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With inspiration from other libraries

There is a newer version: 2.12.15

package io.virtdata.core;

import io.virtdata.processors.DocFuncData;

import java.util.ArrayList;
import java.util.List;
import java.util.ServiceLoader;
import java.util.stream.Collectors;

public class VirtDataFunctionFinder {
    public VirtDataFunctionFinder() {
    }

    public List getFunctionNames() {

        ServiceLoader loader =ServiceLoader.load(DocFuncData.class);
        List names = new ArrayList<>();
        loader.iterator().forEachRemaining(d -> names.add(d.getPackageName() + "." + d.getClassName()));
        List cleaned = names.stream().sorted().distinct().collect(Collectors.toList());
        return cleaned;
    }
}