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java.lang.NullPointerException: 	at oracle.sysman.emSDK.emd.comm.EMDClient.getURL(EMDClient.java:1570)	at oracle.sysman.emSDK.emd.comm.EMDClient.getConnection(EMDClient.java:1266)	at oracle.sysman.emSDK.emd.comm.EMDClient.getConnection(EMDClient.java:1242)	at oracle.sysman.emSDK.emd.comm.EMDClient.getResponseForRequest(EMDClient.java:1689)	at oracle.sysman.emSDK.emd.comm.EMDClient.getMetrics(EMDClient.java:981)	at oracle.sysman.emo.perf.metric.rt.DbHomeTab._getAllData(DbHomeTab.java:340)	at oracle.sysman.emo.perf.metric.rt.DbHomeTab.getData(DbHomeTab.java:154)	at oracle.sysman.emo.perf.metric.eng.MetricCached.collectCachedData(MetricCached.java:416)	at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread._collectCachedData(MetricCollectorThread.java:605)	at oracle.sysman.emo.perf.metric.eng.MetricCollectorThread.run(MetricCollectorThread.java:325)	at java.lang.Thread.run(Thread.java:595)