re-enable jdk9 collections support.

value-fixture/test-java-11/org/immutables/fixture/nullable/NullableAttributesTest.java

@@ -349,7 +349,13 @@ public void nullValuesInJdkMapErrorMsg() {
     try {
       ImmutableEntityWithMap.builder().properties(new HashMap<>()).build().withProperties(properties);
     } catch (NullPointerException e) {
-      check(e.getMessage()).is("value for key: b");
+      boolean isJava8 = System.getProperty("java.version").startsWith("1.8");
+      if (isJava8) {
+        check(e.getMessage()).is("properties value for key: b");
+      } else {
+        // Java 9+ copy methods NPE has no message
+        check(e.getMessage()).isNull();
+      }
     }
     try {
       ImmutableEntityWithMap.builder().putAllProperties(properties).build();

value-fixture/test/org/immutables/fixture/jackson/ObjectMappedTest.java

@@ -17,6 +17,7 @@
 
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import com.fasterxml.jackson.datatype.guava.GuavaModule;
 import java.io.IOException;
@@ -27,7 +28,8 @@
 public class ObjectMappedTest {
   private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
   {
-    OBJECT_MAPPER.registerModule(new GuavaModule());
+    OBJECT_MAPPER.registerModule(new GuavaModule())
+        .enable(SerializationFeature.ORDER_MAP_ENTRIES_BY_KEYS);
   }
 
   public static class Wrapper {

value-fixture/test/org/immutables/fixture/jdkonly/JdkOnlyTest.java

@@ -48,10 +48,10 @@ public void collections() {
         .addPols(RetentionPolicy.RUNTIME, RetentionPolicy.RUNTIME)
         .build();
 
-    check(coll.ints()).isOf(1, 2, 3, 4, 5, 6);
-    check(coll.navs()).isOf(3, 2, 1);
-    check(coll.ords()).isOf(4, 5, 6, 7, 8, 9);
-    check(coll.pols()).isOf(RetentionPolicy.RUNTIME);
+    check(coll.ints()).hasContentInAnyOrder(1, 2, 3, 4, 5, 6);
+    check(coll.navs()).hasContentInAnyOrder(3, 2, 1);
+    check(coll.ords()).hasContentInAnyOrder(4, 5, 6, 7, 8, 9);
+    check(coll.pols()).hasContentInAnyOrder(RetentionPolicy.RUNTIME);
   }
 
   @Test
@@ -111,9 +111,9 @@ public void maps() {
         .putAllOrds(ImmutableMap.of(2, "2", 1, "1"))
         .build();
 
-    check(maps.navs().keySet()).isOf("33", "22");
-    check(maps.just().keySet()).isOf(1L, 2L);
-    check(maps.ords().keySet()).isOf(1, 2);
+    check(maps.navs().keySet()).hasContentInAnyOrder("33", "22");
+    check(maps.just().keySet()).hasContentInAnyOrder(1L, 2L);
+    check(maps.ords().keySet()).hasContentInAnyOrder(1, 2);
   }
 
   @Test

value-processor/src/org/immutables/value/processor/Immutables.generator

@@ -2442,8 +2442,13 @@ return [type.factoryOf]([output.linesShortable][for v in type.settableAttributes
   [if v.nullable][expression][else][expression].clone()[/if]
 [else if v.attributeValueKindCopy]
   [if v.nullable][expression] == null ? null : [/if][deepCopyOf v][expression][/deepCopyOf]
-[else if v.collectionType or v.mapType]
+[else if v.mapType]
   [if v.nullable][expression] == null ? null : [/if][immutableCollectionCopyOf v expression]
+[else if v.collectionType]
+  [if v.nullable][expression] == null ? null : [/if][if v.isGenerateJdk9][expression] instanceof java.util.Collection<?>
+       ? java.util.[v.rawCollectionType].copyOf((java.util.Collection<[v.consumedElementType]>) [expression])
+       : java.util.stream.StreamSupport.stream([expression].spliterator(), false)
+             .collect(java.util.stream.Collectors.toUnmodifiable[v.rawCollectionType]())[else][immutableCollectionCopyOf v expression][/if]
 [else]
   [maybeCopyOf v][maybeNonNullValue v][expression][/maybeNonNullValue][/maybeCopyOf]
 [/if]

value-processor/src/org/immutables/value/processor/meta/ValueType.java

@@ -275,11 +275,8 @@ public boolean isGenerateJdkOnly() {
     return style().jdkOnly() || noGuavaInClasspath();
   }
 
-  // Until we can fix copy constructors generation for new Java9 collections
-  private static final boolean java9CollectionsEnabled = Boolean.getBoolean("immutables.java9-collections");
-
   public boolean isGenerateJdk9() {
-    return java9CollectionsEnabled && constitution.protoclass().environment().hasJava9Collections();
+    return constitution.protoclass().environment().hasJava9Collections();
   }
 
   public boolean isGenerateBuildOrThrow() {
@@ -1162,12 +1159,10 @@ public boolean apply(ValueAttribute attribute) {
           && !attribute.isGuavaImmutableDeclared();
       if (def) {
         switch (kind) {
-        case MAP:
-        case LIST:
-        case SET:
-          return !attribute.isGenerateJdk9();
-        default:
-          return true;
+          case MAP:
+            return !attribute.isGenerateJdk9();
+          default:
+            return true;
         }
       }
       return false;
@@ -1867,7 +1862,7 @@ public Reporter report() {
   public List<String> getDebugLines() {
     return constitution.protoclass().getDebugLines();
   }
-  
+
   public boolean isDataInline() {
     return DataInlineMirror.isPresent(element);
   }