[BUG] Resteasy Response object not closed after API call

[MikeEdgar]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Resteasy client template does not close the Response (implements AutoCloseable).

openapi-generator/modules/openapi-generator/src/main/resources/Java/libraries/resteasy/ApiClient.mustache

Lines 675 to 723 in 2252040

	Response response = null;
	if ("GET".equals(method)) {
	response = invocationBuilder.get();
	} else if ("POST".equals(method)) {
	response = invocationBuilder.post(entity);
	} else if ("PUT".equals(method)) {
	response = invocationBuilder.put(entity);
	} else if ("DELETE".equals(method)) {
	response = invocationBuilder.method("DELETE", entity);
	} else if ("PATCH".equals(method)) {
	response = invocationBuilder.method("PATCH", entity);
	} else if ("HEAD".equals(method)) {
	response = invocationBuilder.head();
	} else if ("OPTIONS".equals(method)) {
	response = invocationBuilder.options();
	} else if ("TRACE".equals(method)) {
	response = invocationBuilder.trace();
	} else {
	throw new ApiException(500, "unknown method type " + method);
	}
	statusCode = response.getStatusInfo().getStatusCode();
	responseHeaders = buildResponseHeaders(response);
	if (response.getStatus() == Status.NO_CONTENT.getStatusCode()) {
	return null;
	} else if (response.getStatusInfo().getFamily().equals(Status.Family.SUCCESSFUL)) {
	if (returnType == null)
	return null;
	else
	return deserialize(response, returnType);
	} else {
	String message = "error";
	String respBody = null;
	if (response.hasEntity()) {
	try {
	respBody = String.valueOf(response.readEntity(String.class));
	message = respBody;
	} catch (RuntimeException e) {
	// e.printStackTrace();
	}
	}
	throw new ApiException(
	response.getStatus(),
	message,
	buildResponseHeaders(response),
	respBody);
	}

openapi-generator version

6.0.1

OpenAPI declaration file content or url

N/A

Generation Details

N/A

Steps to reproduce

N/A

Related issues/PRs

N/A

Suggest a fix

Handle the Response using try-with-resources, such as: https://github.com/MikeEdgar/openapi-generator/blob/06e93fabbfd66cd4f0f26d47bfba32a9ce3992d4/modules/openapi-generator/src/main/resources/Java/libraries/resteasy/ApiClient.mustache#L675-L730

[wing328]

@MikeEdgar thanks for reporting the issue. Can you please file a PR with the suggested change?