PredictionIO：在OSX上为PostgreSQL安装JDBC驱动程序

Question

I'm trying to follow the PredictionIO tutorial for a text classification enginge provided here. I'm using OSX and PredictionIO together with PostgreSQL.

When trying to import data into my naked App with the command

pio import --appid 1 --input data/stopwords.json

I get the following error:

Exception in thread "main" java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost/pio

So obviously the JDBC driver is missing or not linked appropriately. Here's where my trouble begins. Naively I downloaded the postgres jdbc driver from this source . I read that I need to add it to java's "CLASSPATH", so I tried this by adding

export CLASSPATH=$CLASSPATH:~/java-extensions/postgresql-9.4.1207.jre6.jar

to my bash configuration. Unfortunatly this does not work. A similar error situation is discussed here - but with my knowledge I'm not able to extract useful hints from it.

--

Version details:

psql (PostgreSQL) 9.4.5 installed via homebrew

OSX Yosemite

PredictionIO 0.9.5

pio status reports "Your system is all ready to go."

Answer 1

See this Google Group thread: https://groups.google.com/d/topic/predictionio-user/yJexMh5HpHc/discussion

tl;dr :

Fixed in next release of PredictionIO (v0.9.6), coming soon.

Workaround for earlier PIO versions :

pio train -- --driver-class-path WHEREVER/postgresql-9.4-1204-jdbc41.jar 

Answer 2

As alex9311 pointed out, the pio import nowadays accepts a flag to specify the driver location:

pio import --appid 1 --input data/stopwords.json --driver-class-path WHEREVER/postgresql-9.4-1204-jdbc41.jar 

See also this SO question