java.lang.ClassNotFoundException: reactivemongo.api.MongoDriver

[Andrei Biketov]

Hi,

I'm getting the following error:

java.lang.NoClassDefFoundError: reactivemongo/api/MongoDriver

at java.lang.Class.getDeclaredMethods0(Native Method)

at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

at java.lang.Class.privateGetMethodRecursive(Class.java:3048)

at java.lang.Class.getMethod0(Class.java:3018)

at java.lang.Class.getMethod(Class.java:1784)

at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)

at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)

Caused by: java.lang.ClassNotFoundException: reactivemongo.api.MongoDriver

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)

... 7 more

Error: A JNI error has occurred, please check your installation and try again

Exception in thread "main" 

Environment: sbt 1.0.2 & scala 2.12

build.sbt dependencies:

libraryDependencies += "com.typesafe.play" % "play-json_2.12" % "2.6.3"

libraryDependencies += "com.typesafe.akka" % "akka-actor_2.12" % "2.5.4"

libraryDependencies += "com.typesafe.akka" % "akka-testkit_2.12" % "2.5.4" % "test"

libraryDependencies += "org.reactivemongo" % "reactivemongo_2.12" % "0.12.6" % "provided"

libraryDependencies += "org.reactivemongo" % "reactivemongo-bson_2.12" % "0.12.6"

libraryDependencies += "org.reactivemongo" % "reactivemongo-bson-macros_2.12" % "0.12.6"

libraryDependencies += "org.slf4j" % "slf4j-api" % "1.7.25"

Works with version 2.11

[Andrei Biketov]

Solved: 

libraryDependencies += "org.reactivemongo" % "reactivemongo_2.12" % "0.12.6" % "provided"

"provided" must be removed. Just copied it from maven as is. Not sure why they put it at the end.

[Cédric Chantepie]

Having the scala dependencies defined with _2.12 (fixed version) is error prone and prevent cross build.

Moreover, if the dependency for the driver is specified, the bson and bson macros dependencies should not be explicitly added, as it can cause versions conflict.