sqldeveloper 报The Network Adapter could not establish
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如图：（选自网上，忘了截图了） 
理解错误意思：
Network Adapter 网络适配器
could not establish the connection 不能建立连接
就是数据库连接异常。通常都是监听服务没启动啊，参数配置不正确啊。
但是我连接的远程的oracle.并且参数配置正确。
最后更换jdk 1.6，成功解决问题。
sqldeveloper 是4.0.0.12
更换1.6出现这个
直接确定，跳过，不影响。
不明白原因，解决方法提供更参考
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