import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map.Entry;
import java.util.Properties;

import org.apache.maven.toolchain.MisconfiguredToolchainException;
import org.apache.maven.toolchain.RequirementMatcher;
import org.apache.maven.toolchain.RequirementMatcherFactory;
import org.apache.maven.toolchain.ToolchainFactory;

                try {
                    org.apache.maven.api.Toolchain v4Toolchain = v4Factory.createToolchain(model.getDelegate());
                    return getToolchainV3(v4Toolchain);
                } catch (ToolchainFactoryException e) {
                    throw new MisconfiguredToolchainException(e.getMessage(), e);
                }
            }

public class DefaultToolchainsBuilder implements ToolchainsBuilder {
    private final Logger logger = LoggerFactory.getLogger(getClass());

    @Override
    public PersistedToolchains build(File userToolchainsFile) throws MisconfiguredToolchainException {
        PersistedToolchains toolchains = null;

        if (userToolchainsFile != null && userToolchainsFile.isFile()) {
            try (InputStream in = Files.newInputStream(userToolchainsFile.toPath())) {

              <exclude>org.apache.maven.toolchain.DefaultToolchainManagerPrivate</exclude>
              <exclude>org.apache.maven.toolchain.MisconfiguredToolchainException</exclude>
              <exclude>org.apache.maven.toolchain.RequirementMatcher</exclude>
              <exclude>org.apache.maven.toolchain.RequirementMatcherFactory</exclude>