java.lang.NoClassDefFoundError when adding a custom library to the classpath

[SButterfly]

Hello.

Our team deploy Google function from a jar

gcloud functions deploy 'report-generation' --region=europe-west2 --entry-point  'my.company.ReportGenerationFunction' --source /target/deployment/

Once we decided to add our custom library to the dependencies, the function (in gcloud) started failing with

Failed to execute my.company.ReportGenerationFunction java.lang.NoClassDefFoundError: my/company/rules/CurrencyConversion

Locally everything works fine

Technical information: Deployment folder is generated like this

<build>
    <plugins>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <classpathPrefix>libs/</classpathPrefix>
            </manifest>
          </archive>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-dependency-plugin</artifactId>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>copy-dependencies</goal>
            </goals>
            <configuration>
              <overWriteReleases>false</overWriteReleases>
              <includeScope>runtime</includeScope>
              <outputDirectory>${project.build.directory}/libs</outputDirectory>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <executions>
          <execution>
            <id>copy-resources</id>
            <phase>package</phase>
            <goals>
              <goal>copy-resources</goal>
            </goals>
            <configuration>
              <outputDirectory>${project.build.directory}/deployment</outputDirectory>
              <resources>
                <resource>
                  <directory>${project.build.directory}</directory>
                  <includes>
                    <include>${project.build.finalName}.jar</include>
                    <include>libs/**</include>
                  </includes>
                  <filtering>false</filtering>
                </resource>
              </resources>
            </configuration>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

Versions:

google.cloud.functions: 1.1.0
google.cloud.functions.plugin: 0.11.0
com.google.cloud:libraries-bom:26.21.0

[garethgeorge]

Hi @SButterfly, sorry you're running into a problem here! It looks like the entrypoint GCF is looking for is my/company/rules/CurrencyConversion which doesn't seem right based on your deploy command.

Let's start by verifying the configuration GCF has for your function, would you mind checking the entryPoint value output by gcloud functions describe <your function>?

[SButterfly]

Hi @garethgeorge! Turned out we had problems with the broken library + the company's maven repository. After fixing them the problem was gone.