minor test fix

Author: siordache

src/main/groovy/org/beryx/runtime/JreTask.groovy

@@ -19,6 +19,7 @@ import groovy.transform.CompileStatic
 import org.beryx.runtime.data.JreTaskData
 import org.beryx.runtime.data.TargetPlatform
 import org.beryx.runtime.impl.JreTaskImpl
+import org.gradle.api.GradleException
 import org.gradle.api.file.Directory
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.OutputDirectory
@@ -63,8 +64,8 @@ class JreTask extends BaseTask {
 
     JreTask() {
         dependsOn('jar')
-        dependsOn(project.configurations.runtimeClasspath.allDependencies)
         description = 'Creates a custom java runtime image with jlink'
+        dependsOn(project.configurations['runtimeClasspath'].allDependencies)
     }
 
     @TaskAction

src/test/groovy/org/beryx/runtime/RuntimePluginSpec.groovy

@@ -89,7 +89,8 @@ class RuntimePluginSpec extends Specification {
         imageLauncher.setExecutable(true)
         def process = imageLauncher.absolutePath.execute([], imageBinDir)
         def out = new ByteArrayOutputStream(2048)
-        process.waitForProcessOutput(out, out)
+        def err = new ByteArrayOutputStream(2048)
+        process.waitForProcessOutput(out, err)
         def outputText = out.toString()
 
         then: