I am trying to secure my Kafka streams application (Java Springboot) with SASL_PLAINTEXT mechanism.

This is my docker-compose file

version: '3'
services:    
  zookeeper:
    container_name: zookeeper
    image: confluentinc/cp-zookeeper:7.6.1
    ports:
      - '32181:32181'
    environment:
      ZOOKEEPER_CLIENT_PORT: 32181
      ZOOKEEPER_TICK_TIME: 2000
      KSQL_SECURITY_PROTOCOL: SASL_SSL
      KSQL_SASL_MECHANISM: PLAIN
      KSQL_SASL_JAAS_CONFIG: "org.apache.kafka.common.security.plain.PlainLoginModule required username="admin" password="admin";" 
  
    
  kafka:
    container_name: kafka-broker
    image: confluentinc/cp-kafka:7.3.0
    depends_on:
      - zookeeper
    ports:
      - '9092:9092'
      - '9997:9997'
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: 'zookeeper-1:32181'
      ZOOKEEPER_SASL_ENABLED: false
      #KAFKA_ADVERTISED_LISTENERS: 'PLAINTEXT://kafka0:29092,PLAINTEXT_HOST://localhost:9092'      
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:29092,SASL_PLAINTEXT://localhost:9097'
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: 'PLAINTEXT:PLAINTEXT,SASL_PLAINTEXT:SASL_PLAINTEXT'
      KAFKA_SECURITY_INTER_BROKER_PROTOCOL: SASL_PLAINTEXT
      KAFKA_SASL_MECHANISM_INTER_BROKER_PROTOCOL: PLAIN
      KAFKA_SASL_ENABLED_MECHANISMS: PLAIN
      KAFKA_OPTS: "-Djava.security.auth.login.config=/etc/kafka/configs/kafka_server_jaas.conf"      
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      network_mode: "host"
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
        #JMX_PORT: 9997
      KAFKA_JMX_OPTS: '-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=kafka0'
    volumes:
      - ./configs:/etc/kafka/configs 
  
  kafka-ui:
    container_name: kafka-ui
    image: 'provectuslabs/kafka-ui:latest'
    ports:
      - '8999:8080'
    depends_on:
      - zookeeper
      - kafka0      
    environment:
      KAFKA_CLUSTERS_0_NAME: local
      KAFKA_CLUSTERS_0_BOOTSTRAPSERVERS: 'kafka0:29092'
      KAFKA_CLUSTERS_0_ZOOKEEPER: 'zookeeper-1:32181'
      KAFKA_CLUSTERS_0_JMXPORT: 9997  

Content of kafka_server_jaas.conf

KafkaServer {
   org.apache.kafka.common.security.plain.PlainLoginModule required
   username="kafkabroker"
   password="kafkabroker-secret"
   user_kafkabroker="kafkabroker-secret"
   user_kafka-broker-metric-reporter="kafkabroker-metric-reporter-secret"
   user_client="client-secret";
};

Client {
   org.apache.zookeeper.server.auth.DigestLoginModule required
   username="kafka"
   password="kafka-secret";
};

This is what i setup in application.properties file of java springboot maven project

sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username="admin" password="admin";
zookeeper.connect=127.0.0.1:32181

kafka.security.protocol=SASL_PLAINTEXT
kafka.sasl.mechanism=PLAIN
kafka.sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username="admin" password="admin";

What am I doing wrong? Or what is the step by step way to configure this simple security mechanism? If anything is missing, I will update my question.