我正在使用谷歌的jarjar来重新打包我应用程序中的依赖项。在运行重新打包的jar时,我得到NoClassDefFoundError
例如:
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/LoggerContext
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.classic.LoggerContext
我反编译了重新打包的jar,发现在import语句和我的代码中对依赖项的引用没有被重构。我哪里错了?
这是我如何运行jarjar:
java -jar jarjar-1.4.jar process repackageRules.txt myApp.jar app_repackaged.jar
我在repackageRules.txt中列出的规则:
rule javassist.** company.@0
rule org.eclipse.** company.@0
rule ch.qos.** company.@0
rule com.fasterxml.** company.@0
rule biz.paluch.** company.@0
我的build.gradle:
/* Gradle version: 3.0 */
apply plugin: 'java'
apply plugin: 'jacoco'
group='com.company'
version=0.1
repositories {
jcenter()
}
dependencies {
compile group: 'org.javassist', name: 'javassist', version: '3.20.0-GA'
compile group: 'ch.qos.logback', name: 'logback-classic', version: '1.1.7'
compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.8.6'
compile group: 'org.eclipse.jdt', name: 'org.eclipse.jdt.core', version: '3.12.2'
compile 'biz.paluch.logging:logstash-gelf:1.11.0'
testCompile 'junit:junit:4.12'
}
// Create jar with manifest as described
jar {
manifest {
attributes ('Premain-Class': 'com.company.instrumentation.Agent',
'Can-Redefine-Classes': true,
'Can-Retransform-Classes': true,
'Can-Set-Native-Method-Prefix': true,
'Main-Class': 'com.company.Main')
}
}
//create a single Jar with all dependencies
task fatJar(type: Jar) {
manifest.from jar.manifest
classifier = 'all'
from {
configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
} {
// to prevent duplicate files in jar
exclude "META-INF/*"
exclude '.api_description'
exclude '.options'
exclude '*.html'
exclude 'plugin.properties'
exclude 'plugin.xml'
exclude 'about_files/*'
}
with jar
}
我尝试使用java -jar jarjar-1.4.jar find class myApp.jar
我的代码中的所有类都出现了这样的错误:Error reading com/company/Main.class: null
导致此问题的原因是什么?
答案 0 :(得分:1)
导致错误是因为JarJar使用的ASM 4.0不支持JDK 8字节码。这可以通过构建此fork of JarJar来解决,该this被修改为使用ASM 5.0。