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java.lang.NullPointerException: 	at aQute.bnd.http.URLCache$Info.lock(URLCache.java:97)	at aQute.bnd.http.URLCache$Info.(URLCache.java:57)	at aQute.bnd.http.URLCache.get(URLCache.java:128)	at aQute.bnd.http.HttpClient.doCached0(HttpClient.java:146)	at aQute.bnd.http.HttpClient.doCached(HttpClient.java:122)	at aQute.bnd.http.HttpClient.send(HttpClient.java:111)	at aQute.bnd.http.HttpRequest.go(HttpRequest.java:186)	at aQute.maven.provider.MavenRemoteRepository.fetch(MavenRemoteRepository.java:44)	at aQute.maven.provider.MavenBackingRepository.getMetadata(MavenBackingRepository.java:94)	at aQute.maven.provider.MavenBackingRepository.getVersion(MavenBackingRepository.java:149)	at aQute.maven.provider.MavenRepository.resolveSnapshot(MavenRepository.java:185)	at aQute.maven.provider.MavenRepository.get0(MavenRepository.java:146)	at aQute.maven.provider.MavenRepository.access$000(MavenRepository.java:34)	at aQute.maven.provider.MavenRepository$1.run(MavenRepository.java:121)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)