No, you could definitly call into native DLLs from a Java applet. Everything had to be code-signed, and at some point a permission popup was introduced, but it

No, you could definitly call into native DLLs from a Java applet. Everything had to be code-signed, and at some point a permission popup was introduced, but it totally worked (that's how I "integrated" a Windows D3D game written in C++ into browsers ca 2010 until Chrome removed Java plugin support).