Spring Boot 和 Jersey 产生 ClassNotFound

Question

我正在尝试打包使用 Jersey 的 Spring Boot 应用程序。在开发过程中启动应用程序时运行没有问题，当我使用

生成 jar 文件时出现问题

mvnw package && java -jar target/gs-spring-boot-docker-0.1.0.jar

这会产生以下错误。

使用名称“org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration”创建 bean 时出错：不满足依赖 ency 通过构造函数参数 1 表示；嵌套异常是 org.springframework.beans.factory.BeanCreationException：创建名称为“jerseyConfig”的 bean 时出错 在 URL [jar:file:..path/Backend/target/celulascontentas-2.0.jar!/BOOT-INF/classes!/tech/aabo/celulascontenta 中定义 s/config/JerseyConfig.class]：bean 的实例化失败；嵌套异常是 org.springframework.beans.BeanInstantiationException：无法实例化 [tech.aabo.ce lulascontentas.config.JerseyConfig]：构造函数抛出异常；嵌套异常是 org.glassfish.jersey.server.internal.scanning.ResourceFinderException: java.io.File NotFoundException: ..path\Backend\target\celulascontentas-2.0.jar!\BOOT-INF\classes （系统找不到路径 指定）

我的 Jersey 配置如下所示：

package tech.aabo.celulascontentas.config;

import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.server.ServerProperties;
import org.springframework.stereotype.Component;

import javax.ws.rs.ApplicationPath;

@Component
@ApplicationPath("/api")
public class JerseyConfig extends ResourceConfig {

    public JerseyConfig() {
        register(JacksonJaxbJsonProvider.class);
        packages("tech.aabo.celulascontentas.endpoint");
        property(ServerProperties.BV_SEND_ERROR_IN_RESPONSE, true);
    }
}

我的 pom.xml 看起来像：

<?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>

    <groupId>tech.aabo</groupId>
    <artifactId>celulascontentas</artifactId>
    <version>2.0</version>
    <packaging>jar</packaging>

    <name>celulascontentas</name>
    <description>API para celulas contentas</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- Core -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>

        <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- DB -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- Extra -->

        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.9.3</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.7</version>
        </dependency>

        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk</artifactId>
            <version>1.11.133</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <artifactId>maven-resources-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-resources</id>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy-resources</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${basedir}/target/</outputDirectory>
                            <resources>
                                <resource>
                                    <directory>src/main/resources</directory>
                                    <filtering>true</filtering>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

我尝试了各种组合，但总是产生相同的错误。那些人现在如何解决它？

谢谢

Answer 1

Jersey classpath scanning limitations

对可执行 jar 布局的更改意味着限制 Jersey 的类路径扫描现在也会影响可执行的 jar 文件 作为可执行的战争文件。要解决此问题，您可以使用课程 希望被泽西岛扫描的应包装在罐子中并包含在内 作为 BOOT-INF/lib 中的依赖项。然后 Spring Boot 启动器应该 配置为在启动时解压这些 jar，以便 Jersey 可以扫描 他们的内容。

这是一个已知问题，有一个尚未合并的打开的pull 请求。我建议你参考这个issue，它提到了一些解决方法。

解决方法很少

1. 配置 Boot 的 Maven 插件以解压包含该插件的 jars 包

2. 使用以下解决方法

jersey 1:

import java.util.Map;

import javax.annotation.PostConstruct;
import javax.ws.rs.Path;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

import com.sun.jersey.api.core.DefaultResourceConfig;

@Component
public class RestApplication extends DefaultResourceConfig {

    private static final Logger log = LoggerFactory.getLogger(RestApplication.class);

    public RestApplication() {
        getFeatures().put("com.sun.jersey.api.json.POJOMappingFeature", true);
    }

    @Autowired
    ApplicationContext appCtx;

    @PostConstruct
    public void setup() {
        log.info("Rest classes found:");
        Map<String,Object> beans = appCtx.getBeansWithAnnotation(Path.class);
        for (Object o : beans.values()) {
            log.info(" -> " + o.getClass().getName());
            getSingletons().add(o);
        }
    }

}
and

    @Autowired
    RestApplication restApplication;

    @Bean
    public ServletRegistrationBean jersey() {
        ServletRegistrationBean bean = new ServletRegistrationBean();
        bean.setServlet(new ServletContainer(restApplication));
        bean.addInitParameter("com.sun.jersey.api.json.POJOMappingFeature", "true");
        bean.setUrlMappings(Arrays.asList("/rest/*"));
        return bean;
    }
jersery2:

import java.util.Map;

import javax.annotation.PostConstruct;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.Path;

import org.glassfish.jersey.server.ResourceConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;

import com.sun.jersey.api.core.ResourceConfig;

@Component
@ApplicationPath("/rest")
public class JerseyConfig extends ResourceConfig {

    private static final Logger log = LoggerFactory.getLogger(JerseyConfig.class);

    @Autowired
    ApplicationContext appCtx;

    @PostConstruct
    public void setup() {
        log.info("Rest classes found:");
        Map<String,Object> beans = appCtx.getBeansWithAnnotation(Path.class);
        for (Object o : beans.values()) {
            log.info(" -> " + o.getClass().getName());
            register(o);
        }
    }

}