It is apparent in the heap dump I got when investigating JDK-8345302 that javac compilation of JDK benchmarks corpus takes significant memory holding String literals referenced in JMH generated code. About 0.6% of them are these top three:

$ java -jar jol-cli-latest.jar heapdump-strings make/java_pid72581.hprof

Heap dump contains 24.074.729 objects, 1.044.366.688 bytes in total.

=== Duplicate Strings
  DUPS: Number of duplicated String instances
  SIZE (V): Savings due to String.value dedup (automatic by GC)
  SIZE (S+V): Savings due to entire String dedup (manual)

Table is sorted by "DUPS".
Printing first 30 lines. Use -DprintFirst=# to override.
          
            DUPS SIZE (V) SIZE (S+V) VALUE
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          17.511 1.540.968 1.961.232 Yes, I am Stephen Hawking, and k... (69 chars)
          17.499 1.399.920 1.819.896 Harness failed to distribute thr... (58 chars)
          17.499 1.959.888 2.379.864 Today's password is swordfish. I... (91 chars)
...
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