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Could not get JDBC Connection; nested exception is java.sql.SQLException: Listener refused the connection with the following error: ORA-12520, TNS:listener could not find available handler for requested type of server

at org.springframework.jdbc.datasource.DataSourceUtils(getConnection:80)

at org.springframework.jdbc.core.JdbcTemplate(execute:382)

at org.springframework.jdbc.core.JdbcTemplate(query:456)

at org.springframework.jdbc.core.JdbcTemplate(query:464)

at org.springframework.jdbc.core.JdbcTemplate(queryForList:495)

at com.altsoft.kaisa_internet.instances.encpol.dao.InstanceDAO(getObjecttypes:123)

at com.altsoft.kaisa_internet.instances.encpol.service.InstanceServiceImpl(getObjectTypeByName:124)

at sun.reflect.GeneratedMethodAccessor92(invoke:-1)

at sun.reflect.DelegatingMethodAccessorImpl(invoke:43)

at java.lang.reflect.Method(invoke:497)

at org.springframework.aop.support.AopUtils(invokeJoinpointUsingReflection:318)

at org.springframework.aop.framework.ReflectiveMethodInvocation(invokeJoinpoint:183)

at org.springframework.aop.framework.ReflectiveMethodInvocation(proceed:150)

at org.springframework.transaction.interceptor.TransactionInterceptor(invoke:110)

at org.springframework.aop.framework.ReflectiveMethodInvocation(proceed:172)

at org.springframework.aop.interceptor.ExposeInvocationInterceptor(invoke:90)

at org.springframework.aop.framework.ReflectiveMethodInvocation(proceed:172)

at org.springframework.aop.framework.JdkDynamicAopProxy(invoke:202)

at com.sun.proxy.$Proxy23(getObjectTypeByName:-1)

at com.altsoft.kaisa_internet.instances.encpol.controller.WelcomeController(getArticles:61)

at sun.reflect.GeneratedMethodAccessor98(invoke:-1)

at sun.reflect.DelegatingMethodAccessorImpl(invoke:43)

at java.lang.reflect.Method(invoke:497)

at org.springframework.web.method.support.InvocableHandlerMethod(invoke:212)

at org.springframework.web.method.support.InvocableHandlerMethod(invokeForRequest:126)

at org.springframework.web.method.annotation.ModelFactory(invokeModelAttributeMethods:123)

at org.springframework.web.method.annotation.ModelFactory(initModel:97)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter(invokeHandlerMethod:614)

at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter(handleInternal:578)

at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter(handle:80)

at org.springframework.web.servlet.DispatcherServlet(doDispatch:900)

at org.springframework.web.servlet.DispatcherServlet(doService:827)

at org.springframework.web.servlet.FrameworkServlet(processRequest:882)

at org.springframework.web.servlet.FrameworkServlet(doGet:778)

at javax.servlet.http.HttpServlet(service:621)

at javax.servlet.http.HttpServlet(service:728)

at org.apache.catalina.core.ApplicationFilterChain(internalDoFilter:303)

at org.apache.catalina.core.ApplicationFilterChain(doFilter:208)

at org.springframework.web.filter.HiddenHttpMethodFilter(doFilterInternal:77)

at org.springframework.web.filter.OncePerRequestFilter(doFilter:76)

at org.apache.catalina.core.ApplicationFilterChain(internalDoFilter:241)

at org.apache.catalina.core.ApplicationFilterChain(doFilter:208)

at org.apache.tomcat.websocket.server.WsFilter(doFilter:52)

at org.apache.catalina.core.ApplicationFilterChain(internalDoFilter:241)

at org.apache.catalina.core.ApplicationFilterChain(doFilter:208)

at org.apache.catalina.core.StandardWrapperValve(invoke:219)

at org.apache.catalina.core.StandardContextValve(invoke:110)

at org.apache.catalina.authenticator.AuthenticatorBase(invoke:492)

at org.apache.catalina.core.StandardHostValve(invoke:165)

at org.apache.catalina.valves.ErrorReportValve(invoke:104)

at org.apache.catalina.valves.AccessLogValve(invoke:1025)

at org.apache.catalina.core.StandardEngineValve(invoke:116)

at org.apache.catalina.connector.CoyoteAdapter(service:451)

at org.apache.coyote.http11.AbstractHttp11Processor(process:1201)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler(process:654)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor(doRun:1782)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor(run:1741)

at java.util.concurrent.ThreadPoolExecutor(runWorker:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker(run:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable(run:61)

at java.lang.Thread(run:745)