java - aws lambda 找不到 Gson 类

Question

我正在尝试 AWS Lambda，并尝试使用 JSON 消息引发异常，因此我使用 Gson 库来构建 JSON。

问题在于，当在AWS Lambda中运行它时，它找不到库的Gson类。在本地，它可以正常工作。

这是 AWS Lambda 抛出的错误:

"errorMessage": "com/google/gson/Gson",
"errorType": "java.lang.NoClassDefFoundError",

这是代码:

public class LambdaExecutor {

    public void handler(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
        LambdaExceptionHandler lambdaExceptionHandler = new LambdaExceptionHandler();
        lambdaExceptionHandler.setId("134");
        lambdaExceptionHandler.setErrorType("Test error");
        lambdaExceptionHandler.setMessage("Error in the TestLambda execution");
        lambdaExceptionHandler.addError("Error into the lambda");
        lambdaExceptionHandler.addError("Because it must fail epically");
        lambdaExceptionHandler.throwException();

        outputStream.write("Is okey :/" .getBytes());
    }
}

这是 pom:

<?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>test</groupId>
    <artifactId>aws-lambda</artifactId>
    <version>1.0</version>
    <name>AWS Lambda</name>
    <description>AWS TEST</description>
    <packaging>jar</packaging>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>

        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-lambda-java-core</artifactId>
            <version>1.2.0</version>
            <type>jar</type>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>5.3.0-M1</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.hamcrest/hamcrest-core -->
        <dependency>
            <groupId>org.hamcrest</groupId>
            <artifactId>hamcrest-core</artifactId>
            <version>1.3</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
    </dependencies>
</project>

Answer 1

好的，我可以通过在 pom 中添加插件 maven-shade-plugin 来修复它。

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <createDependencyReducedPom>false</createDependencyReducedPom>
                <shadedArtifactAttached>true</shadedArtifactAttached>
                <shadedClassifierName>lambda</shadedClassifierName>
            </configuration>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>