Gatling: How should I transform a binary response to json and then check it? -


i have page returns pretty big response body binary, when decoded plain text response in json format.

i want transform response can traversed json , checked.

for example:

import org.asynchttpclient.util.base64 import io.gatling.http.response._ import java.nio.charset.standardcharsets.utf_8  // ....   val read = exec(http("get results")   .get("/foo?bar=baz") // response in binary   .transformresponse { case response if response.isreceived =>     new responsewrapper(response) {       override val body = new bytearrayresponsebody(base64.decode(response.body.string), utf_8)     }   }   .check(     jsonpath("$.alpha.beta").exists.saveas("gamma")   ) )

but throws error:

12:54:39.387 [debug] i.g.h.a.asynchandler - request 'get results' failed user 1 java.lang.stringindexoutofboundsexception: string index out of range: 102327         @ java.lang.string.charat(string.java:658)         @ org.asynchttpclient.util.base64.decode(base64.java:125)         @ foo$$anonfun$1$$anon$1.<init>(foo.scala:41)         @ foo$$anonfun$1.applyorelse(foo.scala:40)         @ foo$$anonfun$1.applyorelse(foo.scala:39)         @ io.gatling.http.response.responsebuilder.build(responsebuilder.scala:205)         @ io.gatling.http.ahc.asynchandler.withresponse(asynchandler.scala:126)         @ io.gatling.http.ahc.asynchandler.oncompleted(asynchandler.scala:134)         @ io.gatling.http.ahc.asynchandler.oncompleted(asynchandler.scala:47)         @ org.asynchttpclient.netty.nettyresponsefuture.getcontent(nettyresponsefuture.java:189)         @ org.asynchttpclient.netty.nettyresponsefuture.done(nettyresponsefuture.java:223)         @ org.asynchttpclient.netty.handler.httphandler.finishupdate(httphandler.java:58)         @ org.asynchttpclient.netty.handler.httphandler.handlechunk(httphandler.java:159)         @ org.asynchttpclient.netty.handler.httphandler.handleread(httphandler.java:187)         @ org.asynchttpclient.netty.handler.asynchttpclienthandler.channelread(asynchttpclienthandler.java:76)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:357)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:343)         @ io.netty.channel.abstractchannelhandlercontext.firechannelread(abstractchannelhandlercontext.java:336)         @ io.netty.channel.channelinboundhandleradapter.channelread(channelinboundhandleradapter.java:86)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:357)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:343)         @ io.netty.channel.abstractchannelhandlercontext.firechannelread(abstractchannelhandlercontext.java:336)         @ io.netty.handler.codec.messagetomessagedecoder.channelread(messagetomessagedecoder.java:102)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:357)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:343)         @ io.netty.channel.abstractchannelhandlercontext.firechannelread(abstractchannelhandlercontext.java:336)         @ io.netty.channel.combinedchannelduplexhandler$delegatingchannelhandlercontext.firechannelread(combinedchannelduplexhandler.java:435)         @ io.netty.handler.codec.bytetomessagedecoder.firechannelread(bytetomessagedecoder.java:293)         @ io.netty.handler.codec.bytetomessagedecoder.channelread(bytetomessagedecoder.java:267)         @ io.netty.channel.combinedchannelduplexhandler.channelread(combinedchannelduplexhandler.java:250)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:357)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:343)         @ io.netty.channel.abstractchannelhandlercontext.firechannelread(abstractchannelhandlercontext.java:336)         @ io.netty.channel.defaultchannelpipeline$headcontext.channelread(defaultchannelpipeline.java:1294)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:357)         @ io.netty.channel.abstractchannelhandlercontext.invokechannelread(abstractchannelhandlercontext.java:343)         @ io.netty.channel.defaultchannelpipeline.firechannelread(defaultchannelpipeline.java:911)         @ io.netty.channel.nio.abstractniobytechannel$niobyteunsafe.read(abstractniobytechannel.java:131)         @ io.netty.channel.nio.nioeventloop.processselectedkey(nioeventloop.java:643)         @ io.netty.channel.nio.nioeventloop.processselectedkeysoptimized(nioeventloop.java:566)         @ io.netty.channel.nio.nioeventloop.processselectedkeys(nioeventloop.java:480)         @ io.netty.channel.nio.nioeventloop.run(nioeventloop.java:442)         @ io.netty.util.concurrent.singlethreadeventexecutor$2.run(singlethreadeventexecutor.java:131)         @ io.netty.util.concurrent.defaultthreadfactory$defaultrunnabledecorator.run(defaultthreadfactory.java:144)         @ java.lang.thread.run(thread.java:748) 12:54:39.389 [warn ] i.g.h.a.responseprocessor - request 'get results' failed: j.l.stringindexoutofboundsexception: string index out of range: 102327 12:54:39.399 [trace] i.g.h.a.responseprocessor - >>>>>>>>>>>>>>>>>>>>>>>>>>

is intended purpose transformresponse? doing incorrectly?


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