Linux启动jar包出现 quartz异常之：org.quartz.SchedulerException

异常如下：

1	2018-01-30 14:23:47.234 ERROR 6101 --- [main] org.quartz.impl.StdSchedulerFactory      : Couldn't generate instance Id!

org.quartz.SchedulerException: Couldn't get host name!
at org.quartz.simpl.SimpleInstanceIdGenerator.generateInstanceId(SimpleInstanceIdGenerator.java:36)
at org.quartz.impl.StdSchedulerFactory.instantiate(StdSchedulerFactory.java:1211)
at org.quartz.impl.StdSchedulerFactory.getScheduler(StdSchedulerFactory.java:1519)
at org.springframework.scheduling.quartz.SchedulerFactoryBean.createScheduler(SchedulerFactoryBean.java:597)
at org.springframework.scheduling.quartz.SchedulerFactoryBean.afterPropertiesSet(SchedulerFactoryBean.java:480)
...

Caused by: java.net.UnknownHostException: WLSHASRV007: WLSHASRV007: 域名解析暂时失败
at java.net.InetAddress.getLocalHost(InetAddress.java:1505)
at org.quartz.simpl.SimpleInstanceIdGenerator.generateInstanceId(SimpleInstanceIdGenerator.java:34)
... 108 common frames omitted

    很糟糕，第一次碰到，查看了项目中的各处配置文件都没问题，最后 google 给我解决了，原来是 org.quartz.simpl.SimpleInstanceIdGenerator 中获取主机名异常了。

    下面是源码：

public class SimpleInstanceIdGenerator implements InstanceIdGenerator {
  public String generateInstanceId() throws SchedulerException {
     try {
        return InetAddress.getLocalHost().getHostName() + System.currentTimeMillis();
     } catch (Exception e) {
        throw new SchedulerException("Couldn't get host name!", e);
     }
  }
}

二、解决

    其实解决是很简单，

    ① 查看主机名：

[root@WLSHASRV007 ~]# hostname
WLSHASRV007

    ② 查看 hosts 文件（可以先使用 cat /etc/hosts进行查看），vi /etc/hosts ，确保无乱码等异常，并确认 127.0.0.1 后面有上命令查询出的主机名

    

    ③ 如图，发现没有，则添加即可