Thanks for your helpful comments Bjorn. I managed to compile the code with maven but when it run it fails with
Application is ReduceByKey
Exception in thread "main" java.lang.NoSuchMethodError:
scala.package$.Seq()Lscala/collection/immutable/Seq$;
at ReduceByKey$.main(ReduceByKey.scala:23)
at ReduceByKey.main(ReduceByKey.scala)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit.org
$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:1020)
at
org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:192)
at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:215)
at
org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:91)
at
org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1111)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1120)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
I attach the pom.xml and the sample scala code is self contained and basic.
Again it runs with SBT with no issues.
FYI, my scala version on host is
scala -version
Scala code runner version 2.13.6 -- Copyright 2002-2021, LAMP/EPFL and
Lightbend, Inc.
I think I have a scala incompatible somewhere again
Cheers
Mich Talebzadeh,
Lead Solutions Architect/Engineering Lead
Palantir Technologies Limited
London
United Kingdom
view my Linkedin profile
<https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/>
https://en.everybodywiki.com/Mich_Talebzadeh
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On Sun, 28 May 2023 at 20:29, Bjørn Jørgensen <bjornjorgen...@gmail.com>
wrote:
> From chatgpt4
>
>
> The problem appears to be that there is a mismatch between the version of
> Scala used by the Scala Maven plugin and the version of the Scala library
> defined as a dependency in your POM. You've defined your Scala version in
> your properties as `2.12.17` but you're pulling in `scala-library` version
> `2.13.6` as a dependency.
>
> The Scala Maven plugin will be using the Scala version defined in the
> `scala.version` property for compilation, but then it tries to load classes
> from a different Scala version, hence the error.
>
> To resolve this issue, make sure the `scala.version` property matches the
> version of `scala-library` defined in your dependencies. In your case, you
> may want to change `scala.version` to `2.13.6`.
>
> Here's the corrected part of your POM:
>
> ```xml
> <properties>
> <maven.compiler.source>1.7</maven.compiler.source>
> <maven.compiler.target>1.7</maven.compiler.target>
> <encoding>UTF-8</encoding>
> <scala.version>2.13.6</scala.version> <!-- Here's the change -->
> <maven-scala-plugin.version>2.15.2</maven-scala-plugin.version>
> </properties>
> ```
>
> Additionally, ensure that the Scala versions in the Spark dependencies
> match the `scala.version` property as well. If you've updated the Scala
> version to `2.13.6`, the artifactIds for Spark dependencies should be
> `spark-core_2.13` and `spark-sql_2.13`.
>
> Another thing to consider: your Java version defined in
> `maven.compiler.source` and `maven.compiler.target` is `1.7`, which is
> quite outdated and might not be compatible with the latest versions of
> these libraries. Consider updating to a more recent version of Java, such
> as Java 8 or above, depending on the requirements of the libraries you're
> using.
>
>
>
> The same problem persists in this updated POM file - there's a mismatch in
> the Scala version declared in the properties and the version used in your
> dependencies. Here's what you need to update:
>
> 1. Update the Scala version in your properties to match the Scala library
> and your Spark dependencies:
>
> ```xml
> <properties>
> <maven.compiler.source>1.7</maven.compiler.source>
> <maven.compiler.target>1.7</maven.compiler.target>
> <encoding>UTF-8</encoding>
> <scala.version>2.13.6</scala.version> <!-- updated Scala version -->
> <maven-scala-plugin.version>2.15.2</maven-scala-plugin.version>
> </properties>
> ```
>
> 2. Make sure all your Spark dependencies use the same Scala version. In
> this case, I see `spark-streaming-kafka_2.11` which should be
> `spark-streaming-kafka_2.13` if you're using Scala `2.13.6`.
>
> ```xml
> <dependency>
> <groupId>org.apache.spark</groupId>
> <artifactId>spark-streaming-kafka_2.13</artifactId> <!-- updated to
> 2.13 -->
> <version>1.6.3</version> <!-- this might also need to be updated as
> this is a very old version -->
> <scope>provided</scope>
> </dependency>
> ```
>
> 3. As mentioned in the previous message, your Java version
> (`maven.compiler.source` and `maven.compiler.target`) is also quite
> outdated. Depending on the requirements of the libraries you're using, you
> might want to update this to a newer version, such as Java 8 or above.
>
> Finally, ensure that the correct versions of these libraries exist in your
> Maven repository or are available in the central Maven repository. If the
> versions don't match, Maven will not be able to find and download the
> correct dependencies, which can lead to problems.
>
> Please note that it's crucial to maintain consistency in your Scala and
> Java versions across your project and its dependencies to avoid these kinds
> of issues. Mixing versions can lead to binary incompatibility errors, such
> as the one you're seeing.
>
>
>
>
>
>
>
> The differences in behavior between SBT and Maven when resolving Scala
> dependencies can be attributed to how they each handle Scala binary
> versions.
>
> SBT is specifically designed for Scala projects and has built-in support
> for handling Scala's binary compatibility issues. When you define a Scala
> library dependency in SBT, you can specify the Scala binary version as
> "_2.12", "_2.13", etc. in the library artifact name. SBT will then
> automatically replace this with the actual Scala binary version defined in
> your SBT configuration. So, if you've defined different Scala versions for
> your project and for a specific dependency, SBT will handle this gracefully.
>
> Maven, on the other hand, is more generic and does not have the same level
> of built-in support for Scala's binary versions. In Maven, the Scala
> version is typically hardcoded in the artifact name, and if this doesn't
> match the actual Scala version used in your project, it can lead to binary
> compatibility issues.
>
> This difference between SBT and Maven means that a project can work fine
> when built with SBT but fail when built with Maven, due to these Scala
> version discrepancies. To avoid these issues in Maven, you need to ensure
> that the Scala version is consistent across your project configuration and
> all your dependencies.
>
> Also, another reason for this can be because SBT often fetches
> dependencies on the fly, while Maven requires them to be explicitly
> declared. SBT can download and link the correct Scala library version even
> if it's not explicitly declared, while Maven will only use the versions
> that have been specified in the POM file.
>
> To summarize, SBT is more flexible and Scala-oriented than Maven, which
> can lead to different behavior when handling Scala dependencies. When using
> Maven for Scala projects, it's essential to ensure that all Scala versions
> match across the project.
>
> søn. 28. mai 2023 kl. 21:03 skrev Mich Talebzadeh <
> mich.talebza...@gmail.com>:
>
>> This compilation works fine with SBT but fails with maven!
>>
>> Spark version 3.4.0
>> Apache Maven 3.9.2 (c9616018c7a021c1c39be70fb2843d6f5f9b8a1c)
>> Java version: 11.0.1, vendor: Oracle Corporation, runtime: /opt/jdk-11.0.1
>>
>> This from the pom.xml file
>>
>> <project xmlns="https://maven.apache.org/POM/4.0.0"; xmlns:xsi="
>> https://www.w3.org/2001/XMLSchema-instance";
>> xsi:schemaLocation="https://maven.apache.org/POM/4.0.0
>> https://maven.apache.org/maven-v4_0_0.xsd";>
>> <modelVersion>4.0.0</modelVersion>
>> <groupId>spark</groupId>
>> <version>3.0</version>
>> <name>${project.artifactId}</name>
>>
>> <properties>
>> <maven.compiler.source>1.7</maven.compiler.source>
>> <maven.compiler.target>1.7</maven.compiler.target>
>> <encoding>UTF-8</encoding>
>> <scala.version>2.12.17</scala.version>
>> <maven-scala-plugin.version>2.15.2</maven-scala-plugin.version>
>> </properties>
>> <dependencies>
>> <dependency>
>> <groupId>org.scala-lang</groupId>
>> <artifactId>scala-library</artifactId>
>> <version>2.13.6</version>
>> </dependency>
>> <dependency>
>> <groupId>org.apache.spark</groupId>
>> <artifactId>spark-core_2.13</artifactId>
>> <version>3.4.0</version>
>> <scope>provided</scope>
>> </dependency>
>> <dependency>
>> <groupId>org.apache.spark</groupId>
>> <artifactId>spark-sql_2.13</artifactId>
>> <version>3.4.0</version>
>> <scope>provided</scope>
>>
>> The pom file is attached. These are the errors I am getting
>>
>> [ERROR] error: error while loading package, class file
>> '/home/hduser/.m2/repository/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar(scala/reflect/package.class)'
>> is broken
>> [ERROR] (class java.lang.RuntimeException/error reading Scala signature
>> of package.class: Scala signature package has wrong version
>> [ERROR] error: error while loading package, class file
>> '/home/hduser/.m2/repository/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar(scala/package.class)'
>> is broken
>> [ERROR] (class java.lang.RuntimeException/error reading Scala signature
>> of package.class: Scala signature package has wrong version
>> [ERROR] error: error while loading package, class file
>> '/home/hduser/.m2/repository/org/scala-lang/scala-library/2.13.6/scala-library-2.13.6.jar(scala/collection/package.class)'
>> is broken
>> [ERROR] (class java.lang.RuntimeException/error reading Scala signature
>> of package.class: Scala signature package has wrong version
>> [ERROR] three errors found
>> [ERROR] Failed to execute goal
>> org.scala-tools:maven-scala-plugin:2.15.2:compile (default) on project
>> scala: wrap: org.apache.commons.exec.ExecuteException: Process exited with
>> an error: 1(Exit value: 1) -> [Help 1]
>>
>> Any ideas will be appreciated.
>>
>> Mich Talebzadeh,
>> Lead Solutions Architect/Engineering Lead
>> Palantir Technologies Limited
>> London
>> United Kingdom
>>
>>
>> view my Linkedin profile
>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/>
>>
>>
>> https://en.everybodywiki.com/Mich_Talebzadeh
>>
>>
>>
>> *Disclaimer:* Use it at your own risk. Any and all responsibility for
>> any loss, damage or destruction of data or any other property which may
>> arise from relying on this email's technical content is explicitly
>> disclaimed. The author will in no case be liable for any monetary damages
>> arising from such loss, damage or destruction.
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe e-mail: user-unsubscr...@spark.apache.org
>
>
>
> --
> Bjørn Jørgensen
> Vestre Aspehaug 4, 6010 Ålesund
> Norge
>
> +47 480 94 297
>
<project xmlns="https://maven.apache.org/POM/4.0.0"; xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd";> <modelVersion>4.0.0</modelVersion> <groupId>spark</groupId> <version>3.0</version> <artifactId>ReduceByKey</artifactId> <name>${project.artifactId}</name> <properties> <maven.compiler.source>11.0.1</maven.compiler.source> <maven.compiler.target>11.0.1</maven.compiler.target> <encoding>UTF-8</encoding> <scala.version>2.13.6</scala.version> <maven-scala-plugin.version>2.15.2</maven-scala-plugin.version> </properties> <dependencies> <dependency> <groupId>org.scala-lang</groupId> <artifactId>scala-library</artifactId> <version>2.13.11-M2</version> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-core_2.13</artifactId> <version>3.4.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-sql_2.13</artifactId> <version>3.4.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-hive_2.13</artifactId> <version>3.4.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-streaming_2.13</artifactId> <version>3.4.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-streaming-kafka-0-10_2.13</artifactId> <version>3.4.0</version> </dependency> <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-mllib_2.13</artifactId> <version>3.4.0</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>ReduceByKey</finalName> <sourceDirectory>src/main/scala</sourceDirectory> <plugins> <plugin> <groupId>org.scala-tools</groupId> <artifactId>maven-scala-plugin</artifactId> <version>${maven-scala-plugin.version}</version> <executions> <execution> <goals> <goal>compile</goal> </goals> </execution> </executions> <configuration> <jvmArgs> <jvmArg>-Xms64m</jvmArg> <jvmArg>-Xmx1024m</jvmArg> </jvmArgs> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>1.6</version> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> <configuration> <filters> <filter> <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>com.group.id.Launcher1</mainClass> </transformer> </transformers> </configuration> </execution> </executions> </plugin> </plugins> </build> <!--<artifactId>scala</artifactId>--> </project>
ReduceByKey.scala
Description: Binary data
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