Grails stops at "Configuring classpath" even at a helloworld project

I want to learn Grails, so I started with a Hello-World Projekt. I tried everything in the cmd.exe and in STS. I have Windows7.

First i wrote grails create-app helloworld command

Then i swaped in the new helloworld\ directory and wrote grails run-app

But the command-line doesn't go furthen then Configuring classpath

I watched in other forums but nothing helped. I am sitting in a companys-internet. Does this cause the fault ?

Fault if log level is set on verbose (only the last few lines - before were about 500 other lines)

| Error Failed to resolve dependencies (Set log level to 'warn' in BuildConfig.groovy for more information):

• org.apache.tomcat.embed:tomcat-embed-core:7.0.42
• org.apache.tomcat.embed:tomcat-embed-logging-log4j:7.0.42
• org.eclipse.jdt.core.compiler:ecj:3.7.2
• org.apache.tomcat:tomcat-catalina-ant:7.0.42
• org.apache.tomcat.embed:tomcat-embed-logging-juli:7.0.42
• org.apache.tomcat.embed:tomcat-embed-jasper:7.0.42

Edit: I use Grails 2.2.4 and heres my BuildConfig.groovy:

grails.servlet.version = "2.5" // Change depending on target container compliance (2.5 or 3.0)
grails.project.class.dir = "target/classes"
grails.project.test.class.dir = "target/test-classes"
grails.project.test.reports.dir = "target/test-reports"
grails.project.target.level = 1.6
grails.project.source.level = 1.6
//grails.project.war.file = "target/${appName}-${appVersion}.war"

// uncomment (and adjust settings) to fork the JVM to isolate classpaths
//grails.project.fork = [
//   run: [maxMemory:1024, minMemory:64, debug:false, maxPerm:256]
//]

grails.project.dependency.resolution = {
    // inherit Grails' default dependencies
    inherits("global") {
        // specify dependency exclusions here; for example, uncomment this to disable ehcache:
        // excludes 'ehcache'
    }
    log "error" // log level of Ivy resolver, either 'error', 'warn', 'info', 'debug' or 'verbose'
    checksums true // Whether to verify checksums on resolve
    legacyResolve false // whether to do a secondary resolve on plugin installation, not advised and here for backwards compatibility

    repositories {
        inherits true // Whether to inherit repository definitions from plugins

        grailsPlugins()
        grailsHome()
        grailsCentral()

        mavenLocal()
        mavenCentral()

        // uncomment these (or add new ones) to enable remote dependency resolution from public Maven repositories
        //mavenRepo "http://snapshots.repository.codehaus.org"
        //mavenRepo "http://repository.codehaus.org"
        //mavenRepo "http://download.java.net/maven/2/"
        //mavenRepo "http://repository.jboss.com/maven2/"
    }

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

        // runtime 'mysql:mysql-connector-java:5.1.22'
    }

    plugins {
        runtime ":hibernate:$grailsVersion"
        runtime ":jquery:1.8.3"
        runtime ":resources:1.2"

        // Uncomment these (or add new ones) to enable additional resources capabilities
        //runtime ":zipped-resources:1.0"
        //runtime ":cached-resources:1.0"
        //runtime ":yui-minify-resources:0.1.5"

        build ":tomcat:$grailsVersion"

        runtime ":database-migration:1.3.2"

        compile ':cache:1.0.1'
    }
}