我从事一个相当复杂的项目已经有一段时间了。它包括两个模块， net.lightbluefoxlabs.dev.multirealm.core.multirealmcore 以及 net.lbflabs.dev.realms.survivalrealm ，其中第一个类有一个抽象类，而抽象类本身是从另一个类派生的（也许这就是问题所在？）。尝试为类创建服务时，出现以下错误： java.util.ServiceConfigurationError: net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.LoadedRealmPlugin: net.lbflabs.dev.realms.survivalrealm.SurvivalRealm not a subtype 即使它确实扩展了正确的类。下面是加载服务的代码：

File file = new File("Dir/plugin_jar.jar");
URLClassLoader c = new URLClassLoader(new URL[]{file.getAbsoluteFile().toURI().toURL()});
ServiceLoader<LoadedRealmPlugin> loader = ServiceLoader.load(LoadedRealmPlugin.class, c);
LoadedRealmPlugin p = loader.iterator().next(); // Throws the exception
return p;

我已经简化了类和包/模块的名称，因为我的项目已经相当大了，我不认为这是必要的。如果您需要任何其他信息，请询问。
编辑：stacktrace

[13:08:24] [Thread-9/WARN]: Exception in thread "Thread-9" java.util.ServiceConfigurationError: net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.LoadedRealmPlugin: net.lbflabs.dev.realms.survivalrealm.SurvivalRealm not a subtype
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader.fail(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader$2.next(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader$2.next(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at java.base/java.util.ServiceLoader$3.next(Unknown Source)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.LoadedRealmPlugin.RealmFactory(LoadedRealmPlugin.java:22)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.LoadedRealmPlugin.RealmFactory(LoadedRealmPlugin.java:32)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.UnloadedRealm.GetLoadedRealm(UnloadedRealm.java:25)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.UnloadedRealm.Load(UnloadedRealm.java:39)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.RealmBase.Initialize(RealmBase.java:33)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.RealmBase.<init>(RealmBase.java:25)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.UnloadedRealm.<init>(UnloadedRealm.java:18)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.RealmManager.Initialize(RealmManager.java:25)
[13:08:24] [Thread-9/WARN]:     at net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.Realms.RealmManager.lambda$InitializeAsync$0(RealmManager.java:42)
[13:08:24] [Thread-9/WARN]:     at java.base/java.lang.Thread.run(Unknown Source)

请注意，a.servicetemplate是net.lightbluefoxlabs.dev.multirealm.core.multirealmcore.realms.loadedrealmplagin，b.serviceprovider是 net.lbflabs.dev.realms.survivalrealm.SurvivalRealm