Hibernate + EhCache = java.io.NotSerializableException
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Hibernate + EhCache = java.io.NotSerializableException
提问by Oleksandr
I'm doing load test now. After approximate 900 requests i got this error:
我现在在做负载测试。大约 900 个请求后，我收到此错误：
[ 03.08.10 11:49:00.465] [Store org.hibernate.cache.StandardQueryCache Spool Thread] ERROR net.sf.ehcache.store.DiskStore - org.hibernate.cache.StandardQueryCacheCache: Failed to write element to disk 'sql: select hotelfeatu0_.name as col_0_0_ from feature hotelfeatu0_ where hotelfeatu0_.class='org.company.domains.HotelFeatures' and hotelfeatu0_.lang=? and hotelfeatu0_.hotel_id=?; parameters: ; named parameters: {ht=100: 'Hotel', lng=en}'. Initial cause was org.company.domains.Hotel
java.io.NotSerializableException: org.company.domains.Hotel
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at java.util.HashMap.writeObject(HashMap.java:1001)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1474)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1509)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:416)
at net.sf.ehcache.Element.writeObject(Element.java:729)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
at net.sf.ehcache.util.MemoryEfficientByteArrayOutputStream.serialize(MemoryEfficientByteArrayOutputStream.java:75)
at net.sf.ehcache.store.DiskStore.serializeElement(DiskStore.java:781)
at net.sf.ehcache.store.DiskStore.writeElement(DiskStore.java:735)
at net.sf.ehcache.store.DiskStore.writeOrReplaceEntry(DiskStore.java:729)
at net.sf.ehcache.store.DiskStore.flushSpool(DiskStore.java:703)
at net.sf.ehcache.store.DiskStore.throwableSafeFlushSpoolIfRequired(DiskStore.java:671)
at net.sf.ehcache.store.DiskStore.spoolAndExpiryThreadMain(DiskStore.java:640)
at net.sf.ehcache.store.DiskStore.access0(DiskStore.java:68)
at net.sf.ehcache.store.DiskStore$SpoolAndExpiryThread.run(DiskStore.java:1110)
Here is my ehcache.xml:
这是我的 ehcache.xml：
<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="false">
<diskStore path="java.io.tmpdir/sweethome"/>
<defaultCache
maxElementsInMemory="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
maxElementsOnDisk="10000000"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
memoryStoreEvictionPolicy="LRU"
/>
<cache
name="org.hibernate.cache.StandardQueryCache"
maxElementsInMemory="5"
eternal="false"
timeToLiveSeconds="120"
overflowToDisk="true"
/>
</ehcache>
Hibernate config:
休眠配置：
hibernate {
cache.use_second_level_cache=true
cache.use_query_cache=true
cache.provider_class='org.hibernate.cache.EhCacheProvider'
connection.useUnicode=true
connection.characterEncoding='UTF-8'
dialect = 'org.hibernate.dialect.MySQL5InnoDBDialect'
}
回答by waxwing
The log tells me that this happens because the query cache tries to write one of your org.company.domains.Hotelobjects on disk. Not surprising that this might happen during a load test, since you only allow 5 elements in the query cache in memory before it tries to flush it to disk.
日志告诉我发生这种情况是因为查询缓存尝试将您的org.company.domains.Hotel对象之一写入磁盘。这在负载测试期间可能发生并不奇怪，因为在尝试将其刷新到磁盘之前，您只允许内存中的查询缓存中有 5 个元素。
You either need to make org.company.domains.Hotelimplement java.io.Serializable, or set overflowToDisk="false"for the query cache.
您要么需要org.company.domains.Hotel实现java.io.Serializable，要么overflowToDisk="false"为查询缓存设置。
