RFC Destination does not exist

I'm trying to configure an application running in Tomcat 8.5 with Neo Cloud SDK 3.54.23 to connect to an RFC destination and run the following code:

String destinationName = "RFCQueryEndpoint";
ErpConfigContext erpConfigContext = new ErpConfigContext(destinationName);
ErpEndpoint endpoint = new ErpEndpoint(erpConfigContext);
response.getWriter().write(new Gson().toJson(new
             DefaultFinancialTransactionService().getList()
             .execute(endpoint).getListOfSelectedTransactions()));

I have tried multiple ways of configuring the RFC destination, but none of them worked.

I've tried setting a destinations environment variable with:

[{name: "RFCQueryEndpoint", type: "RFC", jco.client.ashost: "host-here", jco.client.client: "100", jco.client.lang: "EN", jco.client.passwd: "pass-here", jco.client.sysnr: "01", jco.client.user: "user-here"}]

I have tried configuring the destination within the server config, as explained in https://help.sap.com/viewer/cca91383641e40ffbe03bdc78f00f681/Cloud/en-US/7fa92ffa007346f58491999361928303.html

I have tried creating a file with a .jcoDestination ending and setting the property -Djco.destinations.dir=/home/cassio/jco-destinations but none of them worked.

I'm always getting:

12:20:50.040 [http-nio-8080-exec-4] ERROR  - com.sap.conn.jco.JCoException: (106) JCO_ERROR_RESOURCE: Destination RFCQueryEndpoint does not exist
12:20:50.043 [http-nio-8080-exec-4] ERROR  - com.sap.conn.jco.JCoException: (106) JCO_ERROR_RESOURCE: Destination RFCQueryEndpoint does not exist
com.sap.cloud.sdk.s4hana.connectivity.rfc.exception.RemoteFunctionException: com.sap.conn.jco.JCoException: (106) JCO_ERROR_RESOURCE: Destination RFCQueryEndpoint does not exist
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.JCoRemoteFunctionQueryExecutor.execute(JCoRemoteFunctionQueryExecutor.java:202)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.JCoRemoteFunctionQueryExecutor.execute(JCoRemoteFunctionQueryExecutor.java:55)
    at com.sap.cloud.sdk.s4hana.connectivity.rfc.BapiQuery.execute(BapiQuery.java:91)
    at com.sap.cloud.sdk.s4hana.datamodel.bapi.functions.DefaultFinancialTransactionGetListFunction.execute(DefaultFinancialTransactionGetListFunction.java:469)
    at MyServlet.doGet(MyServlet.java:77)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    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:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestContextServletFilter$1.execute(RequestContextServletFilter.java:219)
    at com.sap.cloud.sdk.cloudplatform.servlet.Executable.call(Executable.java:23)
    at com.sap.cloud.sdk.cloudplatform.servlet.Executable.call(Executable.java:13)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestContextCallable.call(RequestContextCallable.java:82)
    at com.sap.cloud.sdk.cloudplatform.servlet.RequestContextServletFilter.doFilter(RequestContextServletFilter.java:221)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpCachingHeaderFilter.doFilter(HttpCachingHeaderFilter.java:56)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at com.sap.cloud.sdk.cloudplatform.security.servlet.HttpSecurityHeadersFilter.doFilter(HttpSecurityHeadersFilter.java:41)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.filters.RestCsrfPreventionFilter.doFilter(RestCsrfPreventionFilter.java:113)
    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:504)
    at com.sap.cloud.runtime.impl.bridge.security.AbstractAuthenticator.invoke(AbstractAuthenticator.java:206)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at com.sap.core.tenant.valve.TenantValidationValve.invokeNextValve(TenantValidationValve.java:182)
    at com.sap.core.tenant.valve.TenantValidationValve.invoke(TenantValidationValve.java:97)
    at com.sap.js.statistics.tomcat.valve.RequestTracingValve.callNextValve(RequestTracingValve.java:101)
    at com.sap.js.statistics.tomcat.valve.RequestTracingValve.invoke(RequestTracingValve.java:57)
    at com.sap.core.js.monitoring.tomcat.valve.RequestTracingValve.invoke(RequestTracingValve.java:27)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$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)

How can I properly configure an RFC destination locally, using SAP tools for Eclipse, to connect to an S/4 Hana On-Prem system using Neo Cloud SDK + Tomcat?

Solution

I found what I believe is a workaround.

If I simply set the destination on the server configuration in Eclipse, the SDK finds the destination name but can't find the configuration.

I had to set the destination both in the server config page, as explained here: https://help.sap.com/viewer/cca91383641e40ffbe03bdc78f00f681/Cloud/en-US/7fa92ffa007346f58491999361928303.html

And I also had to create the RFCendpoint.jcoDestination file, as follows:

Name=RFCendpoint
Type=RFC
jco.client.client=100
jco.client.lang=EN
jco.client.user=User-here
jco.client.passwd=Password-here
jco.client.ashost=Host-here
jco.client.sysnr=00
jco.destination.pool_capacity=5
jco.destination.peak_limit=10

and pass the directory the file resides in via the -Djco.destinations.dir=/home/cassio/jco-destinations flag in the arguments section of my Run configuration in Eclipse.

With both of these configs I was able to get the SDK to recgonize both the endpoint name and its configuration. Then I was able to use the service as well as call other BAPIs via BapiQuery.