Custom gradle plugin extension field value fetched is null

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I have created a custom gradle plugin - TaskConfigPlugin

Gradle Version: 1.12/2.0 (Can’t upgrade as of now due to Org restrictions)

Java Version: 1.8

My Plugin code is as follows - TaskConfigPlugin.java >>

public class TaskConfigPlugin implements Plugin<Project> {

    private String taskPrefix;
    private Task mainTask;

    @Override
    public void apply(Project project) {
        TaskConfigPluginExtension extension = project.getExtensions()
                .create("taskOrder", TaskConfigPluginExtension.class);

        this.taskPrefix = extension.getTaskPrefix(); //the taskPrefix fetched is null
        this.mainTask = extension.getMainTask(); //mainTask fetched is null

        configureTaskOrdering(project);
    }


    private void configureTaskOrdering(Project project){
        // My Logic to order the task using 'dependsOn', 'mustRunAfter' etc
        // It uses the 'taskPrefix' to fetch all matching tasks and then 
        // establish the relationship with the 'mainTask'
    }
}

The extension object - TaskConfigPluginExtension.java >>

public class TaskConfigPluginExtension {

    private String taskPrefix;
    private Task mainTask;

    // getters and setters for the above

}

I have added the plugin info in the META-INF/gradle-plugins/TaskConfigPlugin.properties which contains the full package name of the Plugin.

The plugin is being consumed as follows in my gradle - mainConsumer.gradle

buildscript {
    repositories {
        flatDir name: 'libs', dirs: 'lib/'
    }
    dependencies {
        classpath ':TaskConfigPlugin:1.0'
    }
}

apply plugin: 'TaskConfigPlugin'

task mainConsumer

taskOrder {
    taskPrefix = 'setup'
    mainTask = mainConsumer
}

Now when I run my consuming gradle mainConsumer.gradle , I see that the taskPrefix and mainTask values fetched are NULL. I understand that they belong to the CONFIGURATION phase and hence the values cannot be fetched earlier. But I tried with the project.afterEvaluate option and that is also NOT working for me.

There are some solutions (hoping they work) in terms of Provider and Property but I can’t use them since they have been introduced with higher gradle versions, I guess 4.+

So, is there some solution or workaround for me with gradle 1.12 to fetch the extension values in the CONFIGURATION phase itself ?

Appreciate your response. Thanks in advance.