headerName.setValue("header");
        Xpp3Dom headerValue = new Xpp3Dom("value");
        headerValue.setValue("value");
        property.addChild(headerName);
        property.addChild(headerValue);
        httpHeaders.addChild(property);
        httpConfiguration.addChild(httpHeaders);

        server.setConfiguration(httpConfiguration);

        MavenExecutionRequest request = new DefaultMavenExecutionRequest();

        configuration.addChild("uri", "${session.rootDirectory.uri}");
        configuration.addChild("path", "${session.rootDirectory}");
        configuration.addChild("uriString", "${session.rootDirectory.uri.string}");
        configuration.addChild("uriAsciiString", "${session.rootDirectory.uri.ASCIIString}");
        configuration.addChild("pathString", "${session.rootDirectory.string}");

        configuration.addChild("uri", "${session.rootDirectory.uri}");
        configuration.addChild("path", "${session.rootDirectory}");
        configuration.addChild("uriString", "${session.rootDirectory.uri.string}");
        configuration.addChild("uriAsciiString", "${session.rootDirectory.uri.ASCIIString}");
        configuration.addChild("pathString", "${session.rootDirectory.string}");

            if (tree == null) {
                tree = node;
            }

            if (parent != null) {
                parent.setNChildren(1);
                parent.addChild(0, node);
            }

            parent = node;
        }
        return tree;
    }

    public void setClasspath(List<ArtifactMetadata> classpath) {
        this.classpath = classpath;
    }

    }

    public XmlPlexusConfiguration(XmlNode node) {
        super(node.getName(), node.getValue());
        node.getAttributes().forEach(this::setAttribute);
        node.getChildren().forEach(c -> this.addChild(new XmlPlexusConfiguration(c)));
    }

    @Override
    public String toString() {
        final StringBuilder buf = new StringBuilder().append('<').append(getName());

        tm1.addProvide("vendor", "sun");
        Xpp3Dom configuration1 = new Xpp3Dom("configuration");
        Xpp3Dom jdkHome1 = new Xpp3Dom("jdkHome");
        jdkHome1.setValue("${env.JAVA_HOME}");
        configuration1.addChild(jdkHome1);
        tm1.setConfiguration(configuration1);

        ToolchainModel tm2 = new ToolchainModel();
        tm1.setType("jdk");
        tm1.addProvide("version", "1.4");

        this(new ArtifactMetadata(af), parent, resolved, scope);
    }

    // ------------------------------------------------------------------------
    public void addChild(int index, MetadataTreeNode kid) {
        if (kid == null) {
            return;
        }

        if (children == null) {
            children = new MetadataTreeNode[nChildren];
        }

        t1s1.setInputLocation("t1s1");

        t1.addChild(t1s1);

        // create the recessive DOM
        Xpp3Dom t2 = new Xpp3Dom("top");
        t2.setInputLocation("t2top");

        Xpp3Dom t2s1 = new Xpp3Dom("topsub1");
        t2s1.setValue("t2s1Value");
        t2s1.setInputLocation("t2s1");

        t2.addChild(t2s1);

        // merge and check results.

        Xpp3Dom configurationChild = new Xpp3Dom("jdkHome");
        configurationChild.setValue("${env.testKey}");
        Xpp3Dom configuration = new Xpp3Dom("configuration");
        configuration.addChild(configurationChild);
        ToolchainModel toolchain = new ToolchainModel();
        toolchain.setType("TYPE");
        toolchain.setProvides(props);
        toolchain.setConfiguration(configuration);

public abstract PlexusConfiguration getChild(int); public abstract PlexusConfiguration getChild(String, boolean); public abstract PlexusConfiguration[] getChildren(); public abstract PlexusConfiguration[] getChildren(String); public abstract void addChild(PlexusConfiguration); public abstract int getChildCount(); } org/codehaus/plexus/configuration/PlexusConfigurationE.class package org.codehaus.plexus.configuration; public synchronized class PlexusConfigurationE extends Exception { private static...