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new 38bfe24 dubbo 2.7.14 with java 17 (#993)
38bfe24 is described below
commit 38bfe24796965d4ca261757c677f9ea71d5df668
Author: rikaaa0928 <[email protected]>
AuthorDate: Sat Dec 11 17:03:04 2021 +0800
dubbo 2.7.14 with java 17 (#993)
Co-authored-by: 王志东 <[email protected]>
---
content/zh/blog/news/dubbo2.7.14-java17.md | 77 ++++++++++++++++++++++++++++++
1 file changed, 77 insertions(+)
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b/content/zh/blog/news/dubbo2.7.14-java17.md
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+---
+title: "使用jdk17编译运行dubbo 2.7.14项目"
+linkTitle: "使用jdk17编译运行dubbo 2.7.14项目"
+date: 2018-08-07
+description: >
+ 本文介绍了如何在jdk17环境下编译运行dubbo 2.7.14项目。
+---
+## 概述
+java 17是java目前最新的长期支持(LTS)版本，但是由于其强封装 JDK 的内部
API的新特性，导致dubbo项目无法直接使用jdk17编译运行。通过参考[openjdk的说明](https://openjdk.java.net/jeps/403)，可以发现只需要添加相应参数即可绕开java
17的限制
+对于普通的dubbo项目，只需要在运行时添加
+```--add-opens java.base/java.lang=ALL-UNNAMED --add-opens
java.base/sun.reflect.generics.reflectiveObjects=ALL-UNNAMED --add-opens
java.base/java.math=ALL-UNNAMED```
+如上参数即可。如果项目的其它依赖也有类似问题则可能需要加入更多参数，参数的获得方式和详细示例将在下面给出
+本解决方案只能解决由于java 17强封装 JDK 的内部 API的特性造成的问题，其他的兼容性问题请寻找其它方案
+## 参数的获得方法和示例
+我们以dubbo官方仓库中的demo为例
+首先使用java 17作为我们的开发环境，通过
+```
+git clone [email protected]:apache/dubbo.git
+git checkout dubbo-2.7.14
+cd dubbo-demo/dubbo-demo-annotation
+```
+获得dubbo官方仓库的代码中的demo，然后可以尝试直接使用java 17编译dubbo的demo
+确认java版本
+```
+➜ ~ java -version
+openjdk version "17.0.1" 2021-10-19
+OpenJDK Runtime Environment Temurin-17.0.1+12 (build 17.0.1+12)
+OpenJDK 64-Bit Server VM Temurin-17.0.1+12 (build 17.0.1+12, mixed mode,
sharing)
+```
+然后运行
+```
+mvn -U clean package --no-transfer-progress -D maven.test.skip=true
+```
+启动zookeeper `docker run --name some-zookeepep -p 2181:2181 -it --rm zookeeper`
作为注册中心
+尝试运行provider
+```
+java -jar
dubbo-demo-annotation-provider/target/dubbo-demo-annotation-provider-2.7.14.jar
+```
+可以看到类似的报错:
+```Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make
protected final java.lang.Class
java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
throws java.lang.ClassFormatError accessible: module java.base does not "opens
java.lang" to unnamed module @8807e25```
+关键词 `module `**java.base**` does not "opens `**java.lang**`" to unnamed module
@8807e25`，根据[openjdk的说明](https://openjdk.java.net/jeps/403)，我们只需要添加`--add-opens
`**java.base**`/`**java.lang**`=ALL-UNNAMED`参数即可解决问题
+对应的报错应该都可以用类似得方法去解决，经过测试，demo中的dubbo项目需要
+```
+--add-opens java.base/java.lang=ALL-UNNAMED --add-opens
java.base/sun.reflect.generics.reflectiveObjects=ALL-UNNAMED --add-opens
java.base/java.math=ALL-UNNAMED
+```
+如上参数即可运行
+在两个终端中分别运行provider和consumer:
+```
+java --add-opens java.base/java.lang=ALL-UNNAMED --add-opens
java.base/sun.reflect.generics.reflectiveObjects=ALL-UNNAMED --add-opens
java.base/java.math=ALL-UNNAMED -jar
dubbo-demo-annotation-provider/target/dubbo-demo-annotation-provider-2.7.14.jar
+```
+```
+java --add-opens java.base/java.lang=ALL-UNNAMED --add-opens
java.base/sun.reflect.generics.reflectiveObjects=ALL-UNNAMED --add-opens
java.base/java.math=ALL-UNNAMED -jar
dubbo-demo-annotation-consumer/target/dubbo-demo-annotation-consumer-2.7.14.jar
+```
+可以发现报出了zookeeper的错误，不难想到，升级依赖的zookeeper的版本大概率可以解决问题...
+在provider和consumer的 `pom.xml` 的依赖第一项添加最新版本的zookeeper依赖:
+```
+ <dependency>
+ <groupId>org.apache.zookeeper</groupId>
+ <artifactId>zookeeper</artifactId>
+ <version>3.7.0</version>
+ <exclusions>
+ <exclusion>
+ <groupId>io.netty</groupId>
+ <artifactId>netty</artifactId>
+ </exclusion>
+ </exclusions>
+ </dependency>
+```
+再次运行provider和consumer
+可以看到consumer端成功输出了类似的结果
+```
+result :Hello world, response from provider: *.*.*.*/<unresolved>:20880
+```
+provider端也有对应的日志
+```
+Hello world, request from consumer: /*.*.*.*:43346
+```
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