logback / LOGBACK-1589 [Open] Could not find my custom class when used in scala play framework ============================== Here's what changed in this issue in the last few minutes. This issue has been created This issue is now assigned to you. View or comment on issue using this link https://jira.qos.ch/browse/LOGBACK-1589 ============================== Issue created ------------------------------ Devendra Vishwakarma created this issue on 18/Nov/21 12:40 PM Summary: Could not find my custom class when used in scala play framework Issue Type: Bug Assignee: Logback dev list Components: logback-classic Created: 18/Nov/21 12:40 PM Environment: Scala version - 2.13.4 Scala play - 2.8.8 Java - Openjdk 1.8 Environment - local development Labels: configuration logging Priority: Critical Reporter: Devendra Vishwakarma Description: This is getting very frustrating to me to make logback work if I use my own custom class anywhere with in conversionRule or in appender. Because logback never finds those classes when running my scala play app in local mode by either running via IntelliJ or sbt run.  I have read all over internet, they all blame logback because it internally uses some different classloader and does not find any other classes if they are not packaged in jar file.  Error I get -  {code:java} 11:32:39,796 |-ERROR in ch.qos.logback.core.pattern.parser.Compiler@4fa3c3b - Failed to instantiate converter class [utils.LoggingPasswordMask] for keyword [msgNoPW] ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type utils.LoggingPasswordMask at ch.qos.logback.core.util.DynamicClassLoadingException: Failed to instantiate type utils.LoggingPasswordMask Caused by: java.lang.ClassNotFoundException: utils.LoggingPasswordMask at at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at at java.lang.ClassLoader.loadClass(ClassLoader.java:418) at at java.lang.ClassLoader.loadClass(ClassLoader.java:351) at at ch.qos.logback.core.util.OptionHelper.instantiateByClassNameAndParameter(OptionHelper.java:56) at ... 51 common frames omitted 11:32:39,796 |-ERROR in ch.qos.logback.core.pattern.parser.Compiler@4fa3c3b - [msgNoPW] is not a valid conversion word {code} And this is my logback.xml - Note that I am using my own class called utils.LoggingPasswordMask in converionRule {code:java} <configuration> <property name="LOG_PATH" value="${LOG_PATH:-logs}"/> <property name="MODULE_NAME" value="nhp"/> <conversionRule conversionWord="coloredLevel" converterClass="play.api.libs.logback.ColoredLevel"/> <conversionRule conversionWord="msgNoPW" converterClass="utils.LoggingPasswordMask" /> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>[%date] %highlight([%level]) [%logger %file:%line] %msgNoPW%n</pattern> </encoder> </appender> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <Append>true</Append> <File>${LOG_PATH}/${MODULE_NAME}_play.log</File> <encoder> <pattern>%date %-5level - %logger - %msgNoPW%n%xException</pattern> <charset>utf8</charset> </encoder> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${LOG_PATH}/${MODULE_NAME}_play-%d{yyyy-MM-dd}.log.gz</fileNamePattern> <maxHistory>30</maxHistory> <totalSizeCap>1GB</totalSizeCap> </rollingPolicy> </appender> <appender name="FILE_USE_CASE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <Append>true</Append> <File>${LOG_PATH}/${MODULE_NAME}_use_case.log</File> <encoder> <pattern>%date %-5level - %msgNoPW%n%xException</pattern> <charset>utf8</charset> </encoder> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>${LOG_PATH}/${MODULE_NAME}_use_case-%d{yyyy-MM-dd}.log.gz</fileNamePattern> <maxHistory>30</maxHistory> <totalSizeCap>1GB</totalSizeCap> </rollingPolicy> </appender> <root level="INFO"> <appender-ref ref="FILE"/> </root> <logger name="BatchUseCaseProcessLogger" level="INFO" additivity="false"> <appender-ref ref="FILE_USE_CASE"/> </logger> <logger name="play" level="INFO" /> <logger name="application" level="DEBUG" /> <logger name="slick.jdbc.JdbcBackend.statement" level="DEBUG" /> <logger name="akka.persistence" level="DEBUG" /> <logger name="org.quartz" level="DEBUG" /> <root level="INFO"> <appender-ref ref="STDOUT" /> </root> </configuration> {code} ============================== This message was sent by Atlassian Jira (v8.8.0#808000-sha1:e2c7e59)