eXist-db 5.2.0 Released

January 23, 2020

Submitted by Adam Retter.

We are very happy to announce that eXist-db 5.2.0 has been released.

5.2.0 is a minor release, and as such should be 100% API compatible with 5.0.0. Whilst this is a fairly conservative release, it fixes two critical issues:

  1. We fixed a concurrency issue in the reuse of hot Locks which could appear under high-load and cause a transaction to error and abort. This issue is present in all eXist-db 5.x.x versions prior to 5.2.0, but not 4.7.1. This issue could cause corruption in a <5.2.0 system.

  2. We fixed a live-lock in the Transaction Manager which could appear under high-load and prevent a transaction from completing. This issue is present in all eXist-db 5.x.x version prior to 5.2.0, but not 4.7.1. This issue could cause a <5.2.0 system to eventually lock-up.


  • Implemented the XQuery function array:put #3092
  • Implemented the XQuery function fn:json-to-xml #3093
  • Facility to have Document locks use the same hierarchical path based locking as Collection locks #3208
  • Extended hierarchical facets to accept multiple values passed in via an array #3182
  • Improved the performance of FastStringBuffer #3186
  • Implemented isOpen() and close() methods on XML:DB API's RemoteCollection #2881
  • Improved log messages when disk space is exhausted #3127


  • Fixed a livelock in the Transaction Manager #3156
  • Fixed a Concurrency Issue in Lock Reuse #3219
  • Fixed an issue where the wrong Lucene Index Config could of been selected #3142
  • Fixed an NPE which prevented the Content Extraction Module from functioning #3206
  • Fixed opening the Statistics Index #3201
  • Fixed a Cast Exception in fn:subsequence on sequences with atomic values #3199
  • Fixed a memory-leak when shutting down an instance; occurred when there were multiple instances #3171
  • Removed unused options in conf.xml #3127
  • Removed extraneous logging of stack traces #3140
  • Fixed log level of failed index lookups #3200
  • Many small code improvements #3178

Updated Libraries

  • Apache Commons Codec 1.14 #3189
  • Apache HTTP Components 4.5.11 #3213
  • Apache Log4j 2.13.0 #3162
  • Apache Tika 1.23 #3215
  • Apache Xerces 2.12.1 #3218
  • Caffeine 2.8.1 #3204
  • Eclipse Jetty 9.4.26.v20200117 #3211
  • EXPath HTTP Client 1.2.2 #3216
  • EXQuery 0.1.35 #3198
  • Jackson 2.10.2 #3188
  • jcTools 3.0.0 #3187
  • jline 3.13.3 #3190
  • jUnit 4.13 #3180
  • lz4-java 1.7.1 #3212
  • rsyntaxtextarea 3.0.8 #3181
  • Saxon-HE 9.9.1-6 #3150
  • Slf4j API 1.7.30

Backwards Compatibility

eXist-db 5.2.0 is binary compatible with previous eXist-db 5.x.x versions back to 5.0.0-RC6.

Regardless, before upgrading to this version of eXist-db, it is strongly recommended to perform a full backup and restore. Users who are upgrading should always consult the Upgrading Guide in the documentation. For details of backwards compatibility with versions of eXist-db prior to 5.0.0-RC6, please see the Backwards Compatibility details of 5.0.0-RC6.

Downloading this Version

  • eXist-db v5.2.0 is available for download from Bintray.
  • Docker images are available from eXist-db's DockerHub.
  • Maven artifacts are available from Maven Central.
  • Mac users of the Homebrew package repository may acquire eXist 5.2.0 directly from there via the exist-db cask.

News items may be commercial in nature and are published as received.