Bump Java version to 21

Author: mizdebsk

.github/workflows/Dockerfile

@@ -17,12 +17,12 @@
 FROM registry.fedoraproject.org/fedora:rawhide
 
 ENV LC_ALL=C.utf8 \
-    JAVA_HOME=/usr/lib/jvm/java-17
+    JAVA_HOME=/usr/lib/jvm/java-21
 
 RUN dnf -y update \
  && dnf -y install git-core \
                    unzip \
-                   java-17-devel \
+                   java-21-devel \
                    byaccj \
                    gcc \
                    rpm-devel \

README.md

@@ -156,7 +156,7 @@ directory with patched upstream sources that are ready to be built.
 
 Modules are built by executing `./mbi.sh build` command. It allows the
 environment variable `JAVA_HOME` to be set and pointed to JDK installation
-which will be used (e. g. `/usr/lib/jvm/java-17`). The minimal required
+which will be used (e. g. `/usr/lib/jvm/java-21`). The minimal required
 version of JDK is 17.
 
 The `build` command accepts a few options:
@@ -177,7 +177,7 @@ that allow you to control the shape and the location of binary
 distribution:
 
 * `-javaCmdPath` points to `java` executable, for use in launcher
-  shebangs (defaults to `/usr/lib/jvm/java-17`).
+  shebangs (defaults to `/usr/lib/jvm/java-21`).
 
 * `-installRoot` specifies directory into which distribution will be
   installed (equivalent to `$RPM_BUILD_ROOT` in RPM build), by default

mbi/core/src/org/fedoraproject/mbi/dist/DistCommand.java

@@ -42,7 +42,7 @@ public void run()
         Path workDir = reactor.getTargetDir( distModule ).resolve( "dist-work" );
         Util.delete( workDir );
 
-        String javaCmdPath = getOption( "javaCmdPath", "/usr/lib/jvm/java-17/bin/java" );
+        String javaCmdPath = getOption( "javaCmdPath", "/usr/lib/jvm/java-21/bin/java" );
         String basePackageName = getOption( "basePackageName", "mbi" );
         String installRoot = getOption( "installRoot", "/" );
         String mavenHomePath = getOption( "mavenHomePath", "/opt/mbi/maven" );