Dependencies

Necessary dependencies

必要的依赖

JDK 1.6+ ¹

Default dependencies

默认依赖

use mvn dependency:tree > dep.log command to analysis，Dubbo default depends on the following 3^rd party libraries：

使用命令 mvn dependency:tree > dep.log 去分析，Dubbo默认依赖以下第三方库：

[INFO] +- com.alibaba:dubbo:jar:2.5.9-SNAPSHOT:compile
[INFO] |  +- org.springframework:spring-context:jar:4.3.10.RELEASE:compile
[INFO] |  +- org.javassist:javassist:jar:3.21.0-GA:compile
[INFO] |  - org.jboss.netty:netty:jar:3.2.5.Final:compile

All dependencies here are selected for the default configuration of the Dubbo, which are based on stability and performance considerations.

这里所有的依赖都是dubbo选择的默认配置，都是基于稳定性和性能考虑的。

javassist.jar ³: if <dubbo:provider proxy="jdk" /> or <dubbo:consumer proxy="jdk" />，or <dubbo:application compiler="jdk" />， is not required.
spring-context.jar ⁴: If you are using ServiceConfig and ReferenceConfig API calls, is not required.
netty.jar ⁵: if <dubbo:protocol server="mina"/> or <dubbo:protocol server="grizzly"/>，Then change to mina.jar or grizzly.jar. If <protocol name="rmi"/>， is not required.

Optinal dependencies

可选的依赖

These dependencies needs to be added to project manually，when you need them.

当需要的时候，这些依赖需要手动添加到项目中：

netty-all 4.0.35.Final
mina: 1.1.7
grizzly: 2.1.4
httpclient: 4.5.3
hessian_lite: 3.2.1-fixed
fastjson: 1.2.31
zookeeper: 3.4.9
jedis: 2.9.0
xmemcached: 1.3.6
hessian: 4.0.38
jetty: 6.1.26
hibernate-validator: 5.4.1.Final
zkclient: 0.2
curator: 2.12.0
cxf: 3.0.14
thrift: 0.8.0
servlet: 3.0 ⁶
validation-api: 1.1.0.GA ⁶
jcache: 1.0.0 ⁶
javax.el: 3.0.1-b08 ⁶
kryo: 4.0.1
kryo-serializers: 0.42
fst: 2.48-jdk-6
resteasy: 3.0.19.Final
tomcat-embed-core: 8.0.11
slf4j: 1.7.25
log4j: 1.2.16

In theory, Dubbo only depend on JDK, not depend on any 3^rd party libs, you can finish logic by using JDK. ↩ 理论上，dubbo只需要依赖JDK，不依赖任何第三方库，你可以使用JDK完成逻辑。
Log output jar ↩ 日志输出jar
Bytecode generation ↩ 字节生成
Configuration parsing ↩ 配置解析
Network transmission ↩ 网络传输
JAVAEE ↩↩↩↩