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From Dawid Weiss <>
Subject Re: Several builds hanging pecause of permgen
Date Tue, 09 Jul 2013 07:51:43 GMT
> How do I get the number of interned Strings from jvisualvm?

Don't know about jvisualvm but:

"The jmap -permgen command prints statistics for the objects in the
permanent generation, including information about internalized String
instances. See   2.7.4 Getting Information on the Permanent

There's also a magic switch to hotspot that dumps those strings:

  product(bool, PrintStringTableStatistics, false,                          \
          "print statistics about the StringTable and SymbolTable")         \
  notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
          "print histogram of the symbol table")                            \


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