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Splunk DB Connect 3.3.0 getting java.lang.NullPointerException trying to setup MS SQL connection

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Hi

Please help!

I've been struggling to configure a Splunk DB Connect connection to connect to an MS SQL 2008 DB.

I suspect it's a JVM / JDBC driver issue but just cannot win this one.

When trying to save the connection using the UI I get the following message:
"There was an error processing your request. It has been logged (ID 239a7f9b0a5bb917)."
The ID corresponds to the stack trace in the log, shown below.

Installation:
CentOS Linux 7 (Core)
Single-instance Splunk Enterprise Version: 8.0.2
Splunk DB Connect 3.3.0
OpenJDK 1.8.0 64-Bit Server VM (build 25.242-b08, mixed mode)
(also tried openjdk-11.0.6.10-1.el77.x8664)

Tried these JDBC drivers downloaded from Microsoft:
sqljdbc6.2/enu/mssql-jdbc-6.2.2.jre8.jar
sqljdbc
4.2/enu/jre8/sqljdbc42.jar

I've tried setting the log level to DEBUG using the UI, but it gives an error. I've set the log level stanzas but unable to see any DEBUG level logs:

local/dbx_settings.conf
[loglevel]
connector = DEBUG
processor = DEBUG

and also

local/dbxlogging.conf
[logger
dbx]
level=DEBUG

[logger_splunk]
level=DEBUG

This error is logged (splunk/var/log/splunk/splunkappdbconnectserver.log):

[dw-56 - POST /api/connections/status] ERROR io.dropwizard.jersey.errors.LoggingExceptionMapper - Error handling a request: 239a7f9b0a5bb917
java.lang.NullPointerException: null
at com.splunk.dbx.connector.logger.AuditLogger.replace(AuditLogger.java:50)
at com.splunk.dbx.connector.logger.AuditLogger.error(AuditLogger.java:44)
at com.splunk.dbx.server.api.service.database.impl.DatabaseMetadataServiceImpl.getStatus(DatabaseMetadataServiceImpl.java:159)
at com.splunk.dbx.server.api.service.database.impl.DatabaseMetadataServiceImpl.getConnectionStatus(DatabaseMetadataServiceImpl.java:116)
at com.splunk.dbx.server.api.resource.ConnectionResource.getConnectionStatusOfEntity(ConnectionResource.java:72)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:124)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:167)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:219)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:79)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:469)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:391)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:80)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:253)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:232)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:680)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:392)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:365)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:318)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
at io.dropwizard.jetty.NonblockingServletHolder.handle(NonblockingServletHolder.java:50)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1617)
at io.dropwizard.servlets.ThreadNameFilter.doFilter(ThreadNameFilter.java:35)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at io.dropwizard.jersey.filter.AllowedMethodsFilter.handle(AllowedMethodsFilter.java:47)
at io.dropwizard.jersey.filter.AllowedMethodsFilter.doFilter(AllowedMethodsFilter.java:41)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at com.splunk.dbx.server.api.filter.ResponseHeaderFilter.doFilter(ResponseHeaderFilter.java:30)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1604)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:545)
at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1297)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:485)
at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1212)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:249)
at io.dropwizard.jetty.RoutingHandler.handle(RoutingHandler.java:52)
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:717)
at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:54)
at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:173)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:500)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:547)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:270)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:388)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.lang.Thread.run(Thread.java:748)

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