asnowfox edited a comment on issue #2468:
URL: https://github.com/apache/iceberg/issues/2468#issuecomment-906226578
I think I found the reason of this problem. in DynConstructors.java which
borrowed from parquet-common, the ClassLoader in Builder is a loader of
currentThread, looks like this
```
public static class Builder {
private final Class<?> baseClass;
private ClassLoader loader =
Thread.currentThread().getContextClassLoader();
private Ctor ctor = null;
private Map<String, Throwable> problems = new HashMap<String,
Throwable>();
public Builder(Class<?> baseClass) {
this.baseClass = baseClass;
}
public Builder() {
this.baseClass = null;
}
......
```
So, when during runtime, the dynamic class is loaded by current thread, and
the base class/interface is not loaded by current thread. it will have the
cast Exception.
solution:
```
public static class Builder {
private final Class<?> baseClass;
private ClassLoader loader =
Thread.currentThread().getContextClassLoader();
private Ctor ctor = null;
private Map<String, Throwable> problems = new HashMap<String,
Throwable>();
public Builder(Class<?> baseClass) {
this.baseClass = baseClass;
this.loader = this.baseClass.getClassLoader();
}
public Builder() {
this.baseClass = null;
}
......
```
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