Spring Boot + Zookeeper + Dubbo + Seata 整合后，打jar包无法启动

• 前言

Spring Boot + Zookeeper + Dubbo + Seata 整合，IDEA启动项目报错，在tomcat中则可以运行。

• 版本：
  • Zookeeper 3.6.1
  • Dubbo 3.7
  • Seata 1.4  
• 报错异常信息

22:36:01.157 [restartedMain] WARN  o.a.c.l.WebappClassLoaderBase - [log,173] - The web application [ROOT] appears to have started a thread named [Druid-ConnectionPool-Destroy-92732034] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:

 java.lang.Thread.sleep(Native Method)

 com.alibaba.druid.pool.DruidDataSource$DestroyConnectionThread.run(DruidDataSource.java:2641)

22:36:01.159 [restartedMain] WARN  o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext - [refresh,554] - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat

22:36:01.182 [restartedMain] ERROR o.s.b.SpringApplication - [reportFailure,858] - Application run failed

org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:157)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540)

    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)

    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)

    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)

    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)

    at com.xuanzhen.CouponApplication.main(CouponApplication.java:27)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)

Caused by: org.springframework.aop.framework.AopConfigException: Could not generate CGLIB subclass of class com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper: Common causes of this problem include using a final class or a non-visible class; nested exception is org.springframework.cglib.core.CodeGenerationException: java.lang.IllegalAccessError-->class com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper$$EnhancerBySpringCGLIB$$3ec0b0c8 cannot access its superclass com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper

    at org.springframework.aop.framework.CglibAopProxy.getProxy(CglibAopProxy.java:208)

    at org.springframework.aop.framework.ProxyFactory.getProxy(ProxyFactory.java:110)

    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.createProxy(AbstractAutoProxyCreator.java:473)

    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.wrapIfNecessary(AbstractAutoProxyCreator.java:352)

    at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessAfterInitialization(AbstractAutoProxyCreator.java:301)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:434)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1749)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:576)

    ... 152 common frames omitted

Caused by: java.lang.IllegalAccessError: class com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper$$EnhancerBySpringCGLIB$$3ec0b0c8 cannot access its superclass com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceWrapper

    at java.lang.ClassLoader.defineClass1(Native Method)

    at java.lang.ClassLoader.defineClass(ClassLoader.java:763)

    at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.springframework.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:523)

    ... 173 common frames omitted

Process finished with exit code 0

项目maven依赖

<dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.1.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
		<dependency>
			<groupId>io.seata</groupId>
			<artifactId>seata-spring-boot-starter</artifactId>
			<version>1.4.0</version>
		<dependency>
			<groupId>com.101tec</groupId>
			<artifactId>zkclient</artifactId>
			<version>0.11</version>
		</dependency>
           

尝试使用网上的方式解决，排除 servlet-api、guava、tomcat依赖冲突等等，均没有解决。

• 解决

最后，将 Seata客户端配置文件中默认为 false 的 use-jdk-proxy 改为 true，问题解决。原因后续分析。

seata:
  enabled: true
  application-id: coupon
  tx-service-group: my_test_tx_group
  enable-auto-data-source-proxy: true
  data-source-proxy-mode: AT
  use-jdk-proxy: true
  excludes-for-auto-proxying: firstClassNameForExclude,secondClassNameForExclude
......