SecurityGroups.java

String accesskeyid = ...
String secretkey = ...
String provider = ... //e.g., "aws-ec2"
  
ComputeServiceContext context = ContextBuilder.newBuilder("aws-ec2")
  .credentials(accesskeyid, secretkey)
  .buildView(ComputeServiceContext.class);

Optional<SecurityGroupExtension> optional = context.getComputeService().getSecurityGroupExtension();

if(optional.isPresent()) {
  SecurityGroupExtension securityGroupExtension = optional.get();

  String nodeId= ... //e.g. "eu-west-1/i-ecf0037a"    
  ComputeMetadata node = context.getComputeService().getNodeMetadata(nodeId); 
  Set<SecurityGroup> sgForNode = securityGroupExtension
                                   .listSecurityGroupsForNode(node.getId());

  //delete Node and wait        
  destroyNodeAndWait(nodeId);
  
  for (SecurityGroup group : sgForNode) {
    //delete security groups (it would be necessary to check if another node is using it currenlty)
    securityGroupExtension.removeSecurityGroup(group.getId());
  }

}
...