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java.lang.NullPointerException: Null value is not allowed! at com.hazelcast.util.Preconditions.checkNotNull(Preconditions.java:59)[256:com.hazelcast:3.8.5] at com.hazelcast.map.impl.proxy.MapProxyImpl.put(MapProxyImpl.java:125)[256:com.hazelcast:3.8.5] at com.hazelcast.map.impl.proxy.MapProxyImpl.put(MapProxyImpl.java:119)[256:com.hazelcast:3.8.5] at org.apache.karaf.cellar.features.FeaturesSynchronizer.push(FeaturesSynchronizer.java:249)[262:org.apache.karaf.cellar.features:4.1.1] at org.apache.karaf.cellar.features.FeaturesSynchronizer.sync(FeaturesSynchronizer.java:89)[262:org.apache.karaf.cellar.features:4.1.1] at org.apache.karaf.cellar.shell.SyncCommand.doSync(SyncCommand.java:130)[265:org.apache.karaf.cellar.shell:4.1.1] at org.apache.karaf.cellar.shell.SyncCommand.doExecute(SyncCommand.java:92)[265:org.apache.karaf.cellar.shell:4.1.1] at org.apache.karaf.cellar.core.shell.CellarCommandSupport.execute(CellarCommandSupport.java:62)[261:org.apache.karaf.cellar.core:4.1.1] at org.apache.karaf.shell.impl.action.command.ActionCommand.execute(ActionCommand.java:84)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:68)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.karaf.shell.impl.console.osgi.secured.SecuredCommand.execute(SecuredCommand.java:86)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:571)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:497)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:386)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Pipe.doCall(Pipe.java:417)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:229)[171:org.apache.karaf.shell.core:4.1.5] at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:59)[171:org.apache.karaf.shell.core:4.1.5] at java.util.concurrent.FutureTask.run(FutureTask.java:266)[?:?] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)[?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)[?:?] at java.lang.Thread.run(Thread.java:748)[?:?]