Sonarqube-7.9.1 HeapDumpOnOutOfMemoryError - sonarqube

Question

I installed sonarqube-7.9.1 on my Ubuntu 18.04 machine. JAVA 11 is installed and Mysql used as database.
Some important rows from sonar.properties are as follows
sonar.web.javaOpts=-Xmx1024m -Xms1024m -XX:+HeapDumpOnOutOfMemoryError
sonar.web.host=127.0.0.1
sonar.ce.javaOpts=-Xmx1024m -Xms1024m -XX:+HeapDumpOnOutOfMemoryError
Sonarqube log file shows following lines
Launching a JVM...
Wrapper (Version 3.2.3) http://wrapper.tanukisoftware.org
Copyright 1999-2006 Tanuki Software, Inc. All Rights Reserved.
2019.10.17 12:36:49 INFO app[][o.s.a.AppFileSystem] Cleaning or creating temp directory /opt/sonarqube/sonarqube-7.9.1/temp
2019.10.17 12:36:49 INFO app[][o.s.a.es.EsSettings] Elasticsearch listening on /127.0.0.1:9001
2019.10.17 12:36:49 INFO app[][o.s.a.ProcessLauncherImpl] Launch process[[key='es', ipcIndex=1, logFilenamePrefix=es]] from [/opt/sonarqube/sonarqube-7.9.1/elasticsearch]: /opt/sonarqube/sonarqube-7.9.1/elasticsearch/bin/elasticsearch
2019.10.17 12:36:49 INFO app[][o.s.a.SchedulerImpl] Waiting for Elasticsearch to be up and running
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
2019.10.17 12:36:49 INFO app[][o.e.p.PluginsService] no modules loaded
2019.10.17 12:36:49 INFO app[][o.e.p.PluginsService] loaded plugin [org.elasticsearch.transport.Netty4Plugin]
2019.10.17 12:37:01 INFO app[][o.s.a.SchedulerImpl] Process[es] is up
2019.10.17 12:37:01 INFO app[][o.s.a.ProcessLauncherImpl] Launch process[[key='web', ipcIndex=2, logFilenamePrefix=web]] from [/opt/sonarqube/sonarqube-7.9.1]: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djava.io.tmpdir=/opt/sonarqube/sonarqube-7.9.1/temp --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED -Xmx1024m -Xms1024m -XX:+HeapDumpOnOutOfMemoryError -Dhttp.nonProxyHosts=localhost|127.*|[::1] -cp ./lib/common/*:/opt/sonarqube/sonarqube-7.9.1/lib/jdbc/mysql/mysql-connector-java-5.1.46.jar org.sonar.server.app.WebServer /opt/sonarqube/sonarqube-7.9.1/temp/sq-process4977560398960418438properties
2019.10.17 12:37:04 INFO app[][o.s.a.SchedulerImpl] Process[web] is stopped
2019.10.17 12:37:05 WARN app[][o.s.a.p.AbstractManagedProcess] Process exited with exit value [es]: 143
2019.10.17 12:37:05 INFO app[][o.s.a.SchedulerImpl] Process[es] is stopped
2019.10.17 12:37:05 INFO app[][o.s.a.SchedulerImpl] SonarQube is stopped
<-- Wrapper Stopped

Answer 1

I was also getting the same issue of starting Sonarqube-7.9.1 with OpenJDK-11 because of the port conflicts. I tried changing port numbers and issue got resolved. Try replacing below lines in sonar.properties:
sonar.web.port=9004
sonar.search.port=9005
we can replace below lines also,already given in this question at the start [For me it worked without replacing below lines]:
sonar.web.javaOpts=-Xmx1024m -Xms1024m -XX:+HeapDumpOnOutOfMemoryError
sonar.ce.javaOpts=-Xmx1024m -Xms1024m -XX:+HeapDumpOnOutOfMemoryError

Answer 2

I believe SonarQube is not starting for any reason related to memory but rather from the fact that you attempt to connect to MySQL Database and this DB is not supported anymore (see "Release 7.9 LTS Upgrade Notes" at https://docs.sonarqube.org/latest/setup/upgrade-notes/).
Have a look at web.log (see "Checking the logs" at https://docs.sonarqube.org/latest/setup/troubleshooting/) to confirm it, you will find a clear message there.