[FLINK-26527] ClassCastException in TemporaryClassLoaderContext

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 1.13.5, 1.14.3
• Component/s: Client / Job Submission
• Assignee: Unassigned
• Reporter: shizhengchao
• Created: 08/Mar/22 03:22
• Updated: 08/Mar/22 08:22
• Resolved: 08/Mar/22 08:22

Description

When I try to run sql using flink's classloader, I get the following exception：

Exception in thread "main" java.lang.ClassCastException: org.codehaus.janino.CompilerFactory cannot be cast to org.codehaus.commons.compiler.ICompilerFactory
    at org.codehaus.commons.compiler.CompilerFactoryFactory.getCompilerFactory(CompilerFactoryFactory.java:129) 
……

my code is like this：

Configuration configuration = new Configuration();
configuration.set(CoreOptions.CLASSLOADER_RESOLVE_ORDER, "child-first");
List<URL> dependencies = FlinkClassLoader.getFlinkDependencies(FLINK_HOME/lib);
URLClassLoader classLoader = ClientUtils.buildUserCodeClassLoader(
        dependencies,
        Collections.emptyList(),
        SessionContext.class.getClassLoader(),
        configuration);
try (TemporaryClassLoaderContext ignored = TemporaryClassLoaderContext.of(classLoader)) {     
       tableEnv.explainSql(sql);
     //CompilerFactoryFactory.getCompilerFactory("org.codehaus.janino.CompilerFactory");
} 

But, if you change `classloader.resolve-order` to `parent-first`, everything works fine