Require Java 11+ instead of Java 17+

.classpath

@@ -26,7 +26,7 @@
 			<attribute name="optional" value="true"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11">
 		<attributes>
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>

.github/workflows/build.yml

@@ -41,10 +41,10 @@ jobs:
         name: Checkout
         uses: actions/checkout@v3
       -
-        name: Set up JDK 17
+        name: Set up JDK 11
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
+          java-version: '11'
           distribution: temurin
           cache: maven
       -

README.md

@@ -14,7 +14,7 @@ In order to solve this problem, you can use the [`concrete-cif.jar` app](https:/
 
 ## Using `concrete-cif.jar`
 
-1. Install Java (at least version 17). If you don't know how to do that, take a look at [Eclipse Temurin](https://adoptium.net/))
+1. Install Java (at least version 11). If you don't know how to do that, take a look at [Eclipse Temurin](https://adoptium.net/))
 2. [Download](https://github.com/concretecms/concrete-cif/releases/latest/download/concrete-cif.jar) the latest version
 3. Call concrete-cif.jar by passing it the files (or the directories) you want to check.  
    For example:
@@ -24,7 +24,7 @@ In order to solve this problem, you can use the [`concrete-cif.jar` app](https:/
 
 ## Compiling `concrete-cif.jar`
 
-1. You need a Java JDK (at least 17) - see for example [Eclipse Temurin](https://adoptium.net/)
+1. You need a Java JDK (at least 11) - see for example [Eclipse Temurin](https://adoptium.net/)
 2. You need [Apache Maven](https://maven.apache.org/)
 3. You need to download Xerces locally by using the `bin/install-xerces-m2.sh` script (on Windows: `bin\install-xerces-m2.bat` or `bin\install-xerces-m2.ps1`)
 4. Run `mvn verify`

pom.xml

@@ -10,8 +10,8 @@
 	<url>https://github.com/concretecms/concrete-cif</url>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<maven.compiler.source>17</maven.compiler.source>
-		<maven.compiler.target>17</maven.compiler.target>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
 	</properties>
 	<dependencyManagement>
 		<dependencies>