Is Vaadin SASS compiliation working in Grails 2.4? - grails

Question

I am trying to use a custom theme with the grails-vaadin plugin on Grails 2.4, but each time my page is displayed I have the following error :
août 13, 2014 4:38:50 PM com.vaadin.sass.internal.util.DeepCopy log
GRAVE: null
java.lang.ClassNotFoundException: com.vaadin.sass.internal.tree.BlockNode
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:340)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:626)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1613)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1518)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1774)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at java.util.ArrayList.readObject(ArrayList.java:776)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springsource.loaded.ri.ReflectiveInterceptor.jlrMethodInvoke(ReflectiveInterceptor.java:1270)
at sun.reflect.GeneratedMethodAccessor116.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at java.io.ObjectStreamClass.__sljlrmi(ObjectStreamClass.java)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at com.vaadin.sass.internal.util.DeepCopy.copy(DeepCopy.java:60)
at com.vaadin.sass.internal.tree.Node.copy(Node.java:157)
at com.vaadin.sass.internal.tree.MixinDefNode.copy(MixinDefNode.java:74)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixinNode(MixinNodeHandler.java:45)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixins(MixinNodeHandler.java:40)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.traverse(MixinNodeHandler.java:30)
at com.vaadin.sass.internal.tree.MixinNode.doTraverse(MixinNode.java:61)
at com.vaadin.sass.internal.tree.NodeWithVariableArguments.traverse(NodeWithVariableArguments.java:95)
at com.vaadin.sass.internal.tree.Node.traverseChildren(Node.java:169)
at com.vaadin.sass.internal.ScssStylesheet.traverse(ScssStylesheet.java:307)
at com.vaadin.sass.internal.ScssStylesheet.compile(ScssStylesheet.java:249)
at com.vaadin.server.VaadinServlet.serveOnTheFlyCompiledScss(VaadinServlet.java:886)
at com.vaadin.server.VaadinServlet.serveStaticResourcesInVAADIN(VaadinServlet.java:642)
at com.vaadin.server.VaadinServlet.serveStaticResources(VaadinServlet.java:612)
at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:230)
at com.vaadin.grails.GrailsVaadinServlet.service(GrailsVaadinServlet.groovy)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at com.vaadin.grails.GrailsVaadinServlet.service(GrailsVaadinServlet.groovy)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.processFilterChain(UrlMappingsFilter.java:440)
at org.codehaus.groovy.grails.web.mapping.filter.UrlMappingsFilter.doFilterInternal(UrlMappingsFilter.java:241)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.codehaus.groovy.grails.web.servlet.mvc.GrailsWebRequestFilter.doFilterInternal(GrailsWebRequestFilter.java:69)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.codehaus.groovy.grails.web.filters.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:67)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
août 13, 2014 4:38:50 PM com.vaadin.sass.internal.tree.NodeWithVariableArguments traverse
GRAVE: null
java.lang.NullPointerException
at com.vaadin.sass.internal.tree.Node.copy(Node.java:158)
at com.vaadin.sass.internal.tree.MixinDefNode.copy(MixinDefNode.java:74)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixinNode(MixinNodeHandler.java:45)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.replaceMixins(MixinNodeHandler.java:40)
at com.vaadin.sass.internal.visitor.MixinNodeHandler.traverse(MixinNodeHandler.java:30)
at com.vaadin.sass.internal.tree.MixinNode.doTraverse(MixinNode.java:61)
at com.vaadin.sass.internal.tree.NodeWithVariableArguments.traverse(NodeWithVariableArguments.java:95)
at com.vaadin.sass.internal.tree.Node.traverseChildren(Node.java:169)
My UI is annotated :
#Theme("mytheme")
class MyUI extends UI {
...
}
I followed this guide
So i created a styles.scss file in this path :
web-app/WEB-INF/themes/mytheme/styles.scss
Does someone succeded with Vaadin scss compilation on Grails 2.4 ?
Note : my plugin configuration is :
plugins {
// plugins for the build system only
build ":tomcat:7.0.55"
// plugins for the compile step
compile ":scaffolding:2.1.2"
compile ':cache:1.1.7'
compile ":asset-pipeline:1.9.6"
compile ":vaadin:7.2.5"
// plugins needed at runtime but not for compilation
runtime ":hibernate4:4.3.5.5" // or ":hibernate:3.6.10.17"
runtime ":database-migration:1.4.0"
runtime ":jquery:1.11.1"
}

Answer 1

You should try upgrading to Vaadin 7.3.0.beta1 and see if it resolves the issue.
The problematic DeepCopy part which uses serialization/deserialization has been refactored away in the latest vaadin-sass-compiler version (on which 7.3.0 relies).
Alternatively, you can force a newer vaadin-sass-compiler version to be used with Vaadin 7.2.6.

Answer 2

This is a problem with the plugin itself or maybe within Vaadin. Thanks to #artur-signell 's comment, the actual workaround for now is to add a newer version of the SASS compiler in your BuildConfig.groovy:
dependencies {
// ...
compile 'com.vaadin:vaadin-sass-compiler:0.9.9'
}
Edit Grails 2.4.3 and Vaadin Plugin 7.3.0.1 work fork me directly