Eager load Tapestry5 services on startup

AppModule.java

    public void contributeApplicationInitializer(OrderedConfiguration<ApplicationInitializerFilter> configuration,
            @Symbol(TapestryEagerLoadInitializer.FORCE_EAGER_LOAD) boolean forceEagerLoad)
    {
        if (forceEagerLoad)
        {
            configuration.addInstance("EagerLoad", TapestryEagerLoadInitializer.class, "before:*");
        }
    }

TapestryEagerLoadInitializer.java

package com.anjlab.tapestry5.services;

import java.lang.reflect.Field;
import java.util.List;
import java.util.Locale;
import java.util.Set;

import javax.servlet.ServletContext;

import org.apache.tapestry5.TapestryFilter;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.ioc.def.ServiceDef2;
import org.apache.tapestry5.ioc.internal.RegistryImpl;
import org.apache.tapestry5.ioc.internal.RegistryWrapper;
import org.apache.tapestry5.ioc.internal.ServiceDefImpl;
import org.apache.tapestry5.services.ApplicationGlobals;
import org.apache.tapestry5.services.ApplicationInitializer;
import org.apache.tapestry5.services.ApplicationInitializerFilter;
import org.apache.tapestry5.services.Context;
import org.apache.tapestry5.services.Request;
import org.apache.tapestry5.services.RequestGlobals;
import org.apache.tapestry5.services.Session;

public class TapestryEagerLoadInitializer implements ApplicationInitializerFilter
{
    public static final String FORCE_EAGER_LOAD = "tapestry.force-eager-load";

    @Inject private ApplicationGlobals applicationGlobals;
    
    @Override
    public void initializeApplication(Context context, ApplicationInitializer initializer)
    {
        RegistryWrapper wrapper = (RegistryWrapper) context.getAttribute(TapestryFilter.REGISTRY_CONTEXT_NAME);
        
        try
        {
            RegistryImpl registryImpl = getFieldValue(wrapper, "registry");
            
            RequestGlobals requestGlobals = registryImpl.getService(RequestGlobals.class);
            requestGlobals.storeRequestResponse(new RequestForEagerLoad(applicationGlobals.getServletContext()), null);
            
            Set<ServiceDef2> allServiceDefs = getFieldValue(registryImpl, "allServiceDefs");
            
            for (ServiceDef2 serviceDef2 : allServiceDefs)
            {
                if (serviceDef2 instanceof ServiceDefImpl)
                {
                    setFieldValue(serviceDef2, "eagerLoad", true);
                }
            }
            
            initializer.initializeApplication(context);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    protected void setFieldValue(Object object, String fieldName, Object value)
            throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException
    {
        Field field = object.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(object, value);
        field.setAccessible(false);
    }

    @SuppressWarnings("unchecked")
    protected <T> T getFieldValue(Object object, String fieldName)
            throws NoSuchFieldException, IllegalAccessException
    {
        Field field = object.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        Object value = field.get(object);
        field.setAccessible(false);
        return (T) value;
    }

    public static class RequestForEagerLoad implements Request
    {
        private final ServletContext context;

        public RequestForEagerLoad(ServletContext context)
        {
            this.context = context;
        }

        @Override
        public void setAttribute(String name, Object value)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isXHR()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isSecure()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public boolean isRequestedSessionIdValid()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public Session getSession(boolean create)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public int getServerPort()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getServerName()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getRemoteHost()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getPath()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String[] getParameters(String name)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public List<String> getParameterNames()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getParameter(String name)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getMethod()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public Locale getLocale()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public int getLocalPort()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public List<String> getHeaderNames()
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getHeader(String name)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public long getDateHeader(String name)
        {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getContextPath()
        {
            return context.getContextPath();
        }

        @Override
        public Object getAttribute(String name)
        {
            throw new UnsupportedOperationException();
        }
    }

}