Fix and update logging setup (#129)

- Set up logging to file for testing (log/oersi-etl.log)
- Downgrade metafacture-core dependencies to 5.3.0-rc2
(which works around logging-related issues with a third-party lib,
see metafacture/metafacture-core#360)
- Update slf4j and log4j dependencies to current releases

build.gradle

@@ -30,31 +30,31 @@ dependencies {
     // This dependency is used internally, and not exposed to consumers on their own compile classpath.
     implementation 'com.google.guava:guava:26.0-jre'
     implementation 'org.jooq:joox-java-6:1.6.0'
-    implementation 'org.metafacture:metafacture-io:5.3.1'
-    implementation 'org.metafacture:metafacture-plumbing:5.3.1'
-    implementation 'org.metafacture:metafacture-strings:5.3.1'
-    implementation 'org.metafacture:metafacture-triples:5.3.1'
-    implementation 'org.metafacture:metafacture-formatting:5.3.1'
-    implementation 'org.metafacture:metafacture-monitoring:5.3.1'
-    implementation ('org.metafacture:metafacture-runner:5.3.1'){
+    implementation 'org.metafacture:metafacture-io:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-plumbing:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-strings:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-triples:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-formatting:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-monitoring:5.3.0-rc2'
+    implementation ('org.metafacture:metafacture-runner:5.3.0-rc2'){
         exclude group: 'org.antlr', module: 'antlr'
     }
-    implementation 'org.metafacture:metafacture-json:5.3.1'
-    implementation 'org.metafacture:metafacture-html:5.3.1'
-    implementation 'org.metafacture:metafacture-elasticsearch:5.3.1'
-    implementation 'org.metafacture:metafacture-xml:5.3.1'
+    implementation 'org.metafacture:metafacture-json:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-html:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-elasticsearch:5.3.0-rc2'
+    implementation 'org.metafacture:metafacture-xml:5.3.0-rc2'
     implementation 'org.metafacture:metafacture-fix:0.2.0-rc2'
     implementation 'org.metafacture:metafix:0.2.0-rc7'
-    implementation('org.metafacture:metafacture-biblio:5.3.1') {
+    implementation('org.metafacture:metafacture-biblio:5.3.0-rc2') {
         exclude group: 'xml-apis', module: 'xml-apis'
     }
     // Required after upgrade to Gradle 7.2 in metafacture-fix:
     // (TODO: avoid RecognitionException/Flux.main in ETL.java)
     implementation "org.antlr:antlr-runtime:3.2"
     implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.10.4'
     implementation 'com.github.java-json-tools:json-schema-validator:2.2.14'
-    implementation 'org.slf4j:slf4j-api:1.7.30'
-    implementation 'org.apache.logging.log4j:log4j-core:2.16.0'
+    implementation 'org.slf4j:slf4j-api:1.7.32'
+    implementation 'org.apache.logging.log4j:log4j-core:2.17.0'
     implementation 'org.apache.commons:commons-text:1.9'
 
     // Test frameworks:

src/main/resources/log4j.properties

@@ -1,10 +1,14 @@
 # Set root logger to INFO or DEBUG to see detailed output from Metafacture etc.
-log4j.rootLogger=WARN, stdout
+log4j.rootLogger=WARN, stdout, file
 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.file=org.apache.log4j.RollingFileAppender
+log4j.appender.file.File=log/oersi-etl.log
 
 # Set oersi logger to DEBUG or TRACE to see detailed output from the ETL processes
 log4j.logger.oersi=INFO
 
 # The format of log messages:
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
-log4j.appender.stdout.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c{1}:%L] %m%n
+log4j.appender.stdout.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c{1}:%L] %m%n
+log4j.appender.file.layout=org.apache.log4j.PatternLayout
+log4j.appender.file.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] [%c{1}:%L] %m%n