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Posted to dev@flink.apache.org by "victor.jiang (Jira)" <ji...@apache.org> on 2020/03/26 07:06:00 UTC
[jira] [Created] (FLINK-16794) ClassNotFoundException caused by
ClassLoader.getSystemClassLoader using impertinently
victor.jiang created FLINK-16794:
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Summary: ClassNotFoundException caused by ClassLoader.getSystemClassLoader using impertinently
Key: FLINK-16794
URL: https://issues.apache.org/jira/browse/FLINK-16794
Project: Flink
Issue Type: Improvement
Components: Client / Job Submission, Runtime / REST
Affects Versions: 1.8.3, 1.8.2, 1.8.1, 1.8.0
Reporter: victor.jiang
In same containerization environment，the context classloader is not the SystemClassLoader，it uses the customized classloader usually for the classes isolation ，so the ClassNotFoundException may be caused。recommends using getClass/Caller/ThreadCurrentContext 's ClassLoader。
The related sources below:
1.flink-clients\src\main\java\org\apache\flink\client\program\ClusterClient.java"(690,33): return getAccumulators(jobID, ClassLoader.getSystemClassLoader());
2.flink-clients\src\main\java\org\apache\flink\client\program\MiniClusterClient.java"(148,33): return getAccumulators(jobID, ClassLoader.getSystemClassLoader());
3.flink-runtime\src\main\java\org\apache\flink\runtime\blob\BlobUtils.java"(348,66): return (Throwable) InstantiationUtil.deserializeObject(bytes, ClassLoader.getSystemClassLoader());
4.flink-runtime\src\main\java\org\apache\flink\runtime\rest\messages\json\SerializedThrowableDeserializer.java"(52,68): return InstantiationUtil.deserializeObject(serializedException, ClassLoader.getSystemClassLoader());
5.flink-runtime\src\main\java\org\apache\flink\runtime\rpc\messages\RemoteRpcInvocation.java"(118,67): methodInvocation = serializedMethodInvocation.deserializeValue(ClassLoader.getSystemClassLoader());
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