Apache Flink - 外置 Jar

Question

我试图使用maven和一个额外的依赖创建一个Flink应用程序。

 <dependency>
      <groupId>com.microsoft.sqlserver</groupId>
      <artifactId>mssql-jdbc</artifactId>
      <version>8.2.2.jre11</version>
  </dependency>

我试图从我们的数据库中获取额外的信息。当我在本地运行代码时，一切正常，但当我在Flink上运行时，我得到这个错误信息。

所以我最初的想法是依赖关系没有被加载到使用maven shadow pluging的fat jar上，但我认为是的。

我的Flink运行在一个docker容器中，我在容器上打开了1433:1433端口（在编译中）。

我的目标是将SQL数据添加到流中，用于用户自定义规则的警报系统。

下面是我的pom.xml的内容。

-->http:/maven.apache.orgxsdmaven-4.0.0.xsd"> 4.0.0。

<groupId>org.qscale</groupId>
<artifactId>FlinkPrototype</artifactId>
<version>1.0</version>
<packaging>jar</packaging>

<name>Flink Quickstart Job</name>
<url>http://www.myorganization.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <flink.version>1.10.0</flink.version>
    <java.version>1.8</java.version>
    <scala.binary.version>2.11</scala.binary.version>
    <maven.compiler.source>${java.version}</maven.compiler.source>
    <maven.compiler.target>${java.version}</maven.compiler.target>
</properties>

<repositories>
    <repository>
        <id>apache.snapshots</id>
        <name>Apache Development Snapshot Repository</name>
        <url>https://repository.apache.org/content/repositories/snapshots/</url>
        <releases>
            <enabled>false</enabled>
        </releases>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

<dependencies>
    <!-- Apache Flink dependencies -->
    <!-- These dependencies are provided, because they should not be packaged into the JAR file. -->
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-java</artifactId>
        <version>${flink.version}</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-streaming-java_${scala.binary.version}</artifactId>
        <version>${flink.version}</version>
        <scope>provided</scope>
    </dependency>

    <!-- Add connector dependencies here. They must be in the default scope (compile). -->

    <!-- Example:

    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-kafka-0.10_${scala.binary.version}</artifactId>
        <version>${flink.version}</version>
    </dependency>
    -->

    <!-- Project dependencies -->
    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
        <version>8.2.2.jre11</version>
    </dependency>

    <!-- Add logging framework, to produce console output when running in the IDE. -->
    <!-- These dependencies are excluded from the application JAR by default. -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.7</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
        <scope>runtime</scope>
    </dependency>
</dependencies>

<build>
    <plugins>

        <!-- Java Compiler -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>${java.version}</source>
                <target>${java.version}</target>
            </configuration>
        </plugin>

        <!-- We use the maven-shade plugin to create a fat jar that contains all necessary dependencies. -->
        <!-- Change the value of <mainClass>...</mainClass> if your program entry point changes. -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>3.1.1</version>
            <executions>
                <!-- Run shade goal on package phase -->
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <shadedArtifactAttached>true</shadedArtifactAttached>
                        <shadedClassifierName>shaded</shadedClassifierName>
                        <artifactSet>
                            <excludes>
                                <exclude>org.apache.flink:force-shading</exclude>
                                <exclude>com.google.code.findbugs:jsr305</exclude>
                                <exclude>org.slf4j:*</exclude>
                                <exclude>log4j:*</exclude>
                            </excludes>
                        </artifactSet>
                        <filters>
                            <filter>
                                <!-- Do not copy the signatures in the META-INF folder.
                                Otherwise, this might cause SecurityExceptions when using the JAR. -->
                                <artifact>*:*</artifact>
                                <excludes>
                                    <exclude>META-INF/*.SF</exclude>
                                    <exclude>META-INF/*.DSA</exclude>
                                    <exclude>META-INF/*.RSA</exclude>
                                </excludes>
                            </filter>
                        </filters>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <mainClass>org.qscale.StreamingJob</mainClass>
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>

    <pluginManagement>
        <plugins>

            <!-- This improves the out-of-the-box experience in Eclipse by resolving some warnings. -->
            <plugin>
                <groupId>org.eclipse.m2e</groupId>
                <artifactId>lifecycle-mapping</artifactId>
                <version>1.0.0</version>
                <configuration>
                    <lifecycleMappingMetadata>
                        <pluginExecutions>
                            <pluginExecution>
                                <pluginExecutionFilter>
                                    <groupId>org.apache.maven.plugins</groupId>
                                    <artifactId>maven-shade-plugin</artifactId>
                                    <versionRange>[3.1.1,)</versionRange>
                                    <goals>
                                        <goal>shade</goal>
                                    </goals>
                                </pluginExecutionFilter>
                                <action>
                                    <ignore/>
                                </action>
                            </pluginExecution>
                            <pluginExecution>
                                <pluginExecutionFilter>
                                    <groupId>org.apache.maven.plugins</groupId>
                                    <artifactId>maven-compiler-plugin</artifactId>
                                    <versionRange>[3.1,)</versionRange>
                                    <goals>
                                        <goal>testCompile</goal>
                                        <goal>compile</goal>
                                    </goals>
                                </pluginExecutionFilter>
                                <action>
                                    <ignore/>
                                </action>
                            </pluginExecution>
                        </pluginExecutions>
                    </lifecycleMappingMetadata>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
</build>

谢谢你的帮助

Answer 1

增加 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver") 我想，在你的主方法中使用java 1.8就可以了，因为阴影似乎是正确的。

另一个问题是，你在你的 pom 中使用 java 1.8 编译，但你添加了一个用 java 11 编译的依赖关系。将jdbc的版本改为以下版本，希望能行得通。

<dependency>
      <groupId>com.microsoft.sqlserver</groupId>
      <artifactId>mssql-jdbc</artifactId>
      <version>8.2.2.jre8</version>
  </dependency>

请阅读 这个 更多详情

Answer 2

你是如何在flink上运行的？在IDE中？Docker？EC2你可能需要将依赖关系添加到你的classpath中。

你也可以尝试将scope依赖关系改为在pom中编译。

编译