*             {@link JavaToolchainImpl} instead.
 */
@Deprecated
public class DefaultJavaToolChain extends JavaToolchainImpl {
    public static final String KEY_JAVAHOME = JavaToolchainImpl.KEY_JAVAHOME;

    public DefaultJavaToolChain(ToolchainModel model, Logger logger) {
        super(model, logger);
    }

    @Override
    public String getJavaHome() {

        if (model == null) {
            return null;
        }

        // use DefaultJavaToolChain for compatibility with maven 3.2.3 and earlier

        @SuppressWarnings("deprecation")
        JavaToolchainImpl jtc = new DefaultJavaToolChain(model, logger);

        // populate the provides section
        Properties provides = model.getProvides();

        jdkHome2.setValue("${env.JAVA_HOME}");
        configuration2.addChild(jdkHome2);
        tm2.setConfiguration(configuration2);

        DefaultToolchain tc1 = new DefaultJavaToolChain(tm1, null);
        DefaultToolchain tc2 = new DefaultJavaToolChain(tm2, null);

        assertEquals(tc1, tc1);
        assertNotEquals(tc1, tc2);
        assertNotEquals(tc2, tc1);
        assertEquals(tc2, tc2);
    }

import org.apache.maven.toolchain.model.ToolchainModel;
import org.apache.maven.utils.Os;
import org.slf4j.Logger;

/**
 * JDK toolchain implementation.
 *
 * @since 2.0.9, renamed from DefaultJavaToolChain in 3.2.4
 */
public class JavaToolchainImpl extends DefaultToolchain implements JavaToolchain {
    private String javaHome;

    public static final String KEY_JAVAHOME = "jdkHome"; // NOI18N