AntiBit82 opened a new issue, #19986:
URL: https://github.com/apache/pulsar/issues/19986

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/pulsar/issues) 
and found nothing similar.
   
   
   ### Version
   
   Pulsar 2.11
   JDBC Sink Connecrtor 2.11
   OS: MacOS Ventura
   
   ### Minimal reproduce step
   
   Simple class Customer:
   `public class Customer {
       private int id;
       private String name;
       private String address;
       private int age;
   
       public Customer() {}
   
       public Customer(int id, String name, String address, int age) {
           this.id = id;
           this.name = name;
           this.address = address;
           this.age = age;
       }
   
   //getters/setters/toString, etc.
   }
   `
   I have a Postgres DB running with resp. customer table.
   
   In Pulsar standalone I create a JDBC PostgreSQL sink:
   `bin/pulsar-admin sinks create --sink-config-file conf/sinkcustomer.yaml`
   
   Here's the config:
   `tenant: "mynamespace"
   namespace: "test"
   name: "customer-sink"
   inputs: [ "persistent://mynamespace/test/customer" ]
   key: "id"
   nonKey: "name,address,age"
   sinkType: "jdbc-postgres"
   configs:
       userName: "postgres"
       password: "postgres"
       jdbcUrl: "jdbc:postgresql://localhost:5432/postgres"
       tableName: "customer"`
   
   Now produce some events:
   `   
           Producer<Customer> pc = ...
   
           pc.newMessage(Schema.AVRO(Customer.class)).value(new 
Customer(1,"XXX","Snowy Mountain 1",40)).send();
        
           pc.newMessage(Schema.AVRO(Customer.class)).value(new Customer(1, 
"YYY", "Sunny Greek Beach", 40))
                   .property("ACTION","DELETE").send();
   // You could also use "UPDATE", same problem will appear
   `
   
   First insert of the customer works fine.
   Second delete / update throws NPE.
   
   ### What did you expect to see?
   
   Expect the customer to be updated or deleted
   
   ### What did you see instead?
   
   `[pool-5-thread-1] ERROR org.apache.pulsar.io.jdbc.JdbcAbstractSink - Got 
exception 
   java.lang.NullPointerException: Cannot invoke 
"java.sql.PreparedStatement.execute()" because "this.deleteStatement" is null
        at 
org.apache.pulsar.io.jdbc.JdbcAbstractSink.flush(JdbcAbstractSink.java:241) 
~[pulsar-io-jdbc-core-2.11.0.jar:?]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) ~[?:?]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) 
~[?:?]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
 ~[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) 
~[?:?]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) 
~[?:?]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
   `
   
   or same message with 'this.updateStatement is null'
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [ ] I'm willing to submit a PR!


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