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https://issues.apache.org/jira/browse/FLINK-22632?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu closed FLINK-22632.
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Resolution: Fixed
> CatalogFunctionImpl.isGeneric should use ContextClassLoader
> -----------------------------------------------------------
>
> Key: FLINK-22632
> URL: https://issues.apache.org/jira/browse/FLINK-22632
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.12.2, 1.13.0, 1.12.3
> Reporter: Zhong Zhuang
> Priority: Major
> Labels: easyfix
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Hello, community.
> I'm using Hive catalog, I'm trying to load UDF through HTTP.
> I registered a UDF, then I submited a FlinkSQL job with command line:
> {code:java}
> flink run ... -S "http://someHost/plusTwoFunc.jar"; ...{code}
> When the job started, it throws an Exception:(:
> {code:java}
> Caused by: java.lang.ClassNotFoundException: com.slankka.flink.udf.PlusTwoFunc
> at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:264)
> at
> org.apache.flink.table.catalog.CatalogFunctionImpl.isGeneric(CatalogFunctionImpl.java:72)
> {code}
> I know that user code is loaded by {{SafetyNetWrapperClassLoader}} . and
> {{FlinkUserCodeClassLoader}} , {{SafetyNetWrapperClassLoader}} is a facade
> classloader, {{FlinkUserCodeClassLoader}} is the real classloader whose
> classpath contains the jar dependency, but it failed to load udf in
> {{CatalogFunctionImpl}}
> {code:java}
> @Override
> public boolean isGeneric() {
> if (functionLanguage == FunctionLanguage.PYTHON) {
> return true;
> }
> try {
> Class c = Class.forName(className); //ClassNotFound
> if (UserDefinedFunction.class.isAssignableFrom(c)) {
> return true;
> }
> } catch (ClassNotFoundException e) {
> throw new RuntimeException(String.format("Can't resolve udf class
> %s", className), e);
> }
> return false;
> }
> {code}
> When I change to:
> {code:java}
> Thread.currentThread().getContextClassLoader().loadClass(className);
> {code}
> Then it works fine.
> My proposal is CatalogFunctionImpl.isGeneric should using ContextClassloader,
> that is {{FlinkUserCodeClassLoader}} proxied by
> {{SafetyNetWrapperClassLoader}}
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