myql驱动升级flowable项目启动报错

最近系统升级需要将mysql的驱动升到8.0.27，升级后启动项目发现涉及到工作流的项目报错。Caused by: java.lang.ClassCastException: java.time.LocalDateTime cannot be cast to java.lang.String。报错信息是类型转换异常，我们找到报错的代码。这是因为mysql驱动升级后从库里面加载出来的时间是LocalDateTime的类型，所以就会报错。
升级的mysql驱动版本

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.27</version>
            <scope>runtime</scope>
 </dependency>

flowable工作流使用的版本

<dependency>
            <groupId>org.flowable</groupId>
            <artifactId>flowable-spring-boot-starter</artifactId>
            <version>6.4.1</version>
        </dependency>

报错信息

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'runtimeServiceBean' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration.class]: Unsatisfied dependency expressed through method 'runtimeServiceBean' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'processEngine' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration$AlreadyInitializedAppEngineConfiguration.class]: Unsatisfied dependency expressed through method 'processEngine' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowableAppEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:798) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:539) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1290) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	... 32 common frames omitted
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'processEngine' defined in class path resource [org/flowable/spring/boot/ProcessEngineServicesAutoConfiguration$AlreadyInitializedAppEngineConfiguration.class]: Unsatisfied dependency expressed through method 'processEngine' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowableAppEngine': FactoryBean threw exception on object creation; nested exception is org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:798) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:539) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1290) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:885) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:789) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	... 45 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowableAppEngine': 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:178) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1818) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1266) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1290) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1210) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:885) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:789) ~[spring-beans-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	... 59 common frames omitted
Caused by: org.flowable.common.engine.api.FlowableException: Error initialising dmn data model
	at org.flowable.dmn.engine.impl.db.DmnDbSchemaManager.initSchema(DmnDbSchemaManager.java:67) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.engine.impl.db.DmnDbSchemaManager.initSchema(DmnDbSchemaManager.java:48) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.engine.impl.db.DmnDbSchemaManager.initSchema(DmnDbSchemaManager.java:44) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.engine.impl.cmd.SchemaOperationsDmnEngineBuild.execute(SchemaOperationsDmnEngineBuild.java:27) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.engine.impl.cmd.SchemaOperationsDmnEngineBuild.execute(SchemaOperationsDmnEngineBuild.java:23) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.common.engine.impl.interceptor.DefaultCommandInvoker.execute(DefaultCommandInvoker.java:22) ~[flowable-engine-common-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.dmn.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:49) ~[flowable-dmn-spring-6.4.1.jar:6.4.1]
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140) ~[spring-tx-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	at org.flowable.dmn.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:46) ~[flowable-dmn-spring-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.dmn.engine.impl.DmnEngineImpl.<init>(DmnEngineImpl.java:48) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.engine.DmnEngineConfiguration.buildDmnEngine(DmnEngineConfiguration.java:217) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	at org.flowable.dmn.spring.SpringDmnEngineConfiguration.buildDmnEngine(SpringDmnEngineConfiguration.java:67) ~[flowable-dmn-spring-6.4.1.jar:6.4.1]
	at org.flowable.dmn.spring.configurator.SpringDmnEngineConfigurator.initDmnEngine(SpringDmnEngineConfigurator.java:68) ~[flowable-dmn-spring-configurator-6.4.1.jar:6.4.1]
	at org.flowable.dmn.spring.configurator.SpringDmnEngineConfigurator.configure(SpringDmnEngineConfigurator.java:57) ~[flowable-dmn-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-5.2.5.RELEASE.jar:5.2.5.RELEASE]
	... 69 common frames omitted
Caused by: java.lang.ClassCastException: java.time.LocalDateTime cannot be cast to java.lang.String
	at liquibase.changelog.StandardChangeLogHistoryService.getRanChangeSets(StandardChangeLogHistoryService.java:328) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.changelog.AbstractChangeLogHistoryService.upgradeChecksums(AbstractChangeLogHistoryService.java:66) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.changelog.StandardChangeLogHistoryService.upgradeChecksums(StandardChangeLogHistoryService.java:297) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.Liquibase.checkLiquibaseTables(Liquibase.java:1228) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.Liquibase.update(Liquibase.java:193) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.Liquibase.update(Liquibase.java:179) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.Liquibase.update(Liquibase.java:175) ~[liquibase-core-3.8.8.jar:na]
	at liquibase.Liquibase.update(Liquibase.java:168) ~[liquibase-core-3.8.8.jar:na]
	at org.flowable.dmn.engine.impl.db.DmnDbSchemaManager.initSchema(DmnDbSchemaManager.java:61) ~[flowable-dmn-engine-6.4.1.jar:6.4.1]
	... 93 common frames omitted

解决办法重写liquibase.changelog.StandardChangeLogHistoryService这个类

修改前代码

Object tmpDateExecuted = rs.get("DATEEXECUTED");
                    Date dateExecuted = null;
                    if (tmpDateExecuted instanceof Date) {
                        dateExecuted = (Date) tmpDateExecuted;
                    } else {
                        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        try {
                            dateExecuted = df.parse((String) tmpDateExecuted);
                        } catch (ParseException e) {
                        }
                    }

修改后代码：

Object tmpDateExecuted = rs.get("DATEEXECUTED");
                    Date dateExecuted = null;
                    if (tmpDateExecuted instanceof Date) {
                        dateExecuted = (Date) tmpDateExecuted;
                    } else if(tmpDateExecuted instanceof LocalDateTime){
                        ZoneId zoneId = ZoneId.systemDefault();
                        ZonedDateTime zonedDateTime = ((LocalDateTime) tmpDateExecuted).atZone(zoneId);
                        dateExecuted = Date.from(zonedDateTime.toInstant());
                    } else {
                        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        try {
                            dateExecuted = df.parse((String) tmpDateExecuted);
                        } catch (ParseException e) {
                        }
                    }