Affects PMD Version: 6.x
Rule: UnusedLocalVariable
Description:
If a try-with-resources defines a local variable but it is not used in the try-block, the rule should flag this variable as unused. If some weird action is happening on creation and closing (because close() is automatically executed by the try-with-resources) and the code can't be removed, then the variable should be named like unused - then it will be ignored by the rule.
Note: This is fixed already with PMD 7.0.0-rc1.
Found via #3123.
Code Sample demonstrating the issue:
import java.io.InputStream;
public class UnusedUsedLocalVar {
public boolean run() {
boolean canRead = false;
try(InputStream resource = open()) { // violation expected
canRead = true;
} catch (Throwable ignore) {}
return canRead;
}
private InputStream open() { return null; }
}
Expected outcome:
PMD should report a violation at line 5, but doesn't. This is a false-negative.
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