java.io.NotSerializableException is thrown while restarting Vaadin application

When I restart my Tomcat, I get the following error:

2014;10;01; 15;49;47;055; WARN; com.vaadin.event.ListenerMethod;[localhost-startStop-2]; Error in serialization of the application: Class com.aaa.bbb.MyServlet$1 must implement serialization. 2014;10;01; 15;49;47;055; WARN; org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/my-vaadin];[localhost-startStop-2]; Cannot serialize session attribute com.vaadin.server.VaadinSession.MyServlet for session ... java.io.NotSerializableException: org.apache.catalina.loader.WebappClassLoader at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[na:1.6.0_31] at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source) ~[na:1.6.0_31] at com.vaadin.event.ListenerMethod.writeObject(ListenerMethod.java:88) ~[vaadin-server-7.2.7.jar:7.2.7] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_31] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.6.0_31] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.6.0_31] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.6.0_31] ...

Answer1:

The warning says that an anonymous inner class (within MyServlet class) must implement serialization. My servlet class contains only one anonymous inner class and it implements Serializable and have a serialVersionUID:

public class MyServlet extends VaadinServlet implements SessionInitListener { //... @Override public void sessionInit(SessionInitEvent event) throws ServiceException { event.getSession().addBootstrapListener(new BootstrapListener() { private static final long serialVersionUID = 1L; @Override public void modifyBootstrapPage(BootstrapPageResponse response) { //... } @Override public void modifyBootstrapFragment(BootstrapFragmentResponse response) { //... } }); } }

After a little research I found the solution: NotSerializableException on anonymous class So we have to change the anonymous inner class to a static nested class:

public class MyServlet extends VaadinServlet implements SessionInitListener { //... @Override public void sessionInit(SessionInitEvent event) throws ServiceException { event.getSession().addBootstrapListener(new MyBootstrapListener()); } private static class MyBootstrapListener implements BootstrapListener { private static final long serialVersionUID = 1L; @Override public void modifyBootstrapPage(BootstrapPageResponse response) { //... } @Override public void modifyBootstrapFragment(BootstrapFragmentResponse response) { //... } }); }

Or if we don't want multiple objects after deserialization:

public class MyServlet extends VaadinServlet implements SessionInitListener { //... @Override public void sessionInit(SessionInitEvent event) throws ServiceException { event.getSession().addBootstrapListener(MyBootstrapListener.INSTANCE); } private static class MyBootstrapListener implements BootstrapListener { private static final long serialVersionUID = 1L; private static final MyBootstrapListener INSTANCE = new MyBootstrapListener(); @Override public void modifyBootstrapPage(BootstrapPageResponse response) { //... } @Override public void modifyBootstrapFragment(BootstrapFragmentResponse response) { //... } private Object readResolve() { return INSTANCE; } }); }

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