#fixed code
                             @Test
	void authenticationStepsShouldAuthenticatePushModeWithProvidedSecretId() {

		String roleId = getRoleId("with-secret-id");
		String secretId = "hello_world_two";

		VaultResponse customSecretIdResponse = getVaultOperations().write(
				"auth/approle/role/with-secret-id/custom-secret-id",
				Collections.singletonMap("secret_id", secretId));

		AppRoleAuthenticationOptions options = AppRoleAuthenticationOptions.builder()
				.roleId(RoleId.provided(roleId)).secretId(SecretId.provided(secretId))
				.build();

		AuthenticationStepsExecutor executor = new AuthenticationStepsExecutor(
				AppRoleAuthentication.createAuthenticationSteps(options), prepare()
						.getRestTemplate());

		assertThat(executor.login()).isNotNull();

		getVaultOperations().write(
				"auth/approle/role/with-secret-id/secret-id-accessor/destroy",
				customSecretIdResponse.getRequiredData());
	}
#vulnerable code 
                             @Test
	void authenticationStepsShouldAuthenticatePushModeWithProvidedSecretId() {

		String roleId = getRoleId("with-secret-id");
		String secretId = "hello_world_two";

		VaultResponse customSecretIdResponse = getVaultOperations().write(
				"auth/approle/role/with-secret-id/custom-secret-id",
				Collections.singletonMap("secret_id", secretId));

		AppRoleAuthenticationOptions options = AppRoleAuthenticationOptions.builder()
				.roleId(roleId).secretId(secretId).build();

		AuthenticationStepsExecutor executor = new AuthenticationStepsExecutor(
				AppRoleAuthentication.createAuthenticationSteps(options), prepare()
						.getRestTemplate());

		assertThat(executor.login()).isNotNull();

		getVaultOperations().write(
				"auth/approle/role/with-secret-id/secret-id-accessor/destroy",
				customSecretIdResponse.getRequiredData());
	} 
                            #location 22 
                            #vulnerability type NULL_DEREFERENCE