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This exception has no message.
java.lang.NullPointerException at org.netbeans.modules.web.debug.util.Utils.getServletClass( at org.netbeans.modules.web.debug.util.Utils.getClassFilter( at org.netbeans.modules.web.debug.breakpoints.JspLineBreakpoint.<init>( at org.netbeans.modules.web.debug.breakpoints.JspLineBreakpoint.create( at at org.netbeans.api.debugger.Properties$PropertiesImpl.getObject(