Payara 5 上的 Spring-Boot Rest 控制器忽略 JAXB 注释

Question

我在使用 Spring-Boot 应用程序时遇到问题，我想将其部署到 Payara 5。我访问了Spring Initializr页面，我填写了组，工件并添加了Web依赖项。为了能够将应用程序部署到Payara，我删除了Tomcat的依赖项，并调整了@SpringBootApplication注释类，以扩展SpringBootServletInitializer。我创建了非常简单的 RestController 来返回非常简单的 Pojo。

这是代码：绒球.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.1.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.sample</groupId>
<artifactId>rest-payara</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>rest-glassfish</name>
<description>Demo project for Spring Boot</description>
<packaging>war</packaging>
<properties>
    <java.version>1.8</java.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>2.1.1.RELEASE</version>
        <exclusions>
            <exclusion>
                <artifactId>spring-boot-starter-tomcat</artifactId>
                <groupId>org.springframework.boot</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <artifactId>spring-boot-starter-tomcat</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.1.1.RELEASE</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <version>2.1.1.RELEASE</version>
        <scope>test</scope>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
</project>

应用类：

package com.sample.restpayara;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class RestPayaraApplication extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(RestPayaraApplication.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(RestPayaraApplication.class);
    }
}

其余控制器：

package com.sample.restpayara;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class RestApiController {
  @GetMapping(value = "/sample-pojo", produces = { MediaType.APPLICATION_JSON_VALUE, MediaType.APPLICATION_XML_VALUE })
  public SamplePojo getSamplePojo() {
    return new SamplePojo("Sample pojo");
  }
}

波乔：

package com.sample.restpayara;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "PojoRoot")
public class SamplePojo {
  @XmlElement(name = "pojoContent")
  private String content;
  public SamplePojo() {
  }
  public SamplePojo(String content) {
    this.content = content;
  }
  public String getContent() {
    return content;
  }
}

当我运行此应用程序时

mvn spring-boot:run

一切都像我想要的那样工作，CURL 请求：

curl -k -i -X GET "http://localhost:8080/sample-pojo" -H "accept: application/xml" -H "Content-Type: application/xml"

返回：

HTTP/1.1 200 
Content-Type: application/xml
Transfer-Encoding: chunked
Date: Fri, 28 Dec 2018 09:26:08 GMT
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><PojoRoot><pojoContent>Sample pojo</pojoContent></PojoRoot>

但是，当我将此代码部署到 Payara 并且我执行 CURL 请求时：

curl -k -i -X GET "https://my-payara-domain.local:8181/rest-payara-0.0.1-SNAPSHOT/sample-pojo" -H "accept: application/xml" -H "Content-Type: application/xml"

我收到回复：

HTTP/2 200 
content-type: application/xml;charset=UTF-8
<SamplePojo><content>Sample pojo</content></SamplePojo>

这就是问题所在 - 为什么 Payara 上忽略了 JAXB 注释，我必须做些什么才能使它们工作？

Answer 1

对于任何曾经遇到过类似问题的人来说 - 问题的根本原因与这样一个事实有关，即MappingJackson2HttpMessageConverter正在启动Payara 5，而Jaxb2RootElementHttpMessageConverter却不在那里。我通过提供配置找到了解决问题的方法：

package com.sample.restpayara;
import java.util.List;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
@Configuration
public class JaxbSupportConfiguration extends WebMvcConfigurationSupport {
  @Override
  public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
    converters.add(new Jaxb2RootElementHttpMessageConverter());
    converters.add(new MappingJackson2HttpMessageConverter());
  }
}

希望它在未来对某人有所帮助，对我来说，花了 1,5 天才弄清楚;(

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==================================

更新：第一个解决方案确实打开了Web MVC，并导致静态文件不再提供。我设法通过提供配置找到了最终解决方案：

package com.sample.restpayara;
import java.util.Arrays;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter;
@SpringBootApplication
public class RestPayaraApplication extends SpringBootServletInitializer {
    public static void main(String[] args) {
        SpringApplication.run(RestPayaraApplication.class, args);
    }
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(RestPayaraApplication.class);
    }
    @Bean
    public HttpMessageConverters converters() {
        return new HttpMessageConverters(true, Arrays.asList(
                new MappingJackson2HttpMessageConverter(),
                new Jaxb2RootElementHttpMessageConverter())
        );
    }
}