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In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
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@NotEmpty: The CharSequence, Collection, Map or Array object is not null and size > 0.
@NotBlank: The string is not null and the trimmed length is greater than zero.
To help you understand, let's look into how these constraints are defined and carried out (I'm using version 4.1):
The @Not...
Test if a class has an attribute?
I'm trying to do a little Test-First development, and I'm trying to verify that my classes are marked with an attribute:
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How to convert `git:` urls to `http:` urls
I'm working behind an http proxy. I'm trying to clone Android's source tree using their "repo" tool.
4 Answers
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What are CFI directives in Gnu Assembler (GAS) used for?
There seem to be a .CFI directive after every line and also there are wide varities of these ex., .cfi_startproc , .cfi_endproc etc.. more here .
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sed error: “invalid reference \1 on `s' command's RHS”
I run several substitution commands as the core of a colorize script for maven .
One of the sed commands uses a regular expression which works find in the shell as discussed here . The current (not working) implementation can be found here .
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Update a local branch with the changes from a tracked remote branch
...nch
(see:
"How do you make an existing git branch track a remote branch?" and
"Git: Why do I need to do --set-upstream-to all the time?"
)
git branch -f --track my_local_branch origin/my_remote_branch
# OR (if my_local_branch is currently checked out):
$ git branch --set-upstream-to my_local_bran...
What is & used for
... character reference".
& is the character reference for "An ampersand".
&current; is not a standard character reference and so is an error (browsers may try to perform error recovery but you should not depend on this).
If you used a character reference for a real character (e.g. &...
What is a .h.gch file?
...t to generate pre-compiled headers it will make them if they don’t exist and use them in the next build.
Sometimes the *.h.gch will get corrupted or contain outdated information, so deleting that file and compiling it again should fix it.
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Create a Path from String in Java7
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Is there a way for this to work with relative path and full path? i.e giving a path relative to where the project or exe is?
– shinzou
Aug 14 '16 at 17:07
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SQL Group By with an Order By
I have a table of tags and want to get the highest count tags from the list.
6 Answers
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