Make tests pass by ignoring jar-file-related classes

pom.xml

@@ -271,6 +271,9 @@
                         --add-opens java.base/jdk.internal.misc=ALL-UNNAMED
                         --add-opens java.base/jdk.internal.loader=ALL-UNNAMED
                         --add-opens java.base/jdk.internal.ref=ALL-UNNAMED
+                        --add-opens java.base/jdk.internal.util=ALL-UNNAMED
+                        --add-opens java.base/jdk.internal.util.jar=ALL-UNNAMED
+                        --add-opens java.base/jdk.internal.module=ALL-UNNAMED
                     </argLine>
                     <!-- Jenkins needs XML test reports to determine whether the build is stable. -->
                     <disableXmlReport>false</disableXmlReport>

src/test/java/org/opentripplanner/routing/graph/GraphSerializationTest.java

@@ -13,10 +13,13 @@
 import org.opentripplanner.routing.vertextype.TransitStation;
 
 import java.io.File;
+import java.io.RandomAccessFile;
+import java.lang.ref.Cleaner;
 import java.lang.reflect.Method;
 import java.util.BitSet;
 import java.util.List;
 import java.util.concurrent.ThreadPoolExecutor;
+import java.util.jar.JarFile;
 import java.util.stream.Collectors;
 
 import static org.junit.Assert.assertFalse;
@@ -88,8 +91,8 @@ public void compareGraphToItself () {
         objectDiffer.ignoreFields("incoming", "outgoing");
         objectDiffer.useEquals(BitSet.class, LineString.class, Polygon.class);
         // ThreadPoolExecutor contains a weak reference to a very deep chain of Finalizer instances.
-        // Method instances usually are part of a proxy which is totally un-reflectable in Java 11
-        objectDiffer.ignoreClasses(WeakValueHashMap.class, ThreadPoolExecutor.class, Method.class);
+        // Method instances usually are part of a proxy which are totally un-reflectable in Java 11
+        objectDiffer.ignoreClasses(WeakValueHashMap.class, ThreadPoolExecutor.class, Method.class, JarFile.class);
         // This setting is critical to perform a deep test of an object against itself.
         objectDiffer.enableComparingIdenticalObjects();
         objectDiffer.compareTwoObjects(originalGraph, originalGraph);