Error trying to get Activiti 6 UI up using the original released war

As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.

kausdi

I am trying to get the acitiviti 6 UI up. I downloaded the war from https://github.com/Activiti/Activiti/releases/tag/activiti-6.0.0.

When trying to deploy the activiti-app war or the activiti-rest war (Tomcat 9, Java 8). I get the following error: 

java.util.ServiceConfigurationError: org.activiti.engine.cfg.ProcessEngineConfigurator: Provider org.activiti.management.jmx.JMXConfigurator not a subtype

        at java.util.ServiceLoader.fail(ServiceLoader.java:239)

        at java.util.ServiceLoader.access$300(ServiceLoader.java:185)

        at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:376)

        at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)

        at java.util.ServiceLoader$1.next(ServiceLoader.java:480)

        at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.initConfigurators(ProcessEngineConfigurationImpl.java:1377)

        at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.init(ProcessEngineConfigurationImpl.java:682)

        at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:664)

        at org.activiti.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:65)

        at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:57)

        at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:32)

        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)

I tried to checkout the 6.x branch and build the war and deploy, same error.

Don't know why I am getting this. I am getting it here: 

ServiceLoader<ProcessEngineConfigurator> configuratorServiceLoader
      = ServiceLoader.load(ProcessEngineConfigurator.class, classLoader);
int nrOfServiceLoadedConfigurators = 0;
for (ProcessEngineConfigurator configurator : configuratorServiceLoader) { //on this line
   allConfigurators.add(configurator);
   nrOfServiceLoadedConfigurators++;
}

clearly configuratorServiceLoader is created by scanning all of ProcessEngineerConfigurator still the 'org.activiti.management.jmx.JMXConfigurator not a subtype' error comes. The 

JMXConfigurator extends AbstractProcessEngineConfigurator

 as well.

I tried the following when the processEngineConfiguration bean is created so that the above statements are not executed at all.

processEngineConfiguration.setEnableConfiguratorServiceLoader(false);

Post this I started getting another error:

Caused by: liquibase.exception.ChangeLogParseException: Error Reading Migration File: Found 3 files that match org/activiti/form/db/liquibase/activiti-form-db-changelog.xml

        at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:112)

        at liquibase.parser.core.xml.AbstractChangeLogParser.parse(AbstractChangeLogParser.java:17)

        at liquibase.Liquibase.getDatabaseChangeLog(Liquibase.java:229)

        at liquibase.Liquibase.update(Liquibase.java:202)

        at liquibase.Liquibase.update(Liquibase.java:192)

        at liquibase.Liquibase.update(Liquibase.java:188)

        at liquibase.Liquibase.update(Liquibase.java:181)

        at org.activiti.form.engine.FormEngineConfiguration.initDbSchema(FormEngineConfiguration.java:575)

        ... 153 common frames omitted

Caused by: java.io.IOException: Found 3 files that match org/activiti/form/db/liquibase/activiti-form-db-changelog.xml

        at liquibase.util.StreamUtil.singleInputStream(StreamUtil.java:205)

        at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:93)

Can anyone suggest what am I doing wrong, surely I shouldn't require to change the original code to get it up considered the released war is also giving errors.