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。

创建名为 'org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration' 的 bean 时出错：通过构造函数参数 1 表示不满足的依赖关系；嵌套异常是 org.springframework.beans.factory.BeanCreationException：在 URL [jar:file:..path/Backend/target/celulascontentas-2.0.jar!/BOOT-INF/classes! 中定义名称为“jerseyConfig”的 bean 创建时出错！ /tech/aabo/celulascontenta s/config/JerseyConfig.class]：bean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！

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，但它总是产生相同的错误。那些人现在如何修复它？

谢谢

Answer 1

Jersey 类路径扫描限制

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可执行 jar 布局的更改意味着\nJersey\xe2\x80\x99s 类路径扫描的限制现在也会影响可执行 jar 文件以及可执行 war 文件。要解决此问题，您希望 Jersey 扫描的类应该打包在 jar 中，并作为依赖项包含在 BOOT-INF/lib 中。然后，应将 Spring Boot 启动器配置为在启动时解压这些 jar，以便 Jersey 可以扫描其内容。

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这是一个已知问题，并且有一个尚未合并的开放拉取请求。我建议您参考此问题，其中提到了一些解决方法。

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解决方法很少

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1. 配置 Boot 的 Maven 插件以解压包含该包的 jar\n

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2. 使用以下解决方法

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jersey 1:\n\nimport java.util.Map;\n\nimport javax.annotation.PostConstruct;\nimport javax.ws.rs.Path;\n\nimport org.slf4j.Logger;\nimport org.slf4j.LoggerFactory;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.context.ApplicationContext;\nimport org.springframework.stereotype.Component;\n\nimport com.sun.jersey.api.core.DefaultResourceConfig;\n\n@Component\npublic class RestApplication extends DefaultResourceConfig {\n\n    private static final Logger log = LoggerFactory.getLogger(RestApplication.class);\n\n    public RestApplication() {\n        getFeatures().put("com.sun.jersey.api.json.POJOMappingFeature", true);\n    }\n\n    @Autowired\n    ApplicationContext appCtx;\n\n    @PostConstruct\n    public void setup() {\n        log.info("Rest classes found:");\n        Map<String,Object> beans = appCtx.getBeansWithAnnotation(Path.class);\n        for (Object o : beans.values()) {\n            log.info(" -> " + o.getClass().getName());\n            getSingletons().add(o);\n        }\n    }\n\n}\nand\n\n    @Autowired\n    RestApplication restApplication;\n\n    @Bean\n    public ServletRegistrationBean jersey() {\n        ServletRegistrationBean bean = new ServletRegistrationBean();\n        bean.setServlet(new ServletContainer(restApplication));\n        bean.addInitParameter("com.sun.jersey.api.json.POJOMappingFeature", "true");\n        bean.setUrlMappings(Arrays.asList("/rest/*"));\n        return bean;\n    }\njersery2:\n\nimport java.util.Map;\n\nimport javax.annotation.PostConstruct;\nimport javax.ws.rs.ApplicationPath;\nimport javax.ws.rs.Path;\n\nimport org.glassfish.jersey.server.ResourceConfig;\nimport org.slf4j.Logger;\nimport org.slf4j.LoggerFactory;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.context.ApplicationContext;\nimport org.springframework.stereotype.Component;\n\nimport com.sun.jersey.api.core.ResourceConfig;\n\n@Component\n@ApplicationPath("/rest")\npublic class JerseyConfig extends ResourceConfig {\n\n    private static final Logger log = LoggerFactory.getLogger(JerseyConfig.class);\n\n    @Autowired\n    ApplicationContext appCtx;\n\n    @PostConstruct\n    public void setup() {\n        log.info("Rest classes found:");\n        Map<String,Object> beans = appCtx.getBeansWithAnnotation(Path.class);\n        for (Object o : beans.values()) {\n            log.info(" -> " + o.getClass().getName());\n            register(o);\n        }\n    }\n\n}\n

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