Bitbucket fails to start due to SpringMVC dispatcher [springMvc] could not be started

good day : i have installed bitbuckect and now it fails to start with the following message
A fatal error has occurred
The following problem occurred, which prevents Atlassian Bitbucket from starting:
SpringMVC dispatcher [springMvc] could not be started
on the GUI. the logs shows the following
2019-11-29 13:45:57,041 ERROR [main] o.apache.catalina.util.LifecycleBase Failed to start component [Connector[HTTP/1.1-7990]]
org.apache.catalina.LifecycleException: Protocol handler start failed
at org.apache.catalina.connector.Connector.startInternal(Connector.java:1008)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.addPreviouslyRemovedConnectors(TomcatWebServer.java:259)
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.start(TomcatWebServer.java:197)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.startWebServer(ServletWebServerApplicationContext.java:311)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.finishRefresh(ServletWebServerApplicationContext.java:164)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:552)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
at com.atlassian.bitbucket.internal.boot.BitbucketServerApplication.start(BitbucketServerApplication.java:247)
at com.atlassian.bitbucket.internal.boot.BitbucketServerApplication.main(BitbucketServerApplication.java:82)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at com.atlassian.bitbucket.internal.launcher.BitbucketServerLauncher.start(BitbucketServerLauncher.java:151)
at com.atlassian.bitbucket.internal.launcher.BitbucketServerLauncher.main(BitbucketServerLauncher.java:99)
… 6 frames trimmed
Caused by: java.net.BindException: Address already in use
at sun.nio.ch.Net.bind0(Native Method)
at sun.nio.ch.Net.bind(Net.java:433)
at sun.nio.ch.Net.bind(Net.java:425)
at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
… 16 common frames omitted
2019-11-29 13:45:57,677 ERROR [spring-startup] c.a.j.s.w.s.JohnsonDispatcherServlet SpringMVC dispatcher [springMvc] could not be started
org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [/opt/bitbucket/atlassian/bitbucket/6.4.0/app/WEB-INF/classes/com/atlassian/stash/internal/config/OsgiComponentsWiring.class]; nested exception is java.nio.channels.ClosedByInterruptException
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:454)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:316)
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:275)
at org.springframework.context.annotation.ComponentScanBeanDefinitionParser.parse(ComponentScanBeanDefinitionParser.java:90)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:133)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:636)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:521)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at java.lang.Thread.run(Thread.java:748)
… 21 frames trimmed
Caused by: java.nio.channels.ClosedByInterruptException: null
at java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:202)
at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:164)
at sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:65)
at sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:109)
at sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:103)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:286)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at org.springframework.asm.ClassReader.readStream(ClassReader.java:306)
at org.springframework.asm.ClassReader.(ClassReader.java:273)
at org.springframework.core.type.classreading.SimpleMetadataReader.(SimpleMetadataReader.java:54)
at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103)
at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:123)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:430)
… 11 common frames omitted
2019-11-29 13:45:57,798 ERROR [main] o.s.b.d.LoggingFailureAnalysisReporter


APPLICATION FAILED TO START


Description:

The Tomcat connector configured to listen on port 7990 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector’s configuration, identify and stop any process that’s listening on port 7990, or configure this application to listen on another port.

2019-11-29 13:45:57,801 INFO [main] c.a.b.i.boot.log.BuildInfoLogger Bitbucket 6.4.0 has shut down

The port 7990 may already be in use on the same host.
Identify and stop any process that’s listening on port 7990, or configure this application to listen on another port.

Have you installed and started Bitbucket server before? The process may already be active.

As a quick test run
ps -ef | grep java
To see if Bitbucket is already up and running