我想写一个插件，可以通过检查nosql数据库来验证用户，但是当我尝试在我的服务器上运行它时，我遇到了错误。我使用gradle导入mongo驱动程序，但得到NoClassDefFoundError。这是错误代码：
[04:17:15] [Server thread/INFO]: [mcloginx] mongo uri: mongodb://localhost:27017
[04:17:15] [Server thread/WARN]: java.lang.NoClassDefFoundError: com/mongodb/MongoClient
[04:17:15] [Server thread/WARN]: at com.t2o0n321.mcloginx.utils.db.testConnect(db.java:21)
[04:17:15] [Server thread/WARN]: at com.t2o0n321.mcloginx.mcloginx.onEnable(mcloginx.java:35)
[04:17:15] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[04:17:15] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342)
[04:17:15] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:480)
[04:17:15] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:492)
[04:17:15] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:406)
[04:17:15] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.reload(CraftServer.java:879)
[04:17:15] [Server thread/WARN]: at org.bukkit.Bukkit.reload(Bukkit.java:651)
[04:17:15] [Server thread/WARN]: at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:27)
[04:17:15] [Server thread/WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149)
[04:17:15] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:761)
[04:17:15] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchServerCommand(CraftServer.java:746)
[04:17:15] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.DedicatedServer.handleCommandQueue(DedicatedServer.java:426)
[04:17:15] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.DedicatedServer.b(DedicatedServer.java:395)
[04:17:15] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.a(MinecraftServer.java:1127)
[04:17:15] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:966)
[04:17:15] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$0(MinecraftServer.java:273)
[04:17:15] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:829)
[04:17:15] [Server thread/WARN]: Caused by: java.lang.ClassNotFoundException: com.mongodb.MongoClient
[04:17:15] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:140)
[04:17:15] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:99)
[04:17:15] [Server thread/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
[04:17:15] [Server thread/WARN]: ... 19 more
[04:17:15] [Server thread/INFO]: [mcloginx] Can't connect to mongo
这是我的build. gradle文件：
plugins {
id 'java'
id 'application'
}
group 'com.t2o0n321.mcloginx'
version '1.0.0'
repositories {
mavenCentral()
maven {url 'https://hub.spigotmc.org/nexus/content/repositories/snapshots/'}
}
dependencies {
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
compileOnly 'org.spigotmc:spigot-api:1.16.5-R0.1-SNAPSHOT'
// implementation 'org.mongodb:mongodb-driver-core'
implementation 'org.mongodb:mongodb-driver-core:4.4.1'
implementation 'org.mongodb:mongo-java-driver:3.12.10'
}
test {
useJUnitPlatform()
}
我用谷歌搜索了一下，但还没有得到解决方案。如何解决这个问题？
发生错误是因为没有导出具有所有依赖项的jar。我通过使用影子Jar打包所有依赖项来收集来解决它。
将以下代码添加到build. gradle
plugins {
id 'com.github.johnrengelman.shadow' version '7.0.0'
}
project.setProperty("mainClassName", "com.your.mainclass")
shadowJar {
manifest {
attributes 'Main-Class': 'com.your.mainclass'
}
}
并键入./gradlew影子Jarint终端。
您将在build/libs目录中找到jar文件。
