NullPointerException in DownloadService2

The new DownloadService2 API throws a NullPointerException when application calls DownloadService2.getCachedResources():

java.lang.NullPointerException
at com.sun.jnlp.DownloadService2Impl.matches(Unknown Source)
at com.sun.jnlp.DownloadService2Impl.getCachedResourcesImpl(Unknown Source)
at com.sun.jnlp.DownloadService2Impl.access$000(Unknown Source)
at com.sun.jnlp.DownloadService2Impl$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.jnlp.DownloadService2Impl.getCachedResources(Unknown Source)
at hello.test(hello.java:28)
at hello.<init>(hello.java:17)
at hello.main(hello.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)