Permission Denied exception with PostgreSQL

[sajeev sahadevan]

I am not sure this question is posting in the right discussion forum. 

While running my application, some times I'm getting the following errors. The application will halt the execution with this exception.

org.postgresql.util.PSQLException: ERROR: could not open file "base/1459687/1472150": Permission denied; State=42501; ErrorCode=0

DB.saveError: DBExecuteError - ERROR: could not open file "base/1459687/1472150": Permission denied

The same permission denied is happening for the server process too, but not all time.

org.postgresql.util.PSQLException: ERROR: could not open file "base/1459687/1467687": Permission denied; State=42501; ErrorCode=0
at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:273)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
at sun.reflect.GeneratedMethodAccessor426.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.compiere.db.StatementProxy.invoke(StatementProxy.java:100)
at $Proxy67.executeQuery(Unknown Source)
at org.compiere.server.AcctProcessor.postSession(AcctProcessor.java:130)
at org.compiere.server.AcctProcessor.doWork(AcctProcessor.java:79)

at org.compiere.server.AdempiereServer.run(AdempiereServer.java:232)

The client and server logging the same issue. For clients, after restarting the application, the same process is successfully executing and there is no errors in the console.

The file base/1459687/1472150  is in the postgres folder. The pg_log folder in postgresql logging the same error as

GST ERROR:  current transaction is aborted, commands ignored until end of transaction block
GST STATEMENT:  SELECT Version FROM AD_System
GST LOG:  could not open file "base/1459687/1471980": sharing violation
GST DETAIL:  Continuing to retry for 30 seconds.

GST HINT:  You might have antivirus, backup, or similar software interfering with the database system.

Its Windows server 2008, and I disabled the antivirus(ESET Nod32) in the server. Postgres max_connections = 300. But the connection limit is not crossing during the time of this error. the client is using jnlp client installation. Any kind help is appreciated.