Adding dependency causes main class to not be found

When adding the com.spotify:docker-client:3.5.12 dependency to build.gradle, it causes my main class "com.gamedash.daemon.Main" to not be found. I have absolutely no clue what this might be causing. Removing the dependency resolves the issue.

build.gradle

group 'com.gamedash.daemon'
version '0.1'
apply plugin: 'java'
apply plugin: 'application'
apply plugin: 'eclipse'
apply plugin: 'idea'
sourceCompatibility = 9
targetCompatibility = 9
repositories {
mavenCentral()
maven {
url 'https://jetbrains.bintray.com/pty4j'
}
}
application {
mainClassName = 'com.gamedash.daemon.Main'
}
jar {
manifest {
attributes(
'Main-Class': 'com.gamedash.daemon.Main'
)
}
from {
configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) }
}
}
sourceSets {
main {
resources {
srcDirs "src/main/resources", "src/main/configs"
}
}
}
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'net.sf.proguard:proguard-gradle:6.2.2'
}
}
dependencies {
implementation('me.tongfei:progressbar:0.7.4')
implementation('com.google.guava:guava:28.2-jre')
implementation('com.corundumstudio.socketio:netty-socketio:1.7.17')
implementation('org.jetbrains.pty4j:pty4j:0.8.6')
implementation('commons-io:commons-io:2.6')
implementation('org.zeroturnaround:zt-zip:1.13')
implementation('org.apache.httpcomponents:httpclient:4.5.8')
implementation('com.beust:jcommander:1.78')
implementation('com.google.code.gson:gson:2.8.5')
implementation('com.github.oshi:oshi-core:4.4.2')
implementation('net.java.dev.jna:jna:5.3.1')
implementation('net.java.dev.jna:jna-platform:5.3.1')
implementation('org.apache.commons:commons-lang3:3.9')
implementation('com.sparkjava:spark-core:2.9.1')
implementation('org.slf4j:slf4j-api:1.7.6')
implementation('org.slf4j:slf4j-log4j12:1.7.5')
implementation('org.apache.mina:mina-core:2.0.0-M2')
implementation('org.apache.ftpserver:ftplet-api:1.1.1')
implementation('org.apache.ftpserver:ftpserver-core:1.1.1')
implementation('org.apache.sshd:sshd-core:2.4.0')
implementation('org.apache.sshd:sshd-sftp:2.4.0')
compile('com.spotify:docker-client:3.5.12:shaded')
implementation('org.beryx:text-io:3.3.0')
implementation('com.fasterxml.jackson.core:jackson-core:2.9.8')
implementation('com.fasterxml.jackson.core:jackson-annotations:2.9.8')
implementation('com.fasterxml.jackson.core:jackson-databind:2.9.8')
compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.4'
implementation group: 'commons-validator', name: 'commons-validator', version: '1.4.0'
implementation files('lib/icmp4j-all.jar')
implementation files('lib/Schokker-IT-Rest-Client.jar')
implementation files('lib/com.gamedash.daemon.common.jar')
}
task obfuscate(type: proguard.gradle.ProGuardTask) {
configuration 'proguard.txt'
injars "build/libs/gamedash-daemon-${ version }.jar"
outjars "build/libs/gamedash-daemon-${ version }-obfuscated.jar"
}

Turns out that the library in question uses Bouncycastle and thus requires a signed jar to run. Would have been much more pleasant if the error message would have said so, instead of telling me that the class was not found.

Fixed it by adding the following rule to my build.gradle

exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA'