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Spring is one of the most elegant frameworks that’s used by most Java enterprise application developers. It has made the life of Java developers a lot easier. The fundamental functionality provided by the Spring Container is dependency injection.

During the design, there are various types of issues that we may face due to poor class designs or inappropriate use of associations. One of the common issues we see when we use dependency injection is the Circular dependency issue.

Circular dependency happens when two beans are dependent on each other during instantiation. Given below is a small example of a circular dependency in spring.

In such situations, spring throws an exception as shown below.

1. Using setter injection

Using @Autowired at the setter method of the dependent bean instead of the constructor injunction solves the issue. In this case, Spring creates the beans, however, the dependencies are not injected until they are first used.

2. Using @Lazy at the injection point

A quick way to solve circular dependency is by adding @Lazy at the constructor injection point. It sets the dependency lazily. Spring uses a proxy instead of the real object at the injection point. This proxy delays the initialization of the underlying object until it is first used.

3. Using @PostContruct

@PostConstruct on a method will be invoked once the bean is instantiated. Using @Autowired on one of the beans and use a init method with @PostConstruct annotation. Init method will set the bean to the dependent bean.

4. Redesign

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In this exercise, you were given a scenario in which there was a problem with a component you were creating on a CNC machine. You were then asked how you wanted to proceed. Depending on your path through this exercise, you might have found an easy solution and fixed it yourself, asked for help and worked with your trainer, or discovered an ongoing G-code problem that was bigger than you initially thought.

When issues and problems arise, it is important that they are addressed in an efficient and timely manner. Communication is an important tool because it can prevent problems from recurring, avoid injury to personnel, reduce rework and scrap, and ultimately, reduce cost, and save money. Although, each path in this exercise ended with a description of a problem solving tool for your toolbox, the first step is always to identify the problem and define the context in which it happened.

There are several strategies that can be used to identify the root cause of a problem. Root cause analysis (RCA) is a method of problem solving that helps people answer the question of why the problem occurred. RCA uses a specific set of steps, with associated tools like the “5 Why Analysis" or the “Cause and Effect Diagram,” to identify the origin of the problem, so that you can:

Once the underlying cause is identified and the scope of the issue defined, the next step is to explore possible strategies to fix the problem.

If you are not sure how to fix the problem, it is okay to ask for help. Problem solving is a process and a skill that is learned with practice. It is important to remember that everyone makes mistakes and that no one knows everything. Life is about learning. It is okay to ask for help when you don’t have the answer. When you collaborate to solve problems you improve workplace communication and accelerates finding solutions as similar problems arise.

One tool that can be useful for generating possible solutions is brainstorming. Brainstorming is a technique designed to generate a large number of ideas for the solution to a problem. The method was first popularized in 1953 by Alex Faickney Osborn in the book Applied Imagination. The goal is to come up with as many ideas as you can, in a fixed amount of time. Although brainstorming is best done in a group, it can be done individually.

Depending on your path through the exercise, you may have discovered that a couple of your coworkers had experienced similar problems. This should have been an indicator that there was a larger problem that needed to be addressed.

In any workplace, communication of problems and issues (especially those that involve safety) is always important. This is especially crucial in manufacturing where people are constantly working with heavy, costly, and sometimes dangerous equipment. When issues and problems arise, it is important that they be addressed in an efficient and timely manner. Effective communication is an important tool because it can prevent problems from recurring, avoid injury to personnel, reduce rework and scrap, and ultimately, reduce cost and save money.

One strategy for improving communication is the huddle. Just like football players on the field, a huddle is a short meeting with everyone standing in a circle. A daily team huddle is a great way to ensure that team members are aware of changes to the schedule, any problems or safety issues are identified and that team members are aware of how their work impacts one another. When done right, huddles create collaboration, communication, and accountability to results. Impromptu huddles can be used to gather information on a specific issue and get each team member's input.

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