Dashboard crashes after a day of operation

Description:
The dashboard keeps crashing after a day of operation. Following error log was observed in logs. We need to upgrade eclipselink jpa library.

05:26:21.444 [https-jsse-nio-8443-exec-6] ERROR org.wso2.testgrid.web.api.ProductService - Error occurred while fetching the Product statuses 
org.wso2.testgrid.dao.TestGridDAOException: Error occurred when searching for entity.
	at org.wso2.testgrid.dao.repository.AbstractRepository.findAll(AbstractRepository.java:165) ~[org.wso2.testgrid.dao-1.0.5-SNAPSHOT.jar:1.0.5-SNAPSHOT]
	at org.wso2.testgrid.dao.repository.ProductRepository.findAll(ProductRepository.java:104) ~[org.wso2.testgrid.dao-1.0.5-SNAPSHOT.jar:1.0.5-SNAPSHOT]
	at org.wso2.testgrid.dao.uow.ProductUOW.getProducts(ProductUOW.java:82) ~[org.wso2.testgrid.dao-1.0.5-SNAPSHOT.jar:1.0.5-SNAPSHOT]
	at org.wso2.testgrid.web.api.ProductService.getAllProductStatuses(ProductService.java:125) [classes/:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_151]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_151]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_151]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_151]
	at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) [jersey-server-2.22.2.jar:?]
....
Caused by: java.lang.NullPointerException
	at org.eclipse.persistence.internal.sessions.AbstractSession.executeDeferredEvents(AbstractSession.java:1189) ~[org.eclipse.persistence.core-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2843) ~[org.eclipse.persistence.core-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1521) ~[org.eclipse.persistence.core-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1503) ~[org.eclipse.persistence.core-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1477) ~[org.eclipse.persistence.core-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:484) ~[org.eclipse.persistence.jpa-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:741) ~[org.eclipse.persistence.jpa-2.2.0.jar:2.2.0.v20110202-r8913]
	at org.wso2.testgrid.dao.repository.AbstractRepository.findAll(AbstractRepository.java:163) ~[org.wso2.testgrid.dao-1.0.5-SNAPSHOT.jar:1.0.5-SNAPSHOT]
	... 54 more

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Steps to reproduce:

Related Issues:

Start with AbstractRepository.findAll at line 163 and ProductRepository.findAll at line 104, following the stack trace into ProductUOW.getProducts and ProductService.getAllProductStatuses. Check how the EclipseLink JPA version is declared and whether the deferred-event NullPointerException can be reproduced after prolonged operation. Done means the dashboard remains available after a day without this exception.