IntelliJ IDEA Grails Not Seeing Jar

I'm trying to reference a class within IntelliJ IDEA 9.0.2 in a Grails project on a Linux system. I added the dependency to BuildConfig.groovy:

dependencies {
    // specify dependencies here under either 'build', 'compile', 'runtime', 'test' or 'provided' scopes eg.

    runtime开发者_StackOverflow中文版 'mysql:mysql-connector-java:5.1.5'
    compile 'org.apache.poi:poi-ooxml:3.6'
  }

I see the org.apache.poi in my ~/.ivy2/cache directory, but get a compile error when referencing a class in the jars. In fact, the code complete doesn't show any org.apache.poi classes. So it appears IntelliJ doesn't know about these classes.

Any ideas what I'm doing wrong? Why doesn't IntelliJ see these classes?

Figured it out... "Tools-->Synchronize Grails dependencies"

In IntelliJ 13.1, it is now: Tools -> Grails -> Synchronize Grails

In IntelliJ 15, the "Synchronize" option moved to File -> Synchronize

In IntelliJ 15, the "Synchronize" option moved to File -> Synchronize