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https://issues.apache.org/jira/browse/OFBIZ-6858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312860#comment-16312860
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Shi Jinghai commented on OFBIZ-6858:
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I played this issue today.
OFBiz uses Log4J2 directly for logging, Solr uses SLF4J. According to the
document from SLF4J (https://www.slf4j.org/legacy.html), SLF4J can be bound to
Log4J. Log4J is end of life, Solr doesn't upgrade to Log4J2 until now (see
SOLR-7887 for details).
Here are the steps to make Solr log working in OFBiz trunk:
1. Comment out log4j-1.2-api and log4j-slf4j-impl in /build.gradle, as
delegating Solr' logging to Log4J2 wouldn't work.
{code:java}
// runtime 'org.apache.logging.log4j:log4j-1.2-api:2.10.0' // for external
jars using the old log4j1.2: routes logging to log4j 2
runtime 'org.apache.logging.log4j:log4j-core:2.10.0' // the implementation
of the log4j 2 API
runtime 'org.apache.logging.log4j:log4j-jul:2.10.0' // for external jars
using the java.util.logging: routes logging to log4j 2
// runtime 'org.apache.logging.log4j:log4j-slf4j-impl:2.10.0' // for
external jars using slf4j: routes logging to log4j 2
{code}
2. Add slf4j-api, slf4j-log4j12 and log4j in plugins/solr/build.gradle:
{code:java}
pluginLibsRuntime 'org.slf4j:slf4j-api:1.7.7'
pluginLibsRuntime 'org.slf4j:slf4j-log4j12:1.7.7'
pluginLibsRuntime 'log4j:log4j:1.2.17'
{code}
3. Add log4j.configuration to system properties in /build.gradle:
{code:java}
// java settings
def jvmArguments = ['-Xms128M', '-Xmx1024M',
'-Dlog4j.configuration=file:///D:/workspaces/OFBiz/ofbiz-framework-trunk/plugins/solr/config/log4j.properties']
{code}
4. Copy log4j.properties from Solr repository
(https://github.com/apache/lucene-solr/blob/releases/lucene-solr/7.1.0/solr/server/resources/log4j.properties),
change solr.log to runtime/logs/solr
{code:java}
# rootLogger log level may be programmatically overridden by -Dsolr.log.level
solr.log=runtime/logs/solr
log4j.rootLogger=INFO, file, CONSOLE
# Console appender will be programmatically disabled when Solr is started with
option -Dsolr.log.muteconsole
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.EnhancedPatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS}
%-5p (%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
#- size rotation with log cleanup.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.MaxFileSize=4MB
log4j.appender.file.MaxBackupIndex=9
#- File to log to and log format
log4j.appender.file.File=${solr.log}/solr.log
log4j.appender.file.layout=org.apache.log4j.EnhancedPatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss.SSS} %-5p
(%t) [%X{collection} %X{shard} %X{replica} %X{core}] %c{1.} %m%n
# Adjust logging levels that should differ from root logger
log4j.logger.org.apache.zookeeper=WARN
log4j.logger.org.apache.hadoop=WARN
log4j.logger.org.eclipse.jetty=WARN
log4j.logger.org.eclipse.jetty.server.Server=INFO
log4j.logger.org.eclipse.jetty.server.ServerConnector=INFO
# set to INFO to enable infostream log messages
log4j.logger.org.apache.solr.update.LoggingInfoStream=OFF
{code}
5. Start OFBiz
6. Visit https://localhost:8443/solr/#/~logging and
https://localhost:8443/solr/#/~logging/level works as expected.
> Solr logging doesn't work
> -------------------------
>
> Key: OFBIZ-6858
> URL: https://issues.apache.org/jira/browse/OFBIZ-6858
> Project: OFBiz
> Issue Type: Bug
> Components: solr
> Affects Versions: Trunk, Release Branch 15.12
> Reporter: Pierre Smits
> Assignee: Shi Jinghai
> Attachments: Image2.png
>
>
> When looking at the logging screen in demo-trunk
> (https://demo-trunk-ofbiz.apache.org/solr/#/~logging) no logging results are
> shown. Nor does https://demo-trunk-ofbiz.apache.org/solr/#/~logging/level
> provide any insights.
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