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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...ial:
If you get a SQLException: Connection refused or Connection timed out or a MySQL specific CommunicationsException:
Communications link failure, then it means that the DB isn't reachable at all. This can have one or more of the following causes:
IP address or hostname in JDBC URL ...
How to send a stacktrace to log4j?
Say you catch an exception and get the following on the standard output (like, say, the console) if you do a e.printStackTrace() :
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Advantage of creating a generic repository vs. specific repository for each object?
...ble, a uniform representation of a query, has caused a lot of discussion about this very topic.
I prefer specific repositories myself, after having worked very hard to build a generic repository framework. No matter what clever mechanism I tried, I always ended up at the same problem: a repository ...
How to read file from relative path in Java project? java.io.File cannot find the path specified
...ing?
do a small experiment
File directory = new File("./");
System.out.println(directory.getAbsolutePath());
Observe the output , you will come to know the current directory where java is looking . From there , simply use the ./ operator to locate your file.
for example if the output is
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Convert System.Drawing.Color to RGB and Hex Value
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@LarryBud Absolutely true, and thank you for pointing it out. My example skipped the alpha channel only because I was keying off of the original question, which also didn't include it. :)
– Ari Roth
Apr 5 '19 at 19:29
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How do I hide javascript code in a webpage?
...ad that external javascript file to see it, but you did ask how to keep it out of the browser's View Source command and this will do it.
If you wanted to really make it more work to view the source, you would do all of the following:
Put it in an external .js file.
Obfuscate the file so that most...
How to execute a java .class from the command line
... CLASSPATH=%CLASSPATH;.
java Echo "hello"
And later as Fredrik points out you'll get another error message like.
Exception in thread "main" java.lang.NoSuchMethodError: main
When that happens, go and read his answer :)
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How to empty a list?
...nk a part of the list while replacing a part at the same time (but that is out of the scope of the question).
Note that doing lst = [] does not empty the list, just creates a new object and binds it to the variable lst, but the old list will still have the same elements, and effect will be apparent...
How to compute the sum and average of elements in an array?
...ing problems adding all the elements of an array as well as averaging them out. How would I do this and implement it with the code I currently have? The elements are supposed to be defined as I have it below.
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Ubuntu, vim, and the solarized color palette
...t's 8 you'll want to se t_Co=16. You might also try se t_Co=256 though without let g:solarized_termcolors=16 this will use the 256 fallback mode, which isn't quite the correct color scheme.
I'd comment on the question above for the following, but karma of 50 is required. Please do email me via the...