Upgrade Gradle wrapper to version 8.x.

[blackwinter]

Gradle 8.0 has been released, but the upgrade is blocked by xtext/xtext-gradle-plugin#204:

A problem occurred evaluating root project 'metafacture-fix'.
> Failed to apply plugin 'org.xtext.builder'.
   > Could not create task ':metafix:generateXtext'.
      > Cannot use @TaskAction annotation on method XtextGenerate.generate()
because interface org.gradle.api.tasks.incremental.IncrementalTaskInputs is not
a valid parameter to an action method.

This in turn (semi-)blocks the upgrade in Limetrans due to the inability to run its test matrix against metafacture-fix master.

[blackwinter]

The original issue (xtext/xtext-gradle-plugin#203) has been fixed by xtext/xtext-gradle-plugin#210, but the fix has not been officially released yet. Also, it raises the minimum Java version to 11 (while we're still on 1.8).

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The Xtext Builder plugin supports Gradle 8.0 since version 4.0.0.

This leaves us with the Java 11 requirement. Can we raise our minimum Java version as well?

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Raising the minimum Java version to 11 would make working on both metafacture-fix and metafacture-core in parallel more complicated since the latter's build is currently not compatible with Java 11:

diff --git build.gradle build.gradle
index 43fd477a..3974979b 100644
--- build.gradle
+++ build.gradle
@@ -31,7 +31,7 @@ subprojects {
       'guava': '29.0-jre',
       'jackson_databind': '2.15.1',
       'junit': '4.12',
-      'mockito': '2.5.7',
+      'mockito': '2.27.0',
       'slf4j': '1.7.36',
       'wiremock_jre': '2.35.0'
     ]
diff --git metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/pojo/ComplexTypeEncoder.java metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/pojo/ComplexTypeEncoder.java
index 3d32dde7..193928db 100644
--- metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/pojo/ComplexTypeEncoder.java
+++ metafacture-javaintegration/src/main/java/org/metafacture/javaintegration/pojo/ComplexTypeEncoder.java
@@ -43,7 +43,7 @@ class ComplexTypeEncoder implements TypeEncoder {

     private static Object createInstance(final Class<?> clazz) {
         try {
-            return clazz.newInstance();
+            return clazz.getDeclaredConstructor().newInstance();
         }
         catch (final Exception e) { // checkstyle-disable-line IllegalCatch
             throw new MetafactureException("Can't instantiate object of class: " + clazz, e);
diff --git metafacture-xml/src/main/java/org/metafacture/xml/XmlDecoder.java metafacture-xml/src/main/java/org/metafacture/xml/XmlDecoder.java
index ff0dac5e..1712c277 100644
--- metafacture-xml/src/main/java/org/metafacture/xml/XmlDecoder.java
+++ metafacture-xml/src/main/java/org/metafacture/xml/XmlDecoder.java
@@ -29,10 +29,11 @@
 import org.xml.sax.SAXNotRecognizedException;
 import org.xml.sax.SAXNotSupportedException;
 import org.xml.sax.XMLReader;
-import org.xml.sax.helpers.XMLReaderFactory;

 import java.io.IOException;
 import java.io.Reader;
+import javax.xml.parsers.ParserConfigurationException;
+import javax.xml.parsers.SAXParserFactory;

 /**
  * Reads an XML file and passes the XML events to a receiver.
@@ -56,9 +57,12 @@ public final class XmlDecoder extends DefaultObjectPipe<Reader, XmlReceiver> {
      */
     public XmlDecoder() {
         try {
-            saxReader = XMLReaderFactory.createXMLReader();
+            final SAXParserFactory parserFactory = SAXParserFactory.newInstance();
+            parserFactory.setNamespaceAware(true);
+
+            saxReader = parserFactory.newSAXParser().getXMLReader();
         }
-        catch (final SAXException e) {
+        catch (final ParserConfigurationException | SAXException e) {
             throw new MetafactureException(e);
         }
     }

> Task :metamorph:test

org.metafacture.metamorph.functions.ScriptTest > shouldExecuteJavascriptFunctions STANDARD_ERROR
    Warning: Nashorn engine is planned to be removed from a future JDK release
    Warning: Nashorn engine is planned to be removed from a future JDK release

[blackwinter]

Our version of the Editorconfig Gradle plugin is not compatible with Gradle 8.x. However, upgrading to a compatible version (0.1.0) would raise the minimum Java version to 16, which in turn is not compatible with metafacture-core's Gradle version (6.0; see also metafacture/metafacture-core#484).

So instead, I propose that we disable the Editorconfig plugin until such time as either a Java 11 compatible version gets released or we're comfortable with switching to Java 17 (LTS). We still have editorconfig-checker as an alternative (see #179).