[ZOOKEEPER-3895] Client side NullPointerException in case of empty Multi operation

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.6.1
• Fix Version/s: 3.7.0, 3.6.2
• Component/s: java client
• Assignee: Enrico Olivelli
• Reporter: Enrico Olivelli
• Created: 23/Jul/20 06:45
• Updated: 10/Sep/20 10:43
• Resolved: 29/Jul/20 17:13

Description

I saw this error in an application that uses Apache BookKeeper DistributedLog library.

This is a regression on 3.6.x release series

The bug is in ZooKeeper Java Client.

Caused by: java.lang.NullPointerExceptionCaused by: java.lang.NullPointerException at org.apache.zookeeper.ZooKeeper.multiInternal(ZooKeeper.java:2105) at org.apache.zookeeper.ZooKeeper.multi(ZooKeeper.java:2050) at org.apache.bookkeeper.zookeeper.ZooKeeperClient.access$1101(ZooKeeperClient.java:70) at org.apache.bookkeeper.zookeeper.ZooKeeperClient$3.zkRun(ZooKeeperClient.java:498) at org.apache.bookkeeper.zookeeper.ZooKeeperClient$ZkRetryRunnable.run(ZooKeeperClient.java:389) at org.apache.bookkeeper.zookeeper.ZooKeeperClient.multi(ZooKeeperClient.java:510) at org.apache.distributedlog.zk.ZKTransaction.execute(ZKTransaction.java:67) at org.apache.distributedlog.BKLogWriteHandler.setLogSegmentTruncationStatus(BKLogWriteHandler.java:1223) at org.apache.distributedlog.BKLogWriteHandler.setLogSegmentsOlderThanDLSNTruncated(BKLogWriteHandler.java:1117) at org.apache.distributedlog.BKLogWriteHandler.lambda$setLogSegmentsOlderThanDLSNTruncated$0(BKLogWriteHandler.java:1083) at java.base/java.util.concurrent.CompletableFuture.uniComposeStage(CompletableFuture.java:1183) at java.base/java.util.concurrent.CompletableFuture.thenCompose(CompletableFuture.java:2299) at org.apache.distributedlog.BKLogWriteHandler.setLogSegmentsOlderThanDLSNTruncated(BKLogWriteHandler.java:1082) at org.apache.distributedlog.BKAsyncLogWriter.truncate(BKAsyncLogWriter.java:449)