Richard Swart created TINKERPOP-2597:
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Summary: NullPointerException while initializing connection pool
Key: TINKERPOP-2597
URL: https://issues.apache.org/jira/browse/TINKERPOP-2597
Project: TinkerPop
Issue Type: Bug
Components: driver
Affects Versions: 3.5.0
Reporter: Richard Swart
When are experiencing an occasional NullPointerException during connection pool
initialization. It seems that there is an error while trying to connect to the
gremlin database (in our case on Azure). The error triggers the pool to try and
kill available connections which results in an unhandled NullPointerException.
As a result the original exception is swallowed and the pool never recovers
from this state.
{code:java}
java.lang.RuntimeException: Could not initialize client for
Host{address=xxxx.gremlin.cosmos.azure.com/10.10.10.10:443,
hostUri=wss://xxxx.gremlin.cosmos.azure.com:443/gremlin}
at
org.apache.tinkerpop.gremlin.driver.Client$ClusteredClient.lambda$new$4(Client.java:571)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
org.apache.tinkerpop.gremlin.driver.Client$ClusteredClient.lambda$null$0(Client.java:529)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(Unknown Source)
~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
Source) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source) ~[na:na]
at java.base/java.lang.Thread.run(Unknown Source) ~[na:na]
Caused by: java.lang.NullPointerException: null
at
org.apache.tinkerpop.gremlin.driver.ConnectionPool.killAvailableConnections(ConnectionPool.java:273)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
org.apache.tinkerpop.gremlin.driver.ConnectionPool.closeAsync(ConnectionPool.java:256)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
org.apache.tinkerpop.gremlin.driver.ConnectionPool.<init>(ConnectionPool.java:115)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
org.apache.tinkerpop.gremlin.driver.ConnectionPool.<init>(ConnectionPool.java:78)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
at
org.apache.tinkerpop.gremlin.driver.Client$ClusteredClient.lambda$new$4(Client.java:565)
~[gremlin-driver-3.5.0.jar!/:3.5.0]
... 5 common frames omitted {code}
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