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java.lang.NullPointerException: Unable to retrieve signature from stream	at org.apache.commons.lang3.Validate.notNull(Validate.java:222)	at org.springframework.roo.felix.pgp.PgpServiceImpl.isSignatureAcceptable(PgpServiceImpl.java:224)	at org.springframework.roo.felix.HttpPgpUrlStreamHandlerServiceImpl.openConnection(HttpPgpUrlStreamHandlerServiceImpl.java:110)	at org.apache.felix.framework.URLHandlersStreamHandlerProxy.openConnection(URLHandlersStreamHandlerProxy.java:271)	at java.net.URL.openConnection(Unknown Source)	at org.apache.felix.bundlerepository.impl.FileUtil.openURL(FileUtil.java:199)	at org.apache.felix.bundlerepository.impl.ResolverImpl.deploy(ResolverImpl.java:598)	at org.apache.felix.bundlerepository.impl.ObrCommandImpl._deploy(ObrCommandImpl.java:395)	at org.apache.felix.bundlerepository.impl.ObrCommandImpl.deploy(ObrCommandImpl.java:333)	at org.apache.felix.bundlerepository.impl.ObrCommandImpl.execute(ObrCommandImpl.java:119)	at org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:286)	at org.springframework.roo.felix.FelixDelegator.perform(FelixDelegator.java:208)	at org.springframework.roo.felix.FelixDelegator.obrStart(FelixDelegator.java:146)	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)