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Since Java's default string interning has got a lot of bad press, I am looking for an alternative. Can you suggest an API which is a good alternative to Java string interning? My application uses Java 6. My requirement is mainly to avoid duplicate strings via interning. Regarding the bad press: String intern is implemented via a native method. And the C implementation uses a fixed size of some 1k entries and scales very poorly for large number of strings. Java 6 stores interned strings in Perm gen. And therefore are not GC'd and possibly lead to perm gen errors. I know this is fixed in java 7 but I can't upgrade to java 7. Why do I need to use intering? My application is a server app with heap size of 10-20G for different deployments. During profiling we have figured that hundrends of thousands of string are duplicates and we can significantly improve the memory usage by avoiding storing duplicate strings. Memory has been a bottleneck for us and therefore we are targetting it rather than doing any premature optimization.

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