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From "Vincent Privat (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COLLECTIONS-593) Compilation errors (generics) with JDK9
Date Sun, 03 Jul 2016 18:56:10 GMT
Vincent Privat created COLLECTIONS-593:
------------------------------------------

             Summary: Compilation errors (generics) with JDK9
                 Key: COLLECTIONS-593
                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-593
             Project: Commons Collections
          Issue Type: Bug
    Affects Versions: 4.x
         Environment: Java 9b125
            Reporter: Vincent Privat


Current codebase does not compile with JDK9 (build 125): 28 errors below.

I am not sure if this is a bug of JDK9 of a stricter compilation rule with generics.

    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/BagUtils.java:98:
error: incompatible types: Bag<CAP#1> cannot be converted to Bag<E>
    [javac]         return UnmodifiableBag.unmodifiableBag(bag);
    [javac]                                               ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>unmodifiableBag(Bag<? extends
E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/CollectionUtils.java:795:
error: incompatible types: Collection<CAP#1> cannot be converted to Collection<C>
    [javac]                 final Collection<C> resultCollection = collect(collection,
transformer);
    [javac]                                                               ^
    [javac]   where C is a type-variable:
    [javac]     C extends Object declared in method <C>transform(Collection<C>,Transformer<?
super C,? extends C>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends C from capture of ? extends C
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/CollectionUtils.java:1835:
error: incompatible types: Collection<CAP#1> cannot be converted to Collection<C>
    [javac]         return UnmodifiableCollection.unmodifiableCollection(collection);
    [javac]                                                             ^
    [javac]   where C is a type-variable:
    [javac]     C extends Object declared in method <C>unmodifiableCollection(Collection<?
extends C>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends C from capture of ? extends C
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/FluentIterable.java:311:
error: incompatible types: FluentIterable<CAP#1> cannot be converted to FluentIterable<O>
    [javac]         return of(IterableUtils.transformedIterable(iterable, transformer));
    [javac]                  ^
    [javac]   where O,E are type-variables:
    [javac]     O extends Object declared in method <O>transform(Transformer<? super
E,? extends O>)
    [javac]     E extends Object declared in class FluentIterable
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O from capture of ? extends O
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IterableUtils.java:429:
error: incompatible types: Iterator<CAP#1> cannot be converted to Iterator<O>
    [javac]                 return IteratorUtils.transformedIterator(iterable.iterator(),
transformer);
    [javac]                                                         ^
    [javac]   where O,I are type-variables:
    [javac]     O extends Object declared in method <I,O>transformedIterable(Iterable<I>,Transformer<?
super I,? extends O>)
    [javac]     I extends Object declared in method <I,O>transformedIterable(Iterable<I>,Transformer<?
super I,? extends O>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O from capture of ? extends O
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IterableUtils.java:833:
error: no suitable method found for partition(Iterable<CAP#1>,Factory<List<O#1>>,Predicate<?
super O#1>[])
    [javac]         return partition(iterable, factory, predicates);
    [javac]                ^
    [javac]     method IterableUtils.<O#1>partition(Iterable<? extends O#1>,Predicate<?
super O#1>) is not applicable
    [javac]       (cannot infer type-variable(s) O#1
    [javac]         (actual and formal argument lists differ in length))
    [javac]     method IterableUtils.<O#2>partition(Iterable<? extends O#2>,Predicate<?
super O#2>...) is not applicable
    [javac]       (cannot infer type-variable(s) O#2
    [javac]         (varargs mismatch; Factory<List<O#1>> cannot be converted
to Predicate<? super O#2>))
    [javac]     method IterableUtils.<O#3,R>partition(Iterable<? extends O#3>,Factory<R>,Predicate<?
super O#3>...) is not applicable
    [javac]       (cannot infer type-variable(s) O#3,R
    [javac]         (varargs mismatch; Predicate<? super O#1>[] cannot be converted
to Predicate<? super O#3>))
    [javac]   where O#1,O#2,O#3,R are type-variables:
    [javac]     O#1 extends Object declared in method <O#1>partition(Iterable<? extends
O#1>,Predicate<? super O#1>)
    [javac]     O#2 extends Object declared in method <O#2>partition(Iterable<? extends
O#2>,Predicate<? super O#2>...)
    [javac]     O#3 extends Object declared in method <O#3,R>partition(Iterable<?
extends O#3>,Factory<R>,Predicate<? super O#3>...)
    [javac]     R extends Collection<O#3> declared in method <O#3,R>partition(Iterable<?
extends O#3>,Factory<R>,Predicate<? super O#3>...)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O#1 from capture of ? extends O#1
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IterableUtils.java:873:
error: no suitable method found for partition(Iterable<CAP#1>,Factory<List<O#1>>,Predicate<?
super O#1>[])
    [javac]         return partition(iterable, factory, predicates);
    [javac]                ^
    [javac]     method IterableUtils.<O#2>partition(Iterable<? extends O#2>,Predicate<?
super O#2>) is not applicable
    [javac]       (cannot infer type-variable(s) O#2
    [javac]         (actual and formal argument lists differ in length))
    [javac]     method IterableUtils.<O#1>partition(Iterable<? extends O#1>,Predicate<?
super O#1>...) is not applicable
    [javac]       (cannot infer type-variable(s) O#1
    [javac]         (varargs mismatch; Factory<List<O#1>> cannot be converted
to Predicate<? super O#1>))
    [javac]     method IterableUtils.<O#3,R>partition(Iterable<? extends O#3>,Factory<R>,Predicate<?
super O#3>...) is not applicable
    [javac]       (cannot infer type-variable(s) O#3,R
    [javac]         (varargs mismatch; Predicate<? super O#1>[] cannot be converted
to Predicate<? super O#3>))
    [javac]   where O#1,O#2,O#3,R are type-variables:
    [javac]     O#1 extends Object declared in method <O#1>partition(Iterable<? extends
O#1>,Predicate<? super O#1>...)
    [javac]     O#2 extends Object declared in method <O#2>partition(Iterable<? extends
O#2>,Predicate<? super O#2>)
    [javac]     O#3 extends Object declared in method <O#3,R>partition(Iterable<?
extends O#3>,Factory<R>,Predicate<? super O#3>...)
    [javac]     R extends Collection<O#3> declared in method <O#3,R>partition(Iterable<?
extends O#3>,Factory<R>,Predicate<? super O#3>...)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O#1 from capture of ? extends O#1
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IteratorUtils.java:438:
error: incompatible types: BoundedIterator<CAP#1> cannot be converted to BoundedIterator<E>
    [javac]         return boundedIterator(iterator, 0, max);
    [javac]                               ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>boundedIterator(Iterator<?
extends E>,long)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IteratorUtils.java:862:
error: incompatible types: PeekingIterator<CAP#1> cannot be converted to Iterator<E>
    [javac]         return PeekingIterator.peekingIterator(iterator);
    [javac]                                               ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>peekingIterator(Iterator<?
extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IteratorUtils.java:878:
error: incompatible types: PushbackIterator<CAP#1> cannot be converted to Iterator<E>
    [javac]         return PushbackIterator.pushbackIterator(iterator);
    [javac]                                                 ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>pushbackIterator(Iterator<?
extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IteratorUtils.java:1086:
error: incompatible types: List<CAP#1> cannot be converted to List<E>
    [javac]         final List<E> list = toList(iterator, 100);
    [javac]                                    ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>toArray(Iterator<? extends
E>,Class<E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/IteratorUtils.java:1104:
error: incompatible types: List<CAP#1> cannot be converted to List<E>
    [javac]         return toList(iterator, 10);
    [javac]                      ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>toList(Iterator<? extends
E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/ListUtils.java:394:
error: incompatible types: List<CAP#1> cannot be converted to List<E>
    [javac]         return UnmodifiableList.unmodifiableList(list);
    [javac]                                                 ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>unmodifiableList(List<? extends
E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/MapUtils.java:1272:
error: incompatible types: Map<CAP#1,CAP#2> cannot be converted to Map<K,V>
    [javac]         return UnmodifiableMap.unmodifiableMap(map);
    [javac]                                               ^
    [javac]   where K,V are type-variables:
    [javac]     K extends Object declared in method <K,V>unmodifiableMap(Map<? extends
K,? extends V>)
    [javac]     V extends Object declared in method <K,V>unmodifiableMap(Map<? extends
K,? extends V>)
    [javac]   where CAP#1,CAP#2 are fresh type-variables:
    [javac]     CAP#1 extends K from capture of ? extends K
    [javac]     CAP#2 extends V from capture of ? extends V
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/MapUtils.java:1537:
error: incompatible types: SortedMap<K,CAP#1> cannot be converted to SortedMap<K,V>
    [javac]         return UnmodifiableSortedMap.unmodifiableSortedMap(map);
    [javac]                                                           ^
    [javac]   where K,V are type-variables:
    [javac]     K extends Object declared in method <K,V>unmodifiableSortedMap(SortedMap<K,?
extends V>)
    [javac]     V extends Object declared in method <K,V>unmodifiableSortedMap(SortedMap<K,?
extends V>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends V from capture of ? extends V
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/MultiSetUtils.java:85:
error: incompatible types: MultiSet<CAP#1> cannot be converted to MultiSet<E>
    [javac]         return UnmodifiableMultiSet.unmodifiableMultiSet(multiset);
    [javac]                                                         ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>unmodifiableMultiSet(MultiSet<?
extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/PredicateUtils.java:537:
error: incompatible types: Predicate<CAP#1> cannot be converted to Predicate<T>
    [javac]         return TransformedPredicate.transformedPredicate(transformer, predicate);
    [javac]                                                         ^
    [javac]   where T is a type-variable:
    [javac]     T extends Object declared in method <T>transformedPredicate(Transformer<?
super T,? extends T>,Predicate<? super T>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends T from capture of ? extends T
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/QueueUtils.java:56:
error: incompatible types: Queue<CAP#1> cannot be converted to Queue<E>
    [javac]         return UnmodifiableQueue.unmodifiableQueue(queue);
    [javac]                                                   ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>unmodifiableQueue(Queue<?
extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/SetUtils.java:225:
error: incompatible types: Set<CAP#1> cannot be converted to Set<E>
    [javac]         return UnmodifiableSet.unmodifiableSet(set);
    [javac]                                               ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>unmodifiableSet(Set<? extends
E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/SetUtils.java:505:
error: incompatible types: Iterator<CAP#1> cannot be converted to Iterator<E>
    [javac]                 return IteratorUtils.filteredIterator(a.iterator(), notContainedInB);
    [javac]                                                      ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>difference(Set<? extends E>,Set<?
extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/SetUtils.java:543:
error: incompatible types: Iterator<CAP#1> cannot be converted to Iterator<E>
    [javac]                 return IteratorUtils.filteredIterator(a.iterator(), containedInB);
    [javac]                                                      ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in method <E>intersection(Set<? extends
E>,Set<? extends E>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/TransformerUtils.java:187:
error: incompatible types: no instance(s) of type variable(s) I#1 exist so that Transformer<I#1,CAP#1>
conforms to Transformer<I#2,O#2>
    [javac]         return FactoryTransformer.factoryTransformer(factory);
    [javac]                                                     ^
    [javac]   where I#1,O#1,O#2,I#2 are type-variables:
    [javac]     I#1 extends Object declared in method <I#1,O#1>factoryTransformer(Factory<?
extends O#1>)
    [javac]     O#1 extends Object declared in method <I#1,O#1>factoryTransformer(Factory<?
extends O#1>)
    [javac]     O#2 extends Object declared in method <I#2,O#2>asTransformer(Factory<?
extends O#2>)
    [javac]     I#2 extends Object declared in method <I#2,O#2>asTransformer(Factory<?
extends O#2>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O#2 from capture of ? extends O#2
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/TransformerUtils.java:235:
error: incompatible types: Transformer<CAP#1,CAP#1> cannot be converted to Transformer<T,T>
    [javac]         return IfTransformer.ifTransformer(predicate, trueTransformer);
    [javac]                                           ^
    [javac]   where T is a type-variable:
    [javac]     T extends Object declared in method <T>ifTransformer(Predicate<?
super T>,Transformer<? super T,? extends T>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends T from capture of ? extends T
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/TransformerUtils.java:428:
error: incompatible types: no instance(s) of type variable(s) I#1 exist so that Transformer<I#1,CAP#1>
conforms to Transformer<I#2,O#2>
    [javac]         return MapTransformer.mapTransformer(map);
    [javac]                                             ^
    [javac]   where I#1,O#1,O#2,I#2 are type-variables:
    [javac]     I#1 extends Object declared in method <I#1,O#1>mapTransformer(Map<?
super I#1,? extends O#1>)
    [javac]     O#1 extends Object declared in method <I#1,O#1>mapTransformer(Map<?
super I#1,? extends O#1>)
    [javac]     O#2 extends Object declared in method <I#2,O#2>mapTransformer(Map<?
super I#2,? extends O#2>)
    [javac]     I#2 extends Object declared in method <I#2,O#2>mapTransformer(Map<?
super I#2,? extends O#2>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends O#2 from capture of ? extends O#2
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/TrieUtils.java:46:
error: incompatible types: Trie<K,CAP#1> cannot be converted to Trie<K,V>
    [javac]         return UnmodifiableTrie.unmodifiableTrie(trie);
    [javac]                                                 ^
    [javac]   where K,V are type-variables:
    [javac]     K extends Object declared in method <K,V>unmodifiableTrie(Trie<K,?
extends V>)
    [javac]     V extends Object declared in method <K,V>unmodifiableTrie(Trie<K,?
extends V>)
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends V from capture of ? extends V
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/iterators/IteratorIterable.java:118:
error: incompatible types: Iterator<CAP#1> cannot be converted to Iterator<E>
    [javac]         this.typeSafeIterator = createTypesafeIterator(this.iterator);
    [javac]                                                       ^
    [javac]   where E is a type-variable:
    [javac]     E extends Object declared in class IteratorIterable
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends E from capture of ? extends E
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/collections4/multimap/TransformedMultiValuedMap.java:162:
error: incompatible types: FluentIterable<CAP#1> cannot be converted to Iterable<V>
    [javac]         final Iterable<V> transformedValues = FluentIterable.of(values).transform(valueTransformer);
    [javac]                                                                              
   ^
    [javac]   where V is a type-variable:
    [javac]     V extends Object declared in class TransformedMultiValuedMap
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends V from capture of ? extends V
    [javac] /var/lib/jenkins/jobs/Java-EarlyAccess-JOSM-Plugins/workspace/jdk/JDK9/apache-commons/src/org/apache/commons/imaging/util/Debug.java:125:
error: incompatible types: ArrayList<CAP#1> cannot be converted to List<Object>
    [javac]         final List<Object> keys = new ArrayList<>(map.keySet());
    [javac]                                   ^
    [javac]   where CAP#1 is a fresh type-variable:
    [javac]     CAP#1 extends Object from capture of ?
    [javac] 28 errors
    [javac] 1 warning



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