[英]Gradle Uber (Fat) Jar and java.lang.NoClassDefFoundError in Runtime
I am trying to create a UberJar file with Gradle.我正在尝试使用 Gradle 创建一个 UberJar 文件。
To build and run the jar file I execute commands ./gradlew clean build java -jar build/libs/jLocalCoin-0.2.jar
要构建和运行 jar 文件,我执行命令
./gradlew clean build java -jar build/libs/jLocalCoin-0.2.jar
And I get Exception我得到异常
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/primitives/Longs
// ... rest of stacktrace
at im.djm.zMain.Main03.main(Main03.java:13)
Caused by: java.lang.ClassNotFoundException: com.google.common.primitives.Longs
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 8 more
I don't understand what is the reason for the exception?我不明白异常的原因是什么?
I do understand that Guava library is not part of the jar, but why?我知道 Guava 库不是 jar 的一部分,但为什么呢?
In this questio , in the accepted answer, the jar file is created in the same way as I try to do.在这种questio ,在接受的答案,以相同的方式,我尝试做创建的jar文件。
This is build.grade
file这是
build.grade
文件
apply plugin: 'java'
apply plugin: 'java-library'
apply plugin: 'application'
mainClassName = 'im.djm.zMain.Main03'
archivesBaseName = 'jLocalCoin'
version = "0.2"
run {
standardInput = System.in
}
repositories {
jcenter()
}
dependencies {
implementation 'com.google.guava:guava:24.0-jre'
testImplementation 'junit:junit:4.12'
testCompile 'org.assertj:assertj-core:3.8.0'
}
jar {
manifest {
attributes "Main-Class": "$mainClassName"
}
from {
configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
}
}
The jar you created probably does not have guava in it.您创建的罐子里可能没有番石榴。
NoClassDefFoundError
occurs when your project does not have required runtime dependecies in the classpath.当您的项目在类路径中没有必需的运行时依赖项时,会发生
NoClassDefFoundError
。 The tutorial I checked created fatJar this way,我查的教程就是这样创建fatJar的,
task fatJar(type: Jar) {
baseName = project.name + '-all'
manifest {
attributes 'Implementation-Title': 'Gradle Jar File Example',
'Implementation-Version': version,
'Main-Class': 'com.mkyong.DateUtils'
}
from { configurations.compile.collect { it.isDirectory() ? it :
zipTree(it) }
}
with jar
}
and change implementation 'com.google.guava:guava:24.0-jre'
to compile 'com.google.guava:guava:24.0-jre'
then it does include guava in the generated jar并更改
implementation 'com.google.guava:guava:24.0-jre'
以compile 'com.google.guava:guava:24.0-jre'
然后它确实在生成的 jar 中包含了番石榴
and run command gradle fatJar
并运行命令
gradle fatJar
source = https://www.mkyong.com/gradle/gradle-create-a-jar-file-with-dependencies/来源 = https://www.mkyong.com/gradle/gradle-create-a-jar-file-with-dependencies/
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