stephen mallette created TINKERPOP-1172:
-------------------------------------------

             Summary: Reconnect to Gremlin Server previously marked as dead
                 Key: TINKERPOP-1172
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1172
             Project: TinkerPop
          Issue Type: Bug
          Components: driver
    Affects Versions: 3.1.1-incubating
            Reporter: stephen mallette
            Assignee: stephen mallette
             Fix For: 3.1.2-incubating


We have a test to validate that this works when connecting to multiple servers 
in a round-robin fashion but nothing that tests against a single server and it 
seems that there are some problems around that particular situation. It tends 
to manifest as:

{code}
Caused by: java.lang.NullPointerException: null
        at 
org.apache.tinkerpop.gremlin.driver.ConnectionPool.considerUnavailable(ConnectionPool.java:392)
 ~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at 
org.apache.tinkerpop.gremlin.driver.ConnectionPool.<init>(ConnectionPool.java:101)
 ~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at 
org.apache.tinkerpop.gremlin.driver.Client$SessionedClient.initializeImplementation(Client.java:558)
 ~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at org.apache.tinkerpop.gremlin.driver.Client.init(Client.java:117) 
~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at 
org.apache.tinkerpop.gremlin.driver.Client.submitAsync(Client.java:182) 
~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at 
org.apache.tinkerpop.gremlin.driver.Client.submitAsync(Client.java:174) 
~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        at org.apache.tinkerpop.gremlin.driver.Client.submit(Client.java:144) 
~[gremlin-driver-3.1.2-SNAPSHOT.jar:3.1.2-SNAPSHOT]
        ... 21 common frames omitted
{code}

when the {{ConnectionPool}} can not be intialized in any way at start up. If 
that happens the {{Client}} doesn't seem to recover well.



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