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Dealing with “java.lang.OutOfMemoryError: PermGen space” error
...classical example is Java.lang.OutOfMemoryError:PermGen Space in Tomcat.
Now there are two ways to solve this:
1. Find the cause of Memory Leak or if there is any memory leak.
2. Increase size of PermGen Space by using JVM param -XX:MaxPermSize and -XX:PermSize.
You can also check 2 Solution of J...
What is considered a good response time for a dynamic, personalized web application? [closed]
... response time is likely to be highly variable, since users will then not know what to expect.
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How to use Global Variables in C#?
...on't belong to any class).
This being said, the simplest approach that I know to mimic this feature consists in using a static class, as follows:
public static class Globals
{
public const Int32 BUFFER_SIZE = 512; // Unmodifiable
public static String FILE_NAME = "Output.txt"; // Modifiable...
Pros and cons of Java rules engines [closed]
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We are evaluating rules now for use with our application server. We have come across OpenRules, which is easy to integrate with Java and, as far as our testing has shown, fast enough. The main advantage of OpenRules above the others is the way the r...
How to check if hex color is “too black”?
...t; 40) {
// pick a different colour
}
EDIT
Since May 2014 tinycolor now has a getBrightness() function, albeit using the CCIR601 weighting factors instead of the ITU-R ones above.
EDIT
The resulting luma value range is 0..255, where 0 is the darkest and 255 is the lightest. Values greater t...
How to add a primary key to a MySQL table?
...g table. Otherwise it will be put at the end of the table as it is written now, which can be a little confusing when doing simple SELECT * ...
– StefanK
Apr 12 '19 at 6:45
...
Rethrowing exceptions in Java without losing the stack trace
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In Java 7 compiler for such rethrow is more inteligent. Now it works fine with specific "throws" exceptions in containing method.
– Waldemar Wosiński
Jan 29 '13 at 16:18
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How to Get Element By Class in JavaScript?
...
Of course, all modern browsers now support the following simpler way:
var elements = document.getElementsByClassName('someClass');
but be warned it doesn't work with IE8 or before. See http://caniuse.com/getelementsbyclassname
Also, not all browsers wi...
How to specify jackson to only use fields - preferably globally
...ty = JsonAutoDetect.Visibility.NONE
)
public @interface JsonExplicit {
}
Now you just have to annotate your classes with @JsonExplicit and you're good to go!
Also make sure to edit the above call to @JsonAutoDetect to make sure you have the values set to what works with your program.
Credit to h...
Execute method on startup in Spring
...to execute some methods when the application starts for the first time? I know that I can do the trick of setting a method with @Scheduled annotation and it executes just after the startup, but then it will execute periodically.
...