最近在研究阿里的分布式事务框架GTS，在运行sample-txc-simple时，抛以下异常：
JM.Log:INFO Set diamond-client log path: C:\Users\chanson\logs\diamond-client
Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: org.apache.http.client.HttpClient
at com.taobao.txc.common.config.ConsoleConfig.g(Unknown Source)
at com.taobao.txc.common.config.ConsoleConfig.<init>(Unknown Source)
at com.taobao.txc.common.config.ConsoleConfig.a(Unknown Source)
at com.taobao.txc.common.config.o.a(Unknown Source)
at com.taobao.txc.common.config.o.a(Unknown Source)
at com.taobao.txc.common.LoggerWrap.a(Unknown Source)
at com.taobao.txc.common.config.o.a(Unknown Source)
at com.taobao.txc.client.a.a(Unknown Source)
at com.taobao.txc.client.a.<init>(Unknown Source)
at com.taobao.txc.client.a.a(Unknown Source)
at com.taobao.txc.client.aop.TxcTransactionScaner.a(Unknown Source)
at com.taobao.txc.client.aop.TxcTransactionScaner.onApplicationEvent(Unknown Source)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:96)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:334)
at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:954)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.taobao.txc.test.Simple.main(Simple.java:39)
Caused by: java.lang.ClassNotFoundException: org.apache.http.client.HttpClient
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)解决方案：
把pom.xml文件中的httpclient版本调高到4.5.3即可。
...
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.3</version>
</dependency>
...sample-txc-dubbo工程也有一样的问题，依次修改即可。