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What is ActiveMQ used for - can we apply messaging concept using a Database?
I looked it up and it used to send messages between 2 systems.
But why? Why wouldn't you just use a Database ?
There must be some feature that ActiveMQ has that Databases do not?
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Remove multiple keys from Map in efficient way?
I have a Map<String,String> with large number of key values pairs. Now I want to remove selected keys from that Map . Following code shows what I did to achieve that.
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Merge PDF files
Is it possible, using Python, to merge separate PDF files?
9 Answers
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
... am looking for a way to concatenate the strings of a field within a group by query. So for example, I have a table:
14 Ans...
Understanding colors on Android (six characters)
...ing to understand how colors work in Android. I have this color set as the background of my LinearLayout , and I get a background gray with some transparency:
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How to make a valid Windows filename from an arbitrary string?
I've got a string like "Foo: Bar" that I want to use as a filename, but on Windows the ":" char isn't allowed in a filename.
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How do I get time of a Python program's execution?
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Peter Mortensen
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answered Oct 13 '09 at 0:00
rogeriopvlrogeriopvl
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Learning Regular Expressions [closed]
... them to me in an easy-to-follow manner? If there are any online tools or books, could you also link to them?
1 Answer
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NullPointerException in Java with no StackTrace
I've had instances of our Java code catch a NullPointerException , but when I try to log the StackTrace (which basically ends up calling Throwable.printStackTrace() ), all I get is:
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Unicode character in PHP string
This question looks embarrassingly simple, but I haven't been able to find an answer.
8 Answers
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