no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]

Question

I am calling service using Spring Integration and service returns byte array but getting below error.

public ResponseEntity<byte[]> getInvoiceResponse(Long id, Long releaseId) throws Exception {

    ByteArrayOutputStream stream = (ByteArrayOutputStream) Client.getInvoice(id,sellerId);

    final HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    return new ResponseEntity<byte[]>(stream.toByteArray(), headers, HttpStatus.CREATED);
}

<bean id="byteArrayMessageConverter" class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
<int-http:inbound-gateway id="invoiceAPIEndoint" request-channel="httpRequestinvoiceAPIEndpointChannel"
                      supported-methods="GET"
                      path="/seller/invoice/{sellerId}/{orderReleaseId}/" message-converters="byteArrayMessageConverter" >


<int-http:header name="releaseId" expression="#pathVariables.orderReleaseId"/>
<int-http:header name="sellerId" expression="#pathVariables.id"/>
</int-http:inbound-gateway>
<int:service-activator input-channel="httpRequestinvoiceAPIEndpointChannel" expression="@sellerClientHelper.getSellerInvoice(headers.id,headers.releaseId)"/>

Apache Tomcat/7.0.59 - Error report

HTTP Status 500 - Request processing failed; nested exception is org.springframework.integration.MessagingException: Could not convert reply: no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]]

type Exception report

message Request processing failed; nested exception is org.springframework.integration.MessagingException: Could not convert reply: no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]]

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.integration.MessagingException: Could not convert reply: no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]]
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:200)
    net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:178)

root cause org.springframework.integration.MessagingException: Could not convert reply: no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]] org.springframework.integration.http.inbound.HttpRequestHandlingMessagingGateway.writeResponse(HttpRequestHandlingMessagingGateway.java:150) org.springframework.integration.http.inbound.HttpRequestHandlingMessagingGateway.handleRequest(HttpRequestHandlingMessagingGateway.java:115) org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827) javax.servlet.http.HttpServlet.service(HttpServlet.java:620) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812) javax.servlet.http.HttpServlet.service(HttpServlet.java:727) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:200) net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:178)

Artem Bilan Artem Bilan · Accepted Answer · 2016-09-01T19:45:08

Sorry, what is the question?

If you would like to get a help you should describe the problem and let us know what you expect.

As for me the message:

no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]]

Is valid, because you have a config like:

 message-converters="byteArrayMessageConverter"

which overrides all default converters and where ByteArrayHttpMessageConverter has this logic:

public boolean supports(Class<?> clazz) {
    return byte[].class == clazz;
}

So, only byte[] can be converted by this converter, where your is ByteArrayOutputStream.

That is explanation how things happen.

Now ask the question and we will try to help!

no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]

HTTP Status 500 - Request processing failed; nested exception is org.springframework.integration.MessagingException: Could not convert reply: no suitable HttpMessageConverter found for type [java.io.ByteArrayOutputStream] and accept types [[application/pdf]]

1 Answers