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Errors in the log file of the type "Redirect URL is not allowed" and seemingly unrelated symptoms
legacy Troubleshooting
Issue There are traces in Liferay's logs resembling this: 2019-08-27 08:46:42.641 WARN [http-nio-8080-exec-4][PortalImpl:1003] Redirect URL .... is not allowed Additionally, some other issues appear at the same time:...
EXT Plugin not deploying
legacy Troubleshooting
Issue EXT Plugin not deploying correctly through the methods presented in the documentation: Deploying an Ext Plugin Environment Liferay DXP 7.1 Resolution Deploy the EXT Plugin to marketplace/override folder...
"Too Many Open Files" error in log
legacy Troubleshooting
Issue "Too Many Open Files" error is reported in the log. For example: 2019-05-06 09:41:20,142 SEVERE [org.apache.tomcat.util.net.NioEndpoint] Socket accept failed java.io.IOException: Too many open files at...
How to programmatically undeploy a module in DXP 7.1?
legacy How To
Issue I want to undeploy a module from my code, usig API I tried using DeployManagerUtil.undeploy(context), but nothing happens Environment Liferay DXP 7.1 Resolution If you are trying to undeploy a module by its context...
Child pages not displayed in Navigation Menu after upgrading to Liferay 7.2
legacy Troubleshooting
Issue After upgrading the portal to Liferay DXP 7.2, the child pages which were present in Liferay Portal 6.2 go missing from the Navigation menu in DXP 7.2. But, the child pages are present in Site Builder....
Error java.lang.OutOfMemoryError: Metaspace
legacy Troubleshooting
Issue When there's a lot of traffic or usage, the logs show an error similar to: 2019-11-12 07:39:54.538 ERROR [liferay/scheduler_dispatch-24][ParallelDestination:55] Unable to process message...
java.sql.SQLException: Incorrect string value and no Display Templates listed for the Breadcrumb widget
legacy Troubleshooting
Issue On startup, the server will print errors similar to these: ERROR [main][JDBCExceptionReporter:234] Incorrect string value: '\xE5\x9F\xBA\xE6\x9C\xAC...' for column 'name' at row 1 WARN...
Reference tag in service builder service.xml is not allowing to have MBMessage reference
legacy Troubleshooting
Issue Creating service module with reference <reference entity="MBMessage" package-path="com.liferay.message.boards" /> in service.xml. gradle buildService fails with  Exception in thread "main"...