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https://issues.apache.org/jira/browse/FLINK-11122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16716700#comment-16716700
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ASF GitHub Bot commented on FLINK-11122:
----------------------------------------
StefanRRichter commented on a change in pull request #7273: [FLINK-11122][core]
Change signature of WrappingProxyUtil#stripProxy(T)
URL: https://github.com/apache/flink/pull/7273#discussion_r240538098
##########
File path:
flink-core/src/main/java/org/apache/flink/util/WrappingProxyUtil.java
##########
@@ -31,15 +33,19 @@ private WrappingProxyUtil() {
}
@SuppressWarnings("unchecked")
- public static <T> T stripProxy(T object) {
+ public static <T> T stripProxy(@Nullable final WrappingProxy<T>
wrappingProxy) {
+ if (wrappingProxy == null) {
+ return null;
+ }
- T previous = null;
+ WrappingProxy<T> previous = null;
+ Object delegate = wrappingProxy.getWrappedDelegate();
- while (object instanceof WrappingProxy && previous != object) {
- previous = object;
- object = ((WrappingProxy<T>)
object).getWrappedDelegate();
+ while (delegate instanceof WrappingProxy && previous !=
delegate) {
+ previous = (WrappingProxy<T>) delegate;
+ delegate = ((WrappingProxy<T>)
delegate).getWrappedDelegate();
Review comment:
I think casting to `(WrappingProxy<T>)` here is problematic because the
getter will already implicitly cast the returned object to `T` and you are in
the cast exception that the rest of the code tries to avoid now. I suggest
maybe rather this:
```
Object previous = null;
Object delegate = wrappingProxy.getWrappedDelegate();
while (delegate instanceof WrappingProxy && previous !=
delegate) {
previous = delegate;
delegate = ((WrappingProxy<?>)
delegate).getWrappedDelegate();
}
return (T) delegate;
```
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> SafetyNetCloseableRegistryTest fails with ClassCastException
> ------------------------------------------------------------
>
> Key: FLINK-11122
> URL: https://issues.apache.org/jira/browse/FLINK-11122
> Project: Flink
> Issue Type: Sub-task
> Components: Tests
> Reporter: Gary Yao
> Assignee: Gary Yao
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> When compiling and running {{SafetyNetCloseableRegistryTest}} with Java 9,
> some tests fail with a {{ClassCastException}}
> {noformat}
> java.lang.AssertionError: java.lang.ClassCastException:
> org.apache.flink.core.fs.local.LocalDataOutputStream cannot be cast to
> org.apache.flink.core.fs.WrappingProxyCloseable
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry$PhantomDelegatingCloseableRef.<init>(SafetyNetCloseableRegistry.java:156)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry.doRegister(SafetyNetCloseableRegistry.java:99)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry.doRegister(SafetyNetCloseableRegistry.java:50)
> at
> org.apache.flink.util.AbstractCloseableRegistry.registerCloseable(AbstractCloseableRegistry.java:79)
> at
> org.apache.flink.core.fs.ClosingFSDataOutputStream.wrapSafe(ClosingFSDataOutputStream.java:101)
> at
> org.apache.flink.core.fs.SafetyNetWrapperFileSystem.create(SafetyNetWrapperFileSystem.java:127)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistryTest$3.go(SafetyNetCloseableRegistryTest.java:120)
> at
> org.apache.flink.core.testutils.CheckedThread.run(CheckedThread.java:74)
> {noformat}
> This is due to the problematic signature in
> {{WrappingProxyUtil#stripProxy(T)}}, which expects a generic type {{T}} and
> also returns {{T}}.
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