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Set up environment-specific configuration files: Create configuration files for each environment (e.g. dev, qa, prod). These files should contain the environment-specific configurations such as database connections, API keys, etc.
Define build profiles: Define build profiles in Maven or Gradle for each environment based on the environment-specific configuration files.
Use environment variables: Use environment variables to determine which build profile to use. This can be done by setting an environment variable such as ENVIRONMENT_NAME to the name of the environment (e.g. dev, qa, prod).
Configure Maven or Gradle to build separate jars: Configure Maven or Gradle to build separate jars for each environment using the appropriate build profile. For example, in Maven, the command "mvn clean install -P dev" would build a jar with the dev configuration.
Deploy the appropriate jar: Deploy the appropriate jar to each environment based on the environment-specific configurations. This can be done manually or using a continuous integration/continuous deployment (CI/CD) tool.