Java 21 mention in the docs

Author: andrus

docs/asciidoc/cayenne-guide/src/docs/asciidoc/_cayenne-guide/part1/setup.adoc

@@ -27,7 +27,7 @@ include::../var.adoc[]
 |Cayenne Version |Java Version |Status
 
 |5.0
-|Java 11 or newer
+|Java 21 or newer
 |Development
 
 |4.2

docs/asciidoc/getting-started-db-first/src/docs/asciidoc/_getting-started-db-first/part1-setup.adoc

@@ -19,7 +19,7 @@ This chapter lists the recommended software used in the tutorial.
 
 ==== Java
 
-Cayenne 5.0 requires JDK 11 or newer.
+Cayenne 5.0 requires JDK 21 or newer.
 
 ==== IntelliJ IDEA IDE
 

docs/asciidoc/getting-started-db-first/src/docs/asciidoc/_getting-started-db-first/part4-java-classes.adoc

@@ -53,7 +53,7 @@ Note that Cayenne code is unrecognized, that's because we need to include Cayenn
     </dependencies>
 ----
 
-Additionally we need to tell `Maven compiler plugin` that our code uses Java 11:
+Additionally we need to tell `Maven compiler plugin` that our code uses Java 21:
 [source,xml]
 ----
 <build>
@@ -62,8 +62,8 @@ Additionally we need to tell `Maven compiler plugin` that our code uses Java 11:
         <plugin>
             <artifactId>maven-compiler-plugin</artifactId>
             <configuration>
-                <source>11</source>
-                <target>11</target>
+                <source>21</source>
+                <target>21</target>
             </configuration>
         </plugin>
     ...

docs/asciidoc/getting-started-guide/src/docs/asciidoc/_getting-started-guide/java-classes.adoc

@@ -34,7 +34,7 @@ should see pairs of classes generated for each mapped entity. You probably also
 there's a bunch of red squiggles next to the newly generated Java classes in IDEA.
 This is because our project does not include Cayenne as a Maven dependency yet. Let's
 fix it now by adding "cayenne" artifact in the bottom of the `pom.xml` file.
-Also we should tell Maven compile plugin that our project needs Java 8.
+Also we should tell Maven compile plugin that our project needs Java 21.
 The resulting POM should look like this:
 
 [source,xml,subs="verbatim,attributes"]
@@ -48,8 +48,8 @@ The resulting POM should look like this:
 
     <properties>
         <cayenne.version>{project-version}</cayenne.version> <!--1-->
-        <maven.compiler.source>11</maven.compiler.source> <!--2-->
-        <maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.source>21</maven.compiler.source> <!--2-->
+        <maven.compiler.target>21</maven.compiler.target>
     </properties>
 
     <dependencies>
@@ -67,7 +67,7 @@ The resulting POM should look like this:
 </project>
 ----
 <1> Here you can specify the version of Cayenne you are actually using
-<2> Tell Maven to support Java 11
+<2> Tell Maven to support Java 21
 
 Your computer must be connected to the internet. Once you edit the `pom.xml`, IDEA
 will download the needed Cayenne jar file and add it to the project build path. As a

docs/asciidoc/getting-started-guide/src/docs/asciidoc/_getting-started-guide/setup.adoc

@@ -18,7 +18,7 @@ installed) a minimally needed set of software to build a Cayenne application.
 
 === Install Java
 
-Obviously, JDK has to be installed. Cayenne 5.0 requires JDK 11 or newer.
+Obviously, JDK has to be installed. Cayenne 5.0 requires JDK 21 or newer.
 
 === Install IntelliJ IDEA
 

docs/asciidoc/upgrade-guide/src/docs/asciidoc/_upgrade-guide/changes.adoc

@@ -14,8 +14,8 @@
 
 == Java Version
 
-Minimum required JDK version is 11 or newer. If your project requires Java 8, you should keep using Cayenne 4.2.
-Cayenne 5.0 is fully tested with Java 11, 17 and 21.
+Minimum required JDK version is 21 or newer. If your project requires Java 8 or 11, you should keep using Cayenne 4.2.
+Cayenne 5.0 is fully tested with Java 21 and 25.
 
 == Incompatible Changes