> For the complete documentation index, see [llms.txt](https://cover-docs.diffblue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cover-docs.diffblue.com/updates-and-upgrades/release-archive/2023-11-02.md).

# 2023-11-02

In this release, Diffblue Cover now supports writing tests for Java 21 projects - Diffblue now supports LTS Java versions 8, 11, 17, and 21 in production use. Also, the release includes a significant update to the Cover Reports docs topics - <https://docs.diffblue.com/features/cover-reports>. See the full Release Notes below for details of all enhancements and resolved issues covered by this release.

## Enhancements

* Cover: Diffblue Cover now supports writing tests for Java 21 projects. \[Ref: TG-20304]
* CLI: Cover CLI now provides enhanced remediation advice for `E011 - Failed to run a simple example test`. \[Ref: TG-19852]
* Cover: Diffblue Cover now provides improved coverage when writing tests which use double/long/float constant comparisons. \[Ref: TG-18581]
* Plugin: Cover Plugin now creates run configurations when writing skeleton tests. \[Ref: TG-17083]

## Resolved Issues

* Cover: Diffblue Cover now provides improved formatting for Javadoc comments when writing tests. \[Ref: TG-20292]
* Cover: Resolved an issue which caused Diffblue Cover to not write tests for inner classes containing a dollar sign, when executing a run configuration. \[Ref: TG-19819]
* Plugin: Resolved an issue which caused Cover Plugin to hang if a run configuration was executed during project indexing. \[Ref: TG-19708]

## Known Issues

* Plugin: Cover Plugin incorrectly gives the option to write tests for a test file using the menu option, while in the IDE editor. \[Ref: TG-17163]
* Cover: Cover may produce tests for JUnit 4.10 and lower that do not compile due to the use of `assertNotEquals`. \[Ref: TG-17605]
* Cover: Diffblue Cover supports Open JDK and Oracle JDK; results with other JDKs may differ due to the variability in their implementations of Java. \[Ref: TG-19345]
* Cover: Cover may encounter an `F009: Internal error` while writing tests using Mockito 5. To avoid this issue use a version of Mockito earlier than 5. \[Ref: TG-19610]