Gatling Enterprise - Unable to execute Simulation due to Wrapped by: java.lang.IllegalArgumentException: User defined Simulation class could not be loaded

vigneshsrinivasan · February 10, 2024, 4:01pm

In my local Gatling SCALA repository I have ran mvn clean compile to clear the target folder
Then ran mvn gatling:enterprisePackage to generate the jar file
Uploaded this JAR in Enterprise Cloud
Created a simulation using this JAR
When executing the Simulation it throws error as Unable to execute Simulation due to Wrapped by: java.lang.IllegalArgumentException: User defined Simulation class could not be loaded
But before uploading the JAR itself I have cross checked. All the test class are present in the Simulation folder

sbrevet · February 10, 2024, 5:01pm

I tried to reproduce what you described like that:

Clone the maven scala demo project (as you mentioned scala and mvn)

$ git clone git@github.com:gatling/gatling-maven-plugin-demo-scala.git

Run enterprisePackage target:
```
$ mvn gatling:enterprisePackage
```
Log into Gatling Enterprise Cloud
Create a new Simulation

2024-02-10_174046_989x838989×838 41.1 KB
Click on Save and launch
Wait for run initialization
Enjoy the result

2024-02-10_174228_1824x8321824×832 91.6 KB

So, I cannot reproduce.

But what I saw in your log is this part:

2024-02-10 15:29:21,593 [WARN ] a.u.ManifestInfo - Could not read manifest information. java.io.IOException: line too long (line 9)

So it seems that you have a long line in this file inside this META-INF/MANIFEST.MF file in your package.
Do you have many simulations in this package? Do you have long package names?

I will dig deeper in that issue during work hours, but in the meantime, you may try to “hide” other Simulation classes (by moving them out of src/main/scala for instance)

Can you provide your META-INF/MANIFEST.MF for analyse?
If you don’t want it to be publicly visible, you can send it through our support portal: (create a ticket and then you will be able to upload files)

Cheers!

slandelle · February 10, 2024, 9:09pm

Hi @vigneshsrinivasan ,

I think you’re facing a bug that’s been fixed yesterday where the JVM can’t load the package when it contains too many simulations.

Please upgrade to the latest version of the build plugin you’re using and then re-generate and re-upload your package:

maven: 4.8.2
sbt: 4.8.1
gradle: 3.10.3.3

Regards

vigneshsrinivasan · February 11, 2024, 11:12am

@slandelle
Yes you are correct. I was having 35+ simulation under my simulations folder.
I have upgraded gatling-maven-plugin = 4.8.2
Rebuild the package and uploaded to Cloud
It did work

Thanks for your support @slandelle

Below is my pom.xml. Could be a reference

<?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>org.learning</groupId>
    <artifactId>Gatling-Scala</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <encoding>UTF-8</encoding>

        <gatling.version>3.10.3</gatling.version>
        <gatling-maven-plugin.version>4.8.2</gatling-maven-plugin.version>
        <scala-maven-plugin.version>4.8.1</scala-maven-plugin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>io.gatling.highcharts</groupId>
            <artifactId>gatling-charts-highcharts</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <dependency>
            <groupId>io.gatling</groupId>
            <artifactId>gatling-app</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <dependency>
            <groupId>io.gatling</groupId>
            <artifactId>gatling-recorder</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.github.javafaker/javafaker -->
        <dependency>
            <groupId>com.github.javafaker</groupId>
            <artifactId>javafaker</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>${scala-maven-plugin.version}</version>
        </dependency>
    </dependencies>

    <build>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>io.gatling</groupId>
                <artifactId>gatling-maven-plugin</artifactId>
                <version>${gatling-maven-plugin.version}</version>
                <configuration>
                    <!--   ...  -->
                    <runMultipleSimulations>true</runMultipleSimulations>
                    <includes>
                        <include>simulations.basics.AddPauseTest</include>
                        <include>simulations.basics.AssertResponseBody</include>
                    </includes>
                    <excludes>
                        <exclude>my.package.IgnoredSimulation</exclude>
                    </excludes>
                    <apiToken>D5W</apiToken>
                </configuration>
            </plugin>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>${scala-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                        <configuration>
                            <jvmArgs>
                                <jvmArg>-Xss100M</jvmArg>
                            </jvmArgs>
                            <args>
                                <arg>-deprecation</arg>
                                <arg>-feature</arg>
                                <arg>-unchecked</arg>
                                <arg>-language:implicitConversions</arg>
                                <arg>-language:postfixOps</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

slandelle · February 11, 2024, 11:30am

Great!

Then, you should definitely remove scala-maven-plugin from the dependencies. It’s not a project dependency but a build plugin. You’re adding lots of dead weight and possibly creating conflicts.

vigneshsrinivasan · February 11, 2024, 11:49am

@slandelle
Earlier I didnt add it. But when executing test via maven using mvn gatling:test
It throws error related to Scala
After lot of research found out its a compilation issue.
And thats where I have found this plugin mentioned in Gatling official page
Do you still recommend to remove those ?

sbrevet · February 11, 2024, 11:59am

Indeed, the scala-maven-plugin is needed in order to compile scala. So you need to keep the mention in the project.build.plugins.plugin node of your pom.xml.

Only the mention in the project.dependencies.dependency node, yes!

Cheers!

vigneshsrinivasan · February 11, 2024, 12:19pm

Thanks @sbrevet for the clear explanation
Removed the scala-maven-plugin from project.dependencies.dependency node

Updated 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>org.learning</groupId>
    <artifactId>Gatling-Scala</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <encoding>UTF-8</encoding>

        <gatling.version>3.10.3</gatling.version>
        <gatling-maven-plugin.version>4.8.2</gatling-maven-plugin.version>
        <scala-maven-plugin.version>4.8.1</scala-maven-plugin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>io.gatling.highcharts</groupId>
            <artifactId>gatling-charts-highcharts</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <dependency>
            <groupId>io.gatling</groupId>
            <artifactId>gatling-app</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <dependency>
            <groupId>io.gatling</groupId>
            <artifactId>gatling-recorder</artifactId>
            <version>${gatling.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.github.javafaker/javafaker -->
        <dependency>
            <groupId>com.github.javafaker</groupId>
            <artifactId>javafaker</artifactId>
            <version>1.0.2</version>
        </dependency>
    </dependencies>

    <build>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <plugins>
            <plugin>
                <groupId>io.gatling</groupId>
                <artifactId>gatling-maven-plugin</artifactId>
                <version>${gatling-maven-plugin.version}</version>
                <configuration>
                    <runMultipleSimulations>true</runMultipleSimulations>
                    <includes>
                        <include>simulations.basics.AddPauseTest</include>
                        <include>simulations.basics.AssertResponseBody</include>
                    </includes>
                    <excludes>
                        <exclude>my.package.IgnoredSimulation</exclude>
                    </excludes>
                    <apiToken>D5W</apiToken>
                </configuration>
            </plugin>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>${scala-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                        <configuration>
                            <jvmArgs>
                                <jvmArg>-Xss100M</jvmArg>
                            </jvmArgs>
                            <args>
                                <arg>-deprecation</arg>
                                <arg>-feature</arg>
                                <arg>-unchecked</arg>
                                <arg>-language:implicitConversions</arg>
                                <arg>-language:postfixOps</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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Gatling Enterprise - Unable to execute Simulation due to Wrapped by: java.lang.IllegalArgumentException: User defined Simulation class could not be loaded

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