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我從使用下面的仿製藥獲得一個的StackOverflowError：Java泛型 - ＃1
點：
package me.expdev.gkitpvp;
/*
* Project created by ExpDev
*/
import me.expdev.gkitpvp.persist.json.JSONPoints;
public abstract class Points {
private static Points instance = getPointsImpl();
public static Points getInstance() {
return instance;
}
private static Points getPointsImpl() {
return new JSONPoints();
}
public abstract GLocation getSpawn();
public abstract void setSpawn(GLocation loc);
public abstract GLocation getPoint(String id);
public abstract void addPoint(String id, GLocation loc);
public abstract void removePoint(String id);
// LOAD
public abstract void loadAll();
// SAVE
public abstract void forceSaveAll();
}
MemoryPoints擴展點：
package me.expdev.gkitpvp.persist;
import me.expdev.gkitpvp.GLocation;
import me.expdev.gkitpvp.Points;
import java.util.Map;
import java.util.concurrent.ConcurrentSkipListMap;
/**
* Project created by ExpDev
*/
public abstract class MemoryPoints extends Points {
public GLocation spawn = null;
public Map<String, GLocation> points = new ConcurrentSkipListMap<String, GLocation>(String.CASE_INSENSITIVE_ORDER);
public GLocation getSpawn() {
return spawn;
}
public void setSpawn(GLocation spawn) {
this.spawn = spawn;
}
public GLocation getPoint(String id) {
return points.get(id);
}
public void addPoint(String id, GLocation where) {
points.put(id, where);
}
public void removePoint(String id) {
points.remove(id);
}
// LOAD
@Override
public abstract void loadAll();
// SAVE
@Override
public abstract void forceSaveAll();
}
JSONPoints延伸MemoryPoints：
package me.expdev.gkitpvp.persist.json;
import me.expdev.gkitpvp.persist.MemoryPoints;
/*
* Project created by ExpDev
*/
public class JSONPoints extends MemoryPoints {
private JSONSpawn jsonSpawn;
private JSONRandomPoints jsonRandomPoints;
public JSONPoints() {
this.jsonSpawn = new JSONSpawn();
this.jsonRandomPoints = new JSONRandomPoints();
}
// LOADING
@Override
public void loadAll() {
jsonSpawn.load();
jsonRandomPoints.load();
}
// SAVING
@Override
public void forceSaveAll() {
jsonSpawn.forceSave();
jsonRandomPoints.forceSave();
}
}
JSONSpawn延長JSONPoints： https://pastebin.com/sgswhBEH
package me.expdev.gkitpvp.persist.json;
import com.google.gson.Gson;
import me.expdev.gkitpvp.GKitPvPPlugin;
import me.expdev.gkitpvp.GLocation;
import me.expdev.gkitpvp.utils.DiscUtil;
import java.io.File;
/**
* Project created by ExpDev
*/
public class JSONSpawn extends JSONPoints {
// Info on how to persist
private Gson gson;
private File file;
public JSONSpawn() {
file = new File(GKitPvPPlugin.p.getDataFolder(), "spawn.json");
gson = GKitPvPPlugin.gson;
}
public Gson getGson() {
return gson;
}
public void setGson(Gson gson) {
this.gson = gson;
}
public void forceSave() {
forceSave(true);
}
public void forceSave(boolean sync) {
saveCore(file, this.spawn, sync);
}
private boolean saveCore(File target, GLocation data, boolean sync) {
return DiscUtil.writeCatch(target, this.gson.toJson(data), sync);
}
public void load() {
GLocation spawn = this.loadCore();
if (spawn == null) {
return;
}
this.spawn = spawn;
GKitPvPPlugin.p.log("Loaded spawn.");
}
private GLocation loadCore() {
if (!this.file.exists()) {
return null;
}
String content = DiscUtil.readCatch(this.file);
if (content == null) {
return null;
}
GLocation data = this.gson.fromJson(content, GLocation.class);
saveCore(this.file, data, true); // Update the flatfile
return data;
}
}
JSONRandomPoints延伸JSONPoints： https://pastebin.com/C7bEvkxc
package me.expdev.gkitpvp.persist.json;
/*
* Project created by ExpDev
*/
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import me.expdev.gkitpvp.GKitPvPPlugin;
import me.expdev.gkitpvp.GLocation;
import me.expdev.gkitpvp.utils.DiscUtil;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
public class JSONRandomPoints extends JSONPoints {
// Info on how to persist
private Gson gson;
private File file;
public JSONRandomPoints() {
file = new File(GKitPvPPlugin.p.getDataFolder(), "points.json");
gson = GKitPvPPlugin.gson;
}
public Gson getGson() {
return gson;
}
public void setGson(Gson gson) {
this.gson = gson;
}
public void forceSave() {
forceSave(true);
}
public void forceSave(boolean sync) {
saveCore(file, this.points, sync);
}
private boolean saveCore(File target, Map<String, GLocation> data, boolean sync) {
return DiscUtil.writeCatch(target, this.gson.toJson(data), sync);
}
public void load() {
Map<String, GLocation> points = this.loadCore();
if (points == null) {
return;
}
this.points.clear();
this.points.putAll(points);
GKitPvPPlugin.p.log("Loaded " + points.size() + " points");
}
private Map<String, GLocation> loadCore() {
if (!this.file.exists()) {
return new HashMap<String, GLocation>();
}
String content = DiscUtil.readCatch(this.file);
if (content == null) {
return null;
}
Map<String, GLocation> data = this.gson.fromJson(
content,
new TypeToken<Map<String, GLocation>>() {
}.getType());
saveCore(this.file, data, true); // Update the flatfile
return data;
}
}
堆棧跟蹤：
java.lang.StackOverflowError
at me.expdev.gkitpvp.Points.<init>(Points.java:9) ~[?:?]
at me.expdev.gkitpvp.persist.MemoryPoints.<init>(MemoryPoints.java:14) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONPoints.<init>(JSONPoints.java:14) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONSpawn.<init>(JSONSpawn.java:22) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONPoints.<init>(JSONPoints.java:15) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONSpawn.<init>(JSONSpawn.java:22) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONPoints.<init>(JSONPoints.java:15) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONSpawn.<init>(JSONSpawn.java:22) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONPoints.<init>(JSONPoints.java:15) ~[?:?]
at me.expdev.gkitpvp.persist.json.JSONSpawn.<init>(JSONSpawn.java:22) ~
如此這般上。
-
這是一個與仿製藥的問題，但我不能完全把我的手指上。任何解決方案
編輯：
我想要做的：兩個JSONSpawn和JSONRandomPoints是用來序列化/反序列化類。例如，當在JSONSpawn中調用load（）時，它會將MemoryPoints中spawn的值設置爲從json文件序列化的對象。這是針對JSONSpawn類的。當負載（）被調用JSONRandomPoints，它再次將在MemoryPoints（用來處理該變量的getter和setter方法類）這個時間點的值，但是。使用JSONPoints，所以我可以同時在JSONSpawn和JSONRandomPoints中調用load（）。
所以Points.getInstance（）。LOADALL（）將調用JSONSpawn和JSONRandomPoints負載（）設置MemoryPoints兩個變量。保存也是一樣的（這與加載相同）。
上。例如程序加載：
Points.getInstance().loadAll().
現在MemoryPoints（產卵和分）變量已從調用類JSONSpawn和JSONRandomPoints負載（）設定。但我仍然可以使用：
Points.getInstance().getSpawn(); // returns spawn in MemoryPoints
不，StackOverflowError與泛型沒有任何關係。您沒有發佈異常的堆棧跟蹤，這可以讓您知道發生異常的位置，而無需閱讀您發佈的代碼牆的每一行。 –
@JB Nizet見編輯後。增加了堆棧跟蹤。 – ExpDev
我認爲這種層次結構相當混亂。我的猜測是，當你實例化一個JSONRandom時，它調用構造函數，並且從其他點繼承而來，它們的構造函數也被調用。所以在某些情況下，一個類的構造函數會從另一個類調用構造函數，這會讓你的堆棧溢出。嘗試重新組織層次結構或向我們解釋您正在嘗試解決的問題。但是，這種泛型不會導致你的問題。 – Hellzzar