/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.wicketTutorial.commons.bootstrap;

import org.apache.wicket.Application;

import de.agilecoders.wicket.core.Bootstrap;
import de.agilecoders.wicket.core.settings.BootstrapSettings;
import de.agilecoders.wicket.core.settings.IBootstrapSettings;
import de.agilecoders.wicket.core.settings.ThemeProvider;
import de.agilecoders.wicket.themes.markup.html.bootswatch.BootswatchTheme;
import de.agilecoders.wicket.themes.markup.html.bootswatch.BootswatchThemeProvider;

public class BootstrapInitializer
{

	public static void init(Application application)
	{
		final IBootstrapSettings settings = new BootstrapSettings();
        final ThemeProvider themeProvider = new BootswatchThemeProvider(BootswatchTheme.United);

        settings.setThemeProvider(themeProvider);
        settings.setDeferJavascript(true);
        
        Bootstrap.install(application, settings);
	}

}

/**
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.wicketTutorial.commons.bootstrap;

import org.apache.wicket.Application;
import org.apache.wicket.resource.JQueryResourceReference;

import de.agilecoders.wicket.core.Bootstrap;
import de.agilecoders.wicket.core.settings.BootstrapSettings;
import de.agilecoders.wicket.core.settings.IBootstrapSettings;
import de.agilecoders.wicket.core.settings.ThemeProvider;
import de.agilecoders.wicket.themes.markup.html.bootswatch.BootswatchTheme;
import de.agilecoders.wicket.themes.markup.html.bootswatch.BootswatchThemeProvider;

public class BootstrapInitializer {

    public static void init(Application application) {

        final IBootstrapSettings settings = new BootstrapSettings();
        final ThemeProvider themeProvider = new BootswatchThemeProvider(BootswatchTheme.United);

        settings.setThemeProvider(themeProvider);
        settings.setDeferJavascript(true);

        application.getJavaScriptLibrarySettings().setJQueryReference(JQueryResourceReference.INSTANCE_2);
        Bootstrap.install(application, settings);
    }

}

Downgrade to JQuery 2