Need explicit slf4j in standalone apps.
<artifactId>bcpkix-jdk15on</artifactId>
<scope>compile</scope>
</dependency>
+ <dependency>
+ <groupId>org.slf4j</groupId>
+ <artifactId>slf4j-api</artifactId>
+ <scope>compile</scope>
+ </dependency>
</dependencies>
<build>
<plugins>
