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https://issues.apache.org/jira/browse/GROOVY-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16440025#comment-16440025
]
Paul King commented on GROOVY-7971:
-----------------------------------
Giving a compiler STC error would be better - treating it as a Map we need to
fix.
> @CS flow typing incorrectly casting to map at runtime
> -----------------------------------------------------
>
> Key: GROOVY-7971
> URL: https://issues.apache.org/jira/browse/GROOVY-7971
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.4.7
> Reporter: Graeme Rocher
> Priority: Major
>
> The following code:
> {code}
> import groovy.json.*
> import groovy.transform.*
> @CompileStatic
> class Bar {
> private Writable renderTemplate(Object o, Map args) {
>
> }
> private boolean isSimpleType(Class type) {
> return type == String
> }
> def foo(Map map, Map arguments) {
>
> def writable = new Writable() {
> @Override
> Writer writeTo(Writer out) throws IOException {
> for(entry in map.entrySet()) {
> def value = entry.value
> if(isSimpleType(value.getClass()) || (value instanceof
> Map)) {
> out.append(JsonOutput.toJson(value))
> }
> }
> return out
> }
> }
> }
> }
> writable = new Bar().foo([one:'two'],[foo:'bar'])
> sw = new StringWriter()
> writable.writeTo(sw)
> println sw
> {code}
> Fails with:
> {code}
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
> object 'two' with class 'java.lang.String' to class 'java.util.Map'
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232)
>
> {code}
> For some reason Groovy is attempting to cast value to Map when it isn't one.
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