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Using Compact Strings

Looking for Zing? The Azul Zing Virtual Machine is now Azul Zulu Prime Builds of OpenJDK and part of Azul Platform Prime. Learn more.

Azul Platform Prime supports JEP 254, the compact strings optimization.

The compact strings feature of the Azul Platform Prime lowers memory footprint, improves performance of string-intensive applications, and reduces time spent on garbage collection.

To enable or disable the feature, use the following option:

 =-XX:[+/-]CompactStrings 
Note
Compact strings change internal representation of all strings from char[] to byte[], and changes the String class layout. If your application accesses java.lang.String fields via reflection or is unsafe, you may observe incorrect application behavior.