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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(	at java.util.Properties.setProperty(	at org.postgresql.ds.common.BaseDataSource.setProperty(	at org.postgresql.ds.common.BaseDataSource.setUrl(	at org.postgresql.osgi.PGDataSourceFactory.configureBaseDataSource(	at org.postgresql.osgi.PGDataSourceFactory.createSimpleDataSource(	at org.postgresql.osgi.PGDataSourceFactory.createDataSource(	at org.ops4j.pax.jdbc.config.impl.DataSourceRegistration.createDs(	at org.ops4j.pax.jdbc.config.impl.DataSourceRegistration.(	at org.ops4j.pax.jdbc.config.impl.DataSourceFactoryTracker.addingService(	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(	at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(	at org.osgi.util.tracker.AbstractTracked.trackAdding(	at org.osgi.util.tracker.AbstractTracked.trackInitial(	at	at	at org.ops4j.pax.jdbc.config.impl.DataSourceConfigManager.updated(	at	at	at$	at	at	at