[AVRO-1854] NPE on recursive datatype in JSON encoder

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 1.7.7
• Component/s: java
• Assignee: Unassigned
• Reporter: Douglas Kaminsky
• Created: 27/May/16 19:24
• Updated: 04/Nov/20 17:14
• Resolved: 04/Nov/20 17:13

Description

When trying to encode to JSON a record whose schema contains a recursive type embedded in another type (ie. an array), the "flatten" method in the Parser leaves a hole in the middle of the symbol stack which causes a NPE to occur. My best guess is that it's leaving space for the embedded recursion but never populating the symbol, but that code is a bit obtuse so I am having trouble getting to the root cause (otherwise I would have provided a patch to solve the problem as well).

Attached is a class with a short main method that replicates the problem with anonymized versions of my datatypes/record and a screenshot of the symbol stack at runtime right before the error occurs.

Not yet tested in 1.8.0 but should be easy to verify.

Issue Links

• duplicates: AVRO-1667 Parser symbol tree flattening is broken for recursive schemas