Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowableAppEngine': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:178) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1674) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1249) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:330) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1251) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1171) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	... 47 common frames omitted
Caused by: java.lang.NullPointerException: null
	at org.flowable.engine.impl.db.ProcessDbSchemaManager.schemaUpdate(ProcessDbSchemaManager.java:185) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:54) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:28) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:51) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:93) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:72) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:56) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.interceptor.BpmnOverrideContextInterceptor.execute(BpmnOverrideContextInterceptor.java:25) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53) ~[flowable-engine-common-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:71) ~[flowable-engine-common-6.4.1.jar:6.4.1]
	at org.flowable.common.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:49) ~[flowable-spring-common-6.4.1.jar:6.4.1]
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) ~[spring-tx-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:46) ~[flowable-spring-common-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) ~[flowable-engine-common-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56) ~[flowable-engine-common-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.ProcessEngineImpl.<init>(ProcessEngineImpl.java:78) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:904) ~[flowable-engine-6.4.1.jar:6.4.1]
	at org.flowable.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:72) ~[flowable-spring-6.4.1.jar:6.4.1]
	at org.flowable.engine.spring.configurator.SpringProcessEngineConfigurator.initProcessEngine(SpringProcessEngineConfigurator.java:58) ~[flowable-spring-configurator-6.4.1.jar:6.4.1]
	at org.flowable.engine.spring.configurator.SpringProcessEngineConfigurator.configure(SpringProcessEngineConfigurator.java:47) ~[flowable-spring-configurator-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.AbstractEngineConfiguration.configuratorsAfterInit(AbstractEngineConfiguration.java:887) ~[flowable-engine-common-6.4.1.jar:6.4.1]
	at org.flowable.app.engine.AppEngineConfiguration.init(AppEngineConfiguration.java:222) ~[flowable-app-engine-6.4.1.jar:6.4.1]
	at org.flowable.app.engine.AppEngineConfiguration.buildAppEngine(AppEngineConfiguration.java:180) ~[flowable-app-engine-6.4.1.jar:6.4.1]
	at org.flowable.app.spring.SpringAppEngineConfiguration.buildAppEngine(SpringAppEngineConfiguration.java:61) ~[flowable-app-engine-spring-6.4.1.jar:6.4.1]
	at org.flowable.app.spring.AppEngineFactoryBean.getObject(AppEngineFactoryBean.java:59) ~[flowable-app-engine-spring-6.4.1.jar:6.4.1]
	at org.flowable.app.spring.AppEngineFactoryBean.getObject(AppEngineFactoryBean.java:31) ~[flowable-app-engine-spring-6.4.1.jar:6.4.1]
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
	... 57 common frames omitted