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https://issues.apache.org/jira/browse/GROOVY-11474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-11474.
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Fix Version/s: 5.0.0-alpha-11
Resolution: Fixed
https://github.com/apache/groovy/commit/dc3053779f3b83b21a401454418f1eeafbc27e71
> flow typing on loops can introduce type unsafety
> ------------------------------------------------
>
> Key: GROOVY-11474
> URL: https://issues.apache.org/jira/browse/GROOVY-11474
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 5.0.0-alpha-11
>
>
> I have the following program
> {code:java}
> class Test {
> public static void main(String[] args) {
> def x = 1
> while (true) {
> Integer y = x
> x = ""
>
> }
> }
> }{code}
> h3. Actual behavior
> The code compiles, but I get a CCE at runtime:
> {code:java}
> Exception in thread "main"
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
> object '' with class 'java.lang.String' to class 'java.lang.Integer'
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToNumber(DefaultTypeTransformation.java:177)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:294)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:248)
> at
> org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:336)
> at Test.main(test.groovy:5)
> {code}
> h3. Expected behavior
> The code should have been rejected.
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