使用maven阴影重新定位软件包时，AmazonEc2Client出现运行时错误

Question

我正在使用Java代理，并使用maven shade插件来重新定位我的依赖项，因此避免了类路径冲突和问题。到目前为止，我还不十分熟悉shade插件，但是我遇到了这个问题，我已经告诉了该插件对我的依赖项进行着色，并在所有内容前都添加shaded（例如com.amazonaws.services.ec2-> shaded .amazonaws.services.ec2），但是，当我运行构建AmazonEc2Client的应用程序时，出现以下错误：

Caused by: shaded.com.amazonaws.AmazonClientException: Unable to instantiate request handler chain for client: com.amazonaws.services.ec2.model.transform.EC2RequestHandler
    at shaded.com.amazonaws.handlers.HandlerChainFactory.createRequestHandlerChain(HandlerChainFactory.java:158)
    at shaded.com.amazonaws.handlers.HandlerChainFactory.newRequestHandlerChain(HandlerChainFactory.java:45)
    at shaded.com.amazonaws.services.ec2.AmazonEC2Client.init(AmazonEC2Client.java:308)
    at shaded.com.amazonaws.services.ec2.AmazonEC2Client.<init>(AmazonEC2Client.java:297)
    at shaded.com.amazonaws.services.ec2.AmazonEC2Client.<init>(AmazonEC2Client.java:280)
    at shaded.com.amazonaws.services.ec2.AmazonEC2ClientBuilder.build(AmazonEC2ClientBuilder.java:61)
    at shaded.com.amazonaws.services.ec2.AmazonEC2ClientBuilder.build(AmazonEC2ClientBuilder.java:27)
    at shaded.com.amazonaws.client.builder.AwsSyncClientBuilder.build(AwsSyncClientBuilder.java:46)
    at my.sample.project.Boot.<clinit>(Boot.java:49)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: com.amazonaws.services.ec2.model.transform.EC2RequestHandler
    at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at shaded.com.amazonaws.util.ClassLoaderHelper.loadClass(ClassLoaderHelper.java:177)
    at shaded.com.amazonaws.util.ClassLoaderHelper.loadClass(ClassLoaderHelper.java:136)
    at shaded.com.amazonaws.handlers.HandlerChainF

这是我的pom.xml的摘录

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-shade-plugin</artifactId>
    <version>3.0.0</version>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>shade</goal>
            </goals>
            <configuration>
                <transformers>
                    <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                        <manifestEntries>
                            <Premain-Class>my.sample.project.Boot</Premain-Class>
                        </manifestEntries>
                    </transformer>
                </transformers>
                <relocations>
                    <relocation>
                        <pattern>com.amazonaws</pattern>
                        <shadedPattern>shaded.com.amazonaws</shadedPattern>
                    </relocation>
                    <artifactSet>
                        <includes>
                            <include>*:*</include>
                        </includes>
                    </artifactSet>
            </configuration>
       </execution>
    </executions>
</plugin>

这是实例化EC2客户端的代码块的片段。

public static void premain(final String agentArgs, Instrumentation instrumentation) {
        log.info("Connecting to AWS...");
        ClientConfiguration clientConfiguration = new ClientConfiguration();
        clientConfiguration.withRetryPolicy(new RetryPolicy(DEFAULT_RETRY_CONDITION,
                                                            new PredefinedBackoffStrategies.ExponentialBackoffStrategy(500, 8000),
                                                            DEFAULT_MAX_ERROR_RETRY,
                                                            true));
        AwsRequests.client = AmazonEC2Client.builder()
                                            .withClientConfiguration(clientConfiguration)
                                            .build();
    }

该问题源于实际构建amazonec2client的时间，看起来它仍然希望在com.amazonaws.services.ec2程序包中找到该类，但已将其阴影化到shaded.com.amazonaws.services.ec2程序包中。我的理解是，shade插件会更新基础代码以指向正确的阴影包，我是否缺少某些东西？

感谢您的任何帮助，谢谢！

Answer 1

我能够找出问题，AmazonEC2client的init方法期望以下资源可用：