Chia-Ping Tsai created KAFKA-20433:
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Summary: Fix NPE caused by nonexistent field in HeaderFrom
Key: KAFKA-20433
URL: https://issues.apache.org/jira/browse/KAFKA-20433
Project: Kafka
Issue Type: Bug
Reporter: Chia-Ping Tsai
Assignee: Chia-Ping Tsai
{code:java}
[2026-04-10 15:41:51,450] ERROR [npe-test-sink|task-0] Error encountered in
task npe-test-sink-0. Executing stage 'TRANSFORMATION' with class
'org.apache.kafka.connect.transforms.HeaderFrom$Value', where consumed record
is {topic='test-topic-npe', partition=5, offset=0, timestamp=1775835710419,
timestampType=CreateTime}.
(org.apache.kafka.connect.runtime.errors.LogReporter:70)
java.lang.NullPointerException: Cannot invoke
"org.apache.kafka.connect.data.Field.schema()" because the return value of
"org.apache.kafka.connect.data.Schema.field(String)" is null
at
org.apache.kafka.connect.transforms.HeaderFrom.applyWithSchema(HeaderFrom.java:145)
at
org.apache.kafka.connect.transforms.HeaderFrom.apply(HeaderFrom.java:117)
at
org.apache.kafka.connect.runtime.TransformationStage.apply(TransformationStage.java:95)
at
org.apache.kafka.connect.runtime.TransformationChain.lambda$apply$0(TransformationChain.java:58)
at
org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:207)
at
org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:243)
at
org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:179)
at
org.apache.kafka.connect.runtime.TransformationChain.apply(TransformationChain.java:58)
at
org.apache.kafka.connect.runtime.WorkerSinkTask.convertAndTransformRecord(WorkerSinkTask.java:585)
at
org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:532)
at
org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:358)
at
org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:261)
at
org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:225)
at
org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:243)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:298)
at
org.apache.kafka.connect.runtime.isolation.Plugins.lambda$withClassLoader$1(Plugins.java:252)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:545)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:328)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
at java.base/java.lang.Thread.run(Thread.java:1474)
{code}
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