Calendar macro fails with NPE on WebSphere 6.1
----------------------------------------------

                 Key: ROL-1888
                 URL: https://issues.apache.org/jira/browse/ROL-1888
             Project: Roller
          Issue Type: Bug
          Components: Macros
    Affects Versions: 5.0
         Environment: IBM Java 1.5, Websphere 6.1.0.33 and DB2 9.7 express 
edition
            Reporter: Dave Johnson
            Assignee: Dave Johnson
             Fix For: 5.0


Here's the stack trace:

[10/26/10 8:30:46:968 EDT] 00000024 ServiceLogger I 
com.ibm.ws.ffdc.IncidentStreamImpl resetIncidentStream FFDC0010I: FFDC closed 
incident stream file C:\Program 
Files\IBM\WebSphere\AppServer\profiles\AppSrv01\logs\ffdc\server1_00000024_10.10.26_08.30.46_1.txt
[10/26/10 8:30:46:968 EDT] 00000024 CalendarTag   E 
org.apache.roller.weblogger.ui.core.tags.calendar.CalendarTag doStartTag 
Calendar tag exception
                                 java.lang.NullPointerException
        at 
org.apache.roller.weblogger.ui.core.tags.calendar.WeblogCalendarModel.computeUrl(WeblogCalendarModel.java:275)
        at 
org.apache.roller.weblogger.ui.core.tags.calendar.CalendarTag.doStartTag(CalendarTag.java:211)
        at 
org.apache.roller.weblogger.ui.core.tags.calendar.CalendarTag.toString(CalendarTag.java:340)
        at 
org.apache.roller.weblogger.ui.core.tags.calendar.CalendarTag.emit(CalendarTag.java:352)
        at 
org.apache.roller.weblogger.ui.rendering.model.CalendarModel.showWeblogEntryCalendar(CalendarModel.java:110)
        at 
org.apache.roller.weblogger.ui.rendering.model.CalendarModel.showWeblogEntryCalendar(CalendarModel.java:78)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:618)
        at 
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:389)
        at 
org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:378)

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