[Bug] JSONException: not support unquoted name

[zhishengzhang]

Before Creating the Bug Report

• I found a bug, not just asking a question, which should be created in GitHub Discussions.

• I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

When upgrading RocketMQ from 5.4.0 to 5.5.0, the Slave node throws
com.alibaba.fastjson2.JSONException: not support unquoted name
during consumerOffset synchronization.

2026-04-30 14:08:29 ERROR BrokerControllerScheduledThread1 - SyncConsumerOffset Exception, 10.10.10.76:10911
com.alibaba.fastjson2.JSONException: not support unquoted name, offset 1608, character 0, line 1, column 1608, fastjson-version 2.0.59 {"dataVersion":{"counter":565102,"stateVersion":34,"timestamp":1777529309588},"groupTopicMap":{"gid-test-rocketmq-tx":["%RETRY%gid-test-rocketmq-tx","TopicTest-tx-high"],"CID_RMQ_SYS_TRANS":["RMQ_SYS_TRANS_HALF_TOPIC","RMQ_SYS_TRANS_OP_HALF_TOPIC"],"GID-test_rmq_5point4":["%RETRY%GID-test_rmq_5point4","test_rmq_5point4"],"GID-test_tx_controller_mode":["%RETRY%GID-test_tx_controller_mode","test_tx_controller_mode"],"GID_TopicTest-delay-upgrade":["TopicTest-delay-upgrade","%RETRY%GID_TopicTest-delay-upgrade"],"gid-test-rocketmq":["TopicTest-high","%RETRY%gid-test-rocketmq"]},"offsetTable":{"%RETRY%GID-test_rmq_5point4@GID-test_rmq_5point4":{0:0},"%RETRY%gid-test-rocketmq-tx@gid-test-rocketmq-tx":{0:0},"TopicTest-high@gid-test-rocketmq":{0:3959363757,1:3959136846,2:80629020,3:80629016,4:80629008,5:80628834,6:80629199,7:80629026,8:63966738,9:63966733,10:63966732,11:63966737,12:63966738,13:63966747,14:63966744,15:63966742},"RMQ_SYS_TRANS_HALF_TOPIC@CID_RMQ_SYS_TRANS":{0:2166432},"test_rmq_5point4@GID-test_rmq_5point4":{0:667273,1:667276},"%RETRY%GID-test_tx_controller_mode@GID-test_tx_controller_mode":{0:0},"TopicTest-tx-high@gid-test-rocketmq-tx":{0:182636,1:170672,2:154594,3:166873,4:13608,5:13606,6:13608,7:13599},"%RETRY%GID_TopicTest-delay-upgrade@GID_TopicTest-delay-upgrade":{0:0},"%RETRY%gid-test-rocketmq@gid-test-rocketmq":{0:0},"TopicTest-delay-upgrade@GID_TopicTest-delay-upgrade":{0:24268,1:24270,2:24271,3:24272},"RMQ_SYS_TRANS_OP_HALF_TOPIC@CID_RMQ_SYS_TRANS":{0:129594},"test_tx_controller_mode@GID-test_tx_controller_mode":{0:47742,1:47741,2:47739,3:47735}},"pullOffsetTable":{"%RETRY%gid-test-rocketmq-tx@gid-test-rocketmq-tx":{0:0},"TopicTest-tx-high@gid-test-rocketmq-tx":{0:182636,1:170672,2:154594,3:166873},"%RETRY%gid-test-rocketmq@gid-test-rocketmq":{0:0},"TopicTest-high@gid-test-rocketmq":{0:3959363779,1:3959136868}}}
at com.alibaba.fastjson2.JSONReader.notSupportName(JSONReader.java:6564)
at com.alibaba.fastjson2.JSONReader.checkNameBegin(JSONReader.java:6558)
at com.alibaba.fastjson2.JSONReaderUTF8.skipName(JSONReaderUTF8.java:4286)
at com.alibaba.fastjson2.JSONReaderUTF8.skipObject(JSONReaderUTF8.java:4480)
at com.alibaba.fastjson2.JSONReaderUTF8.skipValue(JSONReaderUTF8.java:4698)
at com.alibaba.fastjson2.JSONReaderUTF8.skipObject(JSONReaderUTF8.java:4481)
at com.alibaba.fastjson2.JSONReaderUTF8.skipValue(JSONReaderUTF8.java:4698)
at com.alibaba.fastjson2.JSONReaderUTF8.skipValue(JSONReaderUTF8.java:4710)
at com.alibaba.fastjson2.reader.ObjectReaderBean.processExtra(ObjectReaderBean.java:134)
at com.alibaba.fastjson2.reader.ObjectReaderBean.processExtra(ObjectReaderBean.java:96)
at com.alibaba.fastjson2.reader.ObjectReaderAdapter.readFieldValue(ObjectReaderAdapter.java:512)
at com.alibaba.fastjson2.reader.ORG_24_2_ConsumerOffsetSerializeWrapper.readObject(Unknown Source)
at com.alibaba.fastjson2.JSON.parseObject(JSON.java:1605)
at org.apache.rocketmq.remoting.protocol.RemotingSerializable.decode(RemotingSerializable.java:47)
at org.apache.rocketmq.broker.out.BrokerOuterAPI.getAllConsumerOffset(BrokerOuterAPI.java:896)
at org.apache.rocketmq.broker.slave.SlaveSynchronize.syncConsumerOffset(SlaveSynchronize.java:130)
at org.apache.rocketmq.broker.slave.SlaveSynchronize.syncAll(SlaveSynchronize.java:67)
at org.apache.rocketmq.broker.controller.ReplicasManager.lambda$handleSlaveSynchronize$2(ReplicasManager.java:357)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

RocketMQ version

5.5.0

JDK Version

openjdk 11

Describe the Bug

When upgrading RocketMQ from 5.4.x to 5.5.x, the Slave node throws
com.alibaba.fastjson2.JSONException: not support unquoted name
during consumerOffset synchronization.

Steps to Reproduce

RocketMQ from 5.4.0 to 5.5.0

What Did You Expect to See?

maintain backward compatibility with data serialized by older versions

What Did You See Instead?

JSONException: not support unquoted name

Additional Context

No response

[zhishengzhang]

This is being addressed in PR #10283