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To prevent a memory leak, the JDBC Driver has been forcibly unregistered
...rivers:
// This manually deregisters JDBC driver, which prevents Tomcat 7 from complaining about memory leaks wrto this class
Enumeration<Driver> drivers = DriverManager.getDrivers();
while (drivers.hasMoreElements()) {
Driver driver = drivers.nextElement();
try {
DriverManage...
How to sort List of objects by some property
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What does compareTo() do? Where does it come from? Where do I have to define it?
– Asqiir
Jul 24 '17 at 12:58
1
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What is a race condition?
...act. You have no real way of knowing.
In order to prevent race conditions from occurring, you would typically put a lock around the shared data to ensure only one thread can access the data at a time. This would mean something like this:
// Obtain lock for x
if (x == 5)
{
y = x * 2; // Now, not...
Why are local variables not initialized in Java?
... warning is an awesome multi-path bad programmer checker that has saved me from doing stupid stuff since it checks every path and makes sure that if you used the variable in some path then you had to initialize it in every path that lead up to it. I now never explicitly initialize variables until I...
How do you dynamically add elements to a ListView on Android?
... If element in ArrayList is more complicated such as loading from Internet and each item contains image video and something like that,would this approach face performance hit?
– zionpi
Feb 18 '16 at 8:30
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How to change a field name in JSON using Jackson
...ation.JsonProperty in Jackson 2.x. Check which ObjectMapper you are using (from which version), and make sure you use the proper annotation.
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node.js fs.readdir recursive directory search
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Beware, the "parallel loop" answer from chjj above has a bug in cases when an empty folder is walked. The fix is: var pending = list.length; if(!pending)done(null, results); // add this line! list.forEach(function(file) { ...
– Vasil Dask...
Sequence-zip function for c++11?
...ers are not the same (it may crash or iterate beyond the end).
Starting from Boost 1.56.0 (2014 Aug 7) you could use boost::combine (the function exists in earlier versions but undocumented):
#include <boost/range/combine.hpp>
#include <vector>
#include <list>
#include <stri...
@Basic(optional = false) vs @Column(nullable = false) in JPA
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@Xie Jilei: From book: Java persistence with hibernate 2007, p. 179: @Basic(optional = false) @Column(nullable = false) The @Basic annotation marks the property as not optional on the Java object level. The second setting, nullable = f...
Java switch statement multiple cases
...esponsibility pattern
allows the separation of the source of
a request from deciding which of the
potentially large number of handlers
for the request should action it. The
class representing the chain role
channels the requests from the source
along the list of handlers until a
hand...