W-dragan opened a new issue, #6508: URL: https://github.com/apache/seatunnel/issues/6508
### Search before asking - [X] I had searched in the [issues](https://github.com/apache/seatunnel/issues?q=is%3Aissue+label%3A%22bug%22) and found no similar issues. ### What happened When I submit more than 30 HTTP tasks instantaneously, it is a timed task that triggers the submission of more than 30 HTTP tasks to seatunel, causing errors. Do I need to use locking and other mechanisms to prevent concurrent errors Caused by: java.lang.ClassNotFoundException: org.apache.seatunnel.connectors.seatunnel.common.multitablesink.MultiTableSink ### SeaTunnel Version 2.3.4 ### SeaTunnel Config ```conf any ``` ### Running Command ```shell http ``` ### Error Exception ```log at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_212] at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_212] Caused by: java.lang.ClassNotFoundException: org.apache.seatunnel.connectors.seatunnel.common.multitablesink.MultiTableSink at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[?:1.8.0_212] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_212] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[?:1.8.0_212] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_212] at java.lang.Class.forName0(Native Method) ~[?:1.8.0_212] at java.lang.Class.forName(Class.java:264) ~[?:1.8.0_212] at com.hazelcast.internal.nio.ClassLoaderUtil.tryLoadClass(ClassLoaderUtil.java:297) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.nio.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:261) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.nio.IOUtil$ClassLoaderAwareObjectInputStream.resolveClass(IOUtil.java:867) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1868) ~[?:1.8.0_212] at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1751) ~[?:1.8.0_212] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042) ~[?:1.8.0_212] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573) ~[?:1.8.0_212] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2287) ~[?:1.8.0_212] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2211) ~[?:1.8.0_212] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2069) ~[?:1.8.0_212] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573) ~[?:1.8.0_212] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:431) ~[?:1.8.0_212] at com.hazelcast.internal.serialization.impl.defaultserializers.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:92) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.defaultserializers.JavaDefaultSerializers$JavaSerializer.read(JavaDefaultSerializers.java:85) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:44) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.AbstractSerializationService.readObject(AbstractSerializationService.java:349) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.ByteArrayObjectDataInput.readObject(ByteArrayObjectDataInput.java:600) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at org.apache.seatunnel.engine.core.dag.logical.LogicalVertex.readData(LogicalVertex.java:99) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.readInternal(DataSerializableSerializer.java:160) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:106) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:51) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:44) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.AbstractSerializationService.readObject(AbstractSerializationService.java:349) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.ByteArrayObjectDataInput.readObject(ByteArrayObjectDataInput.java:600) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at org.apache.seatunnel.engine.core.dag.logical.LogicalDag.readData(LogicalDag.java:154) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.readInternal(DataSerializableSerializer.java:160) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:106) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.DataSerializableSerializer.read(DataSerializableSerializer.java:51) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.StreamSerializerAdapter.read(StreamSerializerAdapter.java:44) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.internal.serialization.impl.AbstractSerializationService.toObject(AbstractSerializationService.java:268) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at com.hazelcast.jet.impl.execution.init.CustomClassLoadedObject.deserializeWithCustomClassLoader(CustomClassLoadedObject.java:66) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at org.apache.seatunnel.engine.server.master.JobMaster.init(JobMaster.java:210) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at org.apache.seatunnel.engine.server.CoordinatorService.lambda$submitJob$3(CoordinatorService.java:419) ~[seatunnel-starter.jar:2.3.4-baidu1.0.0-SNAPSHOT] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212] at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_212] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_212] at java.lang.Thread.run(Thread.java:748) ~[?:1.8.0_212] ``` ### Zeta or Flink or Spark Version _No response_ ### Java or Scala Version _No response_ ### Screenshots _No response_ ### Are you willing to submit PR? - [ ] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) -- This is an automated message from the Apache Git Service. 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