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How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version
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java.lang.UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime.
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HTTP 1.0 vs 1.1
...officially require a Host header, but it doesn't hurt to add one, and many applications (proxies) expect to see the Host header regardless of the protocol version.
Example:
GET / HTTP/1.1
Host: www.blahblahblahblah.com
This header is useful because it allows you to route a message through proxy ...
How to detect online/offline event cross-browser?
...cable.
Mozilla Firefox (before version 41), Opera, and IE take a different approach, and consider you "online" unless you explicitly pick "Offline Mode" in the browser - even if you don't have a working network connection.
There are valid arguments for the Firefox/Mozilla behavior, which are outline...
ASP.NET web.config: configSource vs. file attributes
Within an web.config -file in an ASP.NET-application some sections of config, like appSettings and connectionStrings , supports the attributes file and configSource .
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Good tutorial for using HTML5 History API (Pushstate?) [closed]
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Ideally your server/app should respond to the route appropriately without the need for this rewrite.
– sholsinger
Jul 16 '12 at 23:46
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Validation failed for one or more entities. See 'EntityValidationErrors' property for more details [
I am having this error when seeding my database with code first approach.
29 Answers
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When do you use varargs in Java?
...ting to the logs for purposes of debugging.
Pretty much every class in my app has a method debugPrint():
private void debugPrint(Object... msg) {
for (Object item : msg) System.out.print(item);
System.out.println();
}
Then, within methods of the class, I have calls like the following:
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How to install a gem or update RubyGems if it fails with a permissions error
... have permission to write there.
That is the version of Ruby installed by Apple, for their own use. While it's OK to make minor modifications to that if you know what you're doing, because you are not sure about the permissions problem, I'd say it's not a good idea to continue along that track.
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Reduce git repository size
...g is Heroku only allows 50 MB and I'm no where near finished developing my app.
3 Answers
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Devise - How do I forbid certain users from signing in?
I am using Devise for authentication in my application.
4 Answers
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