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What is a stack trace, and how can I use it to debug my application errors?
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In simple terms, a stack trace is a list of the method calls that the application was in the middle of when an Exception was thrown.
Simple Example
With the example given in the question, we can determine exactly where the exception was thrown in the application. Let's have a lo...
How fast is D compared to C++?
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To enable all optimizations and disable all safety checks, compile your D program with the following DMD flags:
-O -inline -release -noboundscheck
EDIT: I've tried your programs with g++, dmd and gdc. dmd does lag behind, but gdc ac...
CMake: How to build external projects and include their targets
...roject A's import file since it's only created once Project A has been installed.
If you want to include Project A's import file, you'll have to install Project A manually before invoking Project B's CMakeLists.txt - just like any other third-party dependency added this way or via find_file / find_...
Call a Server-side Method on a Resource in a RESTful Way
...ut SOAP envelopes and single-URI overloaded POST services), what some may call "lack of features", is actually its greatest strength. Right off the bat, HTTP asks you to have addressability and statelessness: the two basic design decisions that keep HTTP scalable up to today's mega-sites (and mega-s...
What does Provider in JAX-RS mean?
...tomizing the JAX-RS runtime. You can think of them as plugins that (potentially) alter the behavior of the runtime, in order to accomplish a set of (program defined) goals.
Providers are not the same as resources classes, they exist, conceptually, at a level in-between resources classes and the JAX...
What are the differences between a HashMap and a Hashtable in Java?
...shMap better for non-threaded applications, as unsynchronized Objects typically perform better than synchronized ones.
Hashtable does not allow null keys or values. HashMap allows one null key and any number of null values.
One of HashMap's subclasses is LinkedHashMap, so in the event that you'd wa...
ctypes - Beginner
...o testlib.so -fPIC testlib.c
# or... for Mac OS X
$ gcc -shared -Wl,-install_name,testlib.so -o testlib.so -fPIC testlib.c
Then, write a wrapper using ctypes:
testlibwrapper.py
import ctypes
testlib = ctypes.CDLL('/full/path/to/testlib.so')
testlib.myprint()
Now execute it:
$ python testlibwrap...
What jsf component can render a div tag?
...if you want to wrap any of your JSF code with the div tag.
Alternatively, all the major UI Frameworks have a div component tag, or you could write your own.
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What's the difference between deadlock and livelock?
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All the content and examples here are from
Operating Systems: Internals and Design Principles
William Stallings
8º Edition
Deadlock: A situation in which two or more processes are unable to proceed because each is waiting ...
How to loop through a HashMap in JSP?
...ose <% %> things) are considered a poor practice. I recommend to install JSTL (just drop the JAR file in /WEB-INF/lib and declare the needed taglibs in top of JSP). It has a <c:forEach> tag which can iterate over among others Maps. Every iteration will give you a Map.Entry back which in ...