OrientDB migration from 2.0.12 to 2.2.18

I was using below API for fetching the vertex in 2.0.12 and it was working

OrientGraphFactory factory = new OrientGraphFactory("remote:172.21.112.228/mydb", "root", "root").setupPool(1,50);
        OrientGraphNoTx graph = factory.getNoTx();
graph.getVertices("Test.name","zyx");

But with the latest 2.2.18, when I tried with

OrientGraphFactory factory = new OrientGraphFactory("memory:172.21.112.228/mydb", "root", "root").setupPool(1,50);
        OrientGraphNoTx graph = factory.getNoTx();
graph.getVertices("Test.name","zyx");

I am getting below error,

Exception in thread "main" java.lang.IllegalArgumentException: 
OClass not found in the schema: Test
    at com.tinkerpop.blueprints.impls.orient.OrientBaseGraph.getVertices(OrientBaseGraph.java:814)
    at test.GetOrientDBData.main(GetOrientDBData.java:57)

Try following code:

OrientGraphFactory factory = new OrientGraphFactory("memory:mydb", 
     "root", "root").setupPool(1,50); 
OrientGraphNoTx graph = factory.getNoTx(); 
if(g.getVertexType("Test") == null){
  g.createVertexType("Test");
}
graph.getVertices("Test.name","zyx");

Two changes on your code:

1. removed the IP in the memory: URL, no need for that

2. added a check to make sure that Test class exists and in case create it