Java newInstance 在不应该抛出错误的地方抛出错误

Question

我目前正在为自己编写一个私有(private) Java API，它使用 Class允许扩展 API 的特定部分(统计数据保存部分)而不改变底层用法。我喜欢这种方法，但由于某种原因，每当 API 尝试执行 theClass.newInstance() 时， ，它会抛出如下错误:

java.lang.IllegalAccessError: tried to access method me.duper51.DuperFramework.utils.player.StatsObject.<init>()V from class me.duper51.Skyrings.stats.SkyringsStats
    at me.duper51.Skyrings.stats.SkyringsStats.<init>(SkyringsStats.java:14) ~[?:?]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_131]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_131]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_131]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_131]
    at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_131]
    at me.duper51.DuperFramework.utils.player.PlaygroundPlayer.getStats(PlaygroundPlayer.java:71) ~[?:?]
    at me.duper51.Skyrings.listeners.GameListener.lambda$getReplacements$0(GameListener.java:65) ~[?:?]
    at me.duper51.DuperFramework.utils.scoreboard.SidebarOption.update(SidebarOption.java:44) ~[?:?]
    at me.duper51.DuperFramework.utils.scoreboard.SidebarOption.update(SidebarOption.java:53) ~[?:?]
    at me.duper51.DuperFramework.utils.scoreboard.SidebarManager.updateAll(SidebarManager.java:75) ~[?:?]
    at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
    at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-21fe707-e1ebe52]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]

哪里me.duper51.Skyrings.stats.SkyringsStats是扩展类，并且 me.duper51.DuperFramework.utils.player.StatsObject是基类。

扩展对象如下所示:

public class SkyringsStats extends StatsObject {
public SkyringsStats() {
    super();
}

private int kills = 0;
private int wins = 0;
private int totalPlays = 0;
private int deaths = 0;
public void incrementKills() {
    kills++;
}
public void incrementDeaths() {
    deaths++;
}
public void incrementTotalPlays() {
    totalPlays++;
}
public void incrementWins() {
    wins++;
}

public int getKills() {
    return kills;
}

public int getWins() {
    return kills;
}

public int getDeaths() {
    return kills;
}

public int getGamesPlayed() {
    return kills;
}

}

根据另一个答案的要求，这是 javap -p me.duper51.DuperFramework.utils.player.StatsObject 的输出

Compiled from "StatsObject.java"
public class me.duper51.DuperFramework.utils.player.StatsObject {
  private java.util.UUID pUUID;
  public me.duper51.DuperFramework.utils.player.StatsObject();
  void setpUUID(java.util.UUID);
  public void commitChanges(me.duper51.DuperFramework.GamePlugin);
  private static void lambda$commitChanges$0();
}

Answer 1

StatsObject 的默认构造函数是私有(private)的或无法访问的，并且自编译此代码以来必须如此。