Yes, Thank you for that hint. I used the same database for the 1. installation also for the second installation. I now repeated the installation with a new clean database and the redirect works.

This problem is solved.

is this what you are looking for?

17:34:53,104 INFO c.m.s.DefaultServerRunner:50 - Starting DefaultServerRunner on q2256s-MacBook-Pro.local with PID 11519 (/Users/hainguyen/Projects/mycollab/mycollab2/mycollab-server-runner/target/classes started by hainguyen in /Users/hainguyen/Projects/mycollab/mycollab2/mycollab-app-community/src/main)
17:34:53,151 INFO c.m.s.DefaultServerRunner:675 - No active profile set, falling back to default profiles: default
17:34:55,727 INFO o.s.c.a.ConfigurationClassPostProcessor:380 - Cannot enhance @Configuration bean definition 'com.vaadin.spring.VaadinConfiguration' since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as 'static'.
17:34:56,442 INFO o.s.c.s.PostProcessorRegistrationDelegate$BeanPostProcessorChecker:330 - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$201cf18f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
17:34:57,090 WARN i.u.w.jsr:68 - UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
17:34:57,125 INFO i.u.servlet:364 - Initializing Spring embedded WebApplicationContext

Shoud I set up a new clean database?

Here it is:

22:36:32,132 INFO com.mycollab.server.DefaultServerRunner:50 - Starting DefaultServerRunner v7.0.1 on MicroServer with PID 8127 (/home/hch-admin/Websites/MyCollab/lib/mycollab-server-runner-7.0.1.jar started by hch-admin in /home/hch-admin/Websites/MyCollab)
22:36:32,142 INFO com.mycollab.server.DefaultServerRunner:675 - No active profile set, falling back to default profiles: default
22:36:35,409 INFO org.springframework.context.annotation.ConfigurationClassPostProcessor:380 - Cannot enhance @Configuration bean definition 'com.vaadin.spring.VaadinConfiguration' since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as 'static'.
22:36:36,267 INFO org.springframework.context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker:330 - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$dd45b2ea] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
22:36:37,032 WARN io.undertow.websockets.jsr:68 - UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
22:36:37,071 INFO io.undertow.servlet:364 - Initializing Spring embedded WebApplicationContext
22:36:37,071 INFO org.springframework.web.context.ContextLoader:296 - Root WebApplicationContext: initialization completed in 4823 ms
22:36:37,164 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:261 - Registering Vaadin servlet
22:36:37,164 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:263 - Servlet will be mapped to URLs [/vaadinServlet/*, /VAADIN/*]
22:36:37,184 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:282 - Setting servlet init parameters
22:36:37,187 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:306 - Set servlet init parameter [productionMode] = [false]
22:36:37,188 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:306 - Set servlet init parameter [resourceCacheTime] = [3600]
22:36:37,188 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:306 - Set servlet init parameter [heartbeatInterval] = [300]
22:36:37,188 INFO com.vaadin.spring.boot.internal.VaadinServletConfiguration:306 - Set servlet init parameter [closeIdleSessions] = [false]
22:36:42,964 INFO org.apache.jackrabbit.core.RepositoryImpl:259 - Starting repository...

hch-admin@MicroServer:~/Websites/MyCollab/bin$ 22:36:43,413 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:374 - Initialized local revision to 0
22:36:43,413 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:383 - Cluster revision janitor thread not started
22:36:43,414 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:280 - DatabaseJournal initialized.
22:36:43,511 INFO org.apache.jackrabbit.core.RepositoryImpl:2035 - initializing workspace 'ecm'...
22:36:43,657 INFO org.apache.jackrabbit.core.RepositoryImpl:2039 - workspace 'ecm' initialized
22:36:43,662 INFO org.apache.jackrabbit.core.cluster.ClusterNode:1065 - not started: namespace operation ignored.
22:36:43,663 INFO org.apache.jackrabbit.core.RepositoryImpl:547 - created system workspace: default2
22:36:43,667 INFO org.apache.jackrabbit.core.RepositoryImpl:455 - SecurityManager = class org.apache.jackrabbit.core.security.simple.SimpleSecurityManager
22:36:43,670 INFO org.apache.jackrabbit.core.RepositoryImpl:2035 - initializing workspace 'default2'...
22:36:43,697 INFO org.apache.jackrabbit.core.RepositoryImpl:2039 - workspace 'default2' initialized
22:36:43,699 INFO org.apache.jackrabbit.core.security.simple.SimpleSecurityManager:137 - init: using Repository LoginModule configuration for Jackrabbit
22:36:43,743 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 1
22:36:43,830 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 2
22:36:44,021 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 3
22:36:44,117 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 4
22:36:44,149 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 5
22:36:44,153 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 6
22:36:44,179 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 7
22:36:44,189 INFO org.apache.jackrabbit.core.RepositoryImpl:367 - Repository started (1225ms)
22:36:44,240 INFO com.mycollab.module.ecm.ContentSessionFactory:40 - Register node types
22:36:44,296 INFO com.mycollab.module.ecm.ContentSessionFactory:66 - Register mycollab content type
22:36:45,102 INFO org.apache.jackrabbit.core.RepositoryImpl:259 - Starting repository...
22:36:45,259 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:374 - Initialized local revision to 0
22:36:45,260 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:383 - Cluster revision janitor thread not started
22:36:45,260 INFO org.apache.jackrabbit.core.journal.DatabaseJournal:280 - DatabaseJournal initialized.
22:36:45,288 INFO org.apache.jackrabbit.core.RepositoryImpl:2035 - initializing workspace 'wiki'...
22:36:45,344 INFO org.apache.jackrabbit.core.RepositoryImpl:2039 - workspace 'wiki' initialized
22:36:45,344 INFO org.apache.jackrabbit.core.RepositoryImpl:455 - SecurityManager = class org.apache.jackrabbit.core.security.simple.SimpleSecurityManager
22:36:45,345 INFO org.apache.jackrabbit.core.security.simple.SimpleSecurityManager:137 - init: using Repository LoginModule configuration for Jackrabbit
22:36:45,347 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 1
22:36:45,403 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 2
22:36:45,510 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 3
22:36:45,580 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 4
22:36:45,599 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 5
22:36:45,600 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 6
22:36:45,621 INFO org.apache.jackrabbit.core.cluster.ClusterNode:858 - Processing revision: 7
22:36:45,642 INFO org.apache.jackrabbit.core.RepositoryImpl:367 - Repository started (540ms)
22:36:45,645 INFO com.mycollab.module.page.PageSessionFactory:41 - Register node types
22:36:45,662 INFO com.mycollab.module.page.PageSessionFactory:66 - Register MyCollab content type
22:36:46,675 INFO com.mycollab.vaadin.mvp.service.ComponentScannerService:51 - Started resolving view and presenter classes
22:36:47,699 INFO com.mycollab.vaadin.mvp.service.ComponentScannerService:61 - Resolved view and presenter classes com.mycollab.vaadin.mvp.service.ComponentScannerService@e47637c that has 64 view classes and 57 presenter classes
22:36:47,788 INFO com.zaxxer.hikari.HikariDataSource:110 - HikariPool-1 - Starting...
22:36:47,814 INFO com.zaxxer.hikari.HikariDataSource:123 - HikariPool-1 - Start completed.
22:36:47,841 INFO org.flywaydb.core.internal.license.VersionPrinter:49 - Flyway Community Edition 5.2.4 by Boxfuse
22:36:47,855 INFO org.flywaydb.core.internal.database.DatabaseFactory:49 - Database: jdbc:mysql://localhost:3306/collab (MySQL 5.7)
22:36:48,247 INFO org.flywaydb.core.internal.command.DbMigrate:49 - Current version of schema `collab`: 20190212.1
22:36:48,254 ERROR com.mycollab.db.migration.service.DbMigrationRunner:62 - Error while migrate database
org.flywaydb.core.api.FlywayException: Schema `collab` contains a failed migration to version 20190212.1 !
at org.flywaydb.core.internal.command.DbMigrate.migrateGroup(DbMigrate.java:229)
at org.flywaydb.core.internal.command.DbMigrate.access$100(DbMigrate.java:54)
at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:164)
at org.flywaydb.core.internal.command.DbMigrate$2.call(DbMigrate.java:161)
at org.flywaydb.core.internal.database.mysql.MySQLNamedLockTemplate.execute(MySQLNamedLockTemplate.java:60)
at org.flywaydb.core.internal.database.mysql.MySQLConnection.lock(MySQLConnection.java:147)
at org.flywaydb.core.internal.schemahistory.JdbcTableSchemaHistory.lock(JdbcTableSchemaHistory.java:155)
at org.flywaydb.core.internal.command.DbMigrate.migrateAll(DbMigrate.java:161)
at org.flywaydb.core.internal.command.DbMigrate.migrate(DbMigrate.java:139)
at org.flywaydb.core.Flyway$1.execute(Flyway.java:1395)
at org.flywaydb.core.Flyway$1.execute(Flyway.java:1356)
at org.flywaydb.core.Flyway.execute(Flyway.java:1711)
at org.flywaydb.core.Flyway.migrate(Flyway.java:1356)
at com.mycollab.db.migration.service.DbMigrationRunner.migrate(DbMigrationRunner.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:363)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:307)
at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:136)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:414)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1754)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
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.mycollab.server.DefaultServerRunner.main(DefaultServerRunner.java:60)

I removed the variable -server and got the error -Xms394m bad variable name and so on. Finally I removed all following parameters so that line 24 looks like this:

     export MYCOLLAB_OPTS=-noverify

Now I could start up MyCollab. Thanks