jarredhj0214 opened a new issue, #12014:
URL: https://github.com/apache/gravitino/issues/12014
### Version
main branch
### Describe what's wrong
When generated Java code is compiled or resolved inside Gravitino's isolated
catalog classloader, simple names from `java.lang`, such as `Override`, may be
requested directly from the classloader.
`IsolatedClassLoader` currently treats names without a package as normal
class names and fails to resolve them as `java.lang` classes. This can break
codegen-based libraries that rely on the context classloader, such as Janino
usage triggered by generated-code paths.
### Error message and/or stacktrace
The generated-code path may fail with `ClassNotFoundException` for simple
`java.lang` names, for example:
```text
ClassNotFoundException: Class not found Override
```
### How to reproduce
Use a catalog/library path that performs Java code generation under
Gravitino's isolated classloader and asks the context classloader to resolve
simple `java.lang` annotation names.
A minimal reproduction is loading `Override` through `IsolatedClassLoader`:
```java
classLoader.withClassLoader(cl -> cl.loadClass("Override"));
```
Before the fix this fails; after the fix it resolves to `java.lang.Override`.
### Additional context
This is a compatibility issue in `IsolatedClassLoader` class resolution. The
fix should not declare support for a new Paimon version; it only makes the
isolated classloader correctly handle simple `java.lang` names used by
generated-code / Janino paths.
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