Java on iBook running Leopard

I'm a teacher and we have to use a java app called PowerTeacher 1.1 Gradebook.
I am having trouble getting the app to run correctly on my own personal iBook. It will load and run correctly on a Windows desktop machine. Our IT guy in charge of getting Powergrade to work, isn't really interested in helping me because the district uses all Dell machines running Windows XP. He will only help me with Windows computer issues... not with anything on my own personal computer. Theoretically, java apps should run on either OS, right?
Any ideas or suggestions will be most appreciated.
The app will load, but all the features will not work. I can't add new assignments, view final grades, etc. Here is the error message I get:
java.lang.NullPointerException:
at org.xito.dialog.TableLayout.calculatePositions(TableLayout.java:729)
at org.xito.dialog.TableLayout.preferredLayoutSize(TableLayout.java:293)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:690)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1626)
at com.pearson.powerschool.gradebook.MainPanel.loadDetailPanel(MainPanel.java:444)
at com.pearson.powerschool.gradebook.BaseDetailPanel.loadDetailPanel(BaseDetailPan el.java:108)
at com.pearson.powerschool.gradebook.setup.GradingDetailPanel$1.reportingTermLoade d(GradingDetailPanel.java:49)
at com.pearson.powerschool.gradebook.setup.ReportingTermHandler.fireReportingTermL oadedEvent(ReportingTermHandler.java:30)
at com.pearson.powerschool.gradebook.setup.ReportingTermController.loadReportingTe rm(ReportingTermController.java:25)
at com.pearson.powerschool.gradebook.setup.MainGradingPanel$1.finished(MainGrading Panel.java:104)
at com.pearson.powerschool.gradebook.SDKClientTask$1.run(SDKClientTask.java:114)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at com.pearson.powerschool.gradebook.CustomEventQueue.dispatchEvent(CustomEventQue ue.java:19)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java: 269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:19 0)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)

Dick,
First, thanks so much for your response.
Second, Where do you get the "patch"? I have to ask the IT in charge of Powerschool where to find the patch and beg him to install it. The school's official "platform" is Windows XP and will have to beg him to do this.
Third, I just installed Leopard 10.5.5 and the Powergrade java app still doesn't work correctly. The program files don't load completely. The program starts but it is not full functional.
Fourth, the program won't load at all on a Dell laptop, but will work on a Dell Desktop.
Fifth, I will ask the IT guy to contact powerschool tech support about this.
Sixth, once again thank you very much!

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