Java 中的 NotNull 在哪里？
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where is NotNull in java?
提问by user1244932
I want to compile simple code with oracle jdk 1.8:
我想用oracle jdk 1.8编译简单的代码：
class Foo {
public static void test(@NotNull String a) {}
}
But ideanot understand such code, and suggest to add:
但是idea看不懂这样的代码，建议加上：
import com.sun.istack.internal.NotNull;
after that compilation inside ideaworks,
but if run build by gradlewith such build.gradle:
在内部编译之后idea，但如果gradle使用这样的运行构建build.gradle：
version '1.0-snaphshot_03.03.2017'
apply plugin: 'java'
targetCompatibility = '1.8'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
}
task sourcesJar(type: Jar, dependsOn: classes) {
classifier = 'sources'
from sourceSets.main.allSource
}
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.11'
}
artifacts {
archives sourcesJar
}
I got error:
我有错误：
error: package com.sun.istack.internal does not exist
import com.sun.istack.internal.NotNull;
error: cannot find symbol
public static void test(@NotNull String a) {
^
symbol: class NotNull
location: class Foo
I thought that NotNullwas added in 1.8?
How can I make possible of usage of NotNullin ideaand gradle?
我以为NotNull是加进去的1.8？我怎样才能使用NotNullinidea和gradle？
回答by Kayaman
There is no @NotNullannotation in the standard JDK that would be meant for general use (the com.sun.internal.istack.NotNullis definitely not for your usage, as it's an internal class).
@NotNull标准 JDK 中没有用于一般用途的注释（com.sun.internal.istack.NotNull绝对不适合您使用，因为它是一个内部类）。
The Java Bean validation framework (JSR-303) has javax.validation.constraints.NotNull, which is implemented by (for example) Hibernate validator. That's probablywhat you're looking for.
Java Bean 验证框架 (JSR-303) 具有javax.validation.constraints.NotNull，由（例如）Hibernate 验证器实现。这可能就是你要找的。
回答by noobCoder
I think you should be adding org.jetbrains.annotations.NotNullas this is Used by IntelliJ IDEA IDE for static analysis.
Refer :
IntelliJ Documentation
This SO Question
我认为您应该添加，org.jetbrains.annotations.NotNull因为 IntelliJ IDEA IDE 使用它进行静态分析。请参阅：
IntelliJ 文档
此 SO 问题
