I want to upload a file in PostgreSQL using Tomcat:
@Resource(name = "jdbc/DefaultDB")
private DataSource ds;
Connection conn = ds.getConnection();
I tried to cast the conn object this way:
PGConnection pgCon = ((org.apache.commons.dbcp.DelegatingConnection)
conn).getInnermostDelegate();
I get
Caused by: java.lang.ClassCastException:
org.apache.tomcat.dbcp.dbcp2.PoolingDataSource$PoolGuardConnectionWrapper
cannot be cast to org.postgresql.PGConnection
I also tried:
Connection unwrap = conn.unwrap(Connection.class);
connSec = (org.postgresql.PGConnection) unwrap;
I get
java.sql.SQLException: Cannot unwrap to org.postgresql.PGConnection
LargeObjectManager pgCon = pgCon.getLargeObjectAPI();
What is the proper way to implement the code?
P.S
I tried this:
PGConnection pgConnection = null;
if (conn.isWrapperFor(PGConnection.class))
{
pgConnection = conn.unwrap(PGConnection.class);
}
LargeObjectManager lobj = pgConnection.getLargeObjectAPI();
But I get NPE at this line LargeObjectManager lobj =
pgConnection.getLargeObjectAPI();
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