java - Libgdx JsonWriter StackOverflowError 错误

Question

尝试使用基于 jsonbeans 的 com.badlogic.gdx.utils.Json 将对象写入 json 时，出现 StackOverflowError 错误。 。该对象及其引用的所有对象仅包含原始变量，如 float、boolean、int 等，但对 ShapeRenderer 的引用除外。多个对象都引用同一个 ShapeRenderer。有一些循环引用(对象都互相引用)，但我认为它应该能够处理这个问题。

导致这些错误的原因是什么？循环引用有问题吗？我不能简单地删除它们而不返回绘图板并重组我的应用程序的主要部分。

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.StackOverflowError
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:111)
Caused by: java.lang.StackOverflowError
    at java.util.regex.Pattern$CharProperty$1.isSatisfiedBy(Unknown Source)
    at java.util.regex.Pattern$7.isSatisfiedBy(Unknown Source)
    at java.util.regex.Pattern$7.isSatisfiedBy(Unknown Source)
    at java.util.regex.Pattern$7.isSatisfiedBy(Unknown Source)
    at java.util.regex.Pattern$7.isSatisfiedBy(Unknown Source)
    at java.util.regex.Pattern$CharProperty.match(Unknown Source)
    at java.util.regex.Pattern$Curly.match0(Unknown Source)
    at java.util.regex.Pattern$Curly.match(Unknown Source)
    at java.util.regex.Pattern$CharProperty.match(Unknown Source)
    at java.util.regex.Matcher.match(Unknown Source)
    at java.util.regex.Matcher.matches(Unknown Source)
    at com.badlogic.gdx.utils.JsonWriter$OutputType.quoteName(JsonWriter.java:174)
    at com.badlogic.gdx.utils.JsonWriter.name(JsonWriter.java:46)
    at com.badlogic.gdx.utils.JsonWriter.set(JsonWriter.java:113)
    at com.badlogic.gdx.utils.Json.writeType(Json.java:574)
    at com.badlogic.gdx.utils.Json.writeObjectStart(Json.java:533)
    at com.badlogic.gdx.utils.Json.writeValue(Json.java:491)
    at com.badlogic.gdx.utils.Json.writeFields(Json.java:237)
    at com.badlogic.gdx.utils.Json.writeValue(Json.java:492)
    at com.badlogic.gdx.utils.Json.writeFields(Json.java:237)
    at com.badlogic.gdx.utils.Json.writeValue(Json.java:492)
    at com.badlogic.gdx.utils.Json.writeFields(Json.java:237)
    at com.badlogic.gdx.utils.Json.writeValue(Json.java:492)
    at com.badlogic.gdx.utils.Json.writeFields(Json.java:237)

这持续了大约 1024 行:

    at com.badlogic.gdx.utils.Json.writeValue(Json.java:492)
    at com.badlogic.gdx.utils.Json.writeFields(Json.java:237)

不确定这是日志限制还是堆栈限制，我猜是第一个。

Answer 1

循环引用是问题所在。这是一个不错的Solution :

I think the best way to address this is, is to probably remove your circular link by re-architeching your data structure in some way, maybe using some sort of map or table instead to link the Entity to the Item.

If you really must keep the circular references, then I'd recommend writing your own parser as simply ignoring the owner on serialization will mean the owner is not returned when the serialized objects are deserialized.