Java String.substring method potential memory leak?

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There is a potential for a memory leak, if you take a substring of a sizable string and not make a copy (usually via the String(String) constructor).

Note that this has changed since Java 7u6.
See https://bugs.openjdk.java.net/browse/JDK-7197183.

The original assumptions around the String object implementing a flyweight pattern are no longer regarded as valid.

See this answer for more info.

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