Question

I have been having a lot of trouble using an external JAR, GPars, in an IntelliJ Grails project. I think it is a problem with specifying the dependency. I am using GPars-1.0.0. I saved it in the lib directory and included it as a dependency using the IntelliJ GUI– Project Structure -> Module -> Add. I synchronized. I also tried adding directly to BuildConfig.groovy:

dependencies {
    compile 'org.codehaus.gpars:gpars:1.0.0'
}

I get Code Assist when typing and it compiles. But when I run the following:

import static groovyx.gpars.*

...

GParsPool.withPool {
     [1, 2, 3, 4, 5].eachParallel { println it }
}

I get ClassNotFoundException Message jsr166y.ForkJoinPool for the statement “GParsePool.withPool”

Line | Method 
->>  156 | findClass                 in org.codehaus.groovy.tools.RootLoader
|    306 | loadClass                 in java.lang.ClassLoader
|    128 | loadClass . . . . . . . . in org.codehaus.groovy.tools.RootLoader
|    247 | loadClass                 in java.lang.ClassLoader
|   2427 | privateGetDeclaredMethods in java.lang.Class
|   1791 | getDeclaredMethods        in     ''
|     46 | getLocked . . . . . . . . in org.codehaus.groovy.util.LazyReference
|     33 | get                       in     ''
|     80 | load . . . . . . . . . .  in allison.zipcode.ZipcodeService$$ENsSBrUW
|     30 | load                      in allison.zipcode.CountryController
|    195 | doFilter . . . . . . . .  in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|     63 | doFilter                  in grails.plugin.cache.web.filter.AbstractFilter
|    886 | runTask . . . . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker
|    908 | run                       in     ''
^    680 | run . . . . . . . . . . . in java.lang.Thread

Any ideas? Did I specify the dependency correctly in BuildConfig? My code example may be wrong but it seems to follow this example.

Answer 1

Figured it out: I hadn’t included jsr166y.jar

compile "org.codehaus.jsr166-mirror:jsr166y:1.7.0"