Oracle 11gR2 netmgr/netca issue resolution on Solaris 10 for Corrupted listener.ora file

Following error comes when starting the netmgr or netca.

bash-3.2$ netmgr
Warning: Cannot convert string "-hanyi-ming-medium-r-normal--*-140-*-*-m-*-big5- 1" to type FontStruct
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at oracle.net.mgr.listener.ListenerComponent.loadData(Unknown Source)
at oracle.net.mgr.listener.ListenerComponent$ListenerCompDataSource.inte rnal_refreshData(Unknown Source)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.TreeDataSourc e.populateData(TreeDataSource.java:1039)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.TreeDataSourc e._initData(TreeDataSource.java:1083)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.TreeDataSourc e.initData(TreeDataSource.java:1056)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.TreeParentNod e.setExpanded(TreeParentNode.java:284)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.TreeParentNod e.setExpanded(TreeParentNode.java:242)
at oracle.ewt.dTree.DTreeButtonDecoration.processMouseEvent(Unknown Sour ce)
at oracle.ewt.dTree.DTreeStackingDecoration.processMouseEvent(Unknown So urce)
at oracle.ewt.dTree.DTree.processMouseEvent(Unknown Source)
at oracle.sysman.emSDK.client.dataComponent.dataDrivenTree.DataDrivenTre e.processMouseEvent(DataDrivenTree.java:1226)
at java.awt.Component.processEvent(Component.java:5282)
at java.awt.Container.processEvent(Container.java:1966)
at oracle.ewt.lwAWT.LWComponent.processEventImpl(Unknown Source)
at oracle.ewt.dTree.DTree.processEventImpl(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)
at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Component.java:3984)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212 )
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3889)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Component.dispatchEvent(Component.java:3819)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh read.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre ad.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

This has caused because of corrupted listener.ora file.

Solution

1. First back up the Listener.ora file.
2. Check the listener running on by following command.
    ps -ef|grep tns
3. Kill the Listener Process and also listener.ora file.
    kill -9 <Process-ID>
4. Start the listener from LSNRCTL Utility without the listener.ora file.
5. Now the default listener with 1521 port will be started and Net Manger and Net CA should be   working fine.