ideaProject.javaLanguageSettings.targetBytecodeVersion == JavaVersion.VERSION_1_5
        ideaProject.modules.find { it.name == 'test-project' }.javaLanguageSettings.targetBytecodeVersion == null
        ideaProject.modules.find { it.name == 'child1' }.javaLanguageSettings.targetBytecodeVersion == null
        ideaProject.modules.find { it.name == 'child2' }.javaLanguageSettings.targetBytecodeVersion == null
    }

        IdeaLanguageLevel languageLevel = resolveRootLanguageLevel(ideaProjectExt, allIsolatedIdeaModules);
        JavaVersion targetBytecodeVersion = resolveRootTargetBytecodeVersion(ideaProjectExt, allIsolatedIdeaModules);

        DefaultIdeaProject out = buildWithoutChildren(ideaProjectExt, languageLevel, targetBytecodeVersion);

        // Important to build GradleProject after the IsolatedIdeaModuleInternal requests,

        "target" | "targetCompatibility" | "targetBytecodeVersion" | "java"      | JavaBasePlugin
        "source" | "sourceCompatibility" | "sourceLanguageLevel"   | "scala"     | ScalaBasePlugin
        "target" | "targetCompatibility" | "targetBytecodeVersion" | "scala"     | ScalaBasePlugin

        originalIdeaModel.javaLanguageSettings.targetBytecodeVersion == JavaVersion.VERSION_1_8
        originalIdeaModel.modules.name == ["root", "lib1", "lib2"]
        originalIdeaModel.modules[1].javaLanguageSettings.languageLevel == JavaVersion.VERSION_1_7
        originalIdeaModel.modules[1].javaLanguageSettings.targetBytecodeVersion == JavaVersion.VERSION_1_7

     */
    public JavaVersion getTargetBytecodeVersion() {
        return targetBytecodeVersion;
    }

    public void setTargetBytecodeVersion(JavaVersion targetBytecodeVersion) {
        this.targetBytecodeVersion = targetBytecodeVersion;
    }

    /**
     * The vcs for the project.
     * <p>

     */
    public JavaVersion getTargetBytecodeVersion() {
        return targetBytecodeVersion;
    }

    public void setTargetBytecodeVersion(JavaVersion targetBytecodeVersion) {
        this.targetBytecodeVersion = targetBytecodeVersion;
    }

    /**
     * See {@link #iml(Action)}
     */
    public IdeaModuleIml getIml() {
        return iml;

                    return new IdeaLanguageLevel(maxSourceCompatibility);
                }

            });
            conventionMapping.map("targetBytecodeVersion", new Callable<JavaVersion>() {
                @Override
                public JavaVersion call() {
                    return getMaxJavaModuleCompatibilityVersionFor(TARGET_COMPATIBILITY);
                }