The following error is reported when starting a project inherited from Flowable and Spring Boot:

05.824 INFO  o.f.s.SpringProcessEngineConfiguration:922  main                    Executing configure() of class org.flowable.dmn.spring.configurator.SpringDmnEngineConfigurator (priority:200000)
09.818 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
19.821 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
29.825 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
39.835 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
49.851 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
59.859 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
09.864 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
19.879 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
29.894 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
39.907 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
49.911 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
59.930 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
09.939 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
19.944 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
29.966 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
39.975 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
49.989 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
00.000 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
10.013 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
20.022 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
30.035 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
40.052 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
50.058 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
00.065 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
10.075 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
20.078 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
30.097 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
40.114 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
50.129 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
00.142 INFO  liquibase.lockservice         :26   main                    Waiting for changelog lock....
10.377 WARN  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext:591  main                    Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appletLeaveController': Unsatisfied dependency expressed through field 'leaveService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appletLeaveServiceImpl': Unsatisfied dependency expressed through field 'flowableProcessInstanceService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'flowableProcessInstanceServiceImpl': Unsatisfied dependency expressed through field 'historyService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'historyServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'historyServiceBean' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
10.572 INFO  c.a.druid.pool.DruidDataSource:2071 main                    {dataSource-1} closing ...
10.638 INFO  c.a.druid.pool.DruidDataSource:2144 main                    {dataSource-1} closed
10.697 INFO  o.a.c.core.StandardService    :173  main                    Stopping service [Tomcat]
10.981 ERROR o.s.boot.SpringApplication    :830  main                    Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appletLeaveController': Unsatisfied dependency expressed through field 'leaveService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appletLeaveServiceImpl': Unsatisfied dependency expressed through field 'flowableProcessInstanceService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'flowableProcessInstanceServiceImpl': Unsatisfied dependency expressed through field 'historyService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'historyServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'historyServiceBean' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:953)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:740)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:415)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
	at com.sinosoft.MobileAppletBusinessApplication.main(MobileAppletBusinessApplication.java:32)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'appletLeaveServiceImpl': Unsatisfied dependency expressed through field 'flowableProcessInstanceService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'flowableProcessInstanceServiceImpl': Unsatisfied dependency expressed through field 'historyService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'historyServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'historyServiceBean' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656)
	... 18 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'flowableProcessInstanceServiceImpl': Unsatisfied dependency expressed through field 'historyService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'historyServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'historyServiceBean' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:659)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:639)
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656)
	... 32 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'historyServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'historyServiceBean' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800)
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:656)
	... 46 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:176)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1884)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1284)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:345)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791)
	... 59 common frames omitted
Caused by: org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.flowable.common.engine.impl.db.LiquibaseBasedSchemaManager.initSchema(LiquibaseBasedSchemaManager.java:68)
	at org.flowable.dmn.engine.impl.db.DmnDbSchemaManager.initSchema(DmnDbSchemaManager.java:36)
	at org.flowable.dmn.engine.impl.cmd.SchemaOperationsDmnEngineBuild.execute(SchemaOperationsDmnEngineBuild.java:27)
	at org.flowable.dmn.engine.impl.cmd.SchemaOperationsDmnEngineBuild.execute(SchemaOperationsDmnEngineBuild.java:23)
	at org.flowable.common.engine.impl.interceptor.DefaultCommandInvoker.execute(DefaultCommandInvoker.java:22)
	at org.flowable.common.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:53)
	at org.flowable.common.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72)
	at org.flowable.common.spring.SpringTransactionInterceptor.lambda$execute$0(SpringTransactionInterceptor.java:56)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
	at org.flowable.common.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:56)
	at org.flowable.common.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30)
	at org.flowable.common.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:56)
	at org.flowable.dmn.engine.impl.DmnEngineImpl.<init>(DmnEngineImpl.java:48)
	at org.flowable.dmn.engine.DmnEngineConfiguration.buildDmnEngine(DmnEngineConfiguration.java:217)
	at org.flowable.dmn.spring.SpringDmnEngineConfiguration.buildDmnEngine(SpringDmnEngineConfiguration.java:69)
	at org.flowable.dmn.spring.configurator.SpringDmnEngineConfigurator.initDmnEngine(SpringDmnEngineConfigurator.java:68)
	at org.flowable.dmn.spring.configurator.SpringDmnEngineConfigurator.configure(SpringDmnEngineConfigurator.java:57)
	at org.flowable.common.engine.impl.AbstractEngineConfiguration.configuratorsAfterInit(AbstractEngineConfiguration.java:923)
	at org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl.init(ProcessEngineConfigurationImpl.java:1016)
	at org.flowable.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:915)
	at org.flowable.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:72)
	at org.flowable.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:60)
	at org.flowable.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:32)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:169)
	... 69 common frames omitted
Caused by: org.flowable.common.engine.api.FlowableException: Error updating dmn engine tables
	at org.flowable.common.engine.impl.db.LiquibaseBasedSchemaManager.schemaUpdate(LiquibaseBasedSchemaManager.java:105)
	at org.flowable.common.engine.impl.db.LiquibaseBasedSchemaManager.initSchema(LiquibaseBasedSchemaManager.java:61)
	... 92 common frames omitted
Caused by: liquibase.exception.LockException: Could not acquire change log lock.  Currently locked by DESKTOP-T9LSH1H (192.168.1.108) since 22-6-15 上午9:27
	at liquibase.lockservice.StandardLockService.waitForLock(StandardLockService.java:234)
	at liquibase.Liquibase.lambda$update$1(Liquibase.java:214)
	at liquibase.Scope.lambda$child$0(Scope.java:177)
	at liquibase.Scope.child(Scope.java:186)
	at liquibase.Scope.child(Scope.java:176)
	at liquibase.Scope.child(Scope.java:155)
	at liquibase.Liquibase.runInScope(Liquibase.java:2404)
	at liquibase.Liquibase.update(Liquibase.java:211)
	at liquibase.Liquibase.update(Liquibase.java:197)
	at liquibase.Liquibase.update(Liquibase.java:193)
	at liquibase.Liquibase.update(Liquibase.java:185)
	at org.flowable.common.engine.impl.db.LiquibaseBasedSchemaManager.schemaUpdate(LiquibaseBasedSchemaManager.java:103)
	... 93 common frames omitted

Process finished with exit code 1

After investigation, it was found that the problem was MySQL

Solution: find a table whose table name is suffixed with databasechangeloglock and change it to the format shown in the following figure to solve the problem

Note: all tables suffixed with databasechangeloglock should be checked