No Type Error when trying to transform JSON to AVRO - avro

Question

I'm trying to convert a JSON payload to Avro to publish to a Kafka topic. However, when I do the Dataweave transformation I'm getting a "No Type" error. I'm not sure what's causing the error. I originally thought this might be due to the transformation not knowing what the MIME type on the inbound payload. So, I've made sure that it's set to application/json but that didn't make any difference.
Avro Schema
{
"compatibility" : "forward",
"name": "ContentManagerCoupons",
"type": "record",
"namespace": "com.rentpath",
"fields": [
{
"name": "clientID",
"type": "string"
},
{
"name": "outputHistoryId",
"type": "string"
},
{
"name": "categoryCoupons",
"type": {
"type": "array",
"items": {
"name": "categoryCoupons_record",
"type": "record",
"fields": [
{
"name": "applyBy",
"type": [
"string",
"int",
"null"
]
},
{
"name": "applyPeriod",
"type": [
"string",
"null"
]
},
{
"name": "cashValue",
"type": [
"int",
"null"
]
},
{
"name": "couponCategory",
"type": "string"
},
{
"name": "cashOffDesc",
"type": [
"string",
"null"
]
},
{
"name": "endDate",
"type": [
"string",
"null"
]
},
{
"name": "feeType",
"type": [
"string",
"null"
]
},
{
"name": "freeWeeks",
"type": [
"string",
"null"
]
},
{
"name": "generatedText",
"type": "string"
},
{
"name": "leaseby",
"type": [
"string",
"null"
]
},
{
"name": "leaseTerm",
"type": [
"int",
"null"
]
},
{
"name": "offerText",
"type": [
"string",
"null"
]
},
{
"name": "startDate",
"type": "string"
},
{
"name": "unitType",
"type": [
"string",
"null"
]
}
]
}
}
}
]
}
JSON Message
{
"outputHistoryId": "55324456",
"clientID": "112345",
"categoryCoupons": [
{
"unitType": null,
"startDate": "07/21/2020",
"offerText": "This would be the special offer message.",
"leaseTerm": null,
"leaseby": null,
"generatedText": "This would be the special offer message..",
"freeWeeks": null,
"feeType": null,
"endDate": "10/01/2020",
"couponCategory": "Special Offer",
"cashValue": null,
"cashOffDesc": null,
"applyPeriod": null,
"applyBy": null
}
]
}
Datawave
%dw 2.2
output application/avro schemaUrl="http://schema-registry.domain.com:8081/subjects/Coupon-value/versions/1"
---
payload
Error Message
"org.apache.avro.SchemaParseException - No type: {"subject":"ContentManager.Coupon-value","version":1,"id":342,"schema":"{"type":"record","name":"ContentManagerCoupons","namespace":"com.rentpath","fields":[{"name":"clientID","type":"string"},{"name":"outputHistoryId","type":"string"},{"name":"categoryCoupons","type":{"type":"array","items":{"type":"record","name":"categoryCoupons_record","fields":[{"name":"applyBy","type":["string","int","null"]},{"name":"applyPeriod","type":["string","null"]},{"name":"cashValue","type":["int","null"]},{"name":"couponCategory","type":"string"},{"name":"cashOffDesc","type":["string","null"]},{"name":"endDate","type":["string","null"]},{"name":"feeType","type":["string","null"]},{"name":"freeWeeks","type":["string","null"]},{"name":"generatedText","type":"string"},{"name":"leaseby","type":["string","null"]},{"name":"leaseTerm","type":["int","null"]},{"name":"offerText","type":["string","null"]},{"name":"startDate","type":"string"},{"name":"unitType","type":["string","null"]}]}}}],"compatibility":"forward"}"}
org.apache.avro.SchemaParseException: No type: {"subject":"ContentManager.Coupon-value","version":1,"id":342,"schema":"{"type":"record","name":"ContentManagerCoupons","namespace":"com.rentpath","fields":[{"name":"clientID","type":"string"},{"name":"outputHistoryId","type":"string"},{"name":"categoryCoupons","type":{"type":"array","items":{"type":"record","name":"categoryCoupons_record","fields":[{"name":"applyBy","type":["string","int","null"]},{"name":"applyPeriod","type":["string","null"]},{"name":"cashValue","type":["int","null"]},{"name":"couponCategory","type":"string"},{"name":"cashOffDesc","type":["string","null"]},{"name":"endDate","type":["string","null"]},{"name":"feeType","type":["string","null"]},{"name":"freeWeeks","type":["string","null"]},{"name":"generatedText","type":"string"},{"name":"leaseby","type":["string","null"]},{"name":"leaseTerm","type":["int","null"]},{"name":"offerText","type":["string","null"]},{"name":"startDate","type":"string"},{"name":"unitType","type":["string","null"]}]}}}],"compatibility":"forward"}"}
at org.apache.avro.Schema.getRequiredText(Schema.java:1753)
at org.apache.avro.Schema.parse(Schema.java:1604)
at org.apache.avro.Schema$Parser.parse(Schema.java:1394)
at org.apache.avro.Schema$Parser.parse(Schema.java:1365)
at org.mule.weave.v2.module.avro.AvroWriter.doWriteValue(AvroWriter.scala:195)
at org.mule.weave.v2.module.writer.Writer.writeValue(Writer.scala:41)
at org.mule.weave.v2.module.writer.Writer.writeValue$(Writer.scala:39)
at org.mule.weave.v2.module.avro.AvroWriter.writeValue(AvroWriter.scala:44)
at org.mule.weave.v2.module.writer.DeferredWriter.doWriteValue(DeferredWriter.scala:73)
at org.mule.weave.v2.module.writer.Writer.writeValue(Writer.scala:41)
at org.mule.weave.v2.module.writer.Writer.writeValue$(Writer.scala:39)
at org.mule.weave.v2.module.writer.DeferredWriter.writeValue(DeferredWriter.scala:16)
at org.mule.weave.v2.module.writer.WriterHelper$.writeValue(Writer.scala:120)
at org.mule.weave.v2.module.writer.WriterHelper$.writeAndGetResult(Writer.scala:98)
at org.mule.weave.v2.interpreted.InterpretedMappingExecutableWeave.write(InterpreterMappingCompilerPhase.scala:236)
at org.mule.weave.v2.el.WeaveExpressionLanguageSession.evaluateWithTimeout(WeaveExpressionLanguageSession.scala:243)
at org.mule.weave.v2.el.WeaveExpressionLanguageSession.evaluate(WeaveExpressionLanguageSession.scala:108)
at org.mule.runtime.core.internal.el.dataweave.DataWeaveExpressionLanguageAdaptor$1.evaluate(DataWeaveExpressionLanguageAdaptor.java:308)
at org.mule.runtime.core.internal.el.DefaultExpressionManagerSession.evaluate(DefaultExpressionManagerSession.java:105)
at com.mulesoft.mule.runtime.core.internal.processor.SetPayloadTransformationTarget.process(SetPayloadTransformationTarget.java:32)
at com.mulesoft.mule.runtime.core.internal.processor.TransformMessageProcessor.lambda$0(TransformMessageProcessor.java:92)
at java.util.Optional.ifPresent(Optional.java:159)
at com.mulesoft.mule.runtime.core.internal.processor.TransformMessageProcessor.process(TransformMessageProcessor.java:92)
at org.mule.runtime.core.api.util.func.CheckedFunction.apply(CheckedFunction.java:25)
at org.mule.runtime.core.api.rx.Exceptions.lambda$checkedFunction$2(Exceptions.java:84)
at org.mule.runtime.core.internal.util.rx.Operators.lambda$nullSafeMap$0(Operators.java:47)
at reactor.core.publisher.FluxHandleFuseable$HandleFuseableSubscriber.onNext(FluxHandleFuseable.java:165)
at org.mule.runtime.core.privileged.processor.chain.AbstractMessageProcessorChain$2.onNext(AbstractMessageProcessorChain.java:425)
at org.mule.runtime.core.privileged.processor.chain.AbstractMessageProcessorChain$2.onNext(AbstractMessageProcessorChain.java:420)
at reactor.core.publisher.FluxHide$SuppressFuseableSubscriber.onNext(FluxHide.java:127)
at reactor.core.publisher.FluxPeekFuseable$PeekFuseableSubscriber.onNext(FluxPeekFuseable.java:204)
at reactor.core.publisher.FluxOnAssembly$OnAssemblySubscriber.onNext(FluxOnAssembly.java:345)
at reactor.core.publisher.FluxSubscribeOnValue$ScheduledScalar.run(FluxSubscribeOnValue.java:178)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:50)
at reactor.core.scheduler.SchedulerTask.call(SchedulerTask.java:27)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.mule.service.scheduler.internal.AbstractRunnableFutureDecorator.doRun(AbstractRunnableFutureDecorator.java:111)
at org.mule.service.scheduler.internal.RunnableFutureDecorator.run(RunnableFutureDecorator.java:54)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748), while writing Avro at payload.

Answer 1

It seems to work for me. Maybe there is a problem trying to access the schema. Because I don't have access to that URL I replaced it with a local file:
output application/avro schemaUrl="classpath://schema.json"

Answer 2

Apparently the answer is pretty simple. I just needed to add schema to the end of my URL. This removes the extraneous items like version and id that come down without it.
New Dataweave
%dw 2.2
output application/avro schemaUrl="http://schema-registry.domain.com:8081/subjects/Coupon-value/versions/1/schema"
---
payload