Exception when combining Omnifaces and PrimeFaces LazyDataModel on Payara Micro

Question

I run into an Exception when adding the OmniFaces maven dependency to an existing working Project:

[2016-06-28T17:19:09.280+0200] [Payara Micro 4.1] [SEVERE] [AS-WEB-CORE-00037] [javax.enterprise.web.core] [tid: _ThreadID=17 _ThreadName=http-listener(7)] [timeMillis: 1467127149280] [levelValue: 1000] [[An exception or error occurred in the container during the request processing
java.lang.ClassCastException: cannot assign instance of java.lang.String to field org.primefaces.model.LazyDataModel.data of type java.util.List in instance of org.primefaces.showcase.view.data.datatable.LazyCarDataModel
    at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2083)
    at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1261)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1995)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1913)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1989)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1913)    
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at java.util.HashMap.readObject(HashMap.java:1155)
    at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at java.util.HashMap.readObject(HashMap.java:1155)
    at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1989)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1913)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at org.apache.catalina.session.StandardSession.readRemainingObject(StandardSession.java:2079)
    at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1987)
    at sun.reflect.GeneratedMethodAccessor49.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at org.apache.catalina.session.StandardSession.deserialize(StandardSession.java:1274)
    at org.apache.catalina.session.StoreBase.readSession(StoreBase.java:296)
    at org.glassfish.web.ha.session.management.ReplicationStore.getSession(ReplicationStore.java:567)
    at org.glassfish.web.ha.session.management.ReplicationStore.getSession(ReplicationStore.java:519)
    at org.glassfish.web.ha.session.management.ReplicationStore.loadFromBackingStore(ReplicationStore.java:433)
    at org.glassfish.web.ha.session.management.ReplicationStore.load(ReplicationStore.java:416)
    at org.apache.catalina.session.PersistentManagerBase.doSwapIn(PersistentManagerBase.java:1215)
    at org.apache.catalina.session.PersistentManagerBase.swapIn(PersistentManagerBase.java:1175)
    at org.glassfish.web.ha.session.management.ReplicationManagerBase.findSession(ReplicationManagerBase.java:161)
    at org.apache.catalina.connector.Request.isRequestedSessionIdValid(Request.java:2996)
    at org.apache.catalina.connector.Request.parseSessionCookiesId(Request.java:4113)
    at org.apache.catalina.connector.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:672)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:354)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:526)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:724)
]]

I can reproduce the Exception with the PrimeFaces 6.0 Showcase, so it looks like the cause is not within my code.

This is how to reproduce with PrimeFaces showcase:

1. Download PrimeFaces 6.0 showcase sources from github.

2. Add an OnmiFaces dependency to pom.xml:

   <dependency>
       <groupId>org.omnifaces</groupId>
       <artifactId>omnifaces</artifactId>
       <version>2.3</version>
   </dependency>
   

3. Add the Maven code for Payara Micro Uber Jar creation from http://blog.payara.fish/creating-uber-jar-with-payara-micro to pom.xml

4. Build with mvn package and then start with java -jar showcase-6.0.jar

5. Now start the showcase on localhost and open the DataTable Lazy Loading example and you should get the exception.

The exeption does not occur, when the OmniFaces dependency is removed. And it does not occur on Payara Application Server, but only on Payara Micro.

So I'm not sure if the error is in OmniFaces, Payara Micro, PrimeFaces or wherever.

Answer 1

This behavior is caused by <distributable> flag which was added to OmniFaces 2.1 in order to support running on a cluster.

This has in turn uncovered some bugs in PrimeFaces 6.0, PrimeFaces showcase application and Payara Micro.

• PrimeFaces 6.0 new PhaseInfo class implements Serializable, but has a PhaseId property which isn't Serializable at all.
• In PrimeFaces showcase there are several Serializable view scoped beans having a non-serializable service property such as CarService in LazyView backing bean behind the lazy data table demo page.
• Payara Micro seems to not consider WAR's own web.xml whether it has <distributable> flag set. If this flag is not set, then the container should not assume the WAR as distributable.

The very same serialization problems with PrimeFaces 6.0 and PrimeFaces showcase are reproducible when you remove OmniFaces altogether, but set the <distributable> flag in web.xml of PrimeFaces showcase. Each of those issues need to reported individually. I have at least reported the PhaseInfo matter as issue 1570 and posted a comment on your Payara Micro issue.

On a slightly related note, I also noticed that PrimeFaces showcase's web.xml has set Mojarra-specific com.sun.faces.serializeServerState to false. I have not investigated the effects when set back to true, but this setting of false is not recommended as it may hide other bugs related to view building and state management.