How to call business objects in BO part from a servlet in lean-webapp

Hi Gurus,
for oci-implementation (and as it has been suggested here: http://scn.sap.com/thread/3340669) we want to implement a servlet that calls certain actions in a business object. The servlet resides inside the leanwebapp-DC. The business object is in the bo-part of our own custom module. Our problem is to find a way for the servlet to call the business logic. Our first thought was to go via the moduleAccess. However, we could not figure out how to access the module of the leanwebapp.
Any suggestions?
Best regards,
Christian

Hey Wolfgang,
thank you very much for your quick and accurate answer.
After struggling a little bit with our project setup we implemented your solution and it worked immediately.
However, we now have the problem to declare the module dependency between the leanwebapp and the bo-part of our module. The Development-and-Extension-Guide for WCEM 3.0 tells us (page 39) to do this in the metadata.xml of the calling module (which would be the leanwebapp). Unfortunately, the leanwebapp does not have a metadata.xml.
Declaring the dependency in the .dcdef of the leanwebapp-DC leads to either:
a runtime exception while calling ModuleAccess moduleAccess = wecSession.getModuleAccess("oci"); in the servlet (com.sap.wec.tc.core.modulemgmt.metadata.exceptions.ModuleRuntimeException: Module access of module 'oci' cannot be created. It is not part of the current application.) or
a runtime time exception while accessing the servlet:
Caused by: com.sap.wec.tc.core.common.init.InitializeException: Error initializing 'com.sap.wec.tc.core.modulemgmt.metadata.ModuleMetaDataDeploymentModel' com.sap.wec.tc.core.modulemgmt.metadata.exceptions.ModuleRuntimeException: The deployment unit contains multiple JAR files or folders which declare the same part/namespace combination. Module: 'oci', part: 'bo', namespace: 'xxx', JAR/Folder 1: 'D:\usr\sap\DE2\J02\j2ee\cluster\apps\xxx.com\xxx~oci~dpu\app_libraries_container\xxx.com~xxx~oci~bo~assembly.jar', JAR/Folder 2: 'D:\usr\sap\DE2\J02\j2ee\cluster\apps\xxx.com\demo-leanapp\servlet_jsp\demo\root\WEB-INF\lib\xxx.com~xxx~oci~bo~assembly.jar'
Do you have any hints on how to declare the dependeny properly?
Best regards,
Christian

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