dsmiley commented on a change in pull request #1972:
URL: https://github.com/apache/lucene-solr/pull/1972#discussion_r523776751



##########
File path: gradle/solr/packaging.gradle
##########
@@ -76,7 +76,8 @@ configure(allprojects.findAll {project -> 
project.path.startsWith(":solr:contrib
             return true
           }
         }
-        return externalLibs - configurations.solrPlatformLibs
+        // libExt has logging libs, which we don't want.  Lets users decide 
what they want.
+        return externalLibs - configurations.solrPlatformLibs - 
project(':solr:server').configurations.getByName('libExt')

Review comment:
       It might be considered hacky to reference a configuration of a specific 
sub-project.  Maybe libExt could be declared more top-level and be called 
"loggingLibs" or something.

##########
File path: solr/contrib/prometheus-exporter/bin/solr-exporter
##########
@@ -123,8 +111,6 @@ else
     GC_TUNE="$GC_TUNE"
 fi
 
-EXTRA_JVM_ARGUMENTS="-Dlog4j.configurationFile=file:"$BASEDIR"/../../server/resources/log4j2-console.xml"

Review comment:
       Instead, /conf is put on the classpath, and thus "log4j2.xml" is loaded 
automatically based on Log4j2's automatic resolution.

##########
File path: solr/contrib/prometheus-exporter/build.gradle
##########
@@ -31,17 +30,57 @@ dependencies {
     exclude group: "org.jruby.joni", module: "joni"
   })
   implementation ('net.sourceforge.argparse4j:argparse4j')
+  implementation ('com.github.ben-manes.caffeine:caffeine', {
+    exclude group: "org.checkerframework", module: "checker-qual"
+    exclude group: "com.google.errorprone", module: "error_prone_annotations"
+  })
 
-  testImplementation ('org.apache.httpcomponents:httpcore')
-  testImplementation ('org.eclipse.jetty:jetty-servlet')
+  runtimeOnly 'org.apache.logging.log4j:log4j-api'

Review comment:
       Logging dependencies in Java is a pain.  In a separate issue/PR, we 
should explore this approach: 
https://blog.gradle.org/addressing-logging-complexity-capabilities

##########
File path: 
solr/contrib/prometheus-exporter/src/java/org/apache/solr/prometheus/exporter/SolrExporter.java
##########
@@ -68,7 +66,7 @@
   private static final String[] ARG_CONFIG_FLAGS = {"-f", "--config-file"};
   private static final String ARG_CONFIG_METAVAR = "CONFIG";
   private static final String ARG_CONFIG_DEST = "configFile";
-  private static final String ARG_CONFIG_DEFAULT = "solr-exporter-config.xml";
+  private static final String ARG_CONFIG_DEFAULT = 
"conf/solr-exporter-config.xml";

Review comment:
       @HoustonPutman you removed the conf/ and I'm putting it back.  I'm not 
sure why it worked with it gone.  It may be related to other changes in this PR 
that it's needed again.  I tested that this works here both with `gw run` and 
via executing normally from the built assembly.  I didn't test Docker yet.




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