java.lang.NoClassDefFoundError:尝试运行jar时
我有一个使用gradle的spring boot项目
apply plugin: 'java'apply plugin: 'idea'
apply plugin: 'jetty'
apply plugin: 'war'
apply plugin: 'org.springframework.boot'
repositories {
mavenCentral()
}
dependencies {
compile("org.springframework.boot:spring-boot-starter-web:1.5.1.RELEASE") {
exclude module: "spring-boot-starter-tomcat"
}
compile group: 'org.springframework.boot', name: 'spring-boot-starter-jetty', version: '1.5.1.RELEASE'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-actuator', version: '1.5.1.RELEASE'
compile group: 'org.springframework', name: 'spring-webmvc', version: '4.3.6.RELEASE'
compile group: 'org.springframework', name: 'spring-context-support', version: '4.3.6.RELEASE'
compile group: 'org.springframework', name: 'spring-orm', version: '4.3.6.RELEASE'
compile group: 'javax.servlet', name: 'javax.servlet-api', version: '3.1.0'
compile group: 'org.freemarker', name: 'freemarker', version: '2.3.23'
compile group: 'mysql', name: 'mysql-connector-java', version: '6.0.5'
compile group: 'org.hibernate', name: 'hibernate-core', version: '5.1.4.Final'
compile group: 'commons-validator', name: 'commons-validator', version: '1.5.1'
compile group: 'junit', name: 'junit', version: '4.12'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-test', version: '1.5.1.RELEASE'
}
task wrapper(type: Wrapper) {
gradleVersion = '2.2'
}
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:1.5.1.RELEASE")
}
}
jar {
baseName = 'base-name'
version = '0.1.0'
manifest {
attributes 'Main-Class': 'some.application.Application'
}
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
我使用构建,
./gradlew clean jar
然后尝试运行
java -jar <jar-name>.jar
但是我收到一个错误消息
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/boot/SpringApplication at some.application.Application.main(Application.java:11)
Caused by: java.lang.ClassNotFoundException: org.springframework.boot.SpringApplication
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
我对为什么可以在IDE中而不是作为jar运行它感到困惑。另外我发现我的jar根本不包含任何库。
编辑:
这是我的 Application.class
打包一些应用程序;
import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application
{
public static void main(String[] args)
{
SpringApplication.run(Application.class, args);
}
}
回答:
这是因为您的依赖项未包含在最终jar文件中。
在这里或这里看看示例。
或者,使用./gradlew clean
build可以自动正确打包应用程序。看看官方指南
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