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Persistence unit as RESOURCE_LOCAL or JTA?
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JPA implementations have the choice of managing transactions themselves (RESOURCE_LOCAL), or having them managed by the application server's JTA implementation.
In most cases, RESOURCE_LOCAL is fine. This would use basic JDBC-level t...
Java code To convert byte to Hexadecimal
...ral answers here uses Integer.toHexString(int); this is doable, but with some caveats. Since the parameter is an int, a widening primitive conversion is performed to the byte argument, which involves sign extension.
byte b = -1;
System.out.println(Integer.toHexString(b));
// prints "fff...
Java, Classpath, Classloading => Multiple Versions of the same jar/project
...stion for experienced coders. But I have a library (an http client) that some of the other frameworks/jars used in my project require. But all of them require different major versions like:
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Why does Clojure have “keywords” in addition to “symbols”?
I have a passing knowledge of other Lisps (particularly Scheme) from way back. Recently I've been reading about Clojure . I see that it has both "symbols" and "keywords". Symbols I'm familiar with, but not with keywords.
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Are there benefits of passing by pointer over passing by reference in C++?
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A pointer can receive a NULL parameter, a reference parameter can not. If there's ever a chance that you could want to pass "no object", then use a pointer instead of a reference.
Also, passing by pointer allows you to explicitly see at the call site wheth...
Dictionary vs Object - which is more efficient and why?
What is more efficient in Python in terms of memory usage and CPU consumption - Dictionary or Object?
8 Answers
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Android Studio IDE: Break on Exception
...eption and Uncaught exception selected
Define filters that specify namespaces of libraries that the debugger should break on: Check the Class filters checkbox to enable class filtering (as mentioned by @Scott Barta). Then click the ... (elipsis) button to open the Class Filters dialog. Specify...
Why wasn't PyPy included in standard Python?
...nline Python distributions. Wouldn't things like JIT compilation and lower memory footprint greatly improve the speeds of all Python code?
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What is Linux’s native GUI API?
...dow server; there is also XCB.
Toolkit libraries such as GTK+ (used by GNOME) and Qt (used by KDE), built on top of Xlib, are used because they are easier to program with. For example they give you a consistent look and feel across applications, make it easier to use drag-and-drop, provide componen...
Custom Adapter for List View
...te a custom adapter for my list view. Is there any article that can walk me through how to create one and also explain how it works?
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