2

我有一个像这样的测试石英工作。

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);
    }
}

该作业是持久的，因此它被写入数据库，并且 Quartz 似乎将完整的限定作业类名称写入com.example.spring.quartz.basic.ExampleJob数据库。

因此，如果重构重命名为ExampleJob，ExampleJob2我最终会出现以下异常，因为石英会查找 ExampleJob 并获得一个类未找到异常。

问题：我可以使用一些技巧或模式来安全地重命名我的作业类而不导致现有作业定义中断吗？ 

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
4

2 回答 2

0

遇到一个很好的问题。

有没有什么诀窍

是的，诀窍是用新的细节重新定义你的工作。

检查这个如何。

希望这能解决您的问题。

于 2013-07-21T04:57:23.610 回答
0

详细说明Sinchan的答案：

如果您有足够的数据来重新创建工作（即过期日期已存档，请在许可证过期前 30 天通过电子邮件向员工发送提醒），请编写一个实用程序来取消计划/删除该类型的所有现有工作并使用新的重新创建它们类型。

否则：

  1. 重命名类后，创建一个空ExampleJob类extends ExampleJob2。这应该允许 Quartz 读取现有任务。
  2. 创建一个实用程序，读取每个ExampleJob，立即安排ExampleJob2具有相同属性的对应，并删除ExampleJob.
  3. 此时，您应该能够删除ExampleJob该类。
于 2018-01-16T17:30:39.640 回答