Add support for Thymeleaf 3 while keeping Thymeleaf 2 as the default

Closes gh-4393

spring-boot-samples/spring-boot-sample-web-thymeleaf3/src/main/java/sample/web/thymeleaf3/InMemoryMessageRepository.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed 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 sample.web.thymeleaf3;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicLong;
+
+/**
+ * @author Dave Syer
+ */
+public class InMemoryMessageRepository implements MessageRepository {
+
+	private static AtomicLong counter = new AtomicLong();
+
+	private final ConcurrentMap<Long, Message> messages = new ConcurrentHashMap<Long, Message>();
+
+	@Override
+	public Iterable<Message> findAll() {
+		return this.messages.values();
+	}
+
+	@Override
+	public Message save(Message message) {
+		Long id = message.getId();
+		if (id == null) {
+			id = counter.incrementAndGet();
+			message.setId(id);
+		}
+		this.messages.put(id, message);
+		return message;
+	}
+
+	@Override
+	public Message findMessage(Long id) {
+		return this.messages.get(id);
+	}
+
+	@Override
+	public void deleteMessage(Long id) {
+		this.messages.remove(id);
+	}
+
+}

spring-boot-samples/spring-boot-sample-web-thymeleaf3/src/main/java/sample/web/thymeleaf3/Message.java

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+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed 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 sample.web.thymeleaf3;
+
+import java.util.Calendar;
+
+import org.hibernate.validator.constraints.NotEmpty;
+
+/**
+ * @author Rob Winch
+ */
+public class Message {
+
+	private Long id;
+
+	@NotEmpty(message = "Message is required.")
+	private String text;
+
+	@NotEmpty(message = "Summary is required.")
+	private String summary;
+
+	private Calendar created = Calendar.getInstance();
+
+	public Long getId() {
+		return this.id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public Calendar getCreated() {
+		return this.created;
+	}
+
+	public void setCreated(Calendar created) {
+		this.created = created;
+	}
+
+	public String getText() {
+		return this.text;
+	}
+
+	public void setText(String text) {
+		this.text = text;
+	}
+
+	public String getSummary() {
+		return this.summary;
+	}
+
+	public void setSummary(String summary) {
+		this.summary = summary;
+	}
+}

spring-boot-samples/spring-boot-sample-web-thymeleaf3/src/main/java/sample/web/thymeleaf3/MessageRepository.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed 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 sample.web.thymeleaf3;
+
+/**
+ * @author Rob Winch
+ */
+public interface MessageRepository {
+
+	Iterable<Message> findAll();
+
+	Message save(Message message);
+
+	Message findMessage(Long id);
+
+	void deleteMessage(Long id);
+
+}

spring-boot-samples/spring-boot-sample-web-thymeleaf3/src/main/java/sample/web/thymeleaf3/SampleWebThymeleaf3Application.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed 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 sample.web.thymeleaf3;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.convert.converter.Converter;
+
+@SpringBootApplication
+public class SampleWebThymeleaf3Application {
+
+	@Bean
+	public MessageRepository messageRepository() {
+		return new InMemoryMessageRepository();
+	}
+
+	@Bean
+	public Converter<String, Message> messageConverter() {
+		return new Converter<String, Message>() {
+			@Override
+			public Message convert(String id) {
+				return messageRepository().findMessage(Long.valueOf(id));
+			}
+		};
+	}
+
+	public static void main(String[] args) throws Exception {
+		SpringApplication.run(SampleWebThymeleaf3Application.class, args);
+	}
+
+}

spring-boot-samples/spring-boot-sample-web-thymeleaf3/src/main/java/sample/web/thymeleaf3/mvc/MessageController.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed 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 sample.web.thymeleaf3.mvc;
+
+import javax.validation.Valid;
+
+import sample.web.thymeleaf3.Message;
+import sample.web.thymeleaf3.MessageRepository;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.servlet.ModelAndView;
+import org.springframework.web.servlet.mvc.support.RedirectAttributes;
+
+/**
+ * @author Rob Winch
+ * @author Doo-Hwan Kwak
+ */
+@Controller
+@RequestMapping("/")
+public class MessageController {
+
+	private final MessageRepository messageRepository;
+
+	public MessageController(MessageRepository messageRepository) {
+		this.messageRepository = messageRepository;
+	}
+
+	@GetMapping
+	public ModelAndView list() {
+		Iterable<Message> messages = this.messageRepository.findAll();
+		return new ModelAndView("messages/list", "messages", messages);
+	}
+
+	@GetMapping("{id}")
+	public ModelAndView view(@PathVariable("id") Message message) {
+		return new ModelAndView("messages/view", "message", message);
+	}
+
+	@GetMapping(params = "form")
+	public String createForm(@ModelAttribute Message message) {
+		return "messages/form";
+	}
+
+	@PostMapping
+	public ModelAndView create(@Valid Message message, BindingResult result,
+			RedirectAttributes redirect) {
+		if (result.hasErrors()) {
+			return new ModelAndView("messages/form", "formErrors", result.getAllErrors());
+		}
+		message = this.messageRepository.save(message);
+		redirect.addFlashAttribute("globalMessage", "Successfully created a new message");
+		return new ModelAndView("redirect:/{message.id}", "message.id", message.getId());
+	}
+
+	@RequestMapping("foo")
+	public String foo() {
+		throw new RuntimeException("Expected exception in controller");
+	}
+
+	@GetMapping(value = "delete/{id}")
+	public ModelAndView delete(@PathVariable("id") Long id) {
+		this.messageRepository.deleteMessage(id);
+		Iterable<Message> messages = this.messageRepository.findAll();
+		return new ModelAndView("messages/list", "messages", messages);
+	}
+
+	@GetMapping(value = "modify/{id}")
+	public ModelAndView modifyForm(@PathVariable("id") Message message) {
+		return new ModelAndView("messages/form", "message", message);
+	}
+
+}