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What version of javac built my jar?
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You can't tell from the JAR file itself, necessarily.
Download a hex editor and open one of the class files inside the JAR and look at byte offsets 4 through 7. The version information is built in.
http://en.wikipedia.org/wiki/Java_class...
Execution time of C program
...s. I need to be able to record the execution time (which could be anywhere from 1 second to several minutes). I have searched for answers, but they all seem to suggest using the clock() function, which then involves calculating the number of clocks the program took divided by the Clocks_per_secon...
Smallest data URI image possible for a transparent image
...file can actually contain multiple “images” within it, which keeps you from having to specify image data for parts of the image which have the same color as the background color. Each image block has a position and size within the overall image size. In the above file, the position is 0,0 and th...
When NOT to call super() method when overriding?
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For those who also wondered which overridden methods from Android Framework should call super and found this question - here's a current hint from 2019 - Android Studio 3+ will tell you when you need it.
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Delete sql rows where IDs do not have a match from another table
...HERE f.id IS NULL
Using NOT EXISTS:
DELETE FROM BLOB
WHERE NOT EXISTS(SELECT NULL
FROM FILES f
WHERE f.id = fileid)
Using NOT IN:
DELETE FROM BLOB
WHERE fileid NOT IN (SELECT f.id
FROM FILES f)
Warning
Whenever possible, per...
How to make exe files from a node.js app?
...ip up all your files, with a package.json in the root
Change the extension from .zip to .nw
copy /b nw.exe+app.nw app.exe
Just as an added note - I've shipped several production box/install cd applications using this, and it's worked great. Same app runs on windows, mac, linux and over the web.
U...
SLF4J: Failed to load class “org.slf4j.impl.StaticLoggerBinder”. error
...rch:
"amd64" Family: "unix"
2 Run maven externally link how to run maven from console
> cd path-to-pom.xml
> mvn test
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building Simple
[INFO] task-segme...
Convert pem key to ssh-rsa format
I have a certificate in der format, from it with this command I generate a public key:
8 Answers
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Seeking useful Eclipse Java code templates [closed]
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Format a string
MessageFormat - surround the selection with a MessageFormat.
${:import(java.text.MessageFormat)}
MessageFormat.format(${word_selection}, ${cursor})
This lets me move a cursor to a string, expand the selection to the entire string (Shift-Alt-Up), th...
Database development mistakes made by application developers [closed]
... the log output from Hibernate and you'll see all the queries begin with:
SELECT DISTINCT ...
This is a bit of a shortcut to ensuring you don't return duplicate rows and thus get duplicate objects. You'll sometimes see people doing this as well. If you see it too much it's a real red flag. Not...