java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at oracle.apps.ad.tools.configuration.NetServiceHandler.isAliasPresent(NetServiceHandler.java:1297)
at oracle.apps.ad.tools.configuration.NetServiceHandler.getTNSAliasForHost(NetServiceHandler.java:1362)
at oracle.apps.ad.tools.configuration.NetServiceHandler.getMiddleTierEntriesFromContextFile(NetServiceHandler.java:1414)
at oracle.apps.ad.tools.configuration.NetServiceHandler.writeToFile(NetServiceHandler.java:1612)
at oracle.apps.ad.tools.configuration.NetServiceHandler.generateTNS(NetServiceHandler.java:2238)
at oracle.apps.ad.tools.configuration.NetServiceHandler.processNode(NetServiceHandler.java:2262)
at oracle.apps.ad.tools.configuration.NetServiceHandler.main(NetServiceHandler.java:2979)

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