ENGINE-16004 IO Error: Socket read timed out - Discussion & Questions

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Hi, I have installed v7.10 pre-packaged camunda. Every time after server started,it’s all fine,but after a few minutes engine shutdown. it says IO error: socket read timed out,but my DB(oracle 11g) is running well.Sorry for my poor English
10-Jul-2019 09:51:39.390 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 31832 ms
10-Jul-2019 09:54:13.050 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Deploying javax.ws.rs.core.Application: class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.065 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding class resource org.camunda.bpm.engine.rest.impl.JaxRsTwoNamedProcessEngineRestServiceImpl from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.066 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.mapper.JacksonConfigurator from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.066 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.exception.JsonMappingExceptionHandler from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.067 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.exception.JsonParseExceptionHandler from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.068 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.hal.JacksonHalJsonProvider from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.068 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding class resource org.camunda.bpm.engine.rest.impl.JaxRsTwoDefaultProcessEngineRestServiceImpl from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.069 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.exception.ProcessEngineExceptionHandler from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.072 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.mapper.MultipartPayloadProvider from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.072 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class org.camunda.bpm.engine.rest.exception.RestExceptionHandler from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:13.074 信息 [http-nio-8080-exec-1] org.jboss.resteasy.logging.impl.Slf4jLogger.info Adding provider class com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider from Application class org.camunda.bpm.engine.rest.impl.application.DefaultApplication
10-Jul-2019 09:54:51.616 信息 [http-nio-8080-exec-5] org.jboss.resteasy.logging.impl.Slf4jLogger.info Deploying javax.ws.rs.core.Application: class org.camunda.bpm.admin.impl.web.AdminApplication
10-Jul-2019 09:54:51.816 信息 [http-nio-8080-exec-8] org.jboss.resteasy.logging.impl.Slf4jLogger.info Deploying javax.ws.rs.core.Application: class org.camunda.bpm.webapp.impl.engine.EngineRestApplication
10-Jul-2019 09:55:01.197 信息 [http-nio-8080-exec-5] org.jboss.resteasy.logging.impl.Slf4jLogger.info Deploying javax.ws.rs.core.Application: class org.camunda.bpm.tasklist.impl.web.TasklistApplication
10-Jul-2019 10:59:20.529 信息 [http-nio-8080-exec-4] org.jboss.resteasy.logging.impl.Slf4jLogger.info Deploying javax.ws.rs.core.Application: class org.camunda.bpm.cockpit.impl.web.CockpitApplication
10-Jul-2019 10:59:39.718 严重 [http-nio-8080-exec-1] org.camunda.commons.logging.BaseLogger.logError ENGINE-16004 Exception while closing command context: 
### Error querying database.  Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
### The error may exist in org/camunda/bpm/engine/impl/mapping/entity/Authorization.xml
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT distinct(A.GROUP_ID_) FROM ACT_RU_AUTHORIZATION A
### Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
 org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
### The error may exist in org/camunda/bpm/engine/impl/mapping/entity/Authorization.xml
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT distinct(A.GROUP_ID_) FROM ACT_RU_AUTHORIZATION A
### Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
	at org.camunda.bpm.engine.impl.db.sql.DbSqlSession.selectList(DbSqlSession.java:97)
	at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectListWithRawParameter(DbEntityManager.java:183)
	at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectList(DbEntityManager.java:175)
	at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectList(DbEntityManager.java:171)
	at org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager.selectList(DbEntityManager.java:151)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.filterAuthenticatedGroupIds(AuthorizationManager.java:878)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.enableQueryAuthCheck(AuthorizationManager.java:382)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.configureQuery(AuthorizationManager.java:356)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.configureQuery(AuthorizationManager.java:396)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.configureQuery(AuthorizationManager.java:392)
	at org.camunda.bpm.engine.impl.persistence.entity.AuthorizationManager.configureProcessDefinitionQuery(AuthorizationManager.java:529)
	at org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionManager.configureProcessDefinitionQuery(ProcessDefinitionManager.java:383)
	at org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionManager.findProcessDefinitionCountByQueryCriteria(ProcessDefinitionManager.java:110)
	at org.camunda.bpm.engine.impl.ProcessDefinitionQueryImpl.executeCount(ProcessDefinitionQueryImpl.java:327)
	at org.camunda.bpm.engine.impl.AbstractQuery.evaluateExpressionsAndExecuteCount(AbstractQuery.java:181)
	at org.camunda.bpm.engine.impl.AbstractQuery.execute(AbstractQuery.java:174)
	at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:27)
	at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:106)
	at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:69)
	at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)
	at org.camunda.bpm.engine.impl.AbstractQuery.count(AbstractQuery.java:159)
	at org.camunda.bpm.engine.rest.impl.ProcessDefinitionRestServiceImpl.getProcessDefinitionsCount(ProcessDefinitionRestServiceImpl.java:138)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
	at org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:159)
	at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:92)
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:44)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:100)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:70)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:54)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:61)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:59)
	at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:43)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:59)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:770)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
	at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:899)
	at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
	at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
	at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3714)
	at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1378)
	at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114)
	at com.sun.proxy.$Proxy4.execute(Unknown Source)
	at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)
	at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
	... 80 more
Caused by: oracle.net.ns.NetException: Socket read timed out
	at oracle.net.ns.Packet.receive(Packet.java:347)
	at oracle.net.ns.DataPacket.receive(DataPacket.java:106)
	at oracle.net.ns.NetInputStream.getNextPacket(NetInputStream.java:324)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:268)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:190)
	at oracle.net.ns.NetInputStream.read(NetInputStream.java:107)
	at oracle.jdbc.driver.T4CSocketInputStreamWrapper.readNextPacket(T4CSocketInputStreamWrapper.java:124)
	at oracle.jdbc.driver.T4CSocketInputStreamWrapper.read(T4CSocketInputStreamWrapper.java:80)
	at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1137)
	at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:350)
	at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
	at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
	at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
	at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
	... 98 more
10-Jul-2019 10:59:39.729 警告 [http-nio-8080-exec-1] org.camunda.bpm.engine.rest.exception.ProcessEngineExceptionHandler.toResponse org.camunda.bpm.engine.ProcessEngineException: Process engine persistence exception
	at org.camunda.bpm.engine.impl.interceptor.CommandInvocationContext.rethrow(CommandInvocationContext.java:150)
	at org.camunda.bpm.engine.impl.interceptor.CommandContext.close(CommandContext.java:177)
	at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:115)
	at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:69)
	at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32)
	at org.camunda.bpm.engine.impl.AbstractQuery.count(AbstractQuery.java:159)
	at org.camunda.bpm.engine.rest.impl.ProcessDefinitionRestServiceImpl.getProcessDefinitionsCount(ProcessDefinitionRestServiceImpl.java:138)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167)
	at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257)
	at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222)
	at org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:159)
	at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:92)
	at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524)
	at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126)
	at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55)
	at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:44)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.engine.rest.filter.EmptyBodyFilter.doFilter(EmptyBodyFilter.java:100)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:164)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilterSecure(SecurityFilter.java:70)
	at org.camunda.bpm.webapp.impl.security.filter.SecurityFilter.doFilter(SecurityFilter.java:54)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:61)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter$1.execute(AuthenticationFilter.java:59)
	at org.camunda.bpm.webapp.impl.security.SecurityActions.runWithAuthentications(SecurityActions.java:43)
	at org.camunda.bpm.webapp.impl.security.auth.AuthenticationFilter.doFilter(AuthenticationFilter.java:59)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:770)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
### The error may exist in org/camunda/bpm/engine/impl/mapping/entity/Authorization.xml
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT distinct(A.GROUP_ID_) FROM ACT_RU_AUTHORIZATION A
### Cause: java.sql.SQLRecoverableException: IO 错误: Socket read timed out
              Hi @manda091x,
how did you configure your database connection? It seems the connection get lost after the initial queries.
Cheers, Ingo
              Hi Ingo,

here is my database conneciton in /tomcat/conf/server.xml:
<Resource name="jdbc/ProcessEngine"
              auth="Container"
              type="javax.sql.DataSource" 
              factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
              uniqueResourceName="process-engine"
              driverClassName="oracle.jdbc.driver.OracleDriver" 
			  url="jdbc:oracle:thin:@11.11.74.121:1521:orcl"
              defaultTransactionIsolation="READ_COMMITTED"
              username="camunda_bpm"  
              password="camunda_2019"
              maxActive="20"
              minIdle="5"
              maxIdle="20" />
thanks