[ 
https://issues.apache.org/jira/browse/FLINK-26527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

shizhengchao updated FLINK-26527:
---------------------------------
    Description: 
When I try to run sql using flink's classloader, I get the following exception:
{code:java}
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)
 
……{code}
my code is like this:
{code:java}
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");
} {code}
But, if you change `classloader.resolve-order` to `parent-first`, everything 
works fine

  was:
When I try to run sql using flink's classloader, I get the following exception:
{code:java}
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)
 
……{code}
my code is like this:
{code:java}
Configuration configuration = new Configuration();
configuration.set(CoreOptions.CLASSLOADER_RESOLVE_ORDER, "child-first");
List<URL> dependencies = FlinkClassLoader.getFlinkDependencies(
{code}
{color:#000091}${FLINK_HOME}/lib{color}
{code:java}
);
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");
} {code}
But, if you change `classloader.resolve-order` to `parent-first`, everything 
works fine


> ClassCastException in TemporaryClassLoaderContext
> -------------------------------------------------
>
>                 Key: FLINK-26527
>                 URL: https://issues.apache.org/jira/browse/FLINK-26527
>             Project: Flink
>          Issue Type: Bug
>          Components: Client / Job Submission
>    Affects Versions: 1.13.5, 1.14.3
>            Reporter: shizhengchao
>            Priority: Major
>
> When I try to run sql using flink's classloader, I get the following 
> exception:
> {code:java}
> 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)
>  
> ……{code}
> my code is like this:
> {code:java}
> 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");
> } {code}
> But, if you change `classloader.resolve-order` to `parent-first`, everything 
> works fine



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