java.lang.NoClassDefFoundError: grizzled/slf4j/Logger - scala

Question

I am doing a project in scala and getting the following error when i run the build jar. It is working fine in Intellij Idea
This is a maven project and have included the following dependencies for logging
First i tried with scala-logging and ended up with same sort of error.
Then tried with grizzled same error occurred.
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<dependency>
<groupId>io.spray</groupId>
<artifactId>spray-io</artifactId>
<version>${spray.version}</version>
</dependency>
<dependency>
<groupId>io.spray</groupId>
<artifactId>spray-routing</artifactId>
<version>${spray.version}</version>
</dependency>
<dependency>
<groupId>io.spray</groupId>
<artifactId>spray-httpx</artifactId>
<version>${spray.version}</version>
</dependency>
<dependency>
<groupId>io.spray</groupId>
<artifactId>spray-json_${scala.base}</artifactId>
<version>${spray.version}</version>
</dependency>
<dependency>
<groupId>io.spray</groupId>
<artifactId>spray-client</artifactId>
<version>${spray.version}</version>
</dependency>
<dependency>
<groupId>org.json4s</groupId>
<artifactId>json4s-native_${scala.base}</artifactId>
<version>3.2.11</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_${scala.base}</artifactId>
<version>${akka.version}</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.1.2</version>
</dependency>
<dependency>
<groupId>com.typesafe.slick</groupId>
<artifactId>slick_${scala.base}</artifactId>
<version>${slick.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.1-901.jdbc4</version>
</dependency>
<dependency>
<groupId>org.clapper</groupId>
<artifactId>grizzled-slf4j_${scala.base}</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
<version>2.9.4</version>
</dependency>
Error occurred is as follows
Exception in thread "main" java.lang.NoClassDefFoundError: grizzled/slf4j/Logger
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: grizzled.slf4j.Logger
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Please help in sorting out the issue.
Thanks,
Rahul

Answer 1

Errors like this can occur when the resulting dependency tree contains different versions of the same artifact.
In your case:
<groupId>org.clapper</groupId>
<artifactId>grizzled-slf4j_2.10</artifactId>
<version>1.0.2</version>
depends on
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.7</version>
but you, in addition, use 1.7.10.
So try to change slf4j-api version from 1.7.10 to 1.7.7