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log4jとはJava用のloggingライブラリだ。loggingライブラリというのはログとして記録すべき文字列を受け取り、それをどこかに出力するものだ。文字列の中身を通常のloggingライブラリは気にしない。 log4jが通常のloggingライブラリと違うのは、文字列の中身を見て、一部の文字列を変数とみなして置換することだ。これはlog4jのドキュメントではlookupと呼ばれている。 Log4j – Log4j 2 Lookups 例えばプログラムを実行中のJava runtimeのバージョンをログに含めたい場合は、"Java Runtime: ${java:runtime}"などとすると、"Java Runtgime: Java(TM) SE Runtime Environment (build 1.7.0_67-b01) from Oracle Corporation"などの
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[default-tests-sbt] $ /usr/lib/jvm/java-8-oracle/bin/java -Dsbt.log.noformat=true -Xmx2G -jar /var/lib/jenkins/tools/org.jvnet.hudson.plugins.SbtPluginBuilder_SbtInstallation/SBT_default_launcher/bin/sbt-launch.jar clean test:clean buildUmp test [info] Loading project definition from /var/lib/jenkins/workspace/default-tests-sbt/project [info] Set current project to ump (in build file:/var/lib/jenk
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