ngjaying opened a new issue #2887: How to get user config at windowing function URL: https://github.com/apache/pulsar/issues/2887 Pulsar functions SDK is not supported for windowing function, then how can we get the user config? #### Expected behavior Allow to access context object at windowing function in order to get the user configs. #### Actual behavior Use Pulsar functions SDK to implement windowing function would get below error: ``` 06:41:11.925 [main] INFO org.apache.pulsar.admin.cli.CmdFunctions - ex: java.lang.ClassCastException: com.emqx.pulsar.functions.WindowRuleFunction cannot be cast to java.util.function.Function java.lang.ClassCastException: com.emqx.pulsar.functions.WindowRuleFunction cannot be cast to java.util.function.Function at org.apache.pulsar.functions.utils.Utils.getFunctionTypes(Utils.java:116) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.Utils.getFunctionTypes(Utils.java:108) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.validation.ValidatorImpls$FunctionConfigValidator.doJavaChecks(ValidatorImpls.java:358) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.validation.ValidatorImpls$FunctionConfigValidator.validateField(ValidatorImpls.java:506) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.validation.ConfigValidation.processAnnotations(ConfigValidation.java:130) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.validation.ConfigValidation.validateClass(ConfigValidation.java:73) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.functions.utils.validation.ConfigValidation.validateConfig(ConfigValidation.java:58) ~[org.apache.pulsar-pulsar-functions-utils-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdFunctions$FunctionDetailsCommand.validateFunctionConfigs(CmdFunctions.java:454) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdFunctions$FunctionDetailsCommand.convert(CmdFunctions.java:544) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdFunctions$FunctionDetailsCommand.convertProto2(CmdFunctions.java:670) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdFunctions$LocalRunner.runCmd(CmdFunctions.java:708) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdFunctions$BaseCommand.run(CmdFunctions.java:120) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.CmdBase.run(CmdBase.java:61) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.PulsarAdminTool.run(PulsarAdminTool.java:178) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] at org.apache.pulsar.admin.cli.PulsarAdminTool.main(PulsarAdminTool.java:228) [org.apache.pulsar-pulsar-client-tools-2.1.1-incubating.jar:2.1.1-incubating] com.emqx.pulsar.functions.WindowRuleFunction cannot be cast to java.util.function.Function ``` #### Steps to reproduce Create a Windowing function that implements Pulsar function SDK and then create/localrun it. #### System configuration **Pulsar version**: 2.1.1-incubating
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