H Bill, I would recommend you to try that example with JDK 11. Support of JDK 17 is coming in Flink 1.18 https://issues.apache.org/jira/browse/FLINK-15736
Best regards, Alexey On Tue, Aug 29, 2023 at 11:50 AM Xu Bill <xuzhili1...@hotmail.com> wrote: > Hello, > > I'm new to Apache Flink. > I followed the instrunctions to run examples after installation > (as described here: > https://nightlies.apache.org/flink/flink-docs-stable/docs/try-flink/local_installation/#submitting-a-flink-job > ) > and also tried running an example java app > (as described here: > https://nightlies.apache.org/flink/flink-docs-release-1.17/docs/learn-flink/datastream_api/ > ) > > But both of them failed to start and gave me same error as below: > > Exception in thread "main" java.lang.reflect.InaccessibleObjectException: > Unable to make field private final byte[] java.lang.String.value > accessible: module java.base does not "opens java.lang" to unnamed module > @4ac3c60d > at > java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) > at > java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) > at > java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177) > at java.base/java.lang.reflect.Field.setAccessible(Field.java:171) > at > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:106) > at > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132) > at > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:132) > at > org.apache.flink.api.java.ClosureCleaner.clean(ClosureCleaner.java:69) > at > org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.clean(StreamExecutionEnvironment.java:2317) > at > org.apache.flink.streaming.api.datastream.DataStream.clean(DataStream.java:202) > at > org.apache.flink.streaming.api.datastream.DataStream.addSink(DataStream.java:1244) > at > org.apache.flink.streaming.api.datastream.DataStream.print(DataStream.java:937) > at test.flink.Example.main(Example.java:25) > > Could anybody help give a solution on this? > > I am using OpenJDK 17. > > openjdk version "17.0.1" 2021-10-19 > OpenJDK Runtime Environment (build 17.0.1+12-39) > OpenJDK 64-Bit Server VM (build 17.0.1+12-39, mixed mode, sharing) > > Best regards, > Bill
