java - 为什么Alternator模拟DynamoDB无法通过maven失败但不能通过Eclipse失败？

关于此问题，我一直与Alternator的作者联系，他和我一样感到困惑。简短的故事：我编写了使用Alternator模拟框架针对DynamoDB进行操作的代码的单元测试，当我从Eclipse中调用它们时，它们可以正常工作，而从maven中调用时，则可以失败。

该故障是由AWS SDK本身引起的：

com.amazonaws.AmazonServiceException: [java.lang.Error: property value is null.]
    at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:679) ~[aws-java-sdk-1.5.5.jar:na]
    at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:350) ~[aws-java-sdk-1.5.5.jar:na]
    at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:202) ~[aws-java-sdk-1.5.5.jar:na]
    at com.michelboudreau.alternatorv2.AlternatorDBClientV2.invoke(AlternatorDBClientV2.java:225) ~[alternator-0.6.4.jar:na]
    at com.michelboudreau.alternatorv2.AlternatorDBClientV2.updateItem(AlternatorDBClientV2.java:99) ~[alternator-0.6.4.jar:na]
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper$2.executeLowLevelRequest(DynamoDBMapper.java:646) ~[aws-java-sdk-1.5.5.jar:na]
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper$SaveObjectHandler.execute(DynamoDBMapper.java:767) ~[aws-java-sdk-1.5.5.jar:na]
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.save(DynamoDBMapper.java:658) ~[aws-java-sdk-1.5.5.jar:na]
    at com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper.save(DynamoDBMapper.java:488) ~[aws-java-sdk-1.5.5.jar:na]
    at com.somoglobal.eventdata.Controller.addDeviceKeys(Controller.java:531) ~[classes/:na]

正如您所看到的那样，这并不是很有用，因为堆栈跟踪本身只是在AWS开发工具包从（通过模拟的）远程服务接收到的响应中组装异常时显示堆栈。

相关版本号：


Maven的3.0.4
Java 1.7.0_10
AWS开发工具包1.5.5（尽管我也尝试过1.5.3和1.5.4）
Eclipse版本“ Kepler”，内部版本ID：20130614-0229


进一步挖掘项目的（略微省略）pom.xml

<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">

    <parent>
        <groupId>snip</groupId>
        <artifactId>snip</artifactId>
        <version>1.14.2-SNAPSHOT</version>
    </parent>
    <artifactId>snip</artifactId>
    <version>1.6.0-SNAPSHOT</version>
    <name>snip</name>
    <dependencies>
        ...snip...
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-java-sdk</artifactId>
            <version>1.5.5</version>
        </dependency>
        <dependency>
            <groupId>com.michelboudreau</groupId>
            <artifactId>alternator</artifactId>
            <version>0.6.4</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

以及略微缩小的测试：

package com.xxx;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

import org.joda.time.DateTime;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestRule;

import com.amazonaws.Request;
import com.amazonaws.handlers.RequestHandler;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;
import com.amazonaws.services.dynamodbv2.model.AttributeDefinition;
import com.amazonaws.services.dynamodbv2.model.CreateTableRequest;
import com.amazonaws.services.dynamodbv2.model.CreateTableResult;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughput;
import com.amazonaws.services.dynamodbv2.model.ProvisionedThroughputExceededException;
import com.amazonaws.util.TimingInfo;
import com.michelboudreau.alternator.AlternatorDB;
import com.michelboudreau.alternatorv2.AlternatorDBClientV2;
import com.xxx.stuff;

public class ControllerTest {

    private static Controller instance;
    private static DynamoDBMapper mapper;
    private static AlternatorDB db;
    private static AlternatorDBClientV2 client;

    @BeforeClass
    public static void setup() throws Exception {
        client = new AlternatorDBClientV2();
        mapper = new DynamoDBMapper(client);
        db = new AlternatorDB().start();
        // code to create dynamodb was here
        instance = new Controller(mapper);
    }

    @AfterClass
    public static void tearDown() throws Exception {
        db.stop();
    }

    @Test
    public void testAddDeviceKeys() {
        Collection<DeviceKey> keys = EventDataModelMapper.getDeviceKeys(ClassFixtures.event);
        assertNotNull("keys should not be null", keys);
        assertFalse("keys should not be empty", keys.isEmpty());

        boolean result = instance.addDeviceKeys(keys);
        assertTrue("result should be true", result);
    }
}

被测试的代码可能并没有特别涉及到此失败-我已经进行了足够的调试跟踪，以查看在通过Eclipse直接调用以及从maven运行时，它在测试期间的行为相同。

编辑

实际上，Alternator可能与此有关，因为有问题的错误消息可能来自com.michelboudreau.alternator.validation.ValidatorUtils：

    public static <T> List<Error> rejectIfNull(T property) {
            List<Error> errors = new ArrayList<Error>();
            if (property == null) {
                    errors.add(new Error("property value is null."));
            }
            return errors;
    }

最佳答案

好吧，站下来，交流发电机没有错，问题出在我工作场所的一把椅子和键盘之间。有问题的错误消息确实是由Alternator引起的，并且最终被归因于缺少的表定义-由于非常复杂的原因，当通过Maven运行测试时，通过Alternator创建的模拟Dynamodb表的名称与被测代码试图访问的表名。

我要公开感谢米歇尔·布德罗（Michel Boudreau）在我就此事直接与他联系时花时间回答。

关于java - 为什么Alternator模拟DynamoDB无法通过maven失败但不能通过Eclipse失败？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18610510/