[KAFKA-6370] MirrorMakerIntegrationTest#testCommaSeparatedRegex may fail due to NullPointerException

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Cannot Reproduce
• Labels: mirror-maker
• Assignee: huxihx
• Reporter: Ted Yu
• Created: 15/Dec/17 03:42
• Updated: 02/Feb/18 03:35
• Resolved: 02/Feb/18 03:35

Description

From https://builds.apache.org/job/kafka-trunk-jdk8/2277/testReport/junit/kafka.tools/MirrorMakerIntegrationTest/testCommaSeparatedRegex/ :

java.lang.NullPointerException
	at scala.collection.immutable.StringLike.$anonfun$format$1(StringLike.scala:351)
	at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:234)
	at scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:32)
	at scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:29)
	at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:38)
	at scala.collection.TraversableLike.map(TraversableLike.scala:234)
	at scala.collection.TraversableLike.map$(TraversableLike.scala:227)
	at scala.collection.AbstractTraversable.map(Traversable.scala:104)
	at scala.collection.immutable.StringLike.format(StringLike.scala:351)
	at scala.collection.immutable.StringLike.format$(StringLike.scala:350)
	at scala.collection.immutable.StringOps.format(StringOps.scala:29)
	at kafka.metrics.KafkaMetricsGroup$.$anonfun$toScope$3(KafkaMetricsGroup.scala:170)
	at scala.collection.immutable.List.map(List.scala:283)
	at kafka.metrics.KafkaMetricsGroup$.kafka$metrics$KafkaMetricsGroup$$toScope(KafkaMetricsGroup.scala:170)
	at kafka.metrics.KafkaMetricsGroup.explicitMetricName(KafkaMetricsGroup.scala:67)
	at kafka.metrics.KafkaMetricsGroup.explicitMetricName$(KafkaMetricsGroup.scala:51)
	at kafka.network.RequestMetrics.explicitMetricName(RequestChannel.scala:352)
	at kafka.metrics.KafkaMetricsGroup.metricName(KafkaMetricsGroup.scala:47)
	at kafka.metrics.KafkaMetricsGroup.metricName$(KafkaMetricsGroup.scala:42)
	at kafka.network.RequestMetrics.metricName(RequestChannel.scala:352)
	at kafka.metrics.KafkaMetricsGroup.newHistogram(KafkaMetricsGroup.scala:81)
	at kafka.metrics.KafkaMetricsGroup.newHistogram$(KafkaMetricsGroup.scala:80)
	at kafka.network.RequestMetrics.newHistogram(RequestChannel.scala:352)
	at kafka.network.RequestMetrics.<init>(RequestChannel.scala:364)
	at kafka.network.RequestChannel$Metrics.$anonfun$new$2(RequestChannel.scala:57)
	at scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:59)
	at scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:52)
	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
	at kafka.network.RequestChannel$Metrics.<init>(RequestChannel.scala:56)
	at kafka.network.RequestChannel.<init>(RequestChannel.scala:243)
	at kafka.network.SocketServer.<init>(SocketServer.scala:71)
	at kafka.server.KafkaServer.startup(KafkaServer.scala:238)
	at kafka.utils.TestUtils$.createServer(TestUtils.scala:135)
	at kafka.integration.KafkaServerTestHarness.$anonfun$setUp$1(KafkaServerTestHarness.scala:93)

Here is the code from KafkaMetricsGroup.scala :

        .map { case (key, value) => "%s.%s".format(key, value.replaceAll("\\.", "_"))}

It seems (some) value was null.

Issue Links

• links to: GitHub Pull Request #4327
• links to: GitHub Pull Request #4327