Getting access to the SAP Java Connector in Cloud Foundry

[former_member656530]

Hi,

I'm trying to figure out what it takes to gain access to the SAP Java Connector on Cloud Foundry. According to this page in the documentation three things needs to be satisfied:

1. I have to use the SAP Java Buildpack
2. I have to bind the application to an instance of the connectivity service
3. I have to bind the application to an instance of the destination service

I've created a simple maven-project, where I've satisfied all these three conditions. The code for this project can be found here.

My main-method:

public static void main( String[] args )
{
    try {
        JCoDestination destination = JCoDestinationManager.getDestination("TEST");
        System.out.println("Destination exists: " + destination.getDestinationName());
    } catch (JCoException e) {
        e.printStackTrace();
    }
}<br>

I am using this dependency to gain access to the JCo classes (from this tutorial):

<dependency>
  <groupId>com.sap.cloud</groupId>
  <artifactId>neo-java-web-api</artifactId>
  <version>[3.71.8,4.0.0)</version>
  <scope>provided</scope>
</dependency>

This is my manifest file:

---
applications:

  - name: jco-poc
    buildpacks:
      - sap_java_buildpack
    services:
      - jco_poc_connection_service
      - jco_poc_destination_service

However when I push my application I get the following error:

ERR Error: A JNI error has occurred, please check your installation and try again
ERR (/bas/sapjvm/81_REL/src/8/jdk/src/share/bin/java.c 1628)
ERR Exception in thread "main" java.lang.NoClassDefFoundError: com/sap/conn/jco/JCoException
ERR 	at java.lang.Class.getDeclaredMethods0(Native Method)
ERR 	at java.lang.Class.privateGetDeclaredMethods(Class.java:2724)
ERR 	at java.lang.Class.privateGetMethodRecursive(Class.java:3071)
ERR 	at java.lang.Class.getMethod0(Class.java:3041)
ERR 	at java.lang.Class.getMethod(Class.java:1807)
ERR 	at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:564)
ERR 	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:546)
ERR Caused by: java.lang.ClassNotFoundException: com.sap.conn.jco.JCoException
ERR 	at java.net.URLClassLoader.findClass(URLClassLoader.java:444)
ERR 	at java.lang.ClassLoader.loadClass(ClassLoader.java:480)
ERR 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:384)
ERR 	at java.lang.ClassLoader.loadClass(ClassLoader.java:413)
ERR 	... 7 more

Can you please elaborate on what the requirements are for applications, if they wish to use the SAP Java Connector or point me to what I've done wrong in my example.

Am I using the right dependency?

Any help is much appreciated.

[former_member656530]

Additional info:

I am using an SCP Cloud Foundry trial account on cf.eu10.hana.ondemand.com

I have tried the tutorial and that is working for me. However I'm trying to figure out how to avoid creating a web-app.

[MarkusTolksdorf · Accepted solution]

Hello Morten,

good that you added the additional comment, otherwise I would have pointed to the tutorial. In the restrictions section of Invoking ABAP Function Modules via RFC it is mentioned that you need to run your application on top of the TomEE or Tomcat container provided by the buildpack. Hence, you need to run it as a web application. What kind of application did you have in mind?

Best regards,
Markus

[former_member656530 · Accepted solution]

Hi Markus,

Thank you for your answer. I suspected that was the case - as you write - that I need to deploy in the TomEE container for it to work.

I'm trying to build a proof-of-concept of an application consuming messages from SAP Enterprise Messaging and writing entries to SAP using BAPIs.

The reason for this architecture is that I want to minimise the effort required on the on-premise-system to get the solution up and running. This way I would only need two things on the "inside": A user with RFC access and a cloud connector pointing to my SCP subdomain.

I can still do that if my application is deployed as a web-app, so I will have to pursue that road.