OpenStack throws NullPointerException when connecting

Question

I'm trying to connect OpenStack before creating tenant. It gives a NullPointerException from OpenStackClient.request() in the "openstack-client-3.2.1.jar".

The code and the beginning of stack trace are as below:

UsernamePassword usernamePassword = new UsernamePassword(userA,passA)
com.woorea.openstack.keystone.model.Access access = 
    keystone
     .tokens()
     .authenticate(usernamePassword)
     .execute();

The stacktrace is:

 [java] java.lang.NullPointerException
 [java]     at com.woorea.openstack.base.client.OpenStackClient.request(OpenStackClient.java:51)
 [java]     at com.woorea.openstack.base.client.OpenStackClient.execute(OpenStackClient.java:66)
 [java]     at com.woorea.openstack.base.client.OpenStackRequest.execute(OpenStackRequest.java:98)
 [java]     at vep.openstack.OpenStackConnector.addUser(OpenStackConnector.java:624)

Answer 1

It was required to add one of the three libraries (ie openstack-client-connectors) listed below:

jersey-connector

jersey2-connector

resteasy-connector

Answer 2

The variable userA is null. You need to properly initialize it.