[GitHub] [shardingsphere] isHuangXin opened a new issue, #24869: Error (HY000): Unable to start CDC correctly due to 'PipelineContext.getContextManager()' is null

[via GitHub]

isHuangXin opened a new issue, #24869:
URL: https://github.com/apache/shardingsphere/issues/24869

   - When I try to start 
`org/apache/shardingsphere/data/pipeline/cdc/client/example/Bootstrap.java` 
i.e. when using CDC (Change Data Capture) function. I found that CDC could not 
start normally because the code reported the following error message
   
   `[ERROR] 2023-03-28 00:15:02.559 [nioEventLoopGroup-4-5] 
o.a.s.p.f.n.CDCChannelInboundHandler - caught CDC resolution error
   java.lang.NullPointerException: Cannot invoke 
"org.apache.shardingsphere.mode.manager.ContextManager.getMetaDataContexts()" 
because the return value of 
"org.apache.shardingsphere.data.pipeline.core.context.PipelineContext.getContextManager()"
 is null
        at 
org.apache.shardingsphere.proxy.backend.handler.cdc.CDCBackendHandler.streamData(CDCBackendHandler.java:85)
        at 
org.apache.shardingsphere.proxy.frontend.netty.CDCChannelInboundHandler.processStreamDataRequest(CDCChannelInboundHandler.java:181)
        at 
org.apache.shardingsphere.proxy.frontend.netty.CDCChannelInboundHandler.channelRead(CDCChannelInboundHandler.java:120)`
   
   - I found that the cause of the error is 
`org.apache.shardingsphere.data.pipeline.core.context.PipelineContext.getContextManager()`
 is null
   
   - So I debug the code in the idea
   I find that the `contextManager` always returns empty, which makes me very 
confused
   
   <img width="1868" alt="Screenshot 2023-03-28 at 00 29 16" 
src="https://user-images.githubusercontent.com/57054352/228004764-dcedb76e-1e88-4660-91e5-40d8fb020b3e.png";>
   
   <img width="1868" alt="Screenshot 2023-03-28 at 00 25 24" 
src="https://user-images.githubusercontent.com/57054352/228003788-4d27ab7f-528c-4de8-b486-6f8c970e9e2d.png";>
   <img width="1868" alt="Screenshot 2023-03-28 at 00 26 10" 
src="https://user-images.githubusercontent.com/57054352/228003971-5b42e913-bf73-4568-b397-cfed7a256961.png";>
   


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