Yeah, autoboxing is evil - it's just a compiler convenience thing. If you have:
Boolean closed = null;
boolean isClosed() {
return closed;
}
The compiler transforms it to
boolean isClosed() {
return closed.booleanValue();
}
which of course throws an NPE.
Steve.
--
Steve Eynon
On 3 September 2011 16:04, Gunnar Eketrapp <gunnar.eketr...@gmail.com> wrote:
> Tapestry may not go wrong!
>
> It must has to do with autoboxing in method isClosed() in Ledger.
>
> I was fooled by the debugger and that ledger was shown as null but when
> adding log statements I can see that it isn't.
>
> So I have to read a little bit about aoutoboxing but for sure it was NOT a
> T5 problem!
>
> The call ledger.isClosed() raises a nul pointer but ledgers is not null!
>
> Sorry for disturbing all of you.
>
>
> 2011/9/3 Gunnar Eketrapp <gunnar.eketr...@gmail.com>
>
>> BUT it is also a T5 property so that could be T5 related.
>>
>> The instance seems to created but the T5 property ledger is null after the
>> assignment.
>>
>>
>> 2011/9/3 Gunnar Eketrapp <gunnar.eketr...@gmail.com>
>>
>>> Hum .. sorry .. too early in the morning for me .. Ledger is a hibernate
>>> entity class and T5 should not be involved.
>>>
>>> I'll be right back ...
>>>
>>>
>>> 2011/9/3 Gunnar Eketrapp <gunnar.eketr...@gmail.com>
>>>
>>>> Hi !
>>>>
>>>> I have been happily hacking web sites with T5 for a year and half now and
>>>> is more then pleased!
>>>> Kudos to all of you for this excellent web framework that makes coding
>>>> fun again.
>>>>
>>>> And I have never ever encountered any defect in the T5 code.
>>>>
>>>> Now to my problem.
>>>>
>>>> I just got an error in an onActivate method that looked like it could not
>>>> happen.
>>>>
>>>> When steeping through it in my debugger I really get puzzled.
>>>>
>>>> A variable assigned inside a block is null after leaving the block.
>>>>
>>>> It must have something to do with the "plastering" of my code. Or !?
>>>>
>>>> The error I get is ..
>>>>
>>>> Caused by: java.lang.NullPointerException
>>>> at
>>>> utskicket.pages.economy.EditYear._$advised$onActivate_13(EditYear.java:91)
>>>>
>>>> ... and in the debugger I can see that ledger is null at line 91.
>>>>
>>>> In the code below I have commented what happens in the debugger.
>>>>
>>>> Can anyone understand what could cause this error ...
>>>> I have stepped through the generated code without seeing anything
>>>> strange. It all looks great but when returning ledger is null.
>>>>
>>>> Do I break any rule / convention with my code !?
>>>>
>>>> Many many thanks in advance,
>>>> Gunnar Eketrapp, Stockholm, Sweden
>>>>
>>>> Environment:
>>>> *jdk 1.6.0_22*
>>>> *t5.2.6*
>>>> *windows 7 proffesional, 32-bit*
>>>>
>>>>
>>>> @Property
>>>> private Ledger ledger;
>>>>
>>>> @Property
>>>> private String notice;
>>>>
>>>> //
>>>> ------------------------------------------------------------------------------
>>>> // -- Tapestry event methods - Tapestry event methods - Tapestry
>>>> event methods --
>>>> //
>>>> ------------------------------------------------------------------------------
>>>>
>>>> @Log
>>>> Object onActivate(long groupId, long ledgerId) {
>>>>
>>>> group = groupDAO.findById(groupId);
>>>> if (group == null)
>>>> return Index.class;
>>>>
>>>> if (ledgerId != 0) {
>>>> ledger = ledgerDAO.findById(ledgerId);
>>>> if (ledger == null)
>>>> return Index.class;
>>>> if (!same(group.getId(), ledger.getGroup().getId()))
>>>> return Index.class;
>>>>
>>>> hasPrevious = (null != ledgerDAO.findPrevious(ledger));
>>>> hasNext = (null != ledgerDAO.findNext(ledger));
>>>> transactionCount = transactionDAO.countTransactions(ledger);
>>>>
>>>> } else {
>>>> ledger = new Ledger(); * // 1: This one returns null !!!*
>>>> Ledger lastLedger = ledgerDAO.findLast(group);
>>>> if (null == lastLedger) {
>>>> UTDate today = new UTDate();
>>>> ledger.setStartDate(new UTDate(today.getYear(), 1, 1));
>>>> *// 2: This line ends the block!*
>>>> ledger.setEndDate(new UTDate(today.getYear(), 12, 31));
>>>> } else {
>>>>
>>>> ledger.setStartDate(lastLedger.getStartDate().warpYears(1));
>>>> ledger.setEndDate(lastLedger.getEndDate().warpYears(1));
>>>> }
>>>> }
>>>>
>>>> * if (ledger.getClosed()) // 3: And here we crash!*
>>>> notice = "Året är stängt och kan inte ändras";
>>>> else {
>>>> if (!mayEdit())
>>>> notice = "Endast det senaste året kan ändras.";
>>>> else if (!mayEditStarts())
>>>> notice = "Startdagen kan inte ändras då det finns
>>>> tidigare år.";
>>>> }
>>>>
>>>> return null;
>>>> }
>>>>
>>>>
>>>
>>>
>>> --
>>> [Hem: 08-715 59 57, Mobil: 070-991 86 42]
>>> Allévägen 2A, 132 42 Saltsjö-Boo
>>>
>>
>>
>>
>> --
>> [Hem: 08-715 59 57, Mobil: 070-991 86 42]
>> Allévägen 2A, 132 42 Saltsjö-Boo
>>
>
>
>
> --
> [Hem: 08-715 59 57, Mobil: 070-991 86 42]
> Allévägen 2A, 132 42 Saltsjö-Boo
>
---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
For additional commands, e-mail: users-h...@tapestry.apache.org
