[jira] [Created] (FLINK-11122) SafetyNetCloseableRegistryTest fails with ClassCastException

["Gary Yao (JIRA)" <ji...@apache.org>]

Gary Yao created FLINK-11122:
--------------------------------

             Summary: 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
             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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