Why Context.getCommandContext() is null?

Camunda 7 Topics Discussion & Questions
1

my code "Context.getCommandContext() " return null

package com.eurekabio.BIAP.WFS.implemention;

import org.camunda.bpm.engine.impl.cfg.TransactionState;
import org.camunda.bpm.engine.impl.context.Context;
import org.springframework.context.annotation.Configuration;

@Configuration
public class TransactionListener {

    public TransactionListener(){

        Context.getCommandContext().getTransactionContext().addTransactionListener(TransactionState.COMMITTED, commandContext -> {
               System.out.println(commandContext.getCurrentJob().getExecution().getPersistentState());
        });

    }
}
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