Why can't JDK11 compile successfully?

[otary]

PS C:\Users\chenzw\IdeaProjects\gitlab4j-api> java --version
openjdk 11.0.2 2019-01-15
OpenJDK Runtime Environment 18.9 (build 11.0.2+9)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.2+9, mixed mode)
PS C:\Users\chenzw\IdeaProjects\gitlab4j-api> .\gradlew.bat build
Starting a Gradle Daemon, 4 incompatible and 1 stopped Daemons could not be reused, use --status for details

> Task :gitlab4j-api:compileJava
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:957: 错误: 需要class, interface或enum
    public List<Contributor> getContributors(Object projectIdOrPath) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:959: 错误: 需要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:972: 错误: 需要class, interface或enum
    public List<Contributor> getContributors(Object projectIdOrPath, int page, int perPage) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:980: 错误: 需要class, interface或enum
        return (response.readEntity(new GenericType<List<Contributor>>() {}));
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:981: 错误: 需要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:996: 错误: 需要class, interface或enum
    public List<Contributor> getContributors(
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1000: 错误: 需 要class, interface或enum
        if (sortOrder != null) {
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1002: 错误: 需 要class, interface或enum
        }
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1006: 错误: 需 要class, interface或enum
        }
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1015: 错误: 需 要class, interface或enum
        return (response.readEntity(new GenericType<List<Contributor>>() {}));
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1016: 错误: 需 要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1028: 错误: 需 要class, interface或enum
    public Pager<Contributor> getContributors(Object projectIdOrPath, int itemsPerPage) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1031: 错误: 需 要<标识符>
                Contributor.class,
                                 ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1049: 错误: 需 要class, interface或enum
    public Stream<Contributor> getContributorsStream(Object projectIdOrPath) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1051: 错误: 需 要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1063: 错误: 需 要class, interface或enum
    public Commit getMergeBase(Object projectIdOrPath, List<String> refs) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1067: 错误: 需 要class, interface或enum
        }
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1070: 错误: 需 要class, interface或enum
        for (String ref : refs) {
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1072: 错误: 需 要class, interface或enum
        }
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1075: 错误: 需 要class, interface或enum
        Response response = get(
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1082: 错误: 需 要class, interface或enum
        return (response.readEntity(Commit.class));
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1082: 错误: 需 要<标识符>
        return (response.readEntity(Commit.class));
                                                ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1096: 错误: 需 要class, interface或enum
    public Optional<Commit> getOptionalMergeBase(Object projectIdOrPath, List<String> refs) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1099: 错误: 需 要class, interface或enum
        } catch (GitLabApiException glae) {
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1101: 错误: 需 要class, interface或enum
        }
        ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1113: 错误: 需 要class, interface或enum
    public void deleteMergedBranches(Object projectIdOrPath) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1121: 错误: 需 要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1132: 错误: 需 要class, interface或enum
    public void generateChangelog(Object projectIdOrPath, String version) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1134: 错误: 需 要class, interface或enum
    }
    ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1145: 错误: 需 要class, interface或enum
    public void generateChangelog(Object projectIdOrPath, ChangelogPayload payload) throws GitLabApiException {
           ^
C:\Users\chenzw\IdeaProjects\gitlab4j-api\gitlab4j-api\src\main\java\org\gitlab4j\api\RepositoryApi.java:1153: 错误: 需 要class, interface或enum
    }
    ^
31 个错误

> Task :gitlab4j-api:compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':gitlab4j-api:compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

See https://docs.gradle.org/7.6.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 19s
2 actionable tasks: 1 executed, 1 up-to-date