BUG #12851: Failed to initial Jackrabbit JCR Repository

The following bug has been logged on the website:

Bug reference:      12851
Logged by:          Harry Hui
Email address:      chhui@ps.asl.com.hk
PostgreSQL version: 9.4.0
Operating system:   Fedora 20 x86 64Bit
Description:

I had set up PostgreSQL 9.4 DBR version on Fedora 20. There are two
instances of PostgreSQL to perform the replication. This function was
working fine. However, I started a Jackrabbit JCR repository with
persistence manager
[org.apache.jackrabbit.core.persistence.bundle.PostgreSQLPersistenceManager].
It could not start with PostgreSQL DBR.
It throw exception below. This exception only happened in DBR version.
Normal PostgreSQL 4.0 is working fine with Jackrabbit.
11.03.2015 11:12:48 DEBUG localhost-startStop-1 [StatManager.init:48]
Started StatManager. QueryStat is enabled false
11.03.2015 11:12:48 INFO  localhost-startStop-1 [RepositoryImpl.<init>:256]
Starting repository...
11.03.2015 11:13:06 ERROR localhost-startStop-1
[ConnectionHelper$RetryManager.doTry:548] Failed to execute SQL (stacktrace
on DEBUG log level): org.postgresql.util.PSQLException: ERROR: Cannot UPDATE
table repository_fsentry because it does not have primary key.
  Hint: Add primary key to the table
11.03.2015 11:13:06 DEBUG localhost-startStop-1
[ConnectionHelper$RetryManager.doTry:549] Failed to execute SQL
org.postgresql.util.PSQLException: ERROR: Cannot UPDATE table
repository_fsentry because it does not have primary key.
  Hint: Add primary key to the table