munendrasn opened a new pull request, #10872:
URL: https://github.com/apache/iceberg/pull/10872
When `ResolvingFileIo` is invoked without conf set (which can happen when
catalog or fileIo is explicitly created), it throws NPE.
```
java.lang.NullPointerException
at
org.apache.iceberg.io.ResolvingFileIO.lambda$io$1(ResolvingFileIO.java:179)
at
java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
at org.apache.iceberg.io.ResolvingFileIO.io(ResolvingFileIO.java:176)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
org.apache.iceberg.common.DynMethods$UnboundMethod.invokeChecked(DynMethods.java:62)
at
org.apache.iceberg.common.DynMethods$UnboundMethod.invoke(DynMethods.java:74)
at
org.apache.iceberg.common.DynMethods$BoundMethod.invoke(DynMethods.java:171)
```
The workaround is set to `Configuration` always.
For example, while creating the RESTCatalog like below but the order need to
be maintained
```java
RESTCatalog catalog = new RESTCatalog();
catalog.setConf(new Configuration());
catalog.initialize("rest", Map.of());
```
Exception HadoopFileIO, conf is not required or unused for other FileIo impl
hence, handling with soft check, other option was to have strict check and fail
if it is not set
[here](https://github.com/apache/iceberg/blob/b17d1c9abdb8fbd668ac02194cadd6003c3e37f7/core/src/main/java/org/apache/iceberg/io/ResolvingFileIO.java#L177)
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