tencent cloud

This document describes how to create a zip deployment package with Gradle and create a jar deployment package with Maven. Then, you can upload the created package (if less than 50 MB) directly in the SCF console, or upload it to a COS bucket and then specify the bucket and object information in the SCF console.

Creating zip Deployment Package with Gradle

This document describes how to create a Java-type SCF function deployment package with Gradle. As long as the created zip package conforms to the following rules, it can be recognized and invoked by the SCF runtime environment.

• The compiled package, class files and resource files are located in the root directory of the zip package.
• The jar package required by the dependencies is located in the /lib directory.

Preparing environment

Make sure that you have Java and Gradle installed.

• For Java 11, install TencentKona 11 or JDK 11.
• For Java 8, install JDK 8. You can download and install the JDK appropriate for your system by using OpenJDK (Linux) or through Java.

Installing Gradle

For Gradle installation details, see Gradle Installation. The manual installation steps are as follows:

1. Download Gradle's binary package or full package with documentation and source code.
2. Unzip the package to a desired directory, such as C:\Gradle (Windows) or /opt/gradle/gradle-4.1 (Linux).
3. Add the path of the bin directory in the unzipped directory to the system environment variable PATH in the following way as appropriate:

• Linux: Add through export PATH=$PATH:/opt/gradle/gradle-4.1/bin.
• Windows: Right click Computer and select Properties > Advanced system settings > Advanced > Environment Variables, select the Path variable, click Edit, and add ;C:\Gradle\bin; at the end of the variable value.

4. Run the following command on the command line to check whether Gradle is installed correctly.

   gradle -v
   

If the following is output, Gradle is properly installed. If you have any questions, see Gradle's official documentation.

------------------------------------------------------------
Gradle 4.1
------------------------------------------------------------
Build time:   2017-08-07 14:38:48 UTC
Revision:     941559e020f6c357ebb08d5c67acdb858a3defc2
Groovy:       2.4.11
Ant:          Apache Ant(TM) version 1.9.6 compiled on June 29 2015
JVM:          1.8.0_144 (Oracle Corporation 25.144-b01)
OS:           Windows 7 6.1 amd64

Preparing code

Preparing code file

1. Create a project folder in the selected location, such as scf_example.

2. In the root directory of the project folder, create a directory src/main/java/ as the directory where the package is stored.

3. Create an example package directory in the created directory and then create a Hello.java file in the package directory. The final directory structure is formed as follows:

   scf_example/src/main/java/example/Hello.java
   

4. Enter the following code content in the Hello.java file:

   package example;
   public class Hello {
   public String mainHandler(String name, Context context) {
       System.out.println("Hello world!");
       return String.format("Hello %s.", name);
   }
   }
   

Preparing compilation file

Create a build.gradle file in the root directory of the project folder and enter the following content:

apply plugin: 'java'
task buildZip(type: Zip) {
  from compileJava
  from processResources              
  into('lib') {
      from configurations.runtime
  }           
}
build.dependsOn buildZip

Using Maven Central library to handle package dependencies

If you need to reference the external package of Maven Central, you can add dependencies as needed. The content of the build.gradle file is as follows:

apply plugin: 'java'
repositories {
  mavenCentral()
}
dependencies {
  compile (
      'com.tencentcloudapi:scf-java-events:0.0.2'
  )
}
task buildZip(type: Zip) {
  from compileJava
  from processResources              
  into('lib') {
      from configurations.runtime
  }           
}
build.dependsOn buildZip

After repositories is used to indicate that the dependent library source is mavenCentral, Gradle will pull the dependencies from Maven Central during compilation, i.e., the com.tencentcloudapi:scf-java-events:0.0.2 package specified in dependencies.

Using local jar package to handle package dependencies

If you have already downloaded the Jar package to your local system, you can use the local library to handle package dependencies. In this case, create a jars directory in the root directory of the project folder and place the downloaded dependent Jar package into it. The content of the build.gradle file is as follows:

apply plugin: 'java'
dependencies {
  compile fileTree(dir: 'jars', include: '*.jar')
}
task buildZip(type: Zip) {
  from compileJava
  from processResources              
  into('lib') {
      from configurations.runtime
  }
}
build.dependsOn buildZip

After dependencies is used to indicate that the search directory is the *.jar file in the jars directory, the dependencies will be automatically searched for during compilation.

Compiling and packaging

Execute the command gradle build in the root directory of the project folder, and the compilation output should be like the example below:

Starting a Gradle Daemon (subsequent builds will be faster)
BUILD SUCCESSFUL in 5s
3 actionable tasks: 3 executed

If a compilation failure is displayed, adjust the code based on the outputted compilation error message.
The compiled zip package is located in the /build/distributions directory of the project folder and named scf_example.zip after the project folder.

Creating jar Deployment Package Using Maven

This document describes how to create a Java-type function deployment jar package with Maven.

Preparing environment

Make sure that you have Java and Gradle installed.

• For Java 11, install TencentKona 11 or JDK 11.
• For Java 8, install JDK 8. You can download and install the JDK appropriate for your system by using OpenJDK (Linux) or through Java.

Installing Maven

For Maven installation details, see Installing Apache Maven. The manual installation steps are as follows:

1. Download Maven's zip or tar.gz package.
2. Unzip the package to a desired directory, such as C:\Maven (Windows) or /opt/mvn/apache-maven-3.5.0 (Linux).
3. Add the path of the bin directory in the unzipped directory to the system environment variable PATH in the following way as appropriate:

• Linux: Add through export PATH=$PATH:/opt/mvn/apache-maven-3.5.0/bin.
• Windows: Right click Computer and select Properties > Advanced system settings > Advanced > Environment Variables, select the Path variable, click Edit, and add ;C:\Maven\bin; at the end of the variable value.

4. Run the following command on the command line to check whether Maven is installed correctly.

   mvn -v
   

If the following is output, Maven is properly installed. If you have any questions, see Maven's official documentation.

Apache Maven 3.5.0 (ff8f5e7444045639af65f6095c62210b5713f426; 2017-04-04T03:39:06+08:00)
Maven home: C:\Program Files\Java\apache-maven-3.5.0\bin\..
Java version: 1.8.0_144, vendor: Oracle Corporation
Java home: C:\Program Files\Java\jdk1.8.0_144\jre
Default locale: zh_CN, platform encoding: GBK
OS name: "windows 7", version: "6.1", arch: "amd64", family: "windows"

Preparing code

Preparing code file

1. Create a project folder in the selected location, such as scf_example.

2. In the root directory of the project folder, create a directory src/main/java/ as the directory where the package is stored.

3. Create an example package directory in the created directory and then create a Hello.java file in the package directory. The final directory structure is formed as follows:

   scf_example/src/main/java/example/Hello.java
   

4. Enter the following code content in the Hello.java file:

   package example;
   public class Hello {
   public String mainHandler(String name, Context context) {
       System.out.println("Hello world!");
       return String.format("Hello %s.", name);
   }
   }
   

Preparing compilation file

Create a pom.xml file in the root directory of the project folder and enter the following content:

<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/maven-v4_0_0.xsd">
  <modelversion>4.0.0</modelversion>

  <groupid>examples</groupid>
  <artifactid>java-example</artifactid>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>java-example</name>

  <build>
    <plugins>
      <plugin>
        <groupid>org.apache.maven.plugins</groupid>
        <artifactid>maven-shade-plugin</artifactid>
        <version>2.3</version>
        <configuration>
          <source>11
          <target>11</target>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

<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/maven-v4_0_0.xsd">
  <modelversion>4.0.0</modelversion>

  <groupid>examples</groupid>
  <artifactid>java-example</artifactid>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>java-example</name>

  <build>
    <plugins>
      <plugin>
        <groupid>org.apache.maven.plugins</groupid>
        <artifactid>maven-shade-plugin</artifactid>
        <version>2.3</version>
        <configuration>
          <createdependencyreducedpom>false</createdependencyreducedpom>
        </configuration>
        <executions>
          <execution>
            <phase>package</phase>
            <goals>
              <goal>shade</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Using Maven Central library to handle package dependencies

If you need to reference the external package of Maven Central, you can add dependencies as needed. The content of the pom.xml file is as follows. To add dependencies, pay attention to the <dependencies> section.

<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
 <groupId>examples</groupId>
<artifactId>java-example</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>java-example</name>

<dependencies>
  <dependency>
    <groupId>com.tencentcloudapi</groupId>
    <artifactId>scf-java-events</artifactId>
    <version>0.0.2</version>
  </dependency>
</dependencies>
 <build>
  <plugins>
    <plugin>
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-shade-plugin</artifactId>
      <version>2.3</version>
      <configuration>
        <createDependencyReducedPom>false</createDependencyReducedPom>
      </configuration>
      <executions>
        <execution>
          <phase>package</phase>
          <goals>
            <goal>shade</goal>
          </goals>
        </execution>
      </executions>
    </plugin>
  </plugins>
</build>
</project>

Compiling and packaging

Execute the command mvn package in the root directory of the project folder, and the compilation output should be like the example below:

[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building java-example 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.785 s
[INFO] Finished at: 2017-08-25T10:53:54+08:00
[INFO] Final Memory: 17M/214M
[INFO] ------------------------------------------------------------------------

If a compilation failure is displayed, adjust the code based on the outputted compilation error message.
The compiled zip package is located in the target directory of the project folder and named java-example-1.0-SNAPSHOT.jar after the artifactId and version fields in pom.xml.