Error getting GZIP output stream when using WSO2 ESB - wso2

Question

I am trying to create an API in WSO2 ESB 4.9.0 that should return an image of JPEG type.
But I am getting this error: Caused by: org.apache.axis2.AxisFault: Error getting GZIP output stream.
So, is it possible to turn off GZIP compression in WSO2 ESB for image/jpeg message types?
TID: [-1234] [] [2016-03-23 08:17:09,833] ERROR
{org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator}
- Error getting GZIP output stream {org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator}
org.apache.axis2.AxisFault: Invalid null character in text to output
at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430) at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:146)
at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.writeTo(GzipMessageFormatterDecorator.java:66)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.submitResponse(PassThroughHttpSender.java:552)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:267)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442) at
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:212)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:444)
at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:102)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:81)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:48)
at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:149)
at org.apache.synapse.rest.Resource.process(Resource.java:297) at
org.apache.synapse.rest.API.process(API.java:335) at
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:97)
at
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:52)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:266)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:529)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:172)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at
org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:247)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745) Caused by:
com.ctc.wstx.exc.WstxIOException: Invalid null character in text to
output at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:462)
at
org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeCharacters(MTOMXMLStreamWriter.java:289)
at
org.apache.axiom.om.impl.llom.OMTextImpl.writeOutput(OMTextImpl.java:250)
at
org.apache.axiom.om.impl.llom.OMTextImpl.internalSerialize(OMTextImpl.java:415)
at
org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
at
org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:143)
... 23 more Caused by: java.io.IOException: Invalid null character in
text to output at
com.ctc.wstx.api.InvalidCharHandler$FailingHandler.convertInvalidChar(InvalidCharHandler.java:51)
at com.ctc.wstx.sw.XmlWriter.handleInvalidChar(XmlWriter.java:623)
at
com.ctc.wstx.sw.BufferingXmlWriter.writeCharacters(BufferingXmlWriter.java:554)
at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:460)
... 30 more TID: [-1234] [] [2016-03-23 08:17:09,838] ERROR
{org.apache.synapse.transport.passthru.PassThroughHttpSSLSender} -
Failed to submit the response
{org.apache.synapse.transport.passthru.PassThroughHttpSSLSender}
org.apache.axis2.AxisFault: Error getting GZIP output stream at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.handleException(GzipMessageFormatterDecorator.java:95)
at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.writeTo(GzipMessageFormatterDecorator.java:76)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.submitResponse(PassThroughHttpSender.java:552)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:267)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442) at
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:212)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:444)
at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:102)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:81)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:48)
at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:149)
at org.apache.synapse.rest.Resource.process(Resource.java:297) at
org.apache.synapse.rest.API.process(API.java:335) at
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:97)
at
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:52)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:266)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:529)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:172)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at
org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:247)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745) Caused by:
org.apache.axis2.AxisFault: Invalid null character in text to output
at org.apache.axis2.AxisFault.makeFault(AxisFault.java:430) at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:146)
at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.writeTo(GzipMessageFormatterDecorator.java:66)
... 22 more Caused by: com.ctc.wstx.exc.WstxIOException: Invalid null
character in text to output at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:462)
at
org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeCharacters(MTOMXMLStreamWriter.java:289)
at
org.apache.axiom.om.impl.llom.OMTextImpl.writeOutput(OMTextImpl.java:250)
at
org.apache.axiom.om.impl.llom.OMTextImpl.internalSerialize(OMTextImpl.java:415)
at
org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
at
org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:143)
... 23 more Caused by: java.io.IOException: Invalid null character in
text to output at
com.ctc.wstx.api.InvalidCharHandler$FailingHandler.convertInvalidChar(InvalidCharHandler.java:51)
at com.ctc.wstx.sw.XmlWriter.handleInvalidChar(XmlWriter.java:623)
at
com.ctc.wstx.sw.BufferingXmlWriter.writeCharacters(BufferingXmlWriter.java:554)
at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:460)
... 30 more TID: [-1234] [] [2016-03-23 08:17:09,841] ERROR
{org.apache.synapse.core.axis2.Axis2Sender} -
Content-Encoding:gzip,Content-Type:image/jpeg,Vary:Accept-Encoding,
Unexpected error sending message back
{org.apache.synapse.core.axis2.Axis2Sender}
org.apache.axis2.AxisFault: Failed to submit the response at
org.apache.synapse.transport.passthru.PassThroughHttpSender.handleException(PassThroughHttpSender.java:610)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:269)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:442) at
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:212)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:444)
at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:102)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:81)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:48)
at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:149)
at org.apache.synapse.rest.Resource.process(Resource.java:297) at
org.apache.synapse.rest.API.process(API.java:335) at
org.apache.synapse.rest.RESTRequestHandler.dispatchToAPI(RESTRequestHandler.java:97)
at
org.apache.synapse.rest.RESTRequestHandler.process(RESTRequestHandler.java:52)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:266)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:529)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:172)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)
at
org.apache.synapse.transport.passthru.ClientWorker.run(ClientWorker.java:247)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745) Caused by:
org.apache.axis2.AxisFault: Error getting GZIP output stream at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.handleException(GzipMessageFormatterDecorator.java:95)
at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.writeTo(GzipMessageFormatterDecorator.java:76)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.submitResponse(PassThroughHttpSender.java:552)
at
org.apache.synapse.transport.passthru.PassThroughHttpSender.invoke(PassThroughHttpSender.java:267)
... 20 more Caused by: org.apache.axis2.AxisFault: Invalid null
character in text to output at
org.apache.axis2.AxisFault.makeFault(AxisFault.java:430) at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:146)
at
org.apache.synapse.transport.nhttp.util.GzipMessageFormatterDecorator.writeTo(GzipMessageFormatterDecorator.java:66)
... 22 more Caused by: com.ctc.wstx.exc.WstxIOException: Invalid null
character in text to output at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:462)
at
org.apache.axiom.om.impl.MTOMXMLStreamWriter.writeCharacters(MTOMXMLStreamWriter.java:289)
at
org.apache.axiom.om.impl.llom.OMTextImpl.writeOutput(OMTextImpl.java:250)
at
org.apache.axiom.om.impl.llom.OMTextImpl.internalSerialize(OMTextImpl.java:415)
at
org.apache.axiom.om.impl.util.OMSerializerUtil.serializeChildren(OMSerializerUtil.java:562)
at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.java:875)
at
org.apache.axiom.om.impl.llom.OMSerializableImpl.serializeAndConsume(OMSerializableImpl.java:193)
at
org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:143)
... 23 more Caused by: java.io.IOException: Invalid null character in
text to output at
com.ctc.wstx.api.InvalidCharHandler$FailingHandler.convertInvalidChar(InvalidCharHandler.java:51)
at com.ctc.wstx.sw.XmlWriter.handleInvalidChar(XmlWriter.java:623)
at
com.ctc.wstx.sw.BufferingXmlWriter.writeCharacters(BufferingXmlWriter.java:554)
at
com.ctc.wstx.sw.BaseStreamWriter.writeCharacters(BaseStreamWriter.java:460)
... 30 more TID: [-1234] [] [2016-03-23 08:17:09,844] ERROR
{org.apache.synapse.mediators.builtin.LogMediator} - Could not build
full log message: Can not serialize OM Element Envelope
{org.apache.synapse.mediators.builtin.LogMediator} TID: [-1234] []
[2016-03-23 08:17:09,845] ERROR {API_LOGGER.Photos} - Could not build
full log message: Can not serialize OM Element Envelope
{API_LOGGER.Photos} TID: [-1234] [] [2016-03-23 08:17:09,850] INFO
{org.apache.synapse.mediators.builtin.LogMediator} - To:
http://www.w3.org/2005/08/addressing/anonymous, WSAction: ,
SOAPAction: , MessageID:
urn:uuid:e4e1882c-6a04-4c77-b802-0aaf7d5f73cb, Direction: response,
MESSAGE = Executing default 'fault' sequence, ERROR_CODE = 0,
ERROR_MESSAGE =
Content-Encoding:gzip,Content-Type:image/jpeg,Vary:Accept-Encoding,
Unexpected error sending message back, Envelope:
{org.apache.synapse.mediators.builtin.LogMediator}

Answer 1

Judging by the error log* the ESB is parsing your image as an application/xml. So perhaps you have made a configuration error in the /repository/conf/axis2/axis2.xml file?
The builder and formatter should be defined as:
<messageBuilder contentType="image/jpeg" class="org.wso2.carbon.relay.BinaryRelayBuilder" />
<messageFormatter contentType="image/jpeg" class="org.wso2.carbon.relay.ExpandingMessageFormatter" />
See also: http://sachirajapakse.blogspot.nl/2015/10/send-images-for-rest-api-in-wso2-esb.html
*org.apache.axis2.transport.http.ApplicationXMLFormatter.writeTo(ApplicationXMLFormatter.java:143) ... 23 more Caused by: java.io.IOException: Invalid null character in text to output at (..)