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Get keys from HashMap in Java
...ke BidiMap (a map that allows bidirectional lookup between key and values) from Apache's Commons Collections - also be aware that several different keys could be mapped to the same value.
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The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communicat
...tch and handle your server-side errors - do not let .NET exceptions travel from the server to the client - always wrap those into interoperable SOAP faults. Check out the WCF IErrorHandler interface and implement it on the server side
if you're about to send a second message onto your channel from t...
What is the purpose of mock objects?
...e to provide). The mock will indicate whether what really happens differs from what is supposed to happen. A custom mock object could be created from scratch for each test case to execute the expected behavior for that test case, but a mocking framework strives to allow such a behavior specificati...
Cannot import XSSF in Apache POI
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For OOXML to work you need the POI-OOXML jar which is separately packaged from the POI jar.
Download the POI-OOXML jar from the following location -
http://repo1.maven.org/maven2/org/apache/poi/poi-ooxml/3.11/poi-ooxml-3.11.jar
For Maven2 add the below dependency -
<dependency>
<gr...
How to analyze a java thread dump?
... explains what that waiting on means:
A lock prevents more than one entity from accessing a shared resource. Each object in Java™ has an associated lock (gained by using a synchronized block or method). In the case of the JVM, threads compete for various resources in the JVM and locks on Java obje...
filename and line number of python script
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Thanks to mcandre, the answer is:
#python3
from inspect import currentframe, getframeinfo
frameinfo = getframeinfo(currentframe())
print(frameinfo.filename, frameinfo.lineno)
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private[this] vs private
In Scala I see such feature as object-private variable. From my not very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in som...
Unlink of file Failed. Should I try again?
...could mean that another program is using the file, which is preventing git from "moving" the file into or out of the working directory when you are attempting to change branches.
I have had this happen on Windows Vista where eclipse is the program "using" the file. The file may not be actually ope...
Fastest way to get the first object from a queryset in django?
Often I find myself wanting to get the first object from a queryset in Django, or return None if there aren't any. There are lots of ways to do this which all work. But I'm wondering which is the most performant.
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How to get String Array from arrays.xml file
I am just trying to display a list from an array that I have in my arrays.xml . When I try to run it in the emulator, I get a force close message.
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