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https://issues.apache.org/jira/browse/COLLECTIONS-849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17785154#comment-17785154
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Alex Herbert commented on COLLECTIONS-849:
------------------------------------------
This is a duplicate of COLLECTIONS-842.
Due to this issue Collections4 is not source compatible with JDK 21.
> Compilation with Java 21 fails with "error: addFirst(E#1) in
> AbstractLinkedList cannot implement addFirst(E#2) in List"
> -----------------------------------------------------------------------------------------------------------------------
>
> Key: COLLECTIONS-849
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-849
> Project: Commons Collections
> Issue Type: Bug
> Components: Core
> Affects Versions: 3.2.2, 4.4
> Reporter: Volkmar W. Pogatzki
> Priority: Major
> Attachments: build.log
>
>
> 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 warning: [options] source value 8 is obsolete and will be removed in a future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 warning: [options] target value 8 is obsolete and will be removed in a future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
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