java - 部署到Docker后，应用程序未创建类

Question

我有一些部署到docker的应用程序。在本地运行时，这些应用程序运行正常，但是，在部署到docker之后，我在其中一个应用程序中遇到以下错误:

Jan 05, 2020 3:26:58 PM com.sun.xml.internal.ws.server.sei.TieHandler createResponse
SEVERE: javax/persistence/Persistence
java.lang.NoClassDefFoundError: javax/persistence/Persistence
    at com.project.doctor.repository.JPAUtil.getEntityManagerFactory(JPAUtil.java:12)
    at com.project.doctor.repository.ActivityRepository.findAllActivitiesByPatientId(ActivityRepository.java:13)
    at com.project.doctor.service.DoctorServiceImpl.getActivitiesForChart(DoctorServiceImpl.java:43)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.sun.xml.internal.ws.api.server.MethodUtil.invoke(MethodUtil.java:68)
    at com.sun.xml.internal.ws.api.server.InstanceResolver$1.invoke(InstanceResolver.java:235)
    at com.sun.xml.internal.ws.server.InvokerTube$2.invoke(InvokerTube.java:134)
    at com.sun.xml.internal.ws.server.sei.SEIInvokerTube.processRequest(SEIInvokerTube.java:73)
    at com.sun.xml.internal.ws.api.pipe.Fiber.__doRun(Fiber.java:1121)
    at com.sun.xml.internal.ws.api.pipe.Fiber._doRun(Fiber.java:1035)
    at com.sun.xml.internal.ws.api.pipe.Fiber.doRun(Fiber.java:1004)
    at com.sun.xml.internal.ws.api.pipe.Fiber.runSync(Fiber.java:862)
    at com.sun.xml.internal.ws.server.WSEndpointImpl$2.process(WSEndpointImpl.java:404)
    at com.sun.xml.internal.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:706)
    at com.sun.xml.internal.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:260)
    at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handleExchange(WSHttpHandler.java:98)
    at com.sun.xml.internal.ws.transport.http.server.WSHttpHandler.handle(WSHttpHandler.java:82)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
    at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:82)
    at sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:675)
    at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
    at sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:647)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: javax.persistence.Persistence
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 39 more

我的pom.xml的内容如下:

<?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>doctor</groupId>
    <artifactId>app</artifactId>
    <version>1.0-SNAPSHOT</version>
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
            <plugin>
                <!-- Build an executable JAR -->
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.1.0</version>
                <configuration>
                    <includes>
                        <include>**/*.class</include>
                        <include>**/*.properties</include>
                        <include>**/*.xml</include>
                    </includes>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                            <classpathPrefix>lib/</classpathPrefix>
                            <mainClass>com.project.doctor.DoctorPublisher</mainClass>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/javax.xml.ws/jaxws-api -->
        <dependency>
            <groupId>javax.xml.ws</groupId>
            <artifactId>jaxws-api</artifactId>
            <version>2.2.6</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.ws</groupId>
            <artifactId>rt</artifactId>
            <version>2.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.4.1.Final</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.4.1.Final</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/javax/javaee-api -->
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>
</project>

这是JPAUtil类的内容:

package com.project.doctor.repository;

import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JPAUtil {
    private static final String PERSISTENCE_UNIT_NAME = "persistanceUnit";
    private static EntityManagerFactory factory;

    public static EntityManagerFactory getEntityManagerFactory() {
        if (factory == null) {
            factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
        }
        return factory;
    }

    public static void shutdown() {
        if (factory != null) {
            factory.close();
        }
    }
}

为了将此应用程序部署到docker，我使用了使用 mvn clean install生成的jar。您能帮我解决这个问题吗？

Answer 1

使用clean-install创建的jar仅包含您的代码，并且可以在本地工作，因为在IDE中您可以使用所有依赖项。
为了在Docker上进行部署，您需要创建一个Uber-jar，其中包含应用程序所需的所有依赖项(JAR文件)。

一种选择是使用Maven Shade插件，这是我的项目中的示例:

<plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.2.1</version>

            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>
                                    com.perosa.bello.BalancerApp
                                </mainClass>
                            </transformer>
                        </transformers>
                        <createDependencyReducedPom>
                            false
                        </createDependencyReducedPom>
                    </configuration>

                </execution>

            </executions>

        </plugin>

您还可以构建一个Spring Boot应用程序(使用Spring Boot Maven插件)，该应用程序还将为您打包所有依赖项。

祝好运，
贝贝