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java.lang.NullPointerException: 	at JPIPHttpClient.set_responseheader(JPIPHttpClient.java:219)	at JPIPHttpClient.GETrequest(JPIPHttpClient.java:172)	at JPIPHttpClient.requestViewWindow(JPIPHttpClient.java:140)	at JPIPHttpClient.requestViewWindow(JPIPHttpClient.java:95)	at JPIPHttpClient.requestViewWindow(JPIPHttpClient.java:80)	at ImageManager.getImage(ImageManager.java:99)	at ImageViewer.enlarge(ImageViewer.java:124)	at ResizeListener.componentResized(ResizeListener.java:54)	at java.awt.Component.processComponentEvent(Component.java:5962)	at java.awt.Component.processEvent(Component.java:5916)	at java.awt.Container.processEvent(Container.java:2105)	at java.awt.Component.dispatchEventImpl(Component.java:4497)	at java.awt.Container.dispatchEventImpl(Container.java:2163)	at java.awt.Component.dispatchEvent(Component.java:4323)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:649)	at java.awt.EventQueue.access$000(EventQueue.java:96)	at java.awt.EventQueue$1.run(EventQueue.java:608)	at java.awt.EventQueue$1.run(EventQueue.java:606)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)	at java.awt.EventQueue$2.run(EventQueue.java:622)	at java.awt.EventQueue$2.run(EventQueue.java:620)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:619)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)