How to solve error: the parameter is null: _companyLogRoutingFilePatterns

Issue

Trying to migrate from 7.4 to Q3, you could observe that in catalina.out file there are some errors such as the following:

2023-11-17 09:54:43,839 main ERROR The parameter is null: _companyLogRoutingFilePatterns
2023-11-17 09:54:43,840 main ERROR The parameter is null: _dirPattern
2023-11-17 09:54:43,842 main ERROR Could not create plugin of type class com.liferay.portal.log4j.internal.CompanyLogRoutingAppender for element CompanyLogRouting org.apache.logging.log4j.core.config.ConfigurationException: Arguments given for element CompanyLogRouting are invalid: field '_companyLogRoutingFilePatterns' has invalid value '[Lcom.liferay.portal.log4j.internal.CompanyLogRoutingFilePattern;@69ec93c2', field '_dirPattern' has invalid value 'null'

Environment

DXP 7.4
2023.Q3

Resolution

First, try to remove the portal-log4j-ext.xml, if the error disappears, try next steps.
A change was made in U-66 on LPS-175340 and you have to adapt your file to reflect this change.
- You have to delete the line <Layout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}{Europe/Madrid} %-5p [%t][%c{1}:%L] %m%n" type="PatternLayout" /> and replace it with the correct values
- ```
<FilePattern fileNamePattern="liferay-@company.id@.%d{yyyy-MM-dd}.log">
<Layout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS}{Europe/Madrid} %-5p [%t][%c{1}:%L] %m%n" type="PatternLayout" />
</FilePattern>
```
In addition to this, the filePattern attribute of the <Appender filePattern="/SRV/LOGS/liferay/liferay.%d{yyyy-MM-dd}.log" ... is changed to dirPattern <Appender dirPattern="@liferay.home@/logs/companies/@company.id@" ...