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https://issues.apache.org/jira/browse/FLINK-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16206774#comment-16206774
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Rong Rong commented on FLINK-7373:
----------------------------------
Hi [~fhueske], no we haven't found a great solution so we decided to work
around it by not allowing any extra jar which is not already included in the
UDF classpath.
> Using URLClassLoader to load UDF triggers HepPlanner unexpected
> ClassNotFoundException
> --------------------------------------------------------------------------------------
>
> Key: FLINK-7373
> URL: https://issues.apache.org/jira/browse/FLINK-7373
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.3.1
> Reporter: Rong Rong
> Assignee: Rong Rong
>
> Using URLClassLoader to load, say from Artifactory, and instantiate UDF
> instances will cause some Rule failed during runHepPlanner or
> runVolcanoPlanner.
> One example could add an ITCase in:
> {code:title=flink-libraries/flink-table/src/test/scala/org/apache/flink/table/runtime/batch/table/CalcITCase.scala}
> @Test
> def testUserDefinedFunctionDynamicClassloader() {
> val env = ExecutionEnvironment.getExecutionEnvironment
> val tableEnv = TableEnvironment.getTableEnvironment(env, config)
> val jarFileURI = "file://org/apache/flink/table/udf/HelloWorld.jar"
> val udfClassLoader: ClassLoader = new URLClassLoader(List(new
> URI(jarFileURI).toURL).toArray)
> val clazz =
> udfClassLoader.loadClass("org.apache.flink.table.udf.HelloWorld")
> val helloWorldUDF: ScalarFunction =
> clazz.newInstance().asInstanceOf[ScalarFunction]
> tableEnv.registerFunction("helloWorld", helloWorldUDF)
> val table = env.fromElements("a", "b", "c").toTable(tableEnv, 'text)
> val result = table.select("text.helloWorld()")
> val results = result.toDataSet[Row].collect()
> val expected = "Hello World"
> TestBaseUtils.compareResultAsText(results.asJava, expected)
> }
> {code}
> where
> {code:title=HelloWorld.java}
> package org.apache.flink.table.udf;
> import org.apache.flink.table.functions.ScalarFunction;
> public class HelloWorld extends ScalarFunction {
> public String eval() {
> return "Hello World";
> }
> }
> {code}
> This triggers the following Exception:
> {panel:title=Exception}
> org.apache.flink.api.common.InvalidProgramException: Table program cannot be
> compiled. This is a bug. Please file an issue.
> at
> org.apache.flink.table.codegen.Compiler$class.compile(Compiler.scala:36)
> at
> org.apache.flink.table.runtime.FlatMapRunner.compile(FlatMapRunner.scala:31)
> at
> org.apache.flink.table.runtime.FlatMapRunner.open(FlatMapRunner.scala:45)
> at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
> at
> org.apache.flink.api.common.operators.base.FlatMapOperatorBase.executeOnCollections(FlatMapOperatorBase.java:62)
> ......
> Caused by: org.codehaus.commons.compiler.CompileException: Line 6, Column 22:
> Cannot determine simple type name "org"
> at
> org.codehaus.janino.UnitCompiler.compileError(UnitCompiler.java:11672)
> at
> org.codehaus.janino.UnitCompiler.getReferenceType(UnitCompiler.java:6416)
> at
> org.codehaus.janino.UnitCompiler.getReferenceType(UnitCompiler.java:6177)
> ......
> {panel}
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