murong00 opened a new issue #6343: Broker failed to start when specifying a list of bookie groups URL: https://github.com/apache/pulsar/issues/6343 **Describe the bug** When set `bookkeeperClientIsolationGroups` to a list of bookie groups (e.g. group1,group2), pulsar service failed to start: ``` 18:33:22.906 [main] ERROR org.apache.pulsar.PulsarBrokerStarter - Failed to start pulsar service. org.apache.pulsar.broker.PulsarServerException: java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String at org.apache.pulsar.broker.PulsarService.start(PulsarService.java:526) ~[pulsar-broker-2.6.0-SNAPSHOT.jar:2.6.0-SNAPSHOT] at org.apache.pulsar.PulsarBrokerStarter$BrokerStarter.start(PulsarBrokerStarter.java:274) ~[pulsar-broker-2.6.0-SNAPSHOT.jar:2.6.0-SNAPSHOT] at org.apache.pulsar.PulsarBrokerStarter.main(PulsarBrokerStarter.java:339) [pulsar-broker-2.6.0-SNAPSHOT.jar:2.6.0-SNAPSHOT] ``` **Expected behavior** Pulsar service should start successfully when specifying a list of bookie groups. **Describe the solution you'd like** Add type judgment when get `String` property.
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