[JSF2] Warning message during redeploy

[Bupjae Lee]

I got WEB0517 during redeploy my web applcation
Description of WEB0517 follows here:

WEB0517 Unable to restore sessions for web module [{0}] from previous deployment

Cause:
An HTTP session that was supposed to survive the redeployment of the web module failed to be restored (deserialized). This can happen if an application class that was used as a session attribute has changed incompatibly

Solution:
Make sure that any application classes that are being used as session attributes change only in a compatible way during redeployments

However, this warning invokes even if I didn't modified any of the session-scoped bean
Moreover, the exception should be 'InvalidClassException', not 'NullPointerException' if I changed the session-scoped bean incompatible way.

I use Glassfish v3 and bundled JSF library.

Server log follows here:

Warning: WEB0517: Unable to restore sessions for web module [/Bams-web] from previous deployment
java.lang.NullPointerException
        at org.jboss.weld.introspector.ForwardingAnnotated.isAnnotationPresent(ForwardingAnnotated.java:50)
        at org.jboss.weld.injection.FieldInjectionPoint.<init>(FieldInjectionPoint.java:62)
        at org.jboss.weld.injection.FieldInjectionPoint.of(FieldInjectionPoint.java:55)
        at org.jboss.weld.injection.FieldInjectionPoint$SerializationProxy.readResolve(FieldInjectionPoint.java:169)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1061)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1762)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at java.util.ArrayList.readObject(ArrayList.java:593)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at org.apache.catalina.session.StandardSession.readRemainingObject(StandardSession.java:1818)
        at org.apache.catalina.session.StandardSession.readObject(StandardSession.java:1750)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at org.apache.catalina.session.StandardSession.deserialize(StandardSession.java:1063)
        at org.apache.catalina.session.StandardManager.readSessions(StandardManager.java:511)
        at com.sun.enterprise.web.WebModule.loadSessions(WebModule.java:1557)
        at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1935)
        at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1605)
        at com.sun.enterprise.web.WebApplication.start(WebApplication.java:90)
        at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126)
        at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241)
        at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236)
        at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339)
        at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
        at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:310)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1121)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224)
        at org.glassfish.deployment.admin.ReDeployCommand.execute(ReDeployCommand.java:96)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
        at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224)
        at com.sun.enterprise.v3.admin.AdminAdapter.doCommand(AdminAdapter.java:365)
        at com.sun.enterprise.v3.admin.AdminAdapter.service(AdminAdapter.java:204)
        at com.sun.grizzly.tcp.http11.GrizzlyAdapter.service(GrizzlyAdapter.java:166)
        at com.sun.enterprise.v3.server.HK2Dispatcher.dispath(HK2Dispatcher.java:100)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:245)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)

[Tim Holloway]

Your exception occurred in JBoss Weld, so you'd probably be better off asking in a JBoss forum.

Platform-specific considerations aside, one problem that often occurs when restoring sessions comes from when a Session object incorporates a non-serialiable object. For example, if I was foolish enough to attempt to store a JDBC Connection in a backing bean.

[Bupjae Lee]

Thanks for reply.

First, I'm not using JBoss; I'm using Glassfish v3, and it seems that there are no Glassfish forum

Since I'm using JSF, I checked all of @SessionScoped bean classes' fields, and it doesn't seem I have non-serializable object

@ManagedBean(name = "Scheduler")
@SessionScoped
public class SchedulerBean implements Serializable {

    private static final long serialVersionUID = -23948329482394L;
    private Set<ScheduleEvent> scheduledEvents; // Actual content is HashSet<ScheduleEvent>

    // Constructors and methods are omitted
}

@ManagedBean(name = "Calendar")
@SessionScoped
public class CalendarBean implements Serializable {

    private static final long serialVersionUID = 23899112938102938L;
    private static final Integer[] DAY_OF_WEEK_LIST = {
        Calendar.SUNDAY,
        Calendar.MONDAY,
        Calendar.TUESDAY,
        Calendar.WEDNESDAY,
        Calendar.THURSDAY,
        Calendar.FRIDAY,
        Calendar.SATURDAY
    };
    private Calendar currentMonth;

    // Constructors and methods are omitted
}

public class ScheduleEvent implements Serializable {

    private static final long serialVersionUID = 23084747293874892L;
    private EventType eventType;
    private Date date;
    private String place;
    private String desc;

    public enum EventType {

        KAIST_SCHEDULE, KAIST_CULTURE, MOVIE;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (!(obj instanceof ScheduleEvent)) {
            return false;
        }
        ScheduleEvent that = (ScheduleEvent) obj;
        return eventType == that.eventType && date.equals(that.date) && place.equals(that.place) && desc.equals(that.desc);
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 79 * hash + (this.eventType != null ? this.eventType.hashCode() : 0);
        hash = 79 * hash + (this.date != null ? this.date.hashCode() : 0);
        hash = 79 * hash + (this.place != null ? this.place.hashCode() : 0);
        hash = 79 * hash + (this.desc != null ? this.desc.hashCode() : 0);
        return hash;
    }

    // Constructors and other methods are omitted
}