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When and how should I use a ThreadLocal variable?
...en using them to avoid unwanted side-effects and memory leaks. Design your APIs so that the ThreadLocal values will always be automatically cleared when they are not needed anymore and that incorrect use of the API won't be possible (for example like this). ThreadLocals can be used to make the code ...
How to call a method after bean initialization is complete?
...est solution, in my opinion.
It keeps your code decoupled from the Spring API (@PostConstruct is in javax.*)
It explicitly annotates your init method as something that needs to be called to initialize the bean
You don't need to remember to add the init-method attribute to your spring bean definitio...
What is the purpose of mock objects?
... case, it's probably okay because you're checking that it uses the correct API, but what if there are different ways to do it, and waiter might choose one or the other? I thought the point of unit testing was to test the API, and not the implementation. (This is a question I always find myself askin...
Difference between Destroy and Delete
...troy runs any callbacks on the model while delete doesn't.
From the Rails API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can't be persisted). Returns the frozen instance.
The row is ...
How to get body of a POST in php?
...ote that the php://input stream, regardless of how you access it in a web SAPI, is not seekable. This means that it can only be read once. If you're working in an environment where large HTTP entity bodies are routinely uploaded you may wish to maintain the input in its stream form (rather than buff...
How can I combine two HashMap objects containing the same types?
...
One-liner using Java 8 Stream API:
map3 = Stream.of(map1, map2).flatMap(m -> m.entrySet().stream())
.collect(Collectors.toMap(Entry::getKey, Entry::getValue))
Among the benefits of this method is ability to pass a merge function, which will d...
SQLite with encryption/password protection
...SL's libcrypto to implement.
SQLiteCrypt - Custom implementation, modified API.
botansqlite3 - botansqlite3 is an encryption codec for SQLite3 that can use any algorithms in Botan for encryption.
sqleet - another encryption implementation, using ChaCha20/Poly1305 primitives. Note that wxSQLite ment...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
...n2002: Indeed your observation is true! However, from the viewpoint of the API design, if the query just return one NULL value, I believe it is better to return it as is, instead of asumming that (as queryForInt do) a NULL is equivalent to 0. It is the job of the API user to evaluate that kind of co...
How to Display blob (.pdf) in an AngularJS app
...urn {
downloadPdf: function () {
return $http.get('api/downloadPDF', { responseType: 'arraybuffer' }).then(function (response) {
return response;
});
}
};
});
Java REST Web Services - Spring MVC:
@RequestMapping(value = "/downloadPDF...
How to sort a HashMap in Java [duplicate]
... them.
In any case, you can't have sorted values in HashMap (according to API This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time ].
Though you can push all these values to LinkedHashMap, for later use as we...