this.explicitTargetBytecodeVersion = explicitTargetBytecodeVersion;
    }

    public List<DefaultIdeaDependency> getDependencies() {
        return dependencies;
    }

    public void setDependencies(List<DefaultIdeaDependency> dependencies) {
        this.dependencies = ImmutableList.copyOf(dependencies); // also ensures it's serializable
    }

Class <org.gradle.plugins.ide.internal.tooling.idea.DefaultIdeaDependency> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (DefaultIdeaDependency.java:0)