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https://issues.apache.org/jira/browse/TINKERPOP-1172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15167274#comment-15167274
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ASF GitHub Bot commented on TINKERPOP-1172:
-------------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/incubator-tinkerpop/pull/235
> 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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