小编Lew*_*son的帖子

我正在开发针对MySQL数据库的Spring Data JPA项目，并且我想从Maven运行端到端集成测试。

到目前为止，我已经配置io.fabric8.docker-maven-plugin为在pre-integration-test阶段中启动MySQL容器。它将使用一个随机的可用端口，我需要将该端口传递给我的application.properties文件。

我试着使用Maven自动属性扩展，但我怀疑mysql.portMaven的属性只得到解决后，春天属性得到更新。

pom.xml

    <?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>example</groupId>
    <artifactId>pass-port-number-from-docker-maven-plugin-to-spring-property</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- other jpa dependencies ... -->

    </dependencies>

    <build>

        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>

        <plugins>

            <plugin>
                <groupId>org.springframework.boot</groupId> …

当我发送给没有密钥的Kafka主题时，我已经通过了集成测试。但是，当我添加密钥时，我开始出现序列化错误。

org.apache.kafka.common.errors.SerializationException: Error deserializing key/value for partition topic-1 at offset 0

Caused by: org.apache.kafka.common.errors.SerializationException: Size of data received by IntegerDeserializer is not 4

这是我的发送者类：

public class Sender {
    private static final Logger LOG = LoggerFactory.getLogger(Sender.class);

    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public void send() {

        String topic = "topic";
        String data = "data";
        String key = "key";

        LOG.info("sending to topic: '{}', key: '{}', data: '{}'", topic, key, data);

        // does not work
        kafkaTemplate.send(topic, key, data);

        // works
        // kafkaTemplate.send(topic, data);

    } …