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NullPointerException in Java with no StackTrace
...sing log4j. I discovered (inadvertently) a place where I had written
LOG.error(exc);
instead of the typical
LOG.error("Some informative message", e);
through laziness or perhaps just not thinking about it. The unfortunate part of this is that it doesn't behave as you expect. The logger API ...
When is the init() function run?
...if metapath, ok := Config["fs"]["metapath"].(string); ok {
var err error
Conn, err = services.NewConnection(metapath + "/metadata.db")
if err != nil {
panic(err)
}
}
}
regardless of whether var ConfigSuccess = configureApplication() exists in router....
Java 8 stream reverse order
General question: What's the proper way to reverse a stream? Assuming that we don't know what type of elements that stream consists of, what's the generic way to reverse any stream?
...
How can I delete all Git branches which have been merged?
...
This produces an error fatal: branch name required if you have no branches that should be deleted. To avoid that you can pass -r to xargs so it won't run git branch -d if the stdin is empty. (This a GNU xargs extension, according to the man...
How do I initialize a byte array in Java?
... @petmez dumb question: in JAVA, is something like "".getBytes(UTF_8)); (getBytes on an empty string) a safe thing to do? is it 'legal'? Or can I just do: = new byte[0]; ?
– Robert Achmann
Mar 1 '19 at 18:35
...
Callback functions in Java
...hat simple
public interface myCallback {
void onSuccess();
void onError(String err);
}
now to make this callback run when ever you wish to do to handle the results - more likely after async call and you wanna run some stuff which depends on these reuslts
// import the Interface class her...
How to pass command line arguments to a rake task
...don't do this: rake thing:work[1, 2, 3] as it won't work and you'll get an error Don't know how to build task
– rpbaltazar
Sep 29 '16 at 11:30
10
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How can I disable HREF if onclick is executed?
...tn-loading is added to the clicked link, then if successful a checkmark(on error an X) replaces the loading animation. I don't want the button to be able to be clicked again in some instances(for both success and error), using this I can simply $(elemnent).addClass('disabled') and easily achieve the...
Android Fragment lifecycle over orientation changes
...reated. This is a massive pain in the rear most of the time.
You can stop errors occurring by using the same Fragment rather than recreating a new one. Simply add this code:
if (savedInstanceState == null) {
// only create fragment if activity is started for the first time
mFragmentManager...
Most efficient method to groupby on an array of objects
...
There's a reference error on your code in jsBin.
– Rod Talingting
Jul 20 at 22:37
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