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No suitable driver found for jdbc:postgresql://localhost:5432/activiti
java.sql.SQLException: No suitable driver found for jdbc:postgresql://localhost:5432/activiti	at org.activiti.engine.impl.db.DbSqlSession.isTablePresent(DbSqlSession.java:890)	at org.activiti.engine.impl.db.DbSqlSession.isEngineTablePresent(DbSqlSession.java:854)	at org.activiti.engine.impl.db.DbSqlSession.dbSchemaUpdate(DbSqlSession.java:806)	at org.activiti.engine.impl.db.DbSqlSession.performSchemaOperationsProcessEngineBuild(DbSqlSession.java:1100)	at org.activiti.engine.impl.SchemaOperationsProcessEngineBuild.execute(SchemaOperationsProcessEngineBuild.java:25)	at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)	at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:60)	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)	at org.activiti.engine.impl.ProcessEngineImpl.(ProcessEngineImpl.java:75)	at org.activiti.engine.impl.cfg.ProcessEngineConfigurationImpl.buildProcessEngine(ProcessEngineConfigurationImpl.java:311)	at org.activiti.engine.ProcessEngines.buildProcessEngine(ProcessEngines.java:194)	at org.activiti.engine.ProcessEngines.initProcessEnginFromResource(ProcessEngines.java:167)	at org.activiti.engine.ProcessEngines.init(ProcessEngines.java:98)	at org.activiti.engine.ProcessEngines.getProcessEngine(ProcessEngines.java:224)	at org.activiti.engine.ProcessEngines.getDefaultProcessEngine(ProcessEngines.java:217)	at org.activiti.rest.servlet.ActivitiServletContextListener.contextInitialized(ActivitiServletContextListener.java:39)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977)	at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1655)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)	at java.util.concurrent.FutureTask.run(FutureTask.java:138)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)	at java.lang.Thread.run(Thread.java:662)