Jzjsnow opened a new pull request, #4511:
URL: https://github.com/apache/flink-cdc/pull/4511
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## What is the purpose of this pull request?
Add a maven-shade relocation for com.zaxxer (HikariCP) in
flink-cdc-pipeline-connector-postgres so the connector uses the unified shaded
namespace org.apache.flink.cdc.connectors.shaded.com.zaxxer.
Other connectors already relocate com.zaxxer to avoid HikariCP class
conflicts when multiple connectors are bundled together. Postgres connector
included HikariCP in its artifact set but omitted the relocation, which can
produce runtime conflicts as follows:
```
2026-07-20 14:17:00,145 ERROR
org.apache.flink.runtime.entrypoint.ClusterEntrypoint [] - Fatal error
occurred in the cluster entrypoint.
java.util.concurrent.CompletionException:
org.apache.flink.client.deployment.application.ApplicationExecutionException:
Could not execute application.
at
java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
~[?:1.8.0_352]
at
java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
~[?:1.8.0_352]
at
java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:957)
~[?:1.8.0_352]
at
java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:940)
~[?:1.8.0_352]
at
java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:488)
~[?:1.8.0_352]
at
java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1990)
~[?:1.8.0_352]
at
org.apache.flink.client.deployment.application.ApplicationDispatcherBootstrap.runApplicationEntryPoint(ApplicationDispatcherBootstrap.java:337)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.deployment.application.ApplicationDispatcherBootstrap.lambda$runApplicationAsync$2(ApplicationDispatcherBootstrap.java:254)
~[flink-dist-1.20.1.jar:1.20.1]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
~[?:1.8.0_352]
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
~[?:1.8.0_352]
at
org.apache.flink.runtime.concurrent.pekko.ActorSystemScheduledExecutorAdapter$ScheduledFutureTask.run(ActorSystemScheduledExecutorAdapter.java:172)
~[?:?]
at
org.apache.flink.runtime.concurrent.ClassLoadingUtils.runWithContextClassLoader(ClassLoadingUtils.java:68)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.runtime.concurrent.ClassLoadingUtils.lambda$withContextClassLoader$0(ClassLoadingUtils.java:41)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.pekko.dispatch.TaskInvocation.run(AbstractDispatcher.scala:59)
[flink-rpc-akka1ce3455b-913b-4d52-b0bf-518e598f7860.jar:1.20.1]
at
org.apache.pekko.dispatch.ForkJoinExecutorConfigurator$PekkoForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:61)
[flink-rpc-akka1ce3455b-913b-4d52-b0bf-518e598f7860.jar:1.20.1]
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
[?:1.8.0_352]
at
java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
[?:1.8.0_352]
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
[?:1.8.0_352]
at
java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
[?:1.8.0_352]
Caused by:
org.apache.flink.client.deployment.application.ApplicationExecutionException:
Could not execute application.
... 13 more
Caused by: org.apache.flink.client.program.ProgramInvocationException: The
main method caused an error:
org.apache.flink.cdc.connectors.shaded.com.zaxxer.hikari.pool.HikariProxyConnection
cannot be cast to org.postgresql.core.BaseConnection
at
org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:373)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:223)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:113)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.deployment.application.ApplicationDispatcherBootstrap.runApplicationEntryPoint(ApplicationDispatcherBootstrap.java:301)
~[flink-dist-1.20.1.jar:1.20.1]
... 12 more
Caused by: java.lang.ClassCastException:
org.apache.flink.cdc.connectors.shaded.com.zaxxer.hikari.pool.HikariProxyConnection
cannot be cast to org.postgresql.core.BaseConnection
at
io.debezium.connector.postgresql.TypeRegistry.getTypeInfo(TypeRegistry.java:510)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
io.debezium.connector.postgresql.TypeRegistry.access$100(TypeRegistry.java:40)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
io.debezium.connector.postgresql.TypeRegistry$SqlTypeMapper.<init>(TypeRegistry.java:440)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
io.debezium.connector.postgresql.TypeRegistry$SqlTypeMapper.<init>(TypeRegistry.java:410)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
io.debezium.connector.postgresql.TypeRegistry.<init>(TypeRegistry.java:121)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
io.debezium.connector.postgresql.connection.PostgresConnection.<init>(PostgresConnection.java:167)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.connectors.postgres.source.PostgresDialect.openJdbcConnection(PostgresDialect.java:90)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.connectors.postgres.source.PostgresDialect.openJdbcConnection(PostgresDialect.java:101)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.connectors.postgres.utils.PostgresSchemaUtils.listTables(PostgresSchemaUtils.java:76)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.connectors.postgres.factory.PostgresDataSourceFactory.createDataSource(PostgresDataSourceFactory.java:190)
~[flink-cdc-pipeline-connector-postgres-cty-3.4-1.5.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.composer.flink.translator.DataSourceTranslator.createDataSource(DataSourceTranslator.java:101)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.composer.flink.FlinkPipelineComposer.translate(FlinkPipelineComposer.java:191)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.composer.flink.FlinkPipelineComposer.compose(FlinkPipelineComposer.java:110)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at
org.apache.flink.cdc.cli.CliExecutor.deployWithComposer(CliExecutor.java:101)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at org.apache.flink.cdc.cli.CliExecutor.run(CliExecutor.java:79)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at org.apache.flink.cdc.cli.CliFrontend.main(CliFrontend.java:86)
~[flink-cdc-dist-3.4.0.jar:cty-3.4-1.5]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[?:1.8.0_352]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[?:1.8.0_352]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[?:1.8.0_352]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_352]
at
org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:356)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:223)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:113)
~[flink-dist-1.20.1.jar:1.20.1]
at
org.apache.flink.client.deployment.application.ApplicationDispatcherBootstrap.runApplicationEntryPoint(ApplicationDispatcherBootstrap.java:301)
~[flink-dist-1.20.1.jar:1.20.1]
... 12 more
```
## Brief change log
- Added relocation block for com.zaxxer →
org.apache.flink.cdc.connectors.shaded.com.zaxxer in the maven-shade-plugin
configuration of flink-cdc-pipeline-connector-postgres/pom.xml.
---
## Verifying this change
- Built pipeline connector packages of pg and mysql
- Run integration scenario with multiple connectors to confirm no HikariCP
linkage errors.
Notes: This mirrors shading in other connectors (mysql, oracle, etc.) and is
a safe, low-risk packaging change.
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable / docs / JavaDocs /
not documented)
---
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