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https://issues.apache.org/jira/browse/FLINK-39686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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tonyabasy closed FLINK-39686.
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Resolution: Duplicate
> URI used as URL in SessionContext causes ArrayStoreException
> ------------------------------------------------------------
>
> Key: FLINK-39686
> URL: https://issues.apache.org/jira/browse/FLINK-39686
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Gateway
> Reporter: tonyabasy
> Priority: Major
>
> ## Location
> `flink-table/flink-sql-gateway/src/main/java/org/apache/flink/table/gateway/service/context/SessionContext.java`
> line 306
> ## Faulty Code
> ```java
> defaultContext.getDependencies().toArray(new URL[0])
> ```
> ## Root Cause
> `DefaultContext.getDependencies()` returns `List<URI>` (`java.net.URI`), but
> the code calls `.toArray(new URL[0])`.
> `java.net.URI` and `java.net.URL` are **completely unrelated classes** (no
> inheritance relationship), so a `URL[]` array cannot hold `URI` objects.
> Java's `List.toArray(T[])` generic method does not check element type
> compatibility at compile time, so this compiles successfully. However, it
> will **always throw `ArrayStoreException` at runtime** when the `toArray`
> implementation attempts to store a `URI` into a `URL[]`.
> ## When It Triggers
> This bug triggers when `defaultContext.getDependencies()` returns a non-empty
> list. It currently goes unnoticed because:
> - `DefaultContext.load()` creates a DefaultContext with an empty dependency
> list (the `dependencies` parameter is always empty in current callers)
> - `ScriptRunner` passes `Collections.emptyList()` directly (empty array,
> `toArray` never needs to store elements, so no exception)
> Once anyone creates a DefaultContext with non-empty dependencies, the
> exception will fire.
> ## Fix
> Convert each `URI` to `URL` individually:
> ```java
> defaultContext.getDependencies().stream()
> .map(uri -> uri.toURL())
> .toArray(URL[]::new)
> ```
> ## Introduced In
> FLINK 2.2.0 (commit: 5a336892424)
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