You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@flink.apache.org by "victor.jiang (Jira)" <ji...@apache.org> on 2020/04/03 05:05:00 UTC
[jira] [Commented] (FLINK-16794) ClassNotFoundException caused by
ClassLoader.getSystemClassLoader using impertinently
[ https://issues.apache.org/jira/browse/FLINK-16794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17074280#comment-17074280 ]
victor.jiang commented on FLINK-16794:
--------------------------------------
Hi Till Rohrmann,
In our application scenario for flink-client usage, we create a customized ClassLoader for loading flink dependent jars, in order to avoid the conflict with our app's jars.
For the improvement , pls fix it.
> 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: 1.8.0, 1.8.1, 1.8.2, 1.8.3
> Reporter: victor.jiang
> Priority: Major
>
> In some 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());
--
This message was sent by Atlassian Jira
(v8.3.4#803005)