Logging in a plugin for Bitbucket server?

#1

I’m having trouble configuring a logger during plugin development for Bitbucket server.
I’m not getting any output to neither the console nor a file.

I have a src/aps/log4j.properties like below,

log4j.rootLogger=INFO, console, filelog

log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=ALL
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{HH:mm:ss} %5p [%t] - %m%n

log4j.appender.filelog=org.apache.log4j.RollingFileAppender
log4j.appender.filelog.layout=org.apache.log4j.PatternLayout
log4j.appender.filelog.layout.ConversionPattern=%d{HH:mm:ss} %5p [%t] - %m%n
log4j.appender.filelog.File=C:\\temp\info.log
log4j.appender.filelog.MaxFileSize=512KB
log4j.appender.filelog.MaxBackupIndex=3
# Plugin logging
log4j.logger.com.company.impl = DEBUG, console, filelog

and in the pom.xml (along with dependencies for both slf4j-api, slf4j-simple and log4j under project.build.plugins.plugin.configuation I have

<log4jProperties>src/aps/log4j.properties</log4jProperties>

And finally in my JavaClass I have sth like:

package com.company.impl;
public class myclass {
    private static final Logger log = LoggerFactory.getLogger(myclass.class);

    public myclass(){
        log.info("Constructed");
    }
}

It feels like I’m missing something incredibly basic, but I can’t put my finger on it and “Bitbucket log4j.properties” is not giving me anything onhere or Google.

Bitbucket-maven-plugin and files in /target/bitbucket/home
#2

Pretty sure bitbucket uses Logback, not log4j?

#3

That’s great! I’m not married to log4j.

How do I get logging with logback?

I tried adding the following to a src/main/resources/logback.xml:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36}
                %X{sourceThread} - %msg%n</Pattern>
        </layout>
    </appender>
    <appender name="filelog" class="ch.qos.logback.core.FileAppender">
        <file>C:/temp/log.log</file>
        <encoder>
            <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
        </encoder>
    </appender>
    <!-- default is DEBUG -->
    <root level="DEBUG">
        <appender-ref ref="console" />
        <appender-ref ref="filelog" />
    </root>
</configuration>

But to no avail :frowning_face:

#4

You can place log4j.properties files in src/main/resources folder and the below dependency

log4j log4j 1.2.17

in your pom.xml file. It worked for me.

#5

To enable debugging of your Bitbucket plugin using Logback:

  1. Create the directory src/test/resources/bitbucket-home
  2. Create a file src/test/resources/bitbucket-home/logback.xml [1] and add logger elements as desired, eg I have:
<included>
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>${log.format}</pattern>
        </encoder>
    </appender>
    <!--When starting up Elasticsearch in-process (for dev):
    We need to set the logging level of org.elasticsearch.bootstrap to ERROR because otherwise
    it will log a misleading warning (with a stacktrace) about JNA being unavailable.-->
    <logger name="org.elasticsearch.bootstrap" level="ERROR"/>
    <logger name="com.declarativesystems" level="DEBUG"/>

    <root>
        <appender-ref ref="console"/>
    </root>
</included>
  1. atlas-clean && atlas-run as normal - you will now be able to see the logs from your plugin on the console.

Log4J
I’m using Bitbucket 5.16 which uses Logback. I couldn’t get log4j working at all:

Log4j 1.2 in pom.xml causes my whole plugin to fail:

Caused by: org.osgi.framework.BundleException: Unresolved constraint in bundle com.declarativesystems.bitbucket.credentialscanner [126]: Unable to resolve 126.0: missing requirement [126.0] osgi.wiring.package; (osgi.wiring.package=com.ibm.uvm.tools)
        at org.apache.felix.framework.Felix.resolveBundleRevision(Felix.java:3974)
        ... 22 common frames omitted

Using the OSGi version

        <dependency>
            <groupId>org.apache.logging.log4j.osgi</groupId>
            <artifactId>log4j-core-osgi-reduced</artifactId>
            <scope>provided</scope>
            <version>2.0-rc1</version>
        </dependency>

Doesn’t break anything but doesn’t give any debug output either

HTH

[1] This is a homedir override, as discussed in https://ecosystem.atlassian.net/projects/AMPS/issues/AMPS-1505 … I would never have found this workaround without this ticket!