String xml = new DefaultToolchainsXmlFactory().toXmlString(persistedToolchains.getDelegate());
        ToolchainsBuildingRequest request = new DefaultToolchainsBuildingRequest();
        request.setUserToolchainsSource(new StringSource(xml));

        ToolchainsBuildingResult result = toolchainBuilder.build(request);
        assertNotNull(result.getEffectiveToolchains());

        return this;
    }

    @Override
    public Source getUserToolchainsSource() {
        return userToolchainsSource;
    }

    @Override
    public ToolchainsBuildingRequest setUserToolchainsSource(Source userToolchainsSource) {
        this.userToolchainsSource = userToolchainsSource;
        return this;
    }

     *
     * @param userToolchainsSource The user toolchains source, may be {@code null} to disable user toolchains.
     * @return This request, never {@code null}.
     */
    ToolchainsBuildingRequest setUserToolchainsSource(Source userToolchainsSource);

            toolchainsRequest.setGlobalToolchainsSource(new FileSource(installationToolchainsFile));
        }
        if (userToolchainsFile != null && userToolchainsFile.isFile()) {
            toolchainsRequest.setUserToolchainsSource(new FileSource(userToolchainsFile));
        }

        eventSpyDispatcher.onEvent(toolchainsRequest);

        slf4jLogger.debug(
                "Reading installation toolchains from '{}'",