我能够从 IntelliJ 2017.3 启动 Spring Boot Kotlin 应用程序。上次 IntelliJ 修复更新后,我无法从 IDE 启动该应用程序,出现此异常:
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: @Configuration class 'AccessConfig' may not be final
我可以像往常一样从终端启动它:java -jar xxxx.jar
这没有任何意义,因为我在 Gradle 配置中使用了必要的 Kotlin Spring 插件:
buildscript {
ext {
kotlinVersion = '1.2.21'
springBootVersion = '2.0.0.RC1'
}
repositories {
mavenCentral()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
jcenter()
maven {
url "https://plugins.gradle.org/m2/"
}
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
classpath 'org.asciidoctor:asciidoctor-gradle-plugin:1.5.3'
classpath 'org.junit.platform:junit-platform-gradle-plugin:1.0.2'
classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.5"
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'
apply plugin: 'maven'
...
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
kotlinOptions.jvmTarget = "1.8"
}
repositories {
mavenLocal()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
maven { url "http://repo.maven.apache.org/maven2" }
maven { url 'https://jitpack.io' }
}
ext {
springCloudVersion = 'Finchley.M5'
mmaReleaseTrainVersion = 'Callao-SNAPSHOT'
junitVersion = '5.0.2'
}
有什么想法吗?
更新:
一种更简单的重现方法,只需使用 IntelliJ 的 Spring 初始化程序创建一个 Spring Boot 项目,您将看到相同的结果:
DemoApplication:
@SpringBootApplication
class DemoApplication
fun main(args: Array<String>) {
SpringApplication.run(DemoApplication::class.java, *args)
}
错误:
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: @Configuration class 'DemoApplication' may not be final. Remove the final modifier to continue.
Offending resource: com.example.demo.DemoApplication
build.gradle:
buildscript {
ext {
kotlinVersion = '1.2.10'
springBootVersion = '1.5.10.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
classpath("org.jetbrains.kotlin:kotlin-allopen:${kotlinVersion}")
}
}
apply plugin: 'kotlin'
apply plugin: 'kotlin-spring'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
compileKotlin {
kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
kotlinOptions.jvmTarget = "1.8"
}
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:${kotlinVersion}")
compile("org.jetbrains.kotlin:kotlin-reflect:${kotlinVersion}")
testCompile('org.springframework.boot:spring-boot-starter-test')
}
最佳答案
首先,这一切都归功于 Kotlin 类 class definition :
The
open
annotation on a class is the opposite of Java'sfinal
: it allows others to inherit from this class. By default, all classes in Kotlin are final
所以如果你可以随意修改你的源代码,你可以让你的类不是最终的,只需添加 open
其签名如下:
@SpringBootApplication
open class DemoApplication
fun main(args: Array<String>) {
SpringApplication.run(DemoApplication::class.java, *args)
}
或根据此 article 的可能解决方案之一:
The
@SpringBootApplication
is a convenience annotation that marks the class with the@Configuration
,@EnableAutoConfiguration
and@ComponentScan
annotations. It is the@Configuration
annotation that forces the use of the open keyword.
是尝试删除@SpringBootApplication
用 @EnableAutoConfiguration
注释和注释你的类和 @ComponentScan
来解决这个问题。
关于spring - IntelliJ Idea 2017.3 无法启动 Kotlin Spring Boot 应用程序 - @Configuration 类可能不是最终的,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48544015/