How to configure logback.xml for JAR application?

Question

I am writing Scala application using logback for logging. I want to configure logback so that when I run my application JAR file I can get a log file. This is my current configuration, which cannot produce any log file

<configuration>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <!-- path to your log file, where you want to store logs -->
        <file>./log/test.log</file>
        <append>false</append>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <root level="info">
        <appender-ref ref="STDOUT" />
        <appender-ref ref="FILE" />
    </root>
</configuration>

Here is my build sbt:

name := "distributed-sorting"

version := "1.0"

scalaVersion := "2.11.8"

libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test"

libraryDependencies ++= Seq(
  "junit" % "junit" % "4.8.1" % "test"
)
libraryDependencies += "ch.qos.logback" % "logback-classic" % "1.1.7"
libraryDependencies += "com.typesafe.scala-logging" %% "scala-logging" % "3.5.0"
libraryDependencies += "com.lihaoyi" %% "upickle" % "0.4.3"

Thank you

Use the Standard Out printout to find out what your path for the executable is. Most likely the log file **is** being created, but in a folder you do not expect. — MichaelK, Nov 28 '16 at 12:44
try set absolute path :/log/test.log. And run again and check? — Dai Kaixian, Nov 28 '16 at 12:48
@Berger: Oh, I put it on resources dir when I code, but running application I do not attach my logback.xml to classpath. Is that the problem — hminle, Nov 28 '16 at 12:51
@MichaelKarnerfors: I use `scala -classpath ... ` to run the application, so where should the log file is created? — hminle, Nov 28 '16 at 12:52
Did you create a maven project？I think it may has nothing with scala. — Dai Kaixian, Nov 28 '16 at 12:58
http://stackoverflow.com/questions/29065603/complete-scala-logging-example this may help — Dai Kaixian, Nov 28 '16 at 13:01
@DaiKaixian: Hi, this is my build sbt: `name := "distributed-sorting" version := "1.0" scalaVersion := "2.11.8" //libraryDependencies += "org.scala-lang.modules" %% "scala-pickling" % "0.10.1" libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.0" % "test" libraryDependencies ++= Seq( "junit" % "junit" % "4.8.1" % "test" ) libraryDependencies += "ch.qos.logback" % "logback-classic" % "1.1.7" libraryDependencies += "com.typesafe.scala-logging" %% "scala-logging" % "3.5.0" libraryDependencies += "com.lihaoyi" %% "upickle" % "0.4.3"` — hminle, Nov 28 '16 at 13:04
So difficult to read. Please update your question and add the build.sbt — Dai Kaixian, Nov 28 '16 at 13:06
Did you try this answer ? http://stackoverflow.com/a/32003907/6037575 — Dai Kaixian, Nov 28 '16 at 13:11
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/129242/discussion-between-dai-kaixian-and-hminle). — Dai Kaixian, Nov 28 '16 at 13:16
@JavaNoob you'd better not use relative path https://dzone.com/articles/do-not-use-relative-path — Dai Kaixian, Dec 09 '16 at 06:51

score 2 · Accepted Answer · answered Feb 22 '18 at 06:50

Check if the log configuration file is in main/src/resources and named logback.xml This is the default path.

If the logback.xml is placed elsewhere, give the path in build.sbt file as:

resourceDirectory in Compile := baseDirectory.value / "yourFilePath"

When you run sbt run, check if the xx.xml file present in target/scala.XX/classes folder.

Use sbt assembly plugin or package to build your jar and execute

java -Dlogback.configurationFile=xx.xml -Dfile.ending=UTF8  -cp $SCALA_HOME/lib/scala-library.jar  -jar myProject.jar -Dconfig.file=application.conf

How to configure logback.xml for JAR application?

1 Answers1