1"   maxpoolsize="5"   inactiveconnectiontimeout="20"   connectionpoolname="ucppool"   validateconnectiononborrow="true"   sqlforvalidateconnection="select 1 dual"   fastconnectionfailoverenabled="true"   onsconfiguration="nodes=test11grac1.example.com:6200,test11grac2.example.com:6200"   user="test"   password="xxxx"   url="jdbc:oracle:thin:@test11g-cluster.example.com:1521/testdb"/>

context.xml

 <resourcelink name="jdbc/mydb" global="jdbc/mydb" />

initially configuration worked well. connections distributed evenly across 2 rac instances , when 1 instance went down subsequent request directed working one.

after night of idle time requests connection pool caused following exception:

caused by: java.lang.nullpointerexception: null     @ oracle.ucp.jdbc.oracle.oraclejdbcconnectionpool.createonepooledconnection(oraclejdbcconnectionpool.java:1260) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.common.universalconnectionpoolimpl.borrowconnectionwithoutcountingrequests(universalconnectionpoolimpl.java:339) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.common.universalconnectionpoolimpl.borrowconnectionandvalidate(universalconnectionpoolimpl.java:168) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.common.universalconnectionpoolimpl.borrowconnection(universalconnectionpoolimpl.java:143) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.jdbc.jdbcconnectionpool.borrowconnection(jdbcconnectionpool.java:157) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.jdbc.pooldatasourceimpl.getconnection(pooldatasourceimpl.java:931) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.jdbc.pooldatasourceimpl.getconnection(pooldatasourceimpl.java:873) ~[ucp.jar:11.2.0.3.0]     @ oracle.ucp.jdbc.pooldatasourceimpl.getconnection(pooldatasourceimpl.java:863) ~[ucp.jar:11.2.0.3.0]     @ org.hibernate.ejb.connection.injecteddatasourceconnectionprovider.getconnection(injecteddatasourceconnectionprovider.java:46) ~[hibernate-entitymanager-3.4.0.ga.jar:3.4.0.ga]

what may cause exception , there workaround?

after upgrading ojdbc6.jar , ucp.jar latest (12c) versions. problem magically went away.


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