# 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 - . 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] --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://cover-docs-preview.diffblue.com/updates-and-upgrades/release-archive/2023-11-02.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.