[COLLECTIONS-849] Compilation with Java 21 fails with "error: addFirst(E#1) in AbstractLinkedList cannot implement addFirst(E#2) in List"

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.2.2, 4.4
• Component/s: Core
• Assignee: Unassigned
• Reporter: Volkmar W. Pogatzki
• Created: 10/Nov/23 21:35
• Updated: 28/Mar/24 13:49
• Resolved: 28/Mar/24 13:49

Description

javac -source 1.8 -target 1.8 -d target/classes -encoding UTF-8 @sources.lst
warning: [options] bootstrap class path not set in conjunction with -source 8
warning: [options] source value 8 is obsolete and will be removed in a future release
warning: [options] target value 8 is obsolete and will be removed in a future release
warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
src/main/java/org/apache/commons/collections4/trie/AbstractPatriciaTrie.java:1158: error: lastEntry() in AbstractPatriciaTrie cannot implement lastEntry() in SequencedMap
TrieEntry<K, V> lastEntry() {
^
attempting to assign weaker access privileges; was public
where K#1,V#1,K#2,V#2 are type-variables:
K#1 extends Object declared in class AbstractPatriciaTrie
V#1 extends Object declared in class AbstractPatriciaTrie
K#2 extends Object declared in interface SequencedMap
V#2 extends Object declared in interface SequencedMap
src/main/java/org/apache/commons/collections4/trie/AbstractPatriciaTrie.java:744: error: firstEntry() in AbstractPatriciaTrie cannot implement firstEntry() in SequencedMap
TrieEntry<K, V> firstEntry() {
^
attempting to assign weaker access privileges; was public
where K#1,V#1,K#2,V#2 are type-variables:
K#1 extends Object declared in class AbstractPatriciaTrie
V#1 extends Object declared in class AbstractPatriciaTrie
K#2 extends Object declared in interface SequencedMap
V#2 extends Object declared in interface SequencedMap
src/main/java/org/apache/commons/collections4/trie/PatriciaTrie.java:65: error: lastEntry() in AbstractPatriciaTrie cannot implement lastEntry() in SequencedMap
public class PatriciaTrie<V> extends AbstractPatriciaTrie<String, V> {
^
attempting to assign weaker access privileges; was public
where K#1,V#1,K#2,V#2 are type-variables:
K#1 extends Object declared in class AbstractPatriciaTrie
V#1 extends Object declared in class AbstractPatriciaTrie
K#2 extends Object declared in interface SequencedMap
V#2 extends Object declared in interface SequencedMap
src/main/java/org/apache/commons/collections4/list/AbstractLinkedList.java:340: error: addLast(E#1) in AbstractLinkedList cannot implement addLast(E#2) in List
public boolean addLast(final E o) {
^
return type boolean is not compatible with void
where E#1,E#2 are type-variables:
E#1 extends Object declared in class AbstractLinkedList
E#2 extends Object declared in interface List
src/main/java/org/apache/commons/collections4/list/AbstractLinkedList.java:335: error: addFirst(E#1) in AbstractLinkedList cannot implement addFirst(E#2) in List
public boolean addFirst(final E o) {
^
return type boolean is not compatible with void
where E#1,E#2 are type-variables:
E#1 extends Object declared in class AbstractLinkedList
E#2 extends Object declared in interface List
src/main/java/org/apache/commons/collections4/list/NodeCachingLinkedList.java:44: error: addLast(E#1) in AbstractLinkedList cannot implement addLast(E#2) in List
public class NodeCachingLinkedList<E> extends AbstractLinkedList<E> implements Serializable {
^
return type boolean is not compatible with void
where E#1,E#2 are type-variables:
E#1 extends Object declared in class AbstractLinkedList
E#2 extends Object declared in interface List
src/main/java/org/apache/commons/collections4/list/CursorableLinkedList.java:61: error: addLast(E#1) in AbstractLinkedList cannot implement addLast(E#2) in List
public class CursorableLinkedList<E> extends AbstractLinkedList<E> implements Serializable {
^
return type boolean is not compatible with void
where E#1,E#2 are type-variables:
E#1 extends Object declared in class AbstractLinkedList
E#2 extends Object declared in interface List
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
7 errors

Issue Links

• is related to: COLLECTIONS-842 AbstractLinkedList incompatible with JDK 21's java.util.List