使用 EhCache 配置 OpenJPA 1.3.1：未找到插件/别名
我正在尝试使用 openjpa 配置 ehcache。我收到以下错误：
org.apache.openjpa.lib.util.ParseException:
Instantiation of plugin "DataCacheManager" with value "ehcache" caused an error
"java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: ehcache".
The alias or class name may have been misspelled, or the class may not have be available in the class path.
Valid aliases for this plugin are: [default]
这是我的 persistence.xml 摘录：
<property name="openjpa.QueryCache" value="ehcache" />
<property name="openjpa.DataCacheManager" value="ehcache" />
这是我的 ehcache.xml：
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true" monitoring="autodetect" dynamicConfig="true">
<!-- -->
<cache name="openjpa" maxElementsInMemory="10000"
maxElementsOnDisk="1000" eternal="false" overflowToDisk="true"
diskSpoolBufferSizeMB="20" timeToIdleSeconds="300"
timeToLiveSeconds="600" memoryStoreEvictionPolicy="LFU"
transactionalMode="on" />
</ehcache>
这是我的 pom.xml 插件依赖项： 网络SF缓存 ehcache-openjpa 0.2.0
还有其他方式配置openjpa+ehcache吗？
I'm trying to configure ehcache with openjpa. I get the following error:
org.apache.openjpa.lib.util.ParseException:
Instantiation of plugin "DataCacheManager" with value "ehcache" caused an error
"java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: ehcache".
The alias or class name may have been misspelled, or the class may not have be available in the class path.
Valid aliases for this plugin are: [default]
here's my excerpt from persistence.xml:
<property name="openjpa.QueryCache" value="ehcache" />
<property name="openjpa.DataCacheManager" value="ehcache" />
here's my ehcache.xml:
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="true" monitoring="autodetect" dynamicConfig="true">
<!-- -->
<cache name="openjpa" maxElementsInMemory="10000"
maxElementsOnDisk="1000" eternal="false" overflowToDisk="true"
diskSpoolBufferSizeMB="20" timeToIdleSeconds="300"
timeToLiveSeconds="600" memoryStoreEvictionPolicy="LFU"
transactionalMode="on" />
</ehcache>
And here's my pom.xml plugin dependency:
net.sf.ehcache
ehcache-openjpa
0.2.0
Is there any other way to configure openjpa+ehcache?
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是的，它应该有效。确保 ehcache-openjpa jar 位于您的类路径中。我知道如果您在容器环境中运行（即：WAS），这会稍微复杂一些。
[更新]
我知道我曾经有过这个工作，我必须对 WAS 共享库做一些有趣的事情才能让它工作，但我找不到任何笔记。我模糊地记得问题与 OpenJPA 在启动时没有检测到 Ehcache 有关，反过来我们没有注册“ehcache”别名。
尝试使用以下属性配置 OpenJPA：
<属性名称=“openjpa.DataCache”值=“net.sf.ehcache.openjpa.datacache.EhCacheDataCache”/>
[/update]
Yes it should work. Make sure that the ehcache-openjpa jar is on your classpath. I know this is slightly more complicated if you are running in a container environment(ie: WAS).
[update]
I know I had this working at one point and I had to do something funny with WAS shared libraries to get this to work, but I can't find any of my notes. I vaugely recollect that the problem had to do with OpenJPA not detecting Ehcache at start up, in turn we didn't register the 'ehcache' aliases.
Try configuring OpenJPA with the following properties :
<property name="openjpa.QueryCache" value="net.sf.ehcache.openjpa.datacache.EhCacheQueryCache"/><property name="openjpa.DataCacheManager" value="net.sf.ehcache.openjpa.datacache.EhCacheDataCacheManager"/>
<property name="openjpa.DataCache" value="net.sf.ehcache.openjpa.datacache.EhCacheDataCache"/>
<property name="openjpa.RemoteCommitProvider" value="net.sf.ehcache.openjpa.datacache.NoOpRemoteCommitProvider"/>
[/update]