pig-0.9.0.pom does not contain all its runtime dependencies, like pig-0.8.1-cdh3u1.pom - maven

Question

maven noob, be patient...
I'm upgrading from cdh3u1 to apache hadoop 0.20.203.0 and pig 0.9.0. I used to have:
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>0.20.2-cdh3u1</version>
</dependency>
<dependency>
<groupId>org.apache.pig</groupId>
<artifactId>pig</artifactId>
<version>0.8.1-cdh3u1</version>
</dependency>
and running them from inside eclipse, with junit run configuration worked great.
Now I have:
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-core</artifactId>
<version>0.20.203.0</version>
</dependency>
<dependency>
<groupId>org.apache.pig</groupId>
<artifactId>pig</artifactId>
<version>0.9.0</version>
</dependency>
and I got NoClassDefFoundError: jline/ConsoleReaderInputStream on runtime.
I ended with adding all these dependencies manually until it worked:
<dependency>
<groupId>jline</groupId>
<artifactId>jline</artifactId>
<version>0.9.94</version>
</dependency>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr-runtime</artifactId>
<version> 3.2 </version> <- this is 3.0.1 in cdh3u1, but probably changed in pig 0.9.0
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>r06</version>
</dependency>
What gives? why isn't maven automatically pulling my dependencies and putting them in the classpath?

Answer 1

Maven has a feature called Transitive dependencies, so you don´t have to specify the libraries that your own dependencies require.
ConsoleReaderInputStream is in the Jline JAR. When you were using Pig.0.8.1-cdh3u1, you didn´t have to add the Jline dependency because it is declared in Pig.0.8.1-cdh3u1.pom. Pig 0.9.0.pom does not have Jline dependency declared anymore, that´s the reason you had to add it by yourself. As for the reason JLine was removed from Pig, you have to ask the developers of that project.