if (toolchainsSource == null) {
            return PersistedToolchains.newInstance();
        }

        PersistedToolchains toolchains;

        try {
            try {
                InputStream is = toolchainsSource.openStream();
                if (is == null) {
                    return PersistedToolchains.newInstance();
                }

        PersistedToolchains toolchains = null;

        if (userToolchainsFile != null && userToolchainsFile.isFile()) {
            try (InputStream in = Files.newInputStream(userToolchainsFile.toPath())) {
                toolchains = new PersistedToolchains(new MavenToolchainsStaxReader().read(in));
            } catch (Exception e) {

    }

    @Nonnull
    @Override
    public ToolchainsBuilderResult build(ToolchainsBuilderRequest request)
            throws ToolchainsBuilderException, IllegalArgumentException {
        try {
            DefaultToolchainsBuildingRequest req = new DefaultToolchainsBuildingRequest();
            if (request.getGlobalToolchainsSource().isPresent()) {
                req.setGlobalToolchainsSource(new MappedToolchainsSource(