Read response body in JAX-RS client from a post request

Question

Having some sort of proxy between a mobile app and a web-service  we are puzzled by the response when issuing a post request  We receive response with status 200  OK  But we can not find extract the JSON response body       Client client   ClientBuilder newClient        WebTarget webTarget   client target WEBSERVICE BASE LOCATION    mobileDevices operatorCode KPNSCP        String jsonString       osVersion     4 1     apiLevel   16   devicePlatform     ANDROID          Builder builder   webTarget request        Response response   builder post Entity json jsonString      We are using JAX-RS   Can someone please provide some hints to extract the JSON body  String  from the server response

User · Answer

I just found a solution for jaxrs-ri-2 16 - simply use  String output   response readEntity String class    this delivers the content as expected

User · Answer

Acording with the documentation  the method getEntity in Jax rs 2 0 return a InputStream  If you need to convert to InputStream to String with JSON format  you need to cast the two formats  For example in my case  I implemented the next method       private String processResponse Response response        if  response getEntity      null            try               InputStream salida    InputStream  response getEntity                StringWriter writer   new StringWriter                IOUtils copy salida  writer   UTF-8                return writer toString              catch  IOException ex                LOG log Level SEVERE  null  ex                       return null      why I implemented this method  Because a read in differets blogs that many developers they have the same problem whit the version in jaxrs using the next methods  String output   response readEntity String class    and  String output   response getEntity String class    The first works using jersey-client from  com sun jersey library and the second found using the jersey-client from org glassfish jersey core   This is the error that was being presented to me   org glassfish jersey client internal HttpUrlConnector 2 cannot be cast to java lang String  I use the following maven dependency    lt dependency gt   lt groupId gt org glassfish jersey core lt  groupId gt   lt artifactId gt jersey-client lt  artifactId gt   lt version gt 2 28 lt  version gt      What I do not know is why the readEntity method does not work I hope you can use the solution   Carlos Cepeda

User · Answer

Realizing the revision of the code I found the cause of why the reading method did not work for me  The problem was that one of the dependencies that my project used jersey 1 x  Update the version  adjust the client and it works   I use the following maven dependency    lt dependency gt   lt groupId gt org glassfish jersey core lt  groupId gt   lt artifactId gt jersey-client lt  artifactId gt   lt version gt 2 28 lt  version gt    Regards  Carlos Cepeda

User · Answer

Try this   String output   response getEntity String class     EDIT  Thanks to  Martin Spamer to mention that it will work for Jersey 1 x jars only  For Jersey 2 x use   String output   response readEntity String class

User · Answer

I also had the same issue  trying to run a unit test calling code that uses readEntity  Can t use getEntity in production code because that just returns a ByteInputStream and not the content of the body and there is no way I am adding production code that is hit only in unit tests    My solution was to create a response and then use a Mockito spy to mock out the readEntity method   Response error   Response serverError   build    Response mockResponse   spy error   doReturn   jsonbody    when mockResponse  readEntity String class     Note that you can t use the when mockResponse readEntity String class  option because that throws the same IllegalStateException   Hope this helps

User · Answer

For my use case  none of the previous answers worked because I was writing a server-side unit test which was failing due the following error message as described in the Unable to Mock Glassfish Jersey Client Response Object question   java lang IllegalStateException  Method not supported on an outbound message  at org glassfish jersey message internal OutboundJaxrsResponse readEntity OutboundJaxrsResponse java 145  at       This exception occurred on the following line of code   String actJsonBody   actResponse readEntity String class     The fix was to turn the problem line of code into   String actJsonBody    String  actResponse getEntity

[java] Read response body in JAX-RS client from a post request

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