Deployment of .jar in .rar in .ear

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Hi, was wondering what is the difference between deploying using NetWeaver and using Deployment Tool? Secondly, when I tried deploying using Deplyment tool of my .rar file within an .ear file, I got this error

ERROR: Not deployed. Deploy Service returned ERROR:

java.rmi.RemoteException: Cannot deploy application sap.com/MyProgram..

Reason: Cannot access methods of instance of class "com.xxx.spi.AdapterManagedConnectionFactory". Possible reasons: the class is not public and is in another package, the current method does not have access to the appropriate zero-argument constructor or there is no such method.; nested exception is:

com.sap.engine.services.deploy.container.DeploymentException: <--Localization failed: ResourceBundle='com.sap.engine.services.deploy.DeployResourceBundle', ID='com.sap.engine.services.connector.exceptions.BaseDeploymentException: Cannot access methods of instance of class "com.doterp.jca.sap.spi.AdapterManagedConnectionFactory". Possible reasons: the class is not public and is in another package, the current method does not have access to the appropriate zero-argument constructor or there is no such method.

The deployed class does have a zero-argument constructor, so what else am I missing here? Thanks.

Jonathan