啟動dubbo報錯解決：java.lang.RuntimeException: java.io.IOException: invalid constant type: 15__dubbo

dubbo-2.8.4
JDK-1.8

啟動時報錯：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sysUserService': FactoryBean threw exception on object creation; nested exception is java.lang.RuntimeException: java.io.IOException: invalid constant type: 15

Caused by: java.lang.RuntimeException: java.io.IOException: invalid constant type: 15

折騰了很久，查閱部落格說是jdk版本不對，修改成了jdk1.6、jdk1.7仍然還是報錯。

最終解決：
是因為dubbo調用的javassist-3.15.0-GA.jar和JDK版本衝突，將引用的包改為javassist-3.18.0-GA，成功解決。

原帖:http://www.xwood.net/_site_domain_/_root/5870/5874/t_c258488.html

然後啟動出現新的異常：

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sysUserService' defined in file [D:\WorkSpace\MATHVER\dc-sys-service\target\classes\dc\sys\service\SysUserService.class]: Initialization of bean failed; nested exception is org.I0Itec.zkclient.exception.ZkTimeoutException: Unable to connect to zookeeper server within timeout: 5000

測試發現zookeeper伺服器已啟動，可以使用zkCli.sh訪問伺服器，但這裡卻無法串連。

原因版本衝突，將引用的zookeeper-3.4.5.jar換成zookeeper-3.4.6，啟動不再報錯。