[ https://issues.apache.org/jira/browse/GROOVY-8255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16096217#comment-16096217 ]
James Kleeh commented on GROOVY-8255: ------------------------------------- Another example {{@Grab(group='com.graphql-java', module='graphql-java', version='2.4.0') import graphql.language.* import graphql.schema.* @groovy.transform.CompileStatic abstract class Foo<T> { protected void getFetchArguments(DataFetchingEnvironment environment) { for (Field field: environment.fields) { List<Selection> selections = field.selectionSet?.selections ?: [] for (Selection selection: selections) { if (selection instanceof Field) { Field selectedField = (Field)selection } } } } }}} > Odd problems with flow typing and generics in Groovy 2.4.12+ > ------------------------------------------------------------ > > Key: GROOVY-8255 > URL: https://issues.apache.org/jira/browse/GROOVY-8255 > Project: Groovy > Issue Type: Bug > Affects Versions: 2.4.12 > Reporter: Graeme Rocher > > In order to get the GORM codebase to compile I had to make this change: > https://github.com/grails/grails-data-mapping/commit/1ef850c496d13d8ca915b27e76b6bfdb4e27377e > The code in question is: > {code} > /** > * Sets multipart values within the request body > * > * @param name The name of the multipart > * @param value The value of the multipart > */ > void setProperty(String name, value) { > if (value instanceof File) { > value = new FileSystemResource(value) > } > else if (value instanceof URL) { > value = new UrlResource(value) > } > else if (value instanceof InputStream) { > value = new InputStreamResource(value) > } > else if (value instanceof GString) { > value = value.toString() > } > if( mvm[name] ) { > mvm[name].add value > } > else { > mvm.put(name, [value]) // <--- FAILS COMPILATION HERE > } > } > {code} > No matter what I tried I could not get it into to compile. The method accepts > `put(String, List<Object>)` but fails compilation with: > {code} > RequestCustomizer.groovy: 392: [Static type checking] - Cannot call > org.springframework.util.MultiValueMap <String, Object>#put(java.lang.String, > java.lang.Object) with arguments [java.lang.String, java.util.List > <java.lang.String>] > @ line 392, column 13. > mvm.put(name, [value]) > ^ > {code} > Altering the code to: > {code} > List<Object> values = [value] > mvm.put(name, values) > {code} > Fails with: > {code} > RequestCustomizer.groovy: 392: [Static type checking] - Incompatible generic > argument types. Cannot assign java.util.List <java.lang.String> to: > java.util.List <Object> > @ line 392, column 35. > List<Object> values = [value] > ^ > RequestCustomizer.groovy: 393: [Static type checking] - Cannot call > org.springframework.util.MultiValueMap <String, Object>#put(java.lang.String, > java.lang.Object) with arguments [java.lang.String, java.util.List > <java.lang.String>] > @ line 393, column 13. > mvm.put(name, values) > ^ > 2 errors > {code} -- This message was sent by Atlassian JIRA (v6.4.14#64029)