No, usually you cannot "destroy a link from a string pool in Java" manually.
, , , , . Java 6 PermGen - , . , PermGen , . Java 6 - PermGen. PermGen . -XX: MaxPermSize = N. .
Java 7 - . , . , .
, -XX: StringTableSize = N.
, - XX: + PrintStringTableStatistics JVM. , .
JDK jmap, .
jmap -heap process_id
:
jmap -heap 18974
, " xxxxxx , xxxxxx."
String , . , String, , , , , , .
, . , (, Class.forName(...)), , . , String , , , GC'ed.