Hibernate惰性加载代理 - GORM静态Api的`instanceOf`抛出ClassCastException异常 [英] Hibernate Lazy Loading Proxy - GORM Static Api's `instanceOf` throws ClassCastException

问题描述

我在groovy / grails中重构现有系统的遗留代码。我不想使用 .class.name 来检查类的类型，我想使用代理安全和更简洁的.instanceOf（尽管长期目标是摆脱这些类型的检查完全）。

编辑2014/10/07：转换到静态instanceOf方法不仅用于更简洁的代码;这是关于不必担心由延迟加载的实例导致的hibernate代理。下面的服务方法可能会收到一个域类实例或一个hibernate代理作为参数。

大多数情况下，在遍历共享超类的对象。这是一个简化的例子：

  class PartnerContract {
合作伙伴合作伙伴
字符串serialCode 
日期startDate 
日期endDate 
} 
 
类ServiceContract extends PartnerContract {
 BigDecimal payRate 
} 
 
类SpecialOrderContract extends PartnerContract 
 BigDecimal工资
} 
  

常见操作是查找所有客户合约（未指定在域示例中）适合某个合作伙伴合同。

在服务方法中，它的实现类似于：

  ... 
 def pc = [] 
 partnerContracts.each {pv  - > 
（getCustomerContracts（pv）.collect（pc）{it} 
} 
 ... 
 
 def getCustomerContracts（PartnerContract partnerContractInstance）{
 def customerContracts = [] 
 $ b $ if（partnerContractInstance.instanceOf（ServiceContract））{
 //找到合约并添加到customerContracts 
} 
 else if（partnerContractInstance.instanceOf（SpecialOrderContract ））{
 //找到合同并添加到customerContracts 
} 
 customerContracts 
} 
  

在我的本地环境中，一切都按预期工作。（编辑2014/10/07： run-war ， test run-war 和 prod run-war 可以正常工作）。但是，奇怪的是，当将WAR文件部署到服务器时，会引发以下异常：

以下例外情况是：引发：

  com.itf.propart.PartnerContract _ $$ _ javassist_157不能转换为com.itf.propart.ServiceContract 
  

在我看来，无论我使用 instanceOf 做了什么错误，它在本地环境中工作是非常令人误解的，但不是在构建WAR文件时。我不明白为什么它在任何情况下都能正常工作。感觉很麻烦。

编辑2014/10/07：我发现了一些可能与 server.log 。大多数（或甚至所有）域类都会引发此异常。 DienstleistungsVertragTM 是 ServiceContract ：



  [＃| 2014-10-07T13：03：50.348 + 0200 | INFO | glassfish3.0.1 | javax.enterprise.system.std.com.sun.enterprise.v3.services.impl | _ThreadID = 34; _ThreadName = Thread-1; | 2014-10-07 13：03：50,348 [http-thread-pool-9048-（19）]错误pojo.BasicLazyInitializer  -  Javassist增强失败：com.itf.propart.DienstleistungsVertragTM 
 java.lang.NoSuchMethodError：javassist.util.proxy.ProxyFactory.setUseCache（Z）V 
 at com.sun.enterprise.web.WebModule.contextListenerStart（WebModule.java:535）
 at com.sun.enterprise.web.WebModule.start（WebModule.java:499）
 at com.sun.enterprise.web.WebContainer.loadWebModule（WebContainer.java:1947）
 at com.sun .enterprise.web.WebContainer.loadWebModule（WebContainer.java:1619）
 at com.sun.enterprise.web.WebApplication.start（WebApplication.java:90）
 at org.glassfish.internal.data .EngineRef.start（EngineRef.java:126）
 at org.glassfish.internal.data.ModuleInfo.start（ModuleInfo.java:241）
 at org.glassfish.internal.data.ApplicationInfo.start（ApplicationInfo.java:236）
 at com.sun .enterprise.v3.server.ApplicationLifecycle.deploy（ApplicationLifecycle.java:339）
 at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy（ApplicationLifecycle.java:183）
 org.glassfish .deployment.admin.DeployCommand.execute（DeployCommand.java:272）
 at com.sun.enterprise.v3.admin.CommandRunnerImpl $ 1.execute（CommandRunnerImpl.java:305）
 at com.sun。 enterprise.v3.admin.CommandRunnerImpl.doCommand（CommandRunnerImpl.java:320）
 at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand（CommandRunnerImpl.java:1176）
 at com.sun。 enterprise.v3.admin.CommandRunnerImpl.access $ 900（CommandRunnerImpl.java:83）
 at com.sun.enterprise.v3.admin.CommandRunnerImpl $ ExecutionContext.execute（CommandRunnerImpl.java:1235）
 at com .sun.enterprise.v3.admin.CommandRunnerI mpl $ ExecutionContext.execute（CommandRunnerImpl.java:1224）
位于org.glassfish.admingui.common.util.LocalDeploymentFacility $ LocalDFCommandRunner.run（LocalDeploymentFacility.java:138）
位于org.glassfish.deployment。在org.glassfish.admingui.common.util.DeployUtil.invokeDeploymentFacility上的
（DeployUtil.java:89）$ or $ .gbfish.admingui.common 
。 util.DeployUtil.deploy（DeployUtil.java:66）
位于org.glassfish.admingui.common.handlers.DeploymentHandler.deploy（DeploymentHandler.java:186）
位于com.sun.jsftemplating.layout。在com.sun.jsftemplating.layout.descriptors.LayoutElementBase.dispatchHandlers（LayoutElementBase.java:420）
处com.sun.jsftemplating处，
（$ descriptor.handler.Handler.invoke（Handler.java:442）
。 layout.descriptors.LayoutElementBase.dispatchHandlers（LayoutElementBase.java:394）
 at com.sun.jsftemplating.layout.event.CommandActionListener.invokeComm andHandlers（CommandActionListener.java:150）
 at com.sun.jsftemplating.layout.event.CommandActionListener.processAction（CommandActionListener.java:98）
 at javax.faces.event.ActionEvent.processListener（ActionEvent。在javax.faces.component.UIComponentBase.broadcast（UIComponentBase.java:772）
在javax.faces.component.UICommand.broadcast（UICommand.java:300）上
 
 at com.sun.webui.jsf.component.WebuiCommand.broadcast（WebuiCommand.java:166）
 at javax.faces.component.UIViewRoot.broadcastEvents（UIViewRoot.java:775）
 at javax.faces .component.UIViewRoot.processApplication（UIViewRoot.java:1267）
 at com.sun.faces.lifecycle.InvokeApplicationPhase.execute（InvokeApplicationPhase.java:82）
 at com.sun.faces.lifecycle.Phase .doPhase（Phase.java:101）
 at com.sun.faces.lifecycle.LifecycleImpl.execute（LifecycleImpl.java:118）
 at javax.faces.webapp.FacesServlet.service（FacesServlet.java ：312）
在com.sun.webui.j sf.util.UploadFilter.doFilter（UploadFilter.java:223）
 at com.sun.enterprise.web.WebPipeline.invoke（WebPipeline.java:97）
 at com.sun.enterprise.web。 PESessionLockingStandardPipeline.invoke（PESessionLockingStandardPipeline.java:85）
 at com.sun.enterprise.v3.services.impl.ContainerMapper.service（ContainerMapper.java:239）
 at com.sun.grizzly.http。 ProcessorTask.invokeAdapter（ProcessorTask.java:791）
 at com.sun.grizzly.http.ProcessorTask.doProcess（ProcessorTask.java:693）
 at com.sun.grizzly.http.ProcessorTask.process（ ProcessorTask.java:954）
 at com.sun.grizzly.http.DefaultProtocolFilter.execute（DefaultProtocolFilter.java:170）
 at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter（DefaultProtocolChain.java:135） 
 at com.sun.grizzly.DefaultProtocolChain.execute（DefaultProtocolChain.java:102）
 at com.sun.grizzly.DefaultProtocolChain.execute（DefaultProtocolChain.java:88）
 at com.sun .grizzly.http.HttpPro tocolChain.execute（HttpProtocolChain.java:76）
 at com.sun.grizzly.ProtocolChainContextTask.doCall（ProtocolChainContextTask.java:53）
 at com.sun.grizzly.SelectionKeyContextTask.call（SelectionKeyContextTask.java： 57）
 at com.sun.grizzly.ContextTask.run（ContextTask.java:69）
 at com.sun.grizzly.util.AbstractThreadPool $ Worker.doWork（AbstractThreadPool.java:330）
在com.sun.grizzly.util.AbstractThreadPool $ Worker.run（AbstractThreadPool.java:309）$ b $在java.lang.Thread.run（Thread.java:619）
  




解决方案

我的问题中描述的问题只是另一个问题在部署时发生。

I am refactoring legacy code of an existing System in groovy/grails. Instead of using .class.name to check for a class type, I want to use the proxy safe and more concise .instanceOf (although the long term goal is to get rid of those type checks entirely).

EDIT 2014/10/07: The shift to the static instanceOf method is not only for more concise code; this is about not having to worry about the hibernate proxies that result from the lazily loaded instances. The service method below may receive a domain class instance or a hibernate proxy as argument.

Mostly the check for the class name is used when iterating through lists of objects that share a superclass. This is a simplified example:

class PartnerContract{
    Partner partner
    String serialCode
    Date startDate
    Date endDate
}

class ServiceContract extends PartnerContract{
    BigDecimal payRate
}

class SpecialOrderContract extends PartnerContract
    BigDecimal wage
}

A common operation is to find all customer contracts (not specified in domain example) that fit to a certain partner contract.

In the service method, it is implemented similar to that:

    ...
    def pc = []
    partnerContracts.each{pv ->
      (getCustomerContracts(pv).collect(pc){it}
    }    
    ...

def getCustomerContracts(PartnerContract partnerContractInstance){
    def customerContracts = []

    if(partnerContractInstance.instanceOf(ServiceContract)){    
        //find contracts and add to customerContracts
    }
    else if(partnerContractInstance.instanceOf(SpecialOrderContract)){
        //find contracts and add to customerContracts
    }
    customerContracts
}

In my local environment, everything works as expected. (EDIT 2014/10/07: run-war, test run-war and prod run-war work just fine.) This was not the kind of change where I was expecting any issues at all, since it seemed rather trivial. But, weirdly, when deploying a WAR file to the server, the following exception is thrown:

Following exception is thrown:

com.itf.propart.PartnerContract_$$_javassist_157 cannot be cast to com.itf.propart.ServiceContract

In my opinion, no matter what I have done wrong using instanceOf, it is very misleading that it works in a local environment but not when building a WAR file. I don't understand why it should work under any circumstances if it is not correct. Feels quite buggy.

EDIT 2014/10/07: I found something that might be related in the server.log. This exception is thrown for most (or maybe even all) domain classes. DienstleistungsVertragTM is the ServiceContract:

    [#|2014-10-07T13:03:50.348+0200|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=34;_ThreadName=Thread-1;|2014-10-07 13:03:50,348 [http-thread-pool-9048-(19)] ERROR pojo.BasicLazyInitializer  - Javassist Enhancement failed: com.itf.propart.DienstleistungsVertragTM
java.lang.NoSuchMethodError: javassist.util.proxy.ProxyFactory.setUseCache(Z)V
    at com.sun.enterprise.web.WebModule.contextListenerStart(WebModule.java:535)
    at com.sun.enterprise.web.WebModule.start(WebModule.java:499)
    at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1947)
    at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1619)
    at com.sun.enterprise.web.WebApplication.start(WebApplication.java:90)
    at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126)
    at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241)
    at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339)
    at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:183)
    at org.glassfish.deployment.admin.DeployCommand.execute(DeployCommand.java:272)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$1.execute(CommandRunnerImpl.java:305)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:320)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.doCommand(CommandRunnerImpl.java:1176)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl.access$900(CommandRunnerImpl.java:83)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1235)
    at com.sun.enterprise.v3.admin.CommandRunnerImpl$ExecutionContext.execute(CommandRunnerImpl.java:1224)
    at org.glassfish.admingui.common.util.LocalDeploymentFacility$LocalDFCommandRunner.run(LocalDeploymentFacility.java:138)
    at org.glassfish.deployment.client.AbstractDeploymentFacility.deploy(AbstractDeploymentFacility.java:350)
    at org.glassfish.admingui.common.util.DeployUtil.invokeDeploymentFacility(DeployUtil.java:89)
    at org.glassfish.admingui.common.util.DeployUtil.deploy(DeployUtil.java:66)
    at org.glassfish.admingui.common.handlers.DeploymentHandler.deploy(DeploymentHandler.java:186)
    at com.sun.jsftemplating.layout.descriptors.handler.Handler.invoke(Handler.java:442)
    at com.sun.jsftemplating.layout.descriptors.LayoutElementBase.dispatchHandlers(LayoutElementBase.java:420)
    at com.sun.jsftemplating.layout.descriptors.LayoutElementBase.dispatchHandlers(LayoutElementBase.java:394)
    at com.sun.jsftemplating.layout.event.CommandActionListener.invokeCommandHandlers(CommandActionListener.java:150)
    at com.sun.jsftemplating.layout.event.CommandActionListener.processAction(CommandActionListener.java:98)
    at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
    at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:772)
    at javax.faces.component.UICommand.broadcast(UICommand.java:300)
    at com.sun.webui.jsf.component.WebuiCommand.broadcast(WebuiCommand.java:166)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312)
    at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:223)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
    at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:239)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
    at java.lang.Thread.run(Thread.java:619)

解决方案

The issue described in my question is just one consequence of another issue that occurs on deployment.

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