http outbound gateway not converting french characters - spring-integration

Question

I have my spring integration http outbound gateway something like this.I am using my own rest template for pooling connection with ssl.I was getting 500 with french character hence I am injecting both UTF-8 and supported media type to message converter.Now Before I was injecting my own request factory and default rest template After injecting both then it started accepting french characters.Now when i changed to use my own rest template it don't accept message converter and when i try to inject this to my rest template I get this exception
Cause is - Could not write request: no suitable HttpMessageConverter found for request type [java.lang.String] and content type [text/plain;charset=UTF-8]
This worked for all request
<int-http:outbound-gateway id='batch-http' header-mapper="headerMapper"
request-channel='toHttp'
request-factory="requestFactory"
message-converters="batchHTTPConverter"
url-expression="payload.contains('${filterAttribute}') ? '${url1}' : '${url2}'" http-method="${httpMethod}"
expected-response-type='java.lang.String' charset='${charset}'
reply-timeout='${replyTimeout}' reply-channel='output'>
</int-http:outbound-gateway>
<beans:bean id="batchHTTPConverter" class="org.springframework.http.converter.StringHttpMessageConverter">
<beans:constructor-arg index="0" value="UTF-8"/>
<beans:property name="supportedMediaTypes" value = "application/json;UTF-8" />
</beans:bean>
<beans:bean id="requestFactory" class="test.batch.httpclient.CustomClientHttpRequestFactory">
<beans:constructor-arg ref="verifier"/>
</beans:bean>
<beans:bean id="verifier"
class="batch.NullHostnameVerifier">
</beans:bean>
This is not working for french or any input request
<header-filter input-channel="input"
output-channel="inputX" header-names="x-death"/>
<service-activator input-channel="inputX" ref="gw" />
<gateway id="gw" default-request-channel="toHttp" default-reply-timeout="0" error-channel="errors" />
<beans:bean id="inputfields" class="testbatch.httpclient.HTTPInputProperties">
<beans:property name="nonRetryErrorCodes" value="${nonRetryErrorCodes}"/>
</beans:bean>
<beans:bean id="responseInterceptor" class="testbatch.httpclient.ResponseInterceptor">
<beans:property name="inputProperties" ref="inputfields" />
</beans:bean>
<chain input-channel="errors" output-channel="output">
<!-- examine payload.cause (http status code etc) and decide whether
to throw an exception or return the status code for sending to output -->
<header-filter header-names="replyChannel, errorChannel" />
<transformer ref="responseInterceptor" />
</chain>
<int-http:outbound-gateway id='batch-http' header-mapper="headerMapper"
request-channel='toHttp'
rest-template="batchRestTemplate"
url-expression="payload.contains('${filterAttribute}') ? '${url1}' : '${url2}'" http-method="${httpMethod}"
expected-response-type='java.lang.String' charset='${charset}'
reply-timeout='${replyTimeout}' reply-channel='output'>
</int-http:outbound-gateway>
<beans:bean id="batchHTTPConverter" class="org.springframework.http.converter.StringHttpMessageConverter" >
<beans:constructor-arg index="0" value="UTF-8"/>
<beans:property name="supportedMediaTypes" value = "application/json;UTF-8" />
</beans:bean>
<beans:bean id="batchRestTemplate" class="testbatch.httpclient.BatchRestTemplate" >
<beans:property name="batchHTTPConverter" ref="batchHTTPConverter"/>
</beans:bean>
<beans:bean id="requestFactory"
class="testbatch.httpclient.CustomClientHttpRequestFactory">
<beans:constructor-arg ref="verifier"/>
</beans:bean>
<beans:bean id="verifier"
class="testbatch.httpclient.NullHostnameVerifier">
</beans:bean>
<beans:bean id="headerMapper" class="org.springframework.integration.http.support.DefaultHttpHeaderMapper"
factory-method="outboundMapper">
<beans:property name="outboundHeaderNames" value="${mapHeaders}"/>
<beans:property name="userDefinedHeaderPrefix" value=""/>
</beans:bean>
<channel id="output" />
<channel id="input" />
<channel id="inputX" />
<channel id="toHttp" />
</beans:beans>
My rest template
public class BatchRestTemplate extends RestTemplate{
private static final Logger LOGGER = LoggerFactory
.getLogger(BatchRestTemplate.class);
private StringHttpMessageConverter batchHTTPConverter;
public StringHttpMessageConverter getBatchHTTPConverter() {
return batchHTTPConverter;
}
public void setBatchHTTPConverter(StringHttpMessageConverter batchHTTPConverter) {
this.batchHTTPConverter = batchHTTPConverter;
}
public BatchRestTemplate() {
super(createBatchHttpRequestFactory());
List<HttpMessageConverter<?>> messageConverters= new ArrayList<HttpMessageConverter<?>>();
messageConverters.addAll(getMessageConverters());
messageConverters.add(getBatchHTTPConverter());
super.setMessageConverters(messageConverters);
}
private static ClientHttpRequestFactory createBatchHttpRequestFactory() {
CloseableHttpClient httpClient;
HttpComponentsClientHttpRequestFactory httpRequestFactory;
final int timeout = 3000;
SSLConnectionSocketFactory socketFactory;
try {
socketFactory = new SSLConnectionSocketFactory(
SSLContext.getDefault(),
new String[] {"TLSv1"},
null,
SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create()
.register("http", PlainConnectionSocketFactory.getSocketFactory())
.register("https", socketFactory)
.build();
PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(socketFactoryRegistry);
cm.setMaxTotal(700);
cm.setDefaultMaxPerRoute(300);
cm.closeExpiredConnections();
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(timeout)
.setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build();
httpClient = HttpClients.custom().setDefaultRequestConfig(requestConfig).setConnectionManager(cm).build();
httpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
return httpRequestFactory;
}
catch (Exception e) {
LOGGER.debug("error exception", e);
}
return null;
}
}

Answer 1

You have a bug in your own code:
public BatchRestTemplate() {
..........
messageConverters.add(getBatchHTTPConverter());
..........
}
But... There is no batchHTTPConverter yet!. It will appear there only after setBatchHTTPConverter().
In other words you can't use the property from the constructor because setters are called latter after the object instantiating.