Spring 使用+;弹簧&x2B;Struts应用程序
在我的应用程序中,ehcache的配置如下所示 AppDataRegion.javaSpring 使用+;弹簧&x2B;Struts应用程序,spring,caching,ehcache,spring-4,Spring,Caching,Ehcache,Spring 4,在我的应用程序中,ehcache的配置如下所示 AppDataRegion.java //import statements. public class AppDataRegion{ //Variable for region identifier. private String appRegionId; // constructor sets the appRegionId; //obtained from the system current time. public AppDataR
//import statements.
public class AppDataRegion{
//Variable for region identifier.
private String appRegionId;
// constructor sets the appRegionId;
//obtained from the system current time.
public AppDataRegion(){
appRegionId = String.valueOf(System.currentTimeMillis());
}
//Variable for cachemanager
// injected by spring DI from context xml
Private CacheManager appCacheMngr;
//necessary getter / setter methods for variable cachemanager
//necessary getter / setter methods for variable appRegionId
//method to create a region in cache using the appRegionId value
private createRegion(){
if (!appCacheMngr.cacheExists(appRegionId)){
try {
appCacheMngr.addCache(appRegionId);
catch (exc){
//exception handled
}
}
}
public Cache getRegion(){
if(appCacheMngr == null || !appCacheMngr.cacheExists(appRegionId)){
createRegion();
}
return appCacheMangr.getCache(appRegionId);
}
private createCustRegion(){
try{
Cache custCache = appCacheMngr.getCache(“custdiskCache”);
If(null == custCache.addCache(custCache);
}catch (exp){
//handled the exceptions
}
retrun appCacheMngr.getCache(“custdiskCache”);
}
}
弹簧配置
<bean id="appDataStoreService" class="com.app.cache.AppDataStoreService" >
<property name="appDataStoreRegion" ref="appDataStoreRegion"/>
</bean>
<bean id="appDataStoreRegion" class="com.app.cache.AppDataStoreRegion">
<property name="appcacheManager" ref="cacheManager"/>
</bean>
<bean id="cacheManager" class="net.sf.ehcache.CacheManager" factory-method="create">
<constructor-arg index="0" type="java.net.URL" value="classpath:ehcache-app.xml" />
</bean>
在应用程序中,在DTO对象中填充数据后,我调用appDataStoreService类的storeCustObjInCache()方法将内容写入磁盘
ehcache配置为单例而不是实例
web应用程序使用struts(2.3.20)框架进行web流,使用Spring框架(4.1.2)进行DI对象管理
同样,对于JSP for UI,我们迭代使用bean对象,该对象具有显示内容的列表
我们从1.2.2迁移到Ehcache2.9.0,只是在SpringXML上下文中更改了jar和配置。迁移之后,我们开始频繁地出现以下异常
net.sf.ehcache.CacheException:由于ConcurrentModificationException,未能序列化元素。这通常是线程之间不适当地共享线程不安全对象(如ArrayList、HashMap等)的结果
位于net.sf.ehcache.store.disk.DiskStorageFactory.serializeElement(DiskStorageFactory.java:405)
位于net.sf.ehcache.store.disk.DiskStorageFactory.write(DiskStorageFactory.java:385)
在net.sf.ehcache.store.disk.DiskStorageFactory$DiskWriteTask.call(DiskStorageFactory.java:477)
位于net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1071)
位于net.sf.ehcache.store.disk.DiskStorageFactory$PersistentDiskWriteTask.call(DiskStorageFactory.java:1055)
在java.util.concurrent.FutureTask.run(FutureTask.java:266)处
位于java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
位于java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
位于java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
位于java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
运行(Thread.java:745)
原因:java.util.ConcurrentModificationException
位于java.util.ArrayList.writeObject(ArrayList.java:766)
在sun.reflect.GeneratedMethodAccessor8008.invoke处(未知源)
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)中
位于java.lang.reflect.Method.invoke(Method.java:497)
位于java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
位于java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
位于java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
位于java.io.ObjectOutputStream.WriteObject 0(ObjectOutputStream.java:1178)
位于java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
位于java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
位于java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
位于java.io.ObjectOutputStream.WriteObject 0(ObjectOutputStream.java:1178)
位于java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
位于java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441)
位于net.sf.ehcache.Element.writeObject(Element.java:875)
我的理解是,当ehcache试图写入磁盘时,另一个线程正在修改序列化列表。我无法找到哪个线程以及它的可能性
有没有一个例子说明如何使用ehcache,在spring中以编程方式使用它,而不使用注释
关于如何识别导致此问题的线程,您有两种选择:
public class AppDataStoreService{
//datastoreregion variable declaration
private AppDataStoreRegion appDataStoreRegion;
public void storeCustObjInCache(String id, Object obj){
Cache region = appDataStoreRegion.getCustRegion();
If(region != null && id !=null && region.isElementInMemory(id)){
region.remove(id);
}
Element ele = new Element(id, obj);
If(region != null) region.put(ele);
}
}