How to map Template Variable URI to Spring Controller.

[samsam007]

Hi I am using Template Variable URI with Spring MVC 3.1 in JBOSS 7, I don't see my mapping from a Tempalte Variable URI mapped to a controller.
Here is its jsp code:

<spring:url value="/category/image/${category.categoryId}" var="url" htmlEscape="true" />
                                                                            <td><img alt="" src="${url}" /></td>

Method in Controller:

@RequestMapping(value="/category/image/{processDefinitionKey}", method = RequestMethod.GET)
public ResponseEntity<byte[]> showImage(
        @PathVariable final String  processDefinitionKey) 
{
        String categoryId = processDefinitionKey;
        logger.debug("showImage() - categoryId: "+categoryId);
        ....
}

Webmvc-config.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schem...ng-mvc-3.0.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

	<!-- Enables controllers mapped with @RequestMapping annotations, formatting annotations @NumberFormat @DateTimeFormat, and JSR 303 style validation -->
	<mvc:annotation-driven/>

	<mvc:resources mapping="/resources/**" location="/, classpath:/META-INF/web-resources/" />
	<mvc:default-servlet-handler />
    

	<!-- Map paths directly to view names without controller processing. Use the view-name attribute if necessary: by convention the view name equals the path without the leading slash -->
	<mvc:view-controller path="/" view-name="intro" />
	<mvc:view-controller path="/login" />
	<mvc:view-controller path="/logoutSuccess" />

	<!-- Resolves logical view names returned by Controllers to Tiles; a view name to resolve is treated as the name of a tiles definition -->
	<bean id="tilesViewResolver" class="org.springframework.js.ajax.AjaxUrlBasedViewResolver">
		<property name="viewClass" value="org.springframework.webflow.mvc.view.FlowAjaxTilesView"/>
	</bean>
        
                  <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
                        <property name="basename" value="messages"/>
                    </bean>

                    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">      
                    </bean>
                    
	<!-- Configures the Tiles layout system -->
	<bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer">
		<property name="definitions">
			<list>
				<value>/WEB-INF/**/views.xml</value>
			</list>
		</property>
	</bean>

Any suggestion would be very appreciated.
Thanks
sam

[Marten Deinum]

Crank up your loglevel to debug (or trace) and see what is happening to your mappings and incoming requests.

[samsam007]

Hi Marten,
Thank you for your suggestion.
I am using Jboss 7, the server.log file shown relevent debug info here:

01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'Spring MVC Dispatcher Servlet' processing GET request for [/CategoryClient6-web/category/image/4302]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/resources/images/springone2gx.jpeg] are {}
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/category/image/4958] are [/**]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Trying relative path [images/th.bg.gif] against base location: ServletContext resource [/]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Did not find handler method for [/category/image/5499]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/category/image/4958] are {}
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/4302
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/resources/images/springone2gx.jpeg] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.ResourceH ttpRequestHandler@55ac539f] and 1 interceptor
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/category/image/4958] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.DefaultSe rvletHttpRequestHandler@1550a3c] and 1 interceptor
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/category/image/5499] are [/**]
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Found matching resource: ServletContext resource [/images/th.bg.gif]
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/category/image/5499] are {}
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/category/image/4958] is: -1
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/resources/images/springone2gx.jpeg] is: -1
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'Spring MVC Dispatcher Servlet': assuming HandlerAdapter completed request handling
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-6) DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'Spring MVC Dispatcher Servlet' processing GET request for [/CategoryClient6-web/category/image/5955]
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-6) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/5955
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/category/image/5499] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.DefaultSe rvletHttpRequestHandler@1550a3c] and 1 interceptor
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Determined media type 'image/gif' for ServletContext resource [/images/th.bg.gif]
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/category/image/5499] is: -1
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'Spring MVC Dispatcher Servlet': assuming HandlerAdapter completed request handling

The mapping /category/image/5499 does not map to the controller, here is the controller:

@Controller
@RequestMapping(value="/category/image/{processDefinitionKey}", method = RequestMethod.GET)
public class CategoryImageController {

private static final Logger logger = Logger.getLogger(CategoryImageController.class);

private CategoryImageService categoryImageService;

@Autowired
public CategoryImageController(CategoryImageService categoryImageService) {
this.categoryImageService = categoryImageService;
}


public ResponseEntity<byte[]> showImage(@PathVariable final String processDefinitionKey)
{
String categoryId = processDefinitionKey;
logger.debug("showImage() - categoryId: "+categoryId);
List<CategoryImages> ciList = (List<CategoryImages>) categoryImageService.findImagesByCategoryId(Intege r.parseInt(categoryId), 0, categoryImageService.count()) ;
if (ciList.isEmpty()) {
logger.debug("cList is Empty.............");
return null;
}
logger.debug(" .......... before ciList.get(0)..............");
CategoryImages ci = ciList.get(0);
int imageLength = ci.getImageData().length;
try {
logger.debug(" ..........in Try Block......... ");
InputStream image = new ByteArrayInputStream(ci.getImageData());
byte[] imageBytes = IOUtils.toByteArray(image);
logger.debug(" ..........imageBytes length: "+imageBytes.length);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
headers.setContentLength(imageBytes.length);
logger.debug(" ..........headers: "+headers.toString());

return new ResponseEntity<byte[]>(imageBytes, headers, HttpStatus.OK);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

I think I have a special configration missing in my xml file, but I don't know what is missing there.
Can you please suggest what should I create in the xml file for mapping url template variable path to a controller?

Thanks
Sam

[Marten Deinum]

Your method should be annotated with @RequestMapping to mark it as a request handling method, currently there is nothing on there. which doesn't register your controller.

Check the startup logs and you should see the mappings pass by.

[samsam007]

Hi here is the corresponding message in log file:

01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'Spring MVC Dispatcher Servlet' processing GET request for [/CategoryClient6-web/category/image/4302]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/resources/images/springone2gx.jpeg] are {}
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/category/image/4958] are [/**]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Trying relative path [images/th.bg.gif] against base location: ServletContext resource [/]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Did not find handler method for [/category/image/5499]
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/category/image/4958] are {}
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/4302
01:35:25,836 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/resources/images/springone2gx.jpeg] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.ResourceH ttpRequestHandler@55ac539f] and 1 interceptor
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/category/image/4958] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.DefaultSe rvletHttpRequestHandler@1550a3c] and 1 interceptor
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/category/image/5499] are [/**]
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Found matching resource: ServletContext resource [/images/th.bg.gif]
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/category/image/5499] are {}
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/category/image/4958] is: -1
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/resources/images/springone2gx.jpeg] is: -1
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'Spring MVC Dispatcher Servlet': assuming HandlerAdapter completed request handling
01:35:25,837 INFO [stdout] (http--192.168.1.20-8080-6) DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'Spring MVC Dispatcher Servlet' processing GET request for [/CategoryClient6-web/category/image/5955]
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-6) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/5955
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/category/image/5499] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.DefaultSe rvletHttpRequestHandler@1550a3c] and 1 interceptor
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Determined media type 'image/gif' for ServletContext resource [/images/th.bg.gif]
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/category/image/5499] is: -1
01:35:25,838 INFO [stdout] (http--192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.DispatcherServlet - Null ModelAndView returned to DispatcherServlet with name 'Spring MVC Dispatcher Servlet': assuming HandlerAdapter completed request handling

Thanks
Sam

[Marten Deinum]

Hi here is the corresponding message in log file:

No it isn't... You want the STARTUP log... Not the request processing log.

[samsam007]

Hi, here is the start up log when I deployed its .ear file to jboss server:

02:30:38,832 INFO [stdout] (MSC service thread 1-6) INFO : org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Mapped "{[/category/image/{processDefinitionKey}/category/image/{processDefinitionKey}],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<byte[]> ix.houseware.category.web.controller.CategoryImage Controller.showImage(java.lang.String)

Source for CategoryImageController.java file:

@Controller
@RequestMapping(value="/category/image/{processDefinitionKey}", method = RequestMethod.GET)
public class CategoryImageController {

private static final Logger logger = Logger.getLogger(CategoryImageController.class);

private CategoryImageService categoryImageService;

@Autowired
public CategoryImageController(CategoryImageService categoryImageService) {
this.categoryImageService = categoryImageService;
}


@RequestMapping(value="/category/image/{processDefinitionKey}", method = RequestMethod.GET)
public ResponseEntity<byte[]> showImage(@PathVariable final String processDefinitionKey)
{
String categoryId = processDefinitionKey;
logger.debug("showImage() - categoryId: "+categoryId);
List<CategoryImages> ciList = (List<CategoryImages>) categoryImageService.findImagesByCategoryId(Intege r.parseInt(categoryId), 0, categoryImageService.count()) ;
if (ciList.isEmpty()) {
logger.debug("cList is Empty.............");
return null;
}
logger.debug(" .......... before ciList.get(0)..............");
CategoryImages ci = ciList.get(0);
int imageLength = ci.getImageData().length;
try {
logger.debug(" ..........in Try Block......... ");
InputStream image = new ByteArrayInputStream(ci.getImageData());
byte[] imageBytes = IOUtils.toByteArray(image);
logger.debug(" ..........imageBytes length: "+imageBytes.length);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
headers.setContentLength(imageBytes.length);
logger.debug(" ..........headers: "+headers.toString());

return new ResponseEntity<byte[]>(imageBytes, headers, HttpStatus.OK);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

Thanks a lot
Sam

[samsam007]

Here is the request log:

02:34:17,228 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.DispatcherServlet - DispatcherServlet with name 'Spring MVC Dispatcher Servlet' processing GET request for [/CategoryClient6-web/category/image/5499]
02:34:17,228 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-2) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /resources/images/springone2gx.jpeg
02:34:17,228 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/5499
02:34:17,228 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-5) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Looking up handler method for path /category/image/4958
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/resources/images/diplomat.jpg] are [/resources/**]
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - URI Template variables for request [/resources/images/diplomat.jpg] are {}
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Mapping [/resources/images/diplomat.jpg] to HandlerExecutionChain with handler [org.springframework.web.servlet.resource.ResourceH ttpRequestHandler@41225841] and 1 interceptor
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.DispatcherServlet - Last-Modified value for [/CategoryClient6-web/resources/images/diplomat.jpg] is: -1
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Trying relative path [images/diplomat.jpg] against base location: ServletContext resource [/]
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-6) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Found matching resource: ServletContext resource [/images/th.bg.gif]
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Found matching resource: ServletContext resource [/images/diplomat.jpg]
02:34:17,229 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-1) DEBUG: org.springframework.web.servlet.resource.ResourceH ttpRequestHandler - Determined media type 'image/jpeg' for ServletContext resource [/images/diplomat.jpg]
02:34:17,230 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Did not find handler method for [/category/image/5499]
02:34:17,230 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-4) DEBUG: org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Did not find handler method for [/category/image/4302]
02:34:17,230 INFO [stdout] (http-portal.ixsystems.com.au-192.168.1.20-8080-3) DEBUG: org.springframework.web.servlet.handler.SimpleUrlH andlerMapping - Matching patterns for request [/category/image/5499] are [/**]

[Marten Deinum]

Your mapping of the controller is wrong.... Mappings on the class and method level are merged together... Your method maps to /category/image/{processDefinitionKey}/category/image/{processDefinitionKey} (combined from class and method level). Remove the method level @RequestMapping annotation.

This is also clearly stated in the startup log.

02:30:38,832 INFO [stdout] (MSC service thread 1-6) INFO : org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Mapped "{[/category/image/{processDefinitionKey}/category/image/{processDefinitionKey}],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<byte[]> ix.houseware.category.web.controller.CategoryImage Controller.showImage(java.lang.String)

[samsam007]

Thank you for your suggestion.
I have changed it to the following implementation for CategoryImageController.java class:

@Controller
@RequestMapping("/category/image")
public class CategoryImageController {

private static final Logger logger = Logger.getLogger(CategoryImageController.class);

private CategoryImageService categoryImageService;

@Autowired
public CategoryImageController(CategoryImageService categoryImageService) {
this.categoryImageService = categoryImageService;
}


// @RequestMapping(value = "/reportTemplate/{id}/content", method = RequestMethod.GET)
@RequestMapping(value="{processDefinitionKey}", method = RequestMethod.GET)
public ResponseEntity<byte[]> showImage(@PathVariable String processDefinitionKey, Model model) throws Exception
{
String categoryId = processDefinitionKey;
logger.debug("showImage() - categoryId: "+categoryId);
List<CategoryImages> ciList = (List<CategoryImages>) categoryImageService.findImagesByCategoryId(Intege r.parseInt(categoryId), 0, categoryImageService.count()) ;
if (ciList.isEmpty()) {
logger.debug("cList is Empty.............");
return null;
}
logger.debug(" .......... before ciList.get(0)..............");
CategoryImages ci = ciList.get(0);
int imageLength = ci.getImageData().length;
try {
logger.debug(" ..........in Try Block......... ");
InputStream image = new ByteArrayInputStream(ci.getImageData());
byte[] imageBytes = IOUtils.toByteArray(image);
logger.debug(" ..........imageBytes length: "+imageBytes.length);

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.IMAGE_JPEG);
headers.setContentLength(imageBytes.length);
logger.debug(" ..........headers: "+headers.toString());

return new ResponseEntity<byte[]>(imageBytes, headers, HttpStatus.OK);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

Spring still failed to map it to the controller. Here with its log message:

09:50:46,997 INFO [stdout] (MSC service thread 1-5) INFO : org.springframework.web.servlet.mvc.method.annotat ion.RequestMappingHandlerMapping - Mapped "{[/category/image/{processDefinitionKey}],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public org.springframework.http.ResponseEntity<byte[]> ix.houseware.category.web.controller.CategoryImage Controller.showImage(java.lang.String,org.springfr amework.ui.Model) throws java.lang.Exception

Thanks
Sam