[ https://issues.apache.org/jira/browse/GROOVY-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15575793#comment-15575793 ]
Jochen Theodorou commented on GROOVY-7971: ------------------------------------------ I assume that the compiler only check for "instanceof Map" and fails to see, that it is not the only condition here > @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 > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)