doc: JDK17 toolchain requirements

Signed-off-by: Andreas Reichel <andreas@manticore-projects.com>

Author: manticore-projects

README.md

@@ -67,6 +67,8 @@ For details, please see https://storage.googleapis.com/gweb-research2023-media/p
 
 JSQLParser-4.9 was the last JDK8 compatible version. JSQLParser-5.0 and later depend on JDK11 and introduce API breaking changes to the AST Visitors. Please see the Migration Guide for the details.
 
+Building JSQLParser-5.1 and newer with Gradle will depend on a JDK17 toolchain due to the used plugins.
+
 ## [Supported Grammar and Syntax](https://jsqlparser.github.io/JSqlParser/syntax.html)
 
 **JSqlParser** aims to support the SQL standard as well as all major RDBMS. Any missing syntax or features can be added on demand.

src/site/sphinx/usage.rst

@@ -18,7 +18,7 @@ How to use it
 Compile from Source Code
 ==============================
 
-You will need to have ``JDK 8`` or ``JDK 11`` installed. Please note that JSQLParser-4.9 is the last ``JDK 8`` compatible release and all development after will depend on ``JDK 11``.
+You will need to have ``JDK 8`` or ``JDK 11`` installed. Please note that JSQLParser-4.9 is the last ``JDK 8`` compatible release and all development after will depend on ``JDK 11``. Building JSQLParser-5.1 and newer with Gradle will depend on a JDK17 toolchain due to the used plugins.
 
 .. tab:: Maven