![]() DEDUPLICATOR JAVA APP CODEIf you have ever optimized your code by using String.intern() method then you know that it's not easy. Just enable this feature using JVM parameters and you are done. by using intern() method of class? Well, this approach has an advantage because you don't need to write a single line of code. Now, you might be thinking that how does this method compare with the traditional way to reduce memory due to duplicate String e.g. The default value of this parameter is 3. The minimal age of processed String is controlled by -XX:StringDeduplicationAgeThreshold=3 option. String deduplication also doesn't consider relatively young String for processing. It means just providing -XX:+UseStringDeduplication will not work, you also need to turn on the G1 garbage collector using -XX:+UseG1GC option. Unfortunately, String deduplication is only available for the G1 garbage collector, so if you are not using G1 GC then you cannot use the String deduplication feature. You can enable the String deduplication feature by using -XX:+UseStringDeduplication option. String deduplication is not enabled by default in Java 8 JVM. How to enable String deduplication in Java 8 It's also very affordable and you can buy in just $10 on Udemy sales which happen every now and then. Anyway, In this article, you will see how you can enable this feature in Java 8 to reduce memory consumed by duplicate String objects.ītw, if you are not familiar with new features on Java 8 then I suggest you first go through a comprehensive and up-to-date Java course like The Complete Java MasterClass on Udemy. DEDUPLICATOR JAVA APP UPDATEInstead of each String object pointing to its own character array, identical String objects can point to the same character array.ītw, this is not exactly the same as it was before Java 7 update 6, where substring also points to the same character array, but can greatly reduce memory occupied by duplicate String in JVM. It reduces the memory footprint of String objects on the Java Heap space by taking advantage of the fact that many String objects are identical. The String deduplication is trying to bridge that gap. The bug was fixed in JDK 7, but it created this new problem. If you remember, earlier both substring and String share the same character objects (see how Substring works in Java), which was actually a bug that had the potential to cause a serious memory leak. ![]()
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