UCP-Failed to create initialPoolSize connections while starting a pool: java.lang.NullPointerException-

Question

PoolDataSource pds = PoolDataSourceFactory.getPoolDataSource();

    try {
        
        LOGGER.info("testing  Pool creation  ::::" );
        
        LOGGER.info("testing  Pool creation  ::::    in test" );
        if (StringUtils.isEmpty(poolname)) {
            throw new UCPConnectionException("Pool name derived from Sys-config was not valid...");
        }
        if (StringUtils.isEmpty(url)|| StringUtils.isEmpty(user) || StringUtils.isEmpty(pswd)) {
            throw new UCPConnectionException(
                    "Invalid Connection Parameters.Terminating the creation of Pool DataSource");
        }
        //String ONS_CONFIG = "nodes=hract21:6200,hract22:6200,hract23:6200";
        //pds.setONSConfiguration ( ONS_CONFIG);
        //pds.setFastConnectionFailoverEnabled( true);
        pds.setConnectionFactoryClassName(factoryName);
        pds.setURL(url);
        pds.setUser(user);
        pds.setPassword(DatabaseConnectionHelper.decryptPassword(pswd));
        pds.setConnectionPoolName(poolname);

        pds.setInitialPoolSize(50);
        // Default is 0. Set the minimum number of connections
        // that is maintained by UCP at runtime.
        pds.setMinPoolSize(50);

        // Default is Integer.MAX_VALUE (2147483647). Set the maximum number of
        // connections allowed on the connection pool.
        pds.setMaxPoolSize(200);

        // Default is 30secs. Set the frequency in seconds to enforce the timeout
        // properties. Applies to inactiveConnectionTimeout(int secs),
        // AbandonedConnectionTimeout(secs)& TimeToLiveConnectionTimeout(int secs).
        // Range of valid values is 0 to Integer.MAX_VALUE. .
        pds.setTimeoutCheckInterval(25);

        // Default is 0. Set the maximum time, in seconds, that a
        // connection remains available in the connection pool.
        pds.setInactiveConnectionTimeout(50);

        // Set the JDBC connection properties after pool has been created
        Properties connProps = new Properties();
        connProps.setProperty("fixedString", "false");
        connProps.setProperty("remarksReporting", "false");
        connProps.setProperty("restrictGetTables", "false");
        connProps.setProperty("includeSynonyms", "false");
        connProps.setProperty("defaultNChar", "false");
        connProps.setProperty("AccumulateBatchResult", "false");

        // JDBC connection properties will be set on the provided
        // connection factory.
        pds.setConnectionProperties(connProps);
        // hardcoded values end
        pds.setValidateConnectionOnBorrow(true);
        // pds.setConnectionProperties(connProps);
        LOGGER.info("Establishing Pool creation ::::::::::::::::::::::::::::::::::::: ::::" + poolname);
        UniversalConnectionPoolManagerImpl.getUniversalConnectionPoolManager()
                .createConnectionPool((UniversalConnectionPoolAdapter) pds);
        LOGGER.info("Starting Pool creation  ::::" + poolname);
        UniversalConnectionPoolManagerImpl.getUniversalConnectionPoolManager().startConnectionPool(poolname);

    } catch (Exception  ue) {
        ue.printStackTrace();
        LOGGER.error("Unable to create/Start the UCP connection pool due to " + ue.getMessage());
        throw new UniversalConnectionPoolException("Exception occured when trying to create the pool ");
    }
    return pds;

============================================

ERROR | Nov 24, 11:00:31] com.oracle.cegbu.microservice.sync.service.db.connection.ManageDBConnectionPool:121 - Unable to create/Start the UCP connection pool due to oracle.ucp.UniversalConnectionPoolException: Failed to create initialPoolSize connections while starting a pool: java.lang.NullPointerException at oracle.ucp.util.UCPErrorHandler.newUniversalConnectionPoolException(UCPErrorHandler.java:336) ~[oracle.ucp.jar:19.3.0.0.0] at oracle.ucp.util.UCPErrorHandler.throwUniversalConnectionPoolException(UCPErrorHandler.java:59) ~[oracle.ucp.jar:19.3.0.0.0] at oracle.ucp.common.Core.initialize(Core.java:1783) ~[oracle.ucp.jar:19.3.0.0.0] at oracle.ucp.common.UniversalConnectionPoolBase.start(UniversalConnectionPoolBase.java:705) ~[oracle.ucp.jar:19.3.0.0.0] at oracle.ucp.jdbc.oracle.OracleJDBCConnectionPool.start(OracleJDBCConnectionPool.java:129) ~[oracle.ucp.jar:19.3.0.0.0] at oracle.ucp.admin.UniversalConnectionPoolManagerBase.startConnectionPool(UniversalConnectionPoolManagerBase.java:363) ~[oracle.ucp.jar:19.3.0.0.0] at com.oracle.cegbu.microservice.sync.service.db.connection.ManageDBConnectionPool.createConnectionPool(ManageDBConnectionPool.java:118) [sync-client-service.jar:20.12.0.0] at com.oracle.cegbu.microservice.sync.service.akka.process.SyncProcessSingleton.createPools(SyncProcessSingleton.java:99) [sync-client-service.jar:20.12.0.0] at com.oracle.cegbu.microservice.sync.service.akka.process.SyncProcessSingleton.poolInitlize(SyncProcessSingleton.java:77) [sync-client-service.jar:20.12.0.0]