4

我希望你们中的一个可爱的人能够帮助我解决这个问题，因为我已经花了很多时间试图让一切都变得美好！

我已经将问题追溯到 Classloading，并且能够看到当 Quartz 尝试从 jobStore (jobStoreCMT) 反序列化 jobDetail 时，使用的 Classloader 不包含我的任何应用程序类，并且仅包含在EARs 库文件夹。

所以......我显然正在使用应用程序服务器，在这种情况下尝试针对 Glassfish 3.1.1/3.1.2

尝试使用 Spring 3.1.0.RELEASE 对抗 Quartz 1.8.6/2.1.5

弹簧/石英配置：

<bean id="schedulerFactoryBean" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="overwriteExistingJobs" value="true" />

    <property name="triggers">
        <list>
            <ref bean="notificationEmailsSimpleTrigger" />
        </list>
    </property>

    <property name="quartzProperties">
        <props>
            <prop key="org.quartz.scheduler.instanceName">QuartzScheduler</prop>
            <prop key="org.quartz.scheduler.instanceId">AUTO</prop>

            <prop key="org.quartz.threadPool.class">org.quartz.simpl.SimpleThreadPool</prop>
            <prop key="org.quartz.threadPool.threadCount">25</prop>
            <prop key="org.quartz.threadPool.threadPriority">5</prop>
            <prop key="org.quartz.jobStore.class">org.quartz.impl.jdbcjobstore.JobStoreCMT</prop>
            <prop key="org.quartz.jobStore.driverDelegateClass">org.quartz.impl.jdbcjobstore.StdJDBCDelegate</prop>
            <prop key="org.quartz.jobStore.misfireThreshold">60000</prop>
            <prop key="org.quartz.jobStore.tablePrefix">QRTZ_</prop>
            <!-- <prop key="org.quartz.jobStore.isClustered">true</prop> -->
            <!-- <prop key="org.quartz.jobStore.clusterCheckinInterval">20000</prop> -->

            <prop key="org.quartz.scheduler.classLoadHelper.class">org.quartz.simpl.CascadingClassLoadHelper</prop>
            <prop key="org.quartz.scheduler.threadsInheritContextClassLoaderOfInitializer">true</prop>
            <prop key="org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread">true</prop>

            <prop key="org.quartz.scheduler.skipUpdateCheck">true</prop>
        </props>
    </property>
</bean>

以及相应的触发器参考：

<bean id="notificationEmailsSimpleTrigger" class="org.springframework.scheduling.quartz.SimpleTriggerFactoryBean">
    <property name="jobDetail" ref="notificationJobDetail" />
    <property name="repeatInterval" value="60000" />
</bean>

<bean id="notificationJobDetail" class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
    <property name="jobClass" value="com.mcboom.social.notifications.NotificationQuartzJobBean" />
</bean>

所以我遇到的问题是：下面的任何组合似乎都不会影响正在使用的类加载器。

    <prop key="org.quartz.scheduler.classLoadHelper.class">org.quartz.simpl.CascadingClassLoadHelper</prop>
    <prop key="org.quartz.scheduler.threadsInheritContextClassLoaderOfInitializer">true</prop>
    <prop key="org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread">true</prop>

或者更具体地说，在尝试检索以前持久的触发器时没有帮助，导致以下 stracktrace：

INFO: ERROR - ErrorLogger.schedulerError(schedulerFactoryBean_QuartzSchedulerThread)(2358) | An error occured while scanning for the next trigger to fire.
org.quartz.JobPersistenceException: Couldn't acquire next trigger: Couldn't retrieve trigger: com.mcboom.social.notifications.NotificationQuartzJobBean [See nested exception: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.mcboom.social.notifications.NotificationQuartzJobBean [See nested exception: java.lang.ClassNotFoundException: com.mcboom.social.notifications.NotificationQuartzJobBean]]
at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2814)
at org.quartz.impl.jdbcjobstore.JobStoreSupport$36.execute(JobStoreSupport.java:2757)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.executeInNonManagedTXLock(JobStoreSupport.java:3788)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2753)
at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:263)
Caused by: org.quartz.JobPersistenceException: Couldn't retrieve trigger: com.mcboom.social.notifications.NotificationQuartzJobBean [See nested exception: java.lang.ClassNotFoundException: com.mcboom.social.notifications.NotificationQuartzJobBean]
at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1596)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.retrieveTrigger(JobStoreSupport.java:1572)
at org.quartz.impl.jdbcjobstore.JobStoreSupport.acquireNextTrigger(JobStoreSupport.java:2792)
... 4 more

我可以看到org.quartz.simpl.CascadingClassLoadHelper在加载时使用，并正确选择了正确的类加载器。

问题是，当QuartzSchedulerThread尝试检索触发器时，它使用JobStoreSupport.retrieveTrigger()，而后者又回退到ObjectInputsStream.resolveClass()和以下代码行：

Class.forName(name, false, latestUserDefinedLoader())

latestUserDefinedLoader ()总是返回错误的类加载器......导致 ClassNotFoundException 让我很困惑！

我应该指出latestUserDefinedLoader()是 ObjectInputsStream 的本机方法，我在 OSX 上使用 jdk 1.6。

来自 Quartz/Spring 或更可能是 Glassfish 社区的任何人都可以对此有所了解吗？我现在正在拔头发。

谢谢史蒂夫。

4

2 回答 2

5

如果有人对我提出的解决方案感兴趣，虽然并不理想是扩展默认值StdJDBCDelegate，在我的情况下，对于 MySQL，我可以ObjectInputStream.resolveClass()像下面这样匿名覆盖。

/**
 * <p>
 * This method should be overridden by any delegate subclasses that need
 * special handling for BLOBs. The default implementation uses standard JDBC
 * <code>java.sql.Blob</code> operations.
 * </p>
 * 
 * <p>
 * This implementation overcomes the incorrect classloader being used in
 * ObjectInputStream, overriding it with the current threads classloader.
 * </p>
 * 
 * @param rs
 *            the result set, already queued to the correct row
 * @param colName
 *            the column name for the BLOB
 * @return the deserialized Object from the ResultSet BLOB
 * @throws ClassNotFoundException
 *             if a class found during deserialization cannot be found
 * @throws IOException
 *             if deserialization causes an error
 */
@Override
protected Object getObjectFromBlob(ResultSet rs, String colName) throws ClassNotFoundException, IOException, SQLException {
    Object obj = null;

    Blob blobLocator = rs.getBlob(colName);
    if (blobLocator != null && blobLocator.length() != 0) {
        InputStream binaryInput = blobLocator.getBinaryStream();

        if (null != binaryInput) {
            if (binaryInput instanceof ByteArrayInputStream && ((ByteArrayInputStream) binaryInput).available() == 0) {
                // do nothing
            } else {
                ObjectInputStream in = new ObjectInputStream(binaryInput) {

                    @Override
                    protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
                        String name = desc.getName();
                        try {
                            return Class.forName(name, false, Thread.currentThread().getContextClassLoader());
                        } catch (ClassNotFoundException ex) {
                            return super.resolveClass(desc);
                        }
                    }
                };

                try {
                    obj = in.readObject();
                } finally {
                    in.close();
                }
            }
        }

    }
    return obj;
}

使用当前线程类加载器，如果不成功则回退到默认处理。

如果有人有更好的解决方案，甚至可以解释为什么首先会出现问题，我会非常有兴趣听到。

S。

于 2012-05-28T16:51:09.130 回答
2

org.springframework.scheduling.quartz.JobDetailBean改为使用org.springframework.scheduling.quartz.JobDetailFactoryBean

于 2012-05-22T17:55:34.207 回答