启动dubbo报错解决：java.lang.RuntimeException: java.io.IOException: invalid constant type: 15

dubbo-2.8.4
JDK-1.8

启动时报错：

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

折腾了很久，查阅博客说是jdk版本不对，修改成了jdk1.6、jdk1.7仍然还是报错。

最终解决：
是因为dubbo调用的javassist-3.15.0-GA.jar和JDK版本冲突，将引用的包改为javassist-3.18.0-GA，成功解决。

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

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然后启动出现新的异常：

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

测试发现zookeeper服务器已启动，可以使用zkCli.sh访问服务器，但这里却无法连接。

原因版本冲突，将引用的zookeeper-3.4.5.jar换成zookeeper-3.4.6，启动不再报错。