从房间 2.2.6 更新到 2.3.0 后，出现错误:“您必须使用 @NonNull 注释主键."

问题描述

我将房间从 2.2.6 更新到 2.3.0 并在编译时开始在编译/生成的 java 代码中看到奇怪的错误.我在 .kt 文件或目录 ...build/tmp/kapt3/stubs/debug 中生成的 .java 文件中没有看到任何错误/... 我只看到破坏构建的编译时错误.

I updated room from 2.2.6 to 2.3.0 and started seeing weird errors in the compiled/generated java code at compile time. I do not see any errors in my .kt files or in the generated .java files in the directory ...build/tmp/kapt3/stubs/debug/... I only see the compile-time error that breaks the build.

我得到的完整错误:

error: You must annotate primary keys with @NonNull. "version" is nullable. SQLite considers this a bug and Room does not allow it. See SQLite docs for details: https://www.sqlite.org/lang_createtable.html
    private java.lang.Integer version;

当我查看生成的 .java 代码时，我看到它正在注释它:

When I look at the generated .java code I see that it is annotating it:

@org.jetbrains.annotations.Nullable()
@androidx.annotation.NonNull()
private java.lang.Integer version;

我的 Kotlin 代码也有注释:

My Kotlin code is annotated as well:

import androidx.annotation.NonNull
...
    @NonNull
    var version: Int? = null

我的代码运行良好，经过充分测试并证明可以使用 2.2.6 房间.我更新到房间 2.3.0 后才开始遇到这个问题.

My code worked fine and is well tested and proven to work using room 2.2.6. I only started having this problem after updating to room 2.3.0.

旧的dependencies.gradle

Old dependencies.gradle

implementation "androidx.room:room-runtime:2.2.6"
kapt "androidx.room:room-compiler:2.2.6"

更新了dependencies.gradle

Updated dependencies.gradle

implementation "androidx.room:room-runtime:2.3.0"
kapt "androidx.room:room-compiler:2.3.0"

感谢任何帮助，谢谢！

推荐答案

Kotlin 不使用 @NonNull 注释 - 这由您的类型本身决定，在您的情况下是可空的 Int?.

Kotlin doesn't use @NonNull annotations - that's determined by your type itself, which in your case is a nullable Int?.

您需要将其更改为 Int 并为其分配一个默认值(即 -1).

You'll need to change it to an Int and assign it a default value (i.e., -1).

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