Question

我有像这样的石英测试工作。

package com.example.spring.quartz.basic;

import org.quartz.Job;
import org.quartz.JobDataMap;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;

public class ExampleJob implements Job
{
    @Override
    public void execute(JobExecutionContext context) throws JobExecutionException
    {
        JobDataMap map = context.getMergedJobDataMap();
        String timeout = (String)map.get("timeout");

        System.out.println("ExampleJob.execute() " + timeout);
    }
}

这个作业是持久的，所以它被写入数据库，似乎Quartz将完整的合格作业类名com.example.spring.quartz.basic.ExampleJob写入数据库。

因此，如果重构将ExampleJob重命名为ExampleJob2，我最终会遇到以下异常，因为quartz会查找ExampleJob并获取未找到类的异常。

问题：是否有一些技巧或模式可以用来安全地重命名我的工作类不会导致现有的工作定义中断？

Exception in thread "main" org.springframework.context.ApplicationContextException: Failed to start bean 'quartzScheduler'; nested exception is org.springframework.scheduling.SchedulingException: Could not start Quartz Scheduler; nested exception is org.quartz.SchedulerConfigException: Failure occured during job recovery. [See nested exception: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.example.spring.quartz.basic.ExampleJob [See nested exception: java.lang.ClassNotFoundException: com.example.spring.quartz.basic.ExampleJob]]
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:170)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:51)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:339)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:143)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:108)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:945)
    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.example.spring.quartz.transactional.QuartzExampleJobMain.main(QuartzExampleJobMain.java:16)
Caused by: org.springframework.scheduling.SchedulingException: Could not start Quartz Scheduler; nested exception is org.quartz.SchedulerConfigException: Failure occured during job recovery. [See nested exception: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.example.spring.quartz.basic.ExampleJob [See nested exception: java.lang.ClassNotFoundException: com.example.spring.quartz.basic.ExampleJob]]
    at org.springframework.scheduling.quartz.SchedulerFactoryBean.start(SchedulerFactoryBean.java:715)
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:167)
    ... 9 more
Caused by: org.quartz.SchedulerConfigException: Failure occured during job recovery. [See nested exception: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.example.spring.quartz.basic.ExampleJob [See nested exception: java.lang.ClassNotFoundException: com.example.spring.quartz.basic.ExampleJob]]
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.schedulerStarted(JobStoreSupport.java:683)
    at org.quartz.core.QuartzScheduler.start(QuartzScheduler.java:526)
    at org.quartz.impl.StdScheduler.start(StdScheduler.java:143)
    at org.springframework.scheduling.quartz.SchedulerFactoryBean.startScheduler(SchedulerFactoryBean.java:649)
    at org.springframework.scheduling.quartz.SchedulerFactoryBean.start(SchedulerFactoryBean.java:712)
    ... 10 more
Caused by: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.example.spring.quartz.basic.ExampleJob [See nested exception: java.lang.ClassNotFoundException: com.example.spring.quartz.basic.ExampleJob]
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1524)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.recoverMisfiredJobs(JobStoreSupport.java:968)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.recoverJobs(JobStoreSupport.java:855)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$1.execute(JobStoreSupport.java:827)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport$46.execute(JobStoreSupport.java:3764)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3798)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3760)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.recoverJobs(JobStoreSupport.java:823)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.schedulerStarted(JobStoreSupport.java:681)
    ... 14 more
Caused by: java.lang.ClassNotFoundException: com.example.spring.quartz.basic.ExampleJob
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:270)
    at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:623)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1610)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1515)
    at java.io.ObjectInputStream.readClass(ObjectInputStream.java:1481)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1331)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1989)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1913)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at java.util.HashMap.readObject(HashMap.java:1155)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1989)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1913)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    at org.quartz.impl.jdbcjobstore.PostgreSQLDelegate.getObjectFromBlob(PostgreSQLDelegate.java:103)
    at org.quartz.impl.jdbcjobstore.StdJDBCDelegate.selectTrigger(StdJDBCDelegate.java:1764)
    at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1520)
    ... 22 more

Answer 1

遇到一个很好的问题。

是否有一些技巧

是的，诀窍是用新的细节重新定义你的工作。

检查this了解方法。

希望这能解决你的问题。

Answer 2

详细说明Sinchan的答案：

如果您有足够的数据来重新创建作业（即已将过期日期存档，请在许可证到期前30天通过电子邮件向员工发送提醒），请编写一个实用程序以取消计划/删除该类型的所有现有作业并重新创建它们新型。

否则：

重命名该类后，创建一个ExampleJob的空extends ExampleJob2类。这应该允许Quartz读入现有任务。
创建一个读取每个ExampleJob的实用程序，立即安排具有相同属性的相应ExampleJob2，并删除ExampleJob。
此时，您应该可以删除ExampleJob类。

如何为持久的Quartz Jobs重命名作业类？

2 个答案: