一个java类实现了StatefulJob后，再继承就无法启动定时器

[灰毛狮王]

//public class TimerByFourAccess extends XMLWriter implements StatefulJob { //继承后定时器不执行
public class TimerByFourAccess implements StatefulJob { //定时器可以执行


是这样的，我想在我的定时器里面继承XMLWriter这个类，但是一旦继承后，weblogic配置的定时器任务就会失效，我想知道这是为什么，

<?xml version="1.0" encoding="UTF-8"?>
<quartz>


<job>
<job-detail>
<name>SyncMoveCaseFile</name>
<group>DEFAULT</group>
<description>
A job that prints out some basic information.
</description>
<job-class>
com.sdf.workflosdfw.sdf.file.MoveCaseFile
</job-class>
<volatility>false</volatility>
<durability>false</durability>
<recover>false</recover>
</job-detail>
<trigger>
<cron>
<name>TSyncMoveCaseFilep</name>
<group>DEFAULT</group>
<job-name>SyncMoveCaseFile</job-name>
<job-group>DEFAULT</job-group>
<cron-expression>0/30 * * * * ?</cron-expression>
</cron>
</trigger>
</job>


</quartz>

[灰毛狮王]

[ERROR]:2017-12-22 21:54:00 -- An error occured instantiating job to be executed. job= 'DEFAULT.TimerByFourAccess' org.quartz.SchedulerException: Problem instantiating class 'com.agile.tool.timer.TimerByFourAccess' [See nested exception: java.lang.InstantiationException: com.agile.tool.timer.TimerByFourAccess] at org.quartz.simpl.SimpleJobFactory.newJob(SimpleJobFactory.java:52) at org.quartz.core.JobRunShell.initialize(JobRunShell.java:133) at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:353) * Nested Exception (Underlying Cause) --------------- java.lang.InstantiationException: com.asde.tool.timer.TimerByFourAccess at java.lang.Class.newInstance0(Class.java:342) at java.lang.Class.newInstance(Class.java:310) at org.quartz.simpl.SimpleJobFactory.newJob(SimpleJobFactory.java:50) at org.quartz.core.JobRunShell.initialize(JobRunShell.java:133) at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:353)

[wuzhou2222]

小白一只，帮顶一下 顺便学习