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Evaluate empty or null JSTL c tags
...c:choose>
Or if you don't need to conditionally render a bunch of tags and thus you could only check it inside a tag attribute, then you can use the EL conditional operator ${condition? valueIfTrue : valueIfFalse}:
<c:out value="${empty var1 ? 'var1 is empty or null' : 'var1 is NOT empty or n...
Can't open config file: /usr/local/ssl/openssl.cnf on Windows [duplicate]
...t to use a certificate for my nodejs https server. I ran the following command:
7 Answers
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Make body have 100% of the browser height
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As an alternative to setting both the html and body element's heights to 100%, you could also use viewport-percentage lengths.
5.1.2. Viewport-percentage lengths: the ‘vw’, ‘vh’, ‘vmin’, ‘vmax’ units
The viewport-percentage lengths are relative to the...
Saving vim macros
...copy/paste registers so you can paste it as normal with the "xp or "xP commands in normal mode.
To save it you open up .vimrc and paste the contents, then the register will be around the next time you start vim.
The format is something like:
let @q = 'macro contents'
Be careful of quotes, though...
How do I get the current Date/time in DD/MM/YYYY HH:MM format?
How can I get the current date and time in DD/MM/YYYY HH:MM format and also increment the month?
4 Answers
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A Java API to generate Java source files [closed]
... an API. It's not the easiest thing to get information on, but it's there and it works extremely well.
The easiest way to get hold of it is as part of the JAXB 2 RI - the XJC schema-to-java generator uses CodeModel to generate its java source, and it's part of the XJC jars. You can use it just fo...
MySql server startup error 'The server quit without updating PID file '
...ere PID is the number displayed next to username on output of previous command
check ownership of /usr/local/var/mysql/
ls -laF /usr/local/var/mysql/
if it is owner by root you should change it mysql or your_user
sudo chown -R mysql /usr/local/var/mysql/
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How do I make class methods / properties in Swift?
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They are called type properties and type methods and you use the class or static keywords.
class Foo {
var name: String? // instance property
static var all = [Foo]() // static type property
class var comp: Int { // computed ...
Run a single test method with maven
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To run a single test method in Maven, you need to provide the command as:
mvn test -Dtest=TestCircle#xyz test
where TestCircle is the test class name and xyz is the test method.
Wild card characters also work; both in the method name and class name.
If you're testing in a multi-module ...
Make: how to continue after a command fails?
The command $ make all gives errors such as rm: cannot remove '.lambda': No such file or directory so it stops. I want it to ignore the rm-not-found-errors. How can I force-make?
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