[build] always compile against default jruby; but run tests with designated version

Author: chadlwilson

.github/workflows/maven.yml

@@ -9,7 +9,7 @@ on:
 env:
   # Default versions for canonical release build
   DEFAULT_JAVA_VERSION: '8'
-  DEFAULT_JRUBY_VERSION: '9.4.14.0' # Should match pom.xml <jruby.version> property (AND a version inside the test matrix)
+  DEFAULT_JRUBY_VERSION: '9.4.14.0' # Should match pom.xml <jruby.compat.version> property (AND a version inside the test matrix)
   DEFAULT_RACK_VERSION: '~> 2.2.0' # Should match Gemfile (AND a version inside the test matrix)
 
 jobs:
@@ -42,7 +42,7 @@ jobs:
         cache: maven
 
     - name: Build with Maven
-      run: ./mvnw -B install -Djruby.version=${{ matrix.jruby_version }}
+      run: ./mvnw -B install -Djruby.test.version=${{ matrix.jruby_version }}
       env:
         RACK_VERSION: ${{ matrix.rack_version }}
 
@@ -79,7 +79,6 @@ jobs:
 
     env:
       BUNDLE_GEMFILE: gemfiles/${{ matrix.appraisal }}.gemfile
-      JRUBY_VERSION: ${{ matrix.jruby_version }}
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

Rakefile

@@ -38,14 +38,14 @@ directory 'target/classes'
 
 desc "Compile classes"
 task(:compile => 'target/classes') do
-  sh "./mvnw compile #{ENV['JRUBY_VERSION'] ? "-Djruby.version=#{ENV['JRUBY_VERSION']}" : ""}"
+  sh "./mvnw compile"
 end
 
 directory 'target/test-classes'
 
 desc "Compile test classes"
 task(:test_prepare => ['target/classes', 'target/test-classes']) do
-  sh "./mvnw test-compile #{ENV['JRUBY_VERSION'] ? "-Djruby.version=#{ENV['JRUBY_VERSION']}" : ""}"
+  sh "./mvnw test-compile"
 end
 
 desc "Unpack the rack gem"

pom.xml

@@ -21,7 +21,11 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <jruby.version>9.4.14.0</jruby.version>
+    <!-- Version to target at compile time -->
+    <jruby.compat.version>9.4.14.0</jruby.compat.version>
+    <!-- Version to execute tests with -->
+    <jruby.test.version>${jruby.compat.version}</jruby.test.version>
+
     <jruby.maven.plugins.version>3.0.6</jruby.maven.plugins.version>
     <gem.home>${project.build.directory}/rubygems</gem.home>
     <slf4j.version>2.0.17</slf4j.version>
@@ -79,7 +83,7 @@
       <!-- This has to be jruby-complete, as bundler-maven-plugin has special logic to exclude jruby-complete - otherwise
            it conflicts with the bootclasspath if using different "target compile version" to "runtime version" -->
       <artifactId>jruby-complete</artifactId>
-      <version>${jruby.version}</version>
+      <version>${jruby.compat.version}</version>
       <scope>provided</scope>
     </dependency>
     <dependency>
@@ -243,7 +247,7 @@
             <phase>test</phase>
             <goals><goal>install</goal></goals>
             <configuration>
-              <jrubyVersion>${jruby.version}</jrubyVersion>
+              <jrubyVersion>${jruby.test.version}</jrubyVersion>
               <local>false</local>
               <quiet>false</quiet>
             </configuration>
@@ -255,7 +259,7 @@
         <artifactId>rake-maven-plugin</artifactId>
         <version>${jruby.maven.plugins.version}</version>
         <configuration>
-          <jrubyVersion>${jruby.version}</jrubyVersion>
+          <jrubyVersion>${jruby.test.version}</jrubyVersion>
         </configuration>
         <executions>
           <execution>