activiti5.21 couldn‘t deduct database type from database product name ...

问题

之前的老项目，要求国产化，之前项目的数据库时oracle，要求改成dm，数据迁移之后，启动提示couldn’t deduct database type from database product name ‘DM DBMS’，然后去百度大概是出了几个方案，报错

1. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processEngine': FactoryBean threw exception on object creation; nested exception is org.activiti.engine.ActivitiException: couldn't deduct database type from database product name 'DM DBMS'
2.         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175)
3.         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)
4.         at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1595)
5.         at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:254)
6.         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
7.         at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:368)
8.         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123)
9.         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018)
10.         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:510)
11.         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
12.         at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
13.         at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
14.         at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
15.         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
16.         at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
17.         at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
18.         at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
19.         at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444)
20.         at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326)
21.         at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)
22.         at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4441)
23.         at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4899)
24.         at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
25.         at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:710)
26.         at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:687)
27.         at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:660)
28.         at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1775)
29.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
30.         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
31.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
32.         at java.lang.reflect.Method.invoke(Method.java:498)
33.         at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:292)
34.         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
35.         at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
36.         at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:453)
37.         at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:407)
38.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
39.         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
40.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
41.         at java.lang.reflect.Method.invoke(Method.java:498)
42.         at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:292)
43.         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
44.         at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
45.         at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
46.         at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
47.         at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
48.         at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
49.         at java.security.AccessController.doPrivileged(Native Method)
50.         at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
51.         at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
52.         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
53.         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
54.         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
55.         at java.lang.reflect.Method.invoke(Method.java:498)
56.         at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
57.         at sun.rmi.transport.Transport$1.run(Transport.java:200)
58.         at sun.rmi.transport.Transport$1.run(Transport.java:197)
59.         at java.security.AccessController.doPrivileged(Native Method)
60.         at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
61.         at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
62.         at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
63.         at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
64.         at java.security.AccessController.doPrivileged(Native Method)
65.         at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
66.         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
67.         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
68.         at java.lang.Thread.run(Thread.java:748)
69. Caused by: org.activiti.engine.ActivitiException: couldn't deduct database type from database product name 'DM DBMS'
70.         at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.initDatabaseType(ProcessEngineConfigurationImpl.java:859)
71.         at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.initDataSource(ProcessEngineConfigurationImpl.java:803)
72.         at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.init(ProcessEngineConfigurationImpl.java:619)
73.         at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:607)
74.         at org.activiti.spring.SpringProcessEngineConfiguration.buildProcessEngine(SpringProcessEngineConfiguration.java:65)
75.         at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:60)
76.         at org.activiti.spring.ProcessEngineFactoryBean.getObject(ProcessEngineFactoryBean.java:32)
77.         at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)
78.         ... 66 more

复制代码

问题处理

为啥我要给图p上呢，因为这四套方案我反面都试了，都崩了，然后摇人才处理了。
实在最好使，也是双亲委派的想法，加载activiti的数据库驱动的类，反面的方案就是重写源码，这三套方案，都是挺难实在。

重写这四个类就可以，所谓的重写，就是直接找到这个类然后去复制。

然后就遇到了这个问题，这个问题在我看来真的天塌了，太难啦！
我是不能理解为啥会提示这个报错呢，

然后再点进去，才发现了这个地方，缺少依赖jar，hibernate-jpa-2.0-api-1.0.1.Final.jar就是因为这个jar，把这个jar放在了我的lib的时候，就没有报错了。
然后就可以启动了，

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