Sonarqube report a memory leak issue web log

after unzipping my sonarqube
i install jdk 11
then i start the sonar qube as follows
sh sonar.sh
but it was not started, after going through the logs found this issue

`2021.03.01 10:05:52 WARN  web[][o.a.c.l.WebappClassLoaderBase] The web application [ROOT] appears to have started a thread named [SQ starter] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:\n java.base@11.0.11-ea/java.io.RandomAccessFile.readBytes(Native Method)\n java.base@11.0.11-ea/java.io.RandomAccessFile.read(RandomAccessFile.java:406)\n java.base@11.0.11-ea/java.io.RandomAccessFile.readFully(RandomAccessFile.java:470)\n java.base@11.0.11-ea/java.util.zip.ZipFile$Source.readFullyAt(ZipFile.java:1318)\n java.base@11.0.11-ea/java.util.zip.ZipFile$ZipFileInputStream.initDataOffset(ZipFile.java:1003)\n java.base@11.0.11-ea/java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java:1018)\n java.base@11.0.11-ea/java.util.zip.ZipFile$ZipFileInflaterInputStream.fill(ZipFile.java:468)\n java.base@11.0.11-ea/java.util.zip.InflaterInputStream.read(InflaterInputStream.java:159)\n java.base@11.0.11-ea/jdk.internal.loader.Resource.getBytes(Resource.java:124)\n java.base@11.0.11-ea/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:797)\n java.base@11.0.11-ea/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:698)\n java.base@11.0.11-ea/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:621)\n java.base@11.0.11-ea/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:579)\n java.base@11.0.11-ea/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)\n java.base@11.0.11-ea/java.lang.ClassLoader.loadClass(ClassLoader.java:522)\n app//org.sonar.server.platform.platformlevel.PlatformLevel4.configureLevel(PlatformLevel4.java:426)\n app//org.sonar.server.platform.platformlevel.PlatformLevel.configure(PlatformLevel.java:74)\n app//org.sonar.server.platform.PlatformImpl.start(PlatformImpl.java:210)\n app//org.sonar.server.platform.PlatformImpl.startLevel34Containers(PlatformImpl.java:187)\n app//org.sonar.server.platform.PlatformImpl.access$500(PlatformImpl.java:46)\n app//org.sonar.server.platform.PlatformImpl$1.lambda$doRun$0(PlatformImpl.java:120)\n app//org.sonar.server.platform.PlatformImpl$1$$Lambda$605/0x000000084049ac40.run(Unknown Source)\n app//org.sonar.server.platform.PlatformImpl$AutoStarterRunnable.runIfNotAborted(PlatformImpl.java:370)\n app//org.sonar.server.platform.PlatformImpl$1.doRun(PlatformImpl.java:120)\n app//org.sonar.server.platform.PlatformImpl$AutoStarterRunnable.run(PlatformImpl.java:354)\n java.base@11.0.11-ea/java.lang.Thread.run(Thread.java:829)`

help me how to install sonarqube in my ubuntu 16/04

Hello @Thavarajan_smi and welcome to the community :wave:

this looks like sonarqube crashed and could not clean up all started threads/processes. while this is bad as in your sonarqube instance crashed, the memory leak will be cleaned up by the linux kernel.
for further debugging, could you please post all the logs (located in $SONARQUBE_HOME/logs)?

EDIT: also please note that ubuntu 16.04 will be EOL soon