kandi X-RAY | bookeditor Summary
kandi X-RAY | bookeditor Summary
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QUESTION
I am working on a Windows Application Development in c# language. I have a template form => Masterpage which is inherited by all my other forms.
It has menustrip to open all other forms as well:
my error reads:
...ANSWER
Answered 2020-May-21 at 09:00Why does StackOverflowException
occur?
StackOverflowException
occurs because of the infinite recursion inside the constructor of the Masterpage
.
Lets consider how this recursion occurs. BookEditor
inherits Masterpage
. (The following conclusions are also applicable to the other inheritors of the Masterpage
). I suspect that BookEditor
has a single constructor without parameters BookEditor()
. In C#
if you call constructor without parameters of the derived type it by default calls constructor without parameters of the base type (if you don't explicitly specify other constructor of the base type). Lets assume that we want to create an instance of the Masterpage
. We call its constructor Masterpage()
. Inside it we call constructor of the BookEditor
. But BookEditor
inherits Masterpage
and therefore it calls constructor of the Masterpage
. Constructor of the Masterpage
again calls constructor of the BookEditor
and etc. These sequence of the constructor calls leads to the infinite recursion and StackOverflowException
as a result.
How should you fix this problem?
I think that more information is needed to thoroughly answer this question.
As a workaround you should create inheritors of the Masterpage
outside of its constructor:
QUESTION
I want to code a little example using easymock 3.5 and JUnit5, but I get an error (nullPointerException) when trying to inject the mock...
here is the test code:
...ANSWER
Answered 2019-Dec-08 at 15:32In JUnit 5 Rules
can't be used any more. You have to use an Extension
and annotate the test class or method with ExtendWith
. Furthermore you have to use @BeforeEach
instead of @Before
(See also the migration section in the user guide).
Update: Since EasyMock 4.1, EasyMock ships with a JUnit 5 extension out of the box.
As far as I know there is no official EasyMock extension yet. Luckily the EasyMockRule
can be ported quite easily:
QUESTION
I have following data structure:
Collection books:
...ANSWER
Answered 2018-Mar-15 at 21:32Your publication has the following problematic part: $in
excpects an array, while book.poems.id
is a String value on a single poem. What you want, however is an array of all ids in book.poems
.
This is also the cause while the other subscription (editedBook
) receives some data and editedPoems
not. Subscription reflect only those documents, that have been found in the last execution of the publication method.
In order to get this correct you need to first map
Poems ids and set this array as value for $in
:
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