GSON 2.10.1 支持 Java 17 吗？

Question

我们有一个在 Java 11 上运行的 kotlin（版本 1.9.21）服务，我们计划迁移到 Java 17。但是面临与 Gson（版本 2.10.1）相关的错误

java.lang.AssertionError: java.lang.IllegalAccessException: class com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$DefaultBoundField cannot access a member of class with modifiers "private final"
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:430)
    at io.gsonfire.util.JsonUtils.toJsonTree(JsonUtils.java:60)
    at io.gsonfire.gson.HooksTypeAdapter.write(HooksTypeAdapter.java:46)
    at com.gilecode.yagson.com.google.gson.Gson.toJson(Gson.java:693)
    at com.gilecode.yagson.com.google.gson.Gson.toJson(Gson.java:674)
    at com.gilecode.yagson.com.google.gson.Gson.toJson(Gson.java:662)
    at com.gilecode.yagson.com.google.gson.Gson.toJson(Gson.java:637)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)    
Caused by: java.lang.IllegalAccessException: class com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$DefaultBoundField cannot access a member of class com.inin.wfm.api.dto.forecasting.shortterm.bu.StoredShortTermForecastResultResponseApi with modifiers "private final"
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674)
    at java.base/java.lang.reflect.Field.checkAccess(Field.java:1102)
    at java.base/java.lang.reflect.Field.get(Field.java:423)
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$DefaultBoundField.getFieldValue(ReflectiveTypeAdapterFactory.java:226)
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$DefaultBoundField.writeField(ReflectiveTypeAdapterFactory.java:278)
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:425)

java.lang.RuntimeException: Unable to invoke no-args constructor for class. Registering an InstanceCreator with Gson for this type may fix this problem.
at com.gilecode.yagson.com.google.gson.internal.ConstructorConstructor$17.construct(ConstructorConstructor.java:267)
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.getInstance(ReflectiveTypeAdapterFactory.java:411)
    at com.gilecode.yagson.com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.readOptionallyAdvisedInstance(ReflectiveTypeAdapterFactory.java:380)
    at com.gilecode.yagson.adapters.TypeAdvisableComplexTypeAdapter.read(TypeAdvisableComplexTypeAdapter.java:51)
    at io.gsonfire.gson.HooksTypeAdapter.deserialize(HooksTypeAdapter.java:91)
    at io.gsonfire.gson.HooksTypeAdapter.read(HooksTypeAdapter.java:59)
    at com.gilecode.yagson.refs.impl.ReferencesNoneModeContext.doRead(ReferencesNoneModeContext.java:62)
    at com.gilecode.yagson.ReadContext.doRead(ReadContext.java:80)
    at com.gilecode.yagson.com.google.gson.Gson.fromJson(Gson.java:915)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)

Caused by: java.lang.UnsupportedOperationException: Cannot allocate class.
Caused by: java.lang.UnsupportedOperationException: Cannot allocate class Colgeneration
    at com.gilecode.yagson.com.google.gson.internal.UnsafeAllocator$4.newInstance(UnsafeAllocator.java:108)
    at com.gilecode.yagson.com.google.gson.internal.ConstructorConstructor$17.construct(ConstructorConstructor.java:261)
    ... 42 more

这是我们在多个文件中将 json 解析为对象的代码上下文

val cp = gson.fromJson(reader,RequiredClass::class.java)

这行用于将 json 解析为对象的代码在 Java 11 中运行良好，但在 Java 17 中则不然。

由于 Java 16 及更高版本取消了反射，Gson 是否与 Java 17 兼容。如果是，是否有任何经过验证的解决方法可以解决此错误。

Answer 1

一般来说，最新的 Gson 版本支持 Java 17 甚至 Java 21。但是，Gson 对尚未注册内置或自定义适配器的类使用反射。这些 JDK 版本强烈封装了 JDK 内部结构 (JEP 403)。因此，如果您之前（意外地）依赖于 JDK 类的基于反射的序列化，那么您将遇到

InaccessibleObjectException

并且必须为该类编写自定义

TypeAdapter

，请参阅 故障排除指南 了解更多信息.

补充几点：

• 根据异常堆栈跟踪，看起来您实际上并没有使用官方 Gson 类，而是重新打包的类

  com.gilecode.yagson.com.google.gson.Gson

  。
  那个重新打包的类似乎来自旧的 Gson 版本；请使用

  com.google.gson.Gson

  来代替。
• 正如评论中指出的，Gson 主要是为 Java 设计的。它可能适用于某些 Kotlin 功能，但不适用于所有功能（例如，不考虑可空性）。最好使用具有明确 Kotlin 支持的 JSON 库，例如：
  • https://github.com/square/moshi
  • https://github.com/FasterXML/jackson-module-kotlin
  • https://github.com/Kotlin/kotlinx.serialization