GCP HTTP Example fails to deploy - ClassNotFound exception - JarLauncher

[ggranum]

Describe the bug
Building and deploying the Main branch version of spring-cloud-function-samples/function-sample-gcp-http fails with 'java.lang.ClassNotFoundException: org.springframework.boot.loader.JarLauncher'

The 4.0.x branch still packages and deploys as expected.

Steps
Clone project && cd project
./mvnw install
cd spring-cloud-function-samples/function-sample-gcp-http
mvn package
gcloud functions deploy function-sample-gcp-http
--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher
--runtime java17
--trigger-http
--source target/deploy
--memory 512MB

deploy fails with above exception.

What works
cd projectRoot
git checkout 4.0.x
mvn clean
cd spring-cloud-function-samples/function-sample-gcp-http
mvn package
gcloud functions deploy function-sample-gcp-http
--entry-point org.springframework.cloud.function.adapter.gcp.GcfJarLauncher
--runtime java17
--trigger-http
--source target/deploy
--memory 512MB

Further Info
I tried JDK20, 21 and 17. All Temurin.

[SND33]

We're suffering from the same issue. After upgrading Spring Boot to 3.2.0, we started getting this error on startup when deployed on GCP. Upon inspecting the JAR built by the Spring Boot Maven plugin, we can see that indeed the JarLauncher class it not in that place. This causes the error because GcfJarLauncher extends JarLauncher.

The Spring Boot 3.2.0 release notes explain that the Spring Boot loader tools have moved to the launch package, which explains the error. They also provide a workaround to use the classic loader tools by adding following configuration to the Spring Boot Maven plugin:

<build>
  <plugins>
    <plugin>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-maven-plugin</artifactId>
      <executions>
        <execution>
          <goals>
            <goal>repackage</goal>
          </goals>
          <configuration>
            <loaderImplementation>CLASSIC</loaderImplementation>
          </configuration>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>

When doing that, the classic loader tools are packaged by the plugin, which should in theory resolve the issue. However, we found out that's in fact the spring-cloud-function-adapter-gcp dependency, which must be added as a dependency for the plugin, that overwrites this behaviour and ends up not including the classic loader tools (we confirmed that without the adapter, and with the above change, the built JAR does include the classic loader tools).

Is anyone aware of a workaround? If not, we're forced to downgrade Spring Boot, as well as Spring Cloud.

UPDATE: downgrading to Spring Boot 3.1.6 resolved the issue as expected

[ecky-l]

Same here. Also looking for a workaround or a solution.

[cfranzen]

Looking for a solution for Gradel. There seems to be no solution at the moment.

[Masahito-I]

I'm also facing this issue. Is there any solution?

P.S. for now, I decided to downgrade the SpringBoot version from 3.2.4 to 3.1.10.
The deployment was successful after that.
If you'd like to implement your function ASAP, please consider to downgrade it.

[PMG-VascoSaavedra]

I was able to sort this out, with the help of a friend.

Basically, i would have to change the signature to receive an Object, and then cast to a BufferedReader.
Afterwards, i would have to read from it line by line, parse the lines and create a Key/Value Map.

I tested this and it worked.

@SpringBootApplication
public class CloudFunctionMain {

    private static final Logger log = LoggerFactory.getLogger(CloudFunctionMain.class);

    public static void main(String[] args) {
		SpringApplication.run(CloudFunctionMain.class, args);
    }

    @Bean
    public Function<Object, ResponseEntity<Object>> function() {
    return this::handleNotify;
    }

    private ResponseEntity<Object> handleNotify(final Object values) {

		BufferedReader request = ((BufferedReader) values);

                //Read BufferedReader, parse the lines and add values to a Map.

		
		return new ResponseEntity<>(null, new HttpHeaders(), HttpStatus.OK);
    }
}

In the end, i opted to use Quarkus.

[MawsFr]

Here is a working pom.xml based on what @Masahito-I said. It uses GCP spring cloud function + Webflux + gcp secret manager.

I think this is linked to the fact that JarLauncher has been moved but the current version of spring-cloud-function seems to point to the old JarLauncher folder (Source).

Hope it will be fixed soon ^^

<?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>com.examples</groupId>
    <artifactId>example</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>example</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.10</version> <!-- DO NOT UPGRADE see : https://github.com/spring-cloud/spring-cloud-function/issues/1085 -->
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <java.version>21</java.version>
        <spring-cloud-function.version>4.1.1</spring-cloud-function.version>
        <mockito-core.version>5.11.0</mockito-core.version>
        <logstash-logback-encoder.version>7.4</logstash-logback-encoder.version>
        <google-cloud-storage.version>2.36.1</google-cloud-storage.version>
        <java-function-invoker.version>1.3.1</java-function-invoker.version>
        <spring-cloud-gcp-starter-secretmanager.version>5.1.2</spring-cloud-gcp-starter-secretmanager.version>
        <spring-cloud-gcp-dependencies.version>4.8.4</spring-cloud-gcp-dependencies.version>

        <!-- JUnit Properties -->
        <junit-bom.version>5.10.2</junit-bom.version>

        <!-- JaCoCo Properties -->
        <jacoco-maven-plugin.version>0.8.12</jacoco-maven-plugin.version>
        <maven-failsafe-plugin.version>3.2.5</maven-failsafe-plugin.version>
        <junit-jupiter-engine.version>5.10.2</junit-jupiter-engine.version>
        <jacoco-maven-plugin.version>0.8.12</jacoco-maven-plugin.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-function-webflux</artifactId>
            <version>${spring-cloud-function.version}</version>
        </dependency>

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

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-function-adapter-gcp</artifactId>
            <version>${spring-cloud-function.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- DO NOT DELETE THIS https://stackoverflow.com/a/78164824 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
        </dependency>

        <!-- logs -->
        <dependency>
            <groupId>net.logstash.logback</groupId>
            <artifactId>logstash-logback-encoder</artifactId>
            <version>${logstash-logback-encoder.version}</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
        </dependency>

        <!-- To use gcp bucket -->
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>google-cloud-storage</artifactId>
            <version>${google-cloud-storage.version}</version>
        </dependency>

        <!-- Add Secret Manager Starter -->
        <dependency>
            <groupId>com.google.cloud</groupId>
            <artifactId>spring-cloud-gcp-starter-secretmanager</artifactId>
            <version>${spring-cloud-gcp-starter-secretmanager.version}</version>
        </dependency>

        <!-- tools -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- test dependencies -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webflux</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <version>${mockito-core.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.assertj</groupId>
            <artifactId>assertj-core</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.google.cloud.functions.invoker</groupId>
            <artifactId>java-function-invoker</artifactId>
            <version>${java-function-invoker.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-junit-jupiter</artifactId>
            <version>${mockito-core.version}</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-deploy-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <outputDirectory>target/deploy</outputDirectory>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.springframework.cloud</groupId>
                        <artifactId>spring-cloud-function-adapter-gcp</artifactId>
                        <version>${spring-cloud-function.version}</version>
                    </dependency>
                </dependencies>
            </plugin>

            <plugin>
                <groupId>com.google.cloud.functions</groupId>
                <artifactId>function-maven-plugin</artifactId>
                <version>0.9.1</version>
                <configuration>
                    <functionTarget>org.springframework.cloud.function.adapter.gcp.GcfJarLauncher</functionTarget>
                    <port>8080</port>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>${maven-surefire-plugin.version}</version>
                <dependencies>
                    <dependency>
                        <groupId>org.junit.jupiter</groupId>
                        <artifactId>junit-jupiter-engine</artifactId>
                        <version>${junit-jupiter-engine.version}</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <phase>integration-test</phase>
                        <goals>
                            <goal>test</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>${maven-failsafe-plugin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>integration-test</goal>
                            <goal>verify</goal>
                        </goals>
                        <configuration>
                            <includes>
                                <include>**/*IT.java</include>
                            </includes>
                        </configuration>
                    </execution>
                </executions>
                <configuration>
                    <!-- failsafe coverage per test reports can be shown in Sonar
                    only if they are put in the same dir as surefire reports -->
                    <reportsDirectory>${project.build.directory}/surefire-reports</reportsDirectory>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>${jacoco-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <id>jacoco-initialize</id>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>prepare-agent-it</id>
                        <goals>
                            <goal>prepare-agent-integration</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>jacoco-site</id>
                        <phase>package</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                        <configuration>
                            <dataFile>${project.build.directory}/jacoco.exec</dataFile>
                        </configuration>
                    </execution>
                    <execution>
                        <id>report-it</id>
                        <goals>
                            <goal>report-integration</goal>
                        </goals>
                        <configuration>
                            <dataFile>${project.build.directory}/jacoco-it.exec</dataFile>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <!-- DO NOT CHANGE : https://stackoverflow.com/a/78207517 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.junit</groupId>
                <artifactId>junit-bom</artifactId>
                <version>${junit-bom.version}</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
            <dependency>
                <groupId>com.google.cloud</groupId>
                <artifactId>spring-cloud-gcp-dependencies</artifactId>
                <version>${spring-cloud-gcp-dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/libs-snapshot-local</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <releases>
                <enabled>false</enabled>
            </releases>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone-local</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>https://repo.spring.io/release</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/libs-snapshot-local</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
            <releases>
                <enabled>false</enabled>
            </releases>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone-local</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>https://repo.spring.io/libs-release-local</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <profiles>
        <profile>
            <id>macos-aarch64</id>
            <activation>
                <os>
                    <family>mac</family>
                    <arch>aarch64</arch>
                </os>
            </activation>
            <dependencies>
                <dependency>
                    <groupId>io.netty</groupId>
                    <artifactId>netty-resolver-dns-native-macos</artifactId>
                    <version>${netty.version}</version>
                    <classifier>osx-aarch_64</classifier>
                </dependency>
            </dependencies>
        </profile>
    </profiles>

</project>

[petrosyanar]

The same issue here. The Spring Boot 3.3.x is blocked now in our cloud functions

[Mowee]

We have the same problem with Gradle. We are currently still using Spring Boot 3.1 which unfortunately lost support last month.