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I believe that aforementioned “robust security model” was removed several years ago due to issues with its actual robustness https://openjdk.org/jeps/411 https:

• lmm 3y ago
  If you read your link, it was removed largely because the things that used it (such as Java Web Start) had been removed, which was more because they failed in the market than because its actual security record was particularly poor. (Yes, there were occasional sandbox escapes, but there are occasional sandbox escapes in web browsers too. Few security mechanisms are perfect)