Think of WASM as a kinda universal library target. You can compile C, Rust, C#, Java to WASM, and then you can use it in a different language from the source. This way, Java can run C or Rust code without going through a FFI (foreign function interface). From the article, one example is porting tree-sitter (a C library) to Java by first compiling it to WASM, then use Endive to access its function.
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Think of WASM as a kinda universal library target. You can compile C, Rust, C#, Java to WASM, and then you can use it in a different language from the source. This way, Java can run C or Rust code without going through a FFI (foreign function interface). From the article, one example is porting tree-sitter (a C library) to Java by first compiling it to WASM, then use Endive to access its function.
As an example of how it can be used, you can look at https://github.com/Christopher-Chianelli/timefold-wasm-servi... and https://github.com/Christopher-Chianelli/timefold-wasm-c-cli..., which was an experiment I did to try using C code inside Timefold Solver (a Java library that can be used to solve constraint problems like Employee Scheduling and Vehicle Routing).
Something like UNCOL (https://en.wikipedia.org/wiki/UNCOL), EM-1 (https://en.wikipedia.org/wiki/Amsterdam_Compiler_Kit), TIMI (https://developer.ibm.com/articles/i-newtoibmi),...