- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- User Guide
- Quota Management
- Managing Functions
- Web Function Management
- Log Management
- Concurrence Management
- Trigger Management
- A Custom Domain Name
- Version Management
- Alias Management
- Permission Management
- Managing Monitors and Alarms
- Network Configuration
- Layer Management
- Execution Configuration
- Extended Storage Management
- DNS Caching Configuration
- Resource Managed Mode Management
- Triggers
- Development Guide
- Developer Tools
- Code Development
- Web Framework Development
- Deploying Framework on Command Line
- Quickly Deploying Egg Framework
- Quickly Deploying Express Framework
- Quickly Deploying Flask Framework
- Quickly Deploying Koa Framework
- Quickly Deploying Laravel Framework
- Quickly Deploying Nest.js Framework
- Quickly Deploying Next.js Framework
- Quickly Deploying Nuxt.js Framework
- Quickly Deploying Django Framework
- Practical Tutorial
- Overview
- Solutions with Tencent Cloud Services
- Business Development
- ServerlessFramework Practices
- API Gateway
- TRTC Practices
- COS Practices
- CKafka Practice
- CLS
- CLB Practice
- MPS
- CDN
- CDWPG
- VOD
- SMS
- ES
- Scheduled Task
- Video Processing
- Success Stories
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Trigger APIs
- Function APIs
- CopyFunction
- Invoke
- UpdateFunctionConfiguration
- UpdateFunctionCode
- ListFunctions
- GetFunctionLogs
- GetFunction
- DeleteFunction
- CreateFunction
- PublishVersion
- ListVersionByFunction
- GetFunctionAddress
- DeleteAlias
- UpdateAlias
- ListAliases
- GetAlias
- CreateAlias
- PutTotalConcurrencyConfig
- PutReservedConcurrencyConfig
- PutProvisionedConcurrencyConfig
- GetReservedConcurrencyConfig
- GetProvisionedConcurrencyConfig
- DeleteReservedConcurrencyConfig
- DeleteProvisionedConcurrencyConfig
- UpdateFunctionEventInvokeConfig
- GetFunctionEventInvokeConfig
- InvokeFunction
- GetRequestStatus
- Namespace APIs
- Layer Management APIs
- Async Event Management APIs
- Other APIs
- Function and Layer Status Description
- Data Types
- Error Codes
- SDK Documentation
- FAQs
- Related Agreement
- Contact Us
- Glossary
- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- User Guide
- Quota Management
- Managing Functions
- Web Function Management
- Log Management
- Concurrence Management
- Trigger Management
- A Custom Domain Name
- Version Management
- Alias Management
- Permission Management
- Managing Monitors and Alarms
- Network Configuration
- Layer Management
- Execution Configuration
- Extended Storage Management
- DNS Caching Configuration
- Resource Managed Mode Management
- Triggers
- Development Guide
- Developer Tools
- Code Development
- Web Framework Development
- Deploying Framework on Command Line
- Quickly Deploying Egg Framework
- Quickly Deploying Express Framework
- Quickly Deploying Flask Framework
- Quickly Deploying Koa Framework
- Quickly Deploying Laravel Framework
- Quickly Deploying Nest.js Framework
- Quickly Deploying Next.js Framework
- Quickly Deploying Nuxt.js Framework
- Quickly Deploying Django Framework
- Practical Tutorial
- Overview
- Solutions with Tencent Cloud Services
- Business Development
- ServerlessFramework Practices
- API Gateway
- TRTC Practices
- COS Practices
- CKafka Practice
- CLS
- CLB Practice
- MPS
- CDN
- CDWPG
- VOD
- SMS
- ES
- Scheduled Task
- Video Processing
- Success Stories
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Trigger APIs
- Function APIs
- CopyFunction
- Invoke
- UpdateFunctionConfiguration
- UpdateFunctionCode
- ListFunctions
- GetFunctionLogs
- GetFunction
- DeleteFunction
- CreateFunction
- PublishVersion
- ListVersionByFunction
- GetFunctionAddress
- DeleteAlias
- UpdateAlias
- ListAliases
- GetAlias
- CreateAlias
- PutTotalConcurrencyConfig
- PutReservedConcurrencyConfig
- PutProvisionedConcurrencyConfig
- GetReservedConcurrencyConfig
- GetProvisionedConcurrencyConfig
- DeleteReservedConcurrencyConfig
- DeleteProvisionedConcurrencyConfig
- UpdateFunctionEventInvokeConfig
- GetFunctionEventInvokeConfig
- InvokeFunction
- GetRequestStatus
- Namespace APIs
- Layer Management APIs
- Async Event Management APIs
- Other APIs
- Function and Layer Status Description
- Data Types
- Error Codes
- SDK Documentation
- FAQs
- Related Agreement
- Contact Us
- Glossary
Java Version Selection
Currently, SCF supports the following versions of Java programming language:
Java 11 (Kona JDK)
Java 8 (Open JDK)
You can choose Java 8 or Java 11 as the runtime environment when creating a function.
SCF Java 11 is provided based on Tencent Kona. Tencent Kona is based on OpenJDK and maintained, optimized, and safeguarded by Tencent's professional technical team. The Tencent Cloud team has further developed and optimized Kona's support and features in cloud scenarios, making it more suitable for Java cloud businesses and delivering the best Java cloud production environment and solution.
Environment Variables
The environment variables built in the Java 8 and Java 11 runtime environments are as shown in the table below:
Java 11
Environment Variable Key | Specific Value or Value Source |
CLASSPATH | /var/runtime/java11:/var/runtime/java11/lib/* |
Java 8
Environment Variable Key | Specific Value or Value Source |
CLASSPATH | /var/runtime/java8:/var/runtime/java8/lib/*:/opt |
Notes
As the Java language can be executed in JVM only after compilation, it is used in SCF in a different way from scripting languages such as Python and Node.js, with the following restrictions:
Code upload is not supported: When Java is used, only developed, compiled, and packaged ZIP or JAR packages can be uploaded. The SCF environment does not provide Java compiling capability.
Online editing is not supported: Because code cannot be uploaded, online code editing is not supported. The code page of a Java runtime function only lists the ways to upload the code through the page or submit the code through COS.
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