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[英]java.lang.NoClassDefFoundError when trying to instantiate class from jar
[英]java.lang.NoClassDefFoundError: when trying to run jar
我有一個使用 gradle 的 spring boot 項目
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./gradlew clean jar
然后嘗試使用運行java -jar <jar-name>.jar
但是我收到一個錯誤說
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
我很困惑為什么我可以在 IDE 中運行它而不是 jar。 我還發現我的 jar 根本不包含任何庫。
編輯:
這是我的Application.class
打包 some.application;
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);
}
}
build.gradle
定義一個名為fatJar
的任務:jar {
baseName = 'base-name'
version = '0.1.0'
manifest {
attributes(
'Main-Class': 'com.github:'
)
}
}
task fatJar(type: Jar) {
manifest.from jar.manifest
// classifier = 'all'
from {
configurations.runtime.collect { it.isDirectory() ? it : zipTree(it) }
} {
exclude "META-INF/*.SF"
exclude "META-INF/*.DSA"
exclude "META-INF/*.RSA"
}
with jar
}
artifacts {
archives fatJar
}
gradle fatJar
或./gradlew fatJar
生成一個包含所有依賴項的jar
文件,它可以獨立運行,但可能體積很大(這就是為什么它被稱為胖 jar)。
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