How to use camel type converter to convert exchange data into file object in apahce camel? [duplicate] - apache

Question

I am new to Camel and I am facing an issue while sending files to webservice via camel http.
I have a rest web service which consumes Multipart form data type content and accepts input as part of form data.
When I send file and form parameter via camel it gives me the following error at camel console:
Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.component.http.HttpOperationFailedException: HTTP operation failed invoking http://localhost:8080/JAX_RS_Application/resource/restwb/upload with statusCode: 415
at org.apache.camel.component.http.HttpProducer.populateHttpOperationFailedException(HttpProducer.java:230)
at org.apache.camel.component.http.HttpProducer.process(HttpProducer.java:156)
at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:129)
at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77)
at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:448)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:118)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:80)
at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:191)
at org.apache.camel.component.file.GenericFileConsumer.processExchange(GenericFileConsumer.java:435)
at org.apache.camel.component.file.GenericFileConsumer.processBatch(GenericFileConsumer.java:211)
at org.apache.camel.component.file.GenericFileConsumer.poll(GenericFileConsumer.java:175)
at org.apache.camel.impl.ScheduledPollConsumer.doRun(ScheduledPollConsumer.java:174)
at org.apache.camel.impl.ScheduledPollConsumer.run(ScheduledPollConsumer.java:101)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
The error i get on the server side console is as follows:
SEVERE: MessageBodyReader not found for media type=application/octet-stream, typ
e=class org.glassfish.jersey.media.multipart.FormDataMultiPart, genericType=clas
s org.glassfish.jersey.media.multipart.FormDataMultiPart.
The code snippet of the Rest web-service created via jersey is as follows:
import java.io.IOException;
import java.io.InputStream;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import org.apache.commons.io.IOUtils;
import org.glassfish.jersey.media.multipart.FormDataContentDisposition;
import org.glassfish.jersey.media.multipart.FormDataParam;
#Path("/restwb")
public class FileResource {
#POST
#Path("/upload")
#Consumes(MediaType.MULTIPART_FORM_DATA)
public String uploadFile(#FormDataParam("username") String username,#FormDataParam("password") String password,#FormDataParam("upload") InputStream is) {
String output ="Hi "+username+" your password is "+password;
output=output+IOUtils.LINE_SEPARATOR +IOUtils.LINE_SEPARATOR;
output=output+"Output :"+IOUtils.LINE_SEPARATOR+"------------------------------------------------------------------------------"+IOUtils.LINE_SEPARATOR;
try {
output=output+IOUtils.toString(is)+IOUtils.LINE_SEPARATOR+IOUtils.LINE_SEPARATOR;
output=output+"==================================================================================================="+IOUtils.LINE_SEPARATOR+IOUtils.LINE_SEPARATOR;
System.out.println("Output :"+output);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return output;
}
}
And my Camel config is as follows:
import org.apache.camel.*;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.spi.Synchronization;
import org.apache.camel.spi.UnitOfWork;
import org.apache.http.HttpEntity;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.james.mime4j.message.Multipart;
import org.apache.log4j.Logger;
import java.io.File;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
/**
* Created by Manish.Pillai on 7/16/2015.
*/
public class LoggingMain {
private static final Logger logger =Logger.getLogger(LoggingMain.class);
public static void main(String[] args) throws Exception{
CamelContext camelContext =new DefaultCamelContext();
try {
camelContext.addRoutes(new RouteBuilder() {
#Override
public void configure() throws Exception {
from("file:C:\\temp?delay=5000&move=processed&moveFailed=error&antExclude=**/processed/**,**/error/**")
.process(new Processor() {
public void process(Exchange exchange) throws Exception {
exchange.getContext().getTypeConverterRegistry().addTypeConverter(HttpEntity.class,InputStream.class,new InputStreamToHttpEntityConvertor());
exchange.getOut().setBody(exchange.getIn().getBody(),HttpEntity.class);
}
})
.to("http://localhost:8080/JAX_RS_Application/resource/restwb/upload");
}
});
camelContext.getRestConfiguration();
camelContext.start();
Thread.sleep(5000);
camelContext.stop();
} catch (Exception e) {
logger.error(e.getMessage());
}
}
static class InputStreamToHttpEntityConvertor implements TypeConverter {
public boolean allowNull() {
return false;
}
public <T> T convertTo(Class<T> type, Object value) throws TypeConversionException {
Exchange exchange=(Exchange)value;
StringBody username = new StringBody("username", ContentType.MULTIPART_FORM_DATA);
StringBody password = new StringBody("password", ContentType.MULTIPART_FORM_DATA);
MultipartEntityBuilder multipartEntityBuilder=MultipartEntityBuilder.create();
multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multipartEntityBuilder.addPart("upload", new FileBody(exchange.getIn().getBody(File.class), ContentType.MULTIPART_FORM_DATA, (String) exchange.getIn().getHeader(Exchange.FILE_NAME)));
multipartEntityBuilder.addPart("username",username);
multipartEntityBuilder.addPart("password",password);
return (T)multipartEntityBuilder.build();
}
public <T> T convertTo(Class<T> aClass, Exchange exchange, Object o) throws TypeConversionException {
return convertTo(aClass,o);
}
public <T> T mandatoryConvertTo(Class<T> type, Object value) throws TypeConversionException, NoTypeConversionAvailableException {
return convertTo(type,value);
}
public <T> T mandatoryConvertTo(Class<T> type, Exchange exchange, Object value) throws TypeConversionException, NoTypeConversionAvailableException {
return convertTo(type,value);
}
public <T> T tryConvertTo(Class<T> type, Object value) {
return convertTo(type,value);
}
public <T> T tryConvertTo(Class<T> type, Exchange exchange, Object value) {
return convertTo(type,value);
}
}
}
Any leads would be helpful.

Answer 1

Well, there are several things that can be improved in your code.
First, since you are using a MultipartEntityBuilder, that means you're using Apache's HttpClient version 4.3+, so for best compatibility you should use Camel's HTTP4 component.
Third, in an example as small as this, you don't really need to use the converter, you can do something like this:
public class LoggingMain {
private static final Logger logger = Logger.getLogger(LoggingMain.class);
public static void main(String[] args) throws Exception {
CamelContext camelContext = new DefaultCamelContext();
try {
camelContext.addRoutes(new RouteBuilder() {
#Override
public void configure() throws Exception {
from("file:C:\\temp?delay=5000&move=processed&moveFailed=error&antExclude=**/processed/**,**/error/**")
.process(new Processor() {
public void process(Exchange exchange) throws Exception {
StringBody username = new StringBody("username", ContentType.MULTIPART_FORM_DATA);
StringBody password = new StringBody("password", ContentType.MULTIPART_FORM_DATA);
MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multipartEntityBuilder.addPart("username", username);
multipartEntityBuilder.addPart("password", password);
String filename = (String) exchange.getIn().getHeader(Exchange.FILE_NAME);
File file = exchange.getIn().getBody(File.class);
multipartEntityBuilder.addPart("upload", new FileBody(file, ContentType.MULTIPART_FORM_DATA, filename));
exchange.getIn().setBody(multipartEntityBuilder.build());
}
})
.to("http4://localhost:8080/JAX_RS_Application/resource/restwb/upload");
}
});
camelContext.getRestConfiguration();
camelContext.start();
Thread.sleep(5000);
camelContext.stop();
} catch (Exception e) {
logger.error(e.getMessage());
}
}
}
I hope this helps!