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When should assertions stay in production code? [closed]
There's a discussion going on over at comp.lang.c++.moderated about whether or not assertions, which in C++ only exist in debug builds by default, should be kept in production code or not.
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Best practices for in-app database migration for Sqlite
...isting tables in-place. See the documentation here: http://www.sqlite.org/lang_altertable.html. For deleting columns or other changes that aren't supported by the "ALTER TABLE" syntax, I create a new table, migrate date into it, drop the old table, and rename the new table to the original name.
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SQLite UPSERT / UPDATE OR INSERT
...ite to figure out what to do in case of a conflict. See:https://sqlite.org/lang_conflict.html.
Also note the sentence regarding delete triggers: When the REPLACE conflict resolution strategy deletes rows in order to satisfy a constraint, delete triggers fire if and only if recursive triggers are e...
When should an IllegalArgumentException be thrown?
... to throw a checked exception (although it makes an appearance in the java.lang.reflect code, where concern about ridiculous levels of checked-exception-throwing is not otherwise apparent).
I would use IllegalArgumentException to do last ditch defensive argument checking for common utilities (tryi...
How do I use disk caching in Picasso?
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this is giving me this error: FATAL EXCEPTION: main java.lang.NoClassDefFoundError: com.squareup.okhttp.OkHttpClient
– CIRCLE
Mar 13 '15 at 14:22
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When and how should I use a ThreadLocal variable?
...bage collected.
You will end up with out of memory exceptions due to java.lang.OutOfMemoryError: PermGen space and after some googling will probably just increase -XX:MaxPermSize instead of fixing the bug.
If you do end up experiencing these problems, you can determine which thread and class is re...
How to initialize log4j properly?
...g classes. Resources are handled similarly. See the documentation for java.lang.ClassLoader for more details.
So, if you're having problems, try loading the class or resource yourself. If you can't find it, neither will log4j. ;)
See also:
Short introduction to log4j at Apache site
Apache: Loggin...
Are empty HTML5 data attributes valid?
....7 https://validator.w3.org/nu/#textarea :
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>a</title>
</head>
<body data-asdf>
</body>
</html>
On the other, HTML5 does not say in the specification of data- attri...
Android 4.3 Bluetooth Low Energy unstable
... 11-01 18:37:32.131: WARN/BluetoothGatt(20119): Unhandled exception: java.lang.NullPointerException)
– Lo-Tan
Nov 1 '13 at 22:52
2
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Singletons vs. Application Context in Android?
...without the code 'Looper.prepare()',the system will report the error "java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()".
– sunhang
Jun 24 '14 at 5:48
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