Usage with Grails Framework

[mradzinski]

If I follow the usage examples on a Grails v2.3.11 application I always get a MissingMethodException like the one below:

groovy.lang.MissingMethodException: No signature of method: rx.Observable.subscribe() is applicable for argument types: (my.package.TestController$_show_closure1)

Seems like the Subscribe() method does not allow closures, but as per the examples it should allow them.

I configured my dependencies like:

dependencies {
    compile 'io.reactivex:rxjava:1.0.14'
    compile 'io.reactivex:rxjava-groovy:1.0.2'
}

Any idea why is this happening? You can use the Hello World example to try reproducing this (it's the one I'm using).

[mradzinski]

Ok, there seems to be an issue with Grails framework and how it loads the Groovy ExtensionModules. Just add the below code to your BootStrap.init to make Grails load the ExtensionModules from your dependencies.

def loadGroovyExtensionModules() {
    Map<CachedClass, List<MetaMethod>> map = [:] 

    ClassLoader classLoader = Thread.currentThread().contextClassLoader 

    try { 
        Enumeration<URL> resources = classLoader.getResources(MetaClassRegistryImpl.MODULE_META_INF_FILE) 
        for (URL url in resources) {

            if (url.path.contains('groovy-all')) { 
             // already registered 
             continue 
            } 

            Properties properties = new Properties() 
            InputStream inStream 

            try { 
                inStream = url.openStream() 
                properties.load(inStream) 
                GroovySystem.metaClassRegistry.registerExtensionModuleFromProperties(properties, classLoader, map) 
            } catch (IOException e) { 
                throw new GroovyRuntimeException("Unable to load module META-INF descriptor", e) 
            } finally { 
                inStream?.close() 
            }

        } 
    } catch (IOException ignored) {} 

    map.each { CachedClass cls, List<MetaMethod> methods -> 
       cls.addNewMopMethods(methods)
    } 
}

[kevintanhongann]

What is the latest Gradle dependency to add into Grails for RxGroovy? Is this still valid?

[kevintanhongann]

I got somethign like this for mine Caused by: BUG! exception in phase 'canonicalization' in source unit '/.../Address.groovy' rx.lang.groovy.RxGroovyPropertiesModuleFactory cannot be cast to org.codehaus.groovy.runtime.m12n.PropertiesModuleFactory at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:174) at org.gradle.api.internal.tasks.compile.ApiGroovyCompiler.execute(ApiGroovyCompiler.java:56) at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerWorkerAdapter.execute(AbstractDaemonCompiler.java:73) at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerWorkerAdapter.execute(AbstractDaemonCompiler.java:64) at org.gradle.workers.internal.WorkerDaemonServer.execute(WorkerDaemonServer.java:29) at org.gradle.api.internal.tasks.compile.daemon.AbstractDaemonCompiler$CompilerDaemonServer.execute(AbstractDaemonCompiler.java:91) at org.gradle.process.internal.worker.request.WorkerAction.run(WorkerAction.java:88) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35) at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24) at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:147) at org.gradle.internal.remote.internal.hub.MessageHubBackedObjectConnection$DispatchWrapper.dispatch(MessageHubBackedObjectConnection.java:129) at org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:404) ... 2 more Caused by: java.lang.ClassCastException: rx.lang.groovy.RxGroovyPropertiesModuleFactory cannot be cast to org.codehaus.groovy.runtime.m12n.PropertiesModuleFactory at org.grails.compiler.gorm.DirtyCheckingTransformer.addDirtyCheckingSetter(DirtyCheckingTransformer.groovy:299) at org.grails.compiler.gorm.DirtyCheckingTransformer.performInjectionOnAnnotatedClass(DirtyCheckingTransformer.groovy:225) at org.grails.compiler.gorm.GormEntityTransformation.visit(GormEntityTransformation.groovy:200) at org.grails.compiler.gorm.GormTransformer.performInjection(GormTransformer.java:70) at org.grails.compiler.gorm.GormTransformer.performInjectionOnAnnotatedClass(GormTransformer.java:75) at org.grails.compiler.injection.ArtefactTypeAstTransformation.performInjection(ArtefactTypeAstTransformation.java:180) at org.grails.compiler.injection.GlobalGrailsClassInjectorTransformation.visit(GlobalGrailsClassInjectorTransformation.groovy:126) ... 14 more