jiangpengcheng opened a new issue, #19885:
URL: https://github.com/apache/pulsar/issues/19885

   ### Search before asking
   
   - [X] I searched in the [issues](https://github.com/apache/pulsar/issues) 
and found nothing similar.
   
   
   ### Version
   
   2.11.0
   
   ### Minimal reproduce step
   
   1. start a pulsar docker container:
   
   ```
   docker run -td --name temp apachepulsar/pulsar-all:2.11.0 bin/pulsar 
standalone
   ```
   
   2. start java instance directly
   
   ```
   docker exec -it temp bash
   
   java -cp /pulsar/instances/java-instance.jar 
-Dpulsar.functions.instance.classpath=/pulsar/lib/* 
-Dlog4j.configurationFile=/pulsar/conf/java-log/java_instance_log4j.xml 
-Dpulsar.function.log.dir=logs/functions 
-Dpulsar.function.log.file=function-download-sample-inferring-type-0  -Xmx1G  
org.apache.pulsar.functions.instance.JavaInstanceMain --jar 
examples/api-examples.jar --instance_id 0 --function_id 
0-cb240a82-ebaa-46b7-9357-199867704176 --function_version 0 --function_details 
'{"tenant":"public","namespace":"default","name":"function-download-sample-inferring-type","className":"org.apache.pulsar.functions.api.examples.ExclamationFunction","logTopic":"persistent://public/default/logging-function-logs","secretsMap":"{\"name\":{\"path\":\"test-secret\",\"key\":\"username\"},\"pwd\":{\"path\":\"test-secret\",\"key\":\"password\"}}","autoAck":true,"parallelism":1,"source":{"inputSpecs":{"persistent://public/default/input-download-java-topic":{}},"subscriptionPosition":"EARLIEST"},"si
 
nk":{"topic":"persistent://public/default/output-download-java-topic","forwardSourceMessageProperty":true},"resources":{"cpu":1,"ram":"1000000000"},"componentType":"FUNCTION"}'
 --pulsar_serviceurl pulsar://localhost:6650 --max_buffered_tuples 100 --port 
9093 --metrics_port 9094 --expected_healthcheck_interval -1 --cluster_name test 
--use_tls false --secrets_provider 
org.apache.pulsar.functions.secretsprovider.EnvironmentBasedSecretsProvider 
--pending_async_requests 1000
   ```
   
   ### What did you expect to see?
   
   instance start successfully
   
   ### What did you see instead?
   
   ```
   Exception in thread "main" java.lang.reflect.InvocationTargetException
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at 
org.apache.pulsar.functions.instance.JavaInstanceMain.main(JavaInstanceMain.java:104)
   Caused by: java.lang.NullPointerException: Cannot invoke 
"java.util.Map.containsKey(Object)" because "userConfigs" is null
        at 
org.apache.pulsar.functions.runtime.JavaInstanceStarter.inferringMissingTypeClassName(JavaInstanceStarter.java:313)
        at 
org.apache.pulsar.functions.runtime.JavaInstanceStarter.start(JavaInstanceStarter.java:178)
        ... 5 more
   ```
   
   ### Anything else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [X] I'm willing to submit a PR!


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