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How do servlets work? Instantiation, sessions, shared variables and multithreading
... servlet container (like Apache Tomcat) starts up, it will deploy and load all its web applications. When a web application is loaded, the servlet container creates the ServletContext once and keeps it in the server's memory. The web app's web.xml and all of included web-fragment.xml files is parsed...
How to change default timezone for Active Record in Rails?
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I have decided to compile this answer because all others seem to be incomplete.
config.active_record.default_timezone determines whether to use Time.local (if set to :local) or Time.utc (if set to :utc) when pulling dates and times from the database. The default is :...
SQL Query to concatenate column values from multiple rows in Oracle
... (with tag E)
extract the text of this
aggregate the xml (concatenate it)
call the resulting column "Result"
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Really weird eclipse keyboard behavior/bug?
I am using Helios on Mac Snow Leopard. I don't know why but all of a sudden my arrow keys and delete button start not working only on Eclipse (so Eclipse ignores them) but the rest of the buttons works just fine. There is no exception/error thrown anywhere on the screen. I don't exactly know how to ...
MySQL SELECT only not null values
...hough...
SELECT val1 AS val
FROM your_table
WHERE val1 IS NOT NULL
UNION ALL
SELECT val2
FROM your_table
WHERE val2 IS NOT NULL
/*And so on for all your columns*/
The disadvantage of the above is that it scans the table multiple times once for each column. That may possibly be avoided by the b...
Global variables in Java
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public static int b;
}
now you can access a and b from anywhere
by calling
Example.a;
Example.b;
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How to decompile a whole Jar file? [closed]
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2009: JavaDecompiler can do a good job with a jar: since 0.2.5, All files, in JAR files, are displayed.
See also the question "How do I “decompile” Java class files?".
The JD-Eclipse doesn't seem to have changed since late 2009 though (see Changes).
So its integration with latest Ecl...
Update all objects in a collection using LINQ
...pose; rather, it's used to iterate over the elements of the collection and allow access to a property so that it can be updated. The only question in my mind would be whether or not the foreach loop could benefit from parallelism using Parallel.ForEach, but that's a different question.
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What are enums and why are they useful?
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You should always use enums when a variable (especially a method parameter) can only take one out of a small set of possible values. Examples would be things like type constants (contract status: "permanent", "temp", "apprentice"), or flags ("execute now", "defer execution")....
Efficient way to remove ALL whitespace from String?
I'm calling a REST API and am receiving an XML response back. It returns a list of a workspace names, and I'm writing a quick IsExistingWorkspace() method. Since all workspaces consist of contiguous characters with no whitespace, I'm assuming the easiest way to find out if a particular workspace i...