Activti整合SSM的异常(DbSqlSession或者Error creating bean with name 'processEngine)

我在使用activiti整合ssm时，刚开始的时候还好好的。先使用了一个demo类。在数据库生成了activiti的24张表，后来删除了这个测试类。并且将24张表的内容全部清空。发布服务时出现如下异常

[INFO]
[INFO] --- tomcat7-maven-plugin:2.2:run (default-cli) @ activiti_spring_items ---
[INFO] Running war on http://localhost:9999/activiti_spring
[INFO] Using existing Tomcat server configuration at F:\maven\activiti_spring_items\target\tomcat
[INFO] create webapp with contextPath: /activiti_spring
六月 27, 2018 5:53:19 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-bio-9999"]
六月 27, 2018 5:53:19 下午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Tomcat
六月 27, 2018 5:53:19 下午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.47
六月 27, 2018 5:53:23 下午 org.apache.catalina.core.ApplicationContext log
信息: No Spring WebApplicationInitializer types detected on classpath
六月 27, 2018 5:53:24 下午 org.apache.catalina.core.ApplicationContext log
信息: Initializing Spring root WebApplicationContext
2018-06-27 17:53:24.211 [localhost-startStop-1] INFO  org.springframework.web.context.ContextLoader -Root WebApplicationContext: initialization started
2018-06-27 17:53:24.289 [localhost-startStop-1] INFO  o.s.web.context.support.XmlWebApplicationContext -Refreshing Root WebApplicationContext: startup date [Wed Jun 27 17:53:24 CST 2018]; root of context hierarchy
2018-06-27 17:53:24.335 [localhost-startStop-1] INFO  o.s.beans.factory.xml.XmlBeanDefinitionReader -Loading XML bean definitions from file [F:\maven\activiti_spring_items\target\classes\applicationContext_activiti.xml]
2018-06-27 17:53:24.476 [localhost-startStop-1] INFO  o.s.beans.factory.xml.XmlBeanDefinitionReader -Loading XML bean definitions from file [F:\maven\activiti_spring_items\target\classes\applicationContext_dao.xml]
2018-06-27 17:53:24.585 [localhost-startStop-1] INFO  o.s.beans.factory.xml.XmlBeanDefinitionReader -Loading XML bean definitions from file [F:\maven\activiti_spring_items\target\classes\applicationContext_service.xml]
2018-06-27 17:53:24.897 [localhost-startStop-1] INFO  o.s.c.support.PropertySourcesPlaceholderConfigurer -Loading properties file from class path resource [jdbc.properties]
2018-06-27 17:53:24.897 [localhost-startStop-1] INFO  o.s.b.f.a.AutowiredAnnotationBeanPostProcessor -JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2018-06-27 17:53:25.620 [localhost-startStop-1] INFO  com.alibaba.druid.pool.DruidDataSource -{dataSource-1} inited
2018-06-27 17:53:27.322 [localhost-startStop-1] WARN  o.s.web.context.support.XmlWebApplicationContext -Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
2018-06-27 17:53:27.338 [localhost-startStop-1] INFO  com.alibaba.druid.pool.DruidDataSource -{dataSource-1} closed
2018-06-27 17:53:27.338 [localhost-startStop-1] ERROR org.springframework.web.context.ContextLoader -Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerExceptionat org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1595) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1127) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1022) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:778) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839) ~[spring-context-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538) ~[spring-context-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) ~[spring-web-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) ~[spring-web-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) [spring-web-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939) [tomcat-embed-core-7.0.47.jar:7.0.47]at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) [tomcat-embed-core-7.0.47.jar:7.0.47]at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-7.0.47.jar:7.0.47]at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) [tomcat-embed-core-7.0.47.jar:7.0.47]at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) [tomcat-embed-core-7.0.47.jar:7.0.47]at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_161]at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]
Caused by: java.lang.NullPointerException: nullat org.activiti.engine.impl.db.DbSqlSession.dbSchemaUpdate(DbSqlSession.java:1081) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.db.DbSqlSession.performSchemaOperationsProcessEngineBuild(DbSqlSession.java:1473) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:25) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47) ~[activiti-spring-5.18.0.jar:5.18.0]at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133) ~[spring-tx-4.2.8.RELEASE.jar:4.2.8.RELEASE]at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45) ~[activiti-spring-5.18.0.jar:5.18.0]at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.ProcessEngineImpl.<init>(ProcessEngineImpl.java:77) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:427) ~[activiti-engine-5.18.0.jar:5.18.0]at org.activiti.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:65) ~[activiti-spring-5.18.0.jar:5.18.0]at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:60) ~[activiti-spring-5.18.0.jar:5.18.0]at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:32) ~[activiti-spring-5.18.0.jar:5.18.0]at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.2.8.RELEASE.jar:4.2.8.RELEASE]... 28 common frames omitted
六月 27, 2018 5:53:27 下午 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerExceptionat org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175)at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1595)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1127)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1022)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:778)at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerExceptionat org.activiti.engine.impl.db.DbSqlSession.dbSchemaUpdate(DbSqlSession.java:1081)at org.activiti.engine.impl.db.DbSqlSession.performSchemaOperationsProcessEngineBuild(DbSqlSession.java:1473)at org.activiti.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:25)at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24)at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57)at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:31)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40)at org.activiti.engine.impl.ProcessEngineImpl.<init>(ProcessEngineImpl.java:77)at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:427)at org.activiti.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:65)at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:60)at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:32)at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)... 28 more

出错原因如下：

1：配置文件出错

2：本地的仓库的jar包有问题

3：act_ge_property表中的数据被清除了

在把所有的配置文件都核对过一遍后。还是不行。这时我将导入的数据库更换就好了

最后找到主要原因是：在act_ge_property表中的数据被清除了、使用demo类再次部署流程定义后。再次启动即可

写这篇博客来记录错误

牢记这个问题了。。。。。。。。

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Activti整合SSM的异常(DbSqlSession或者Error creating bean with name 'processEngine)

Activti整合SSM的异常(DbSqlSession或者Error creating bean with name 'processEngine)

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