Scala : trying to get log4j working

Question

Scala newb here (it's my 2nd day of using it). I want to get log4j logging working in my Scala script. The script and the results are below, any ideas as to what's going wrong?

[sean@ibmp2 pybackup]$ cat backup.scala
import org.apache.log4j._

val log = LogFactory.getLog()

log.info("started backup")
[sean@ibmp2 pybackup]$ scala -cp log4j-1.2.16.jar:. backup.scala
/home/sean/projects/personal/pybackup/backup.scala:1: error: value apache is not a member of package org
import org.apache.log4j._
           ^
one error found

The punctuation at the end the jar file name could be the problem. — Knut Arne Vedaa, Jan 09 '11 at 22:50

andy legkiy · Answer 1 · 2011-01-12T15:46:17.907

2

I reproduce it under Windows: delimiter of '-classpath' must be ';' there (not ':'). Are you use cygwin or some sort of unix emulator?

But Scala script works anywhere without current dir in classpath. Try to use:

$ scala -cp log4j-1.2.16.jar backup.scala

JFI: LogFactory is a class of slf4j library (not log4j).

UPDATE

Another possible case: broken jar in classpath, maybe during download or something else. Scala interpreter does report only about unavailable member of the package.

$ echo "qwerty" > example.jar
$ scala -cp example.jar backup.scala
backup.scala:1: error: value apache is not a member of package org
...

Need to inspect content of the jar-file:

$ jar -tf log4j-1.2.16.jar
...
org/apache/log4j/Appender.class
...

edited Jan 12 '11 at 15:46

answered Jan 09 '11 at 23:09

andy legkiy

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The problem is happening on Centos Linux – fred basset Jan 10 '11 at 03:33
@Fred Scala from system rpm package or custom installation at the HOME dir? – andy legkiy Jan 10 '11 at 13:46
I downloaded the latest scala version and installed it under /usr/local – fred basset Jan 10 '11 at 18:08

score 1 · Answer 2 · answered Jan 09 '11 at 21:23

1

Did you remember to put log4j.jar in your classpath?

answered Jan 09 '11 at 21:23

Ken Bloom

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I have the log4j jar file in the same directory as my .scala source, and I tried running scala with -cp log4j-x.x.jar as an argument, didn't seem to make any difference – fred basset Jan 09 '11 at 21:25

score 0 · Answer 3 · answered May 09 '11 at 05:30

0

Had Similar issue when started doing Scala Development using Eclipse, doing a clean build solved the problem.

Guess the Scala tools are not matured et.

answered May 09 '11 at 05:30

mailboat

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score -1 · Answer 4 · answered Jan 10 '11 at 20:19

-1

Instead of using log4j directly, you might try using Configgy. It's the Scala Way™ to work with log4j, as well as configuration files. It also plays nicely with SBT and Maven.

answered Jan 10 '11 at 20:19

Jeremy

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score -1 · Answer 5 · edited May 23 '17 at 12:07

-1

I asked and answered this question myself, have a look:

Put it under src/main/resources/logback.xml. It will be copied to the right location when SBT is doing the artifact assembly.

edited May 23 '17 at 12:07

Community

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answered Mar 08 '11 at 04:09

jpswain

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Scala : trying to get log4j working

5 Answers5