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@cacheevict有时在上下文(EL1011E)中缺少对象



我正在与错误大约一周的错误进行战斗，没有任何结果。我有一个传统的春季应用程序，该应用程序已升级到春季3.2.11.Release和Hibernate 4.2.15. -Final。有一个包含弹簧缓存注释方法的类：

public class GroovyFormulaScriptCompilerImpl implements FormulaScriptCompiler, CacheFlusher<ClassifyObjectAttributePlain>, InitializingBean {
   …
    @Override
    @Cacheable(value="compile_cache", key="'formulaforAttribute' + #classifyObjectAttribute.getPlainId()")
    public FormulaScript compile(ClassifyObjectAttributePlain classifyObjectAttribute) {
       ...
    }
    @Override
    @CacheEvict(value="compile_cache", key="'formulaforAttribute' + #arg0.getPlainId()")
    public void flush(ClassifyObjectAttributePlain arg0) {
      if(logger.isDebugEnabled())
        logger.debug("Flushing formula script for attribute id=" + arg0.getPlainId() + "[" + arg0.getPlainData().getName() + "]");
    }
}

在某个时候生成了一个应用程序事件，这会导致听众在几个类中调用flush（）方法，包括groovyformulascriptcompilerimpl类。当我在日志文件中看到logger.debug输出时，齐平方法肯定被调用（请参见下文，在时间19：39：01,149），但是从高速缓存中驱逐从该方法返回后必须发生的一个物品由于错误而失败后必须发生。" org.springframework.expression.spel.spel.spelevaluationException：el1011e ：（ pos 30）：方法调用：尝试在null上下文对象上调用方法getPlainId（）"。这导致回滚数据库事务。以下是从日志文件中提取的（我缩短了休眠跟踪消息）：

19:39:01,131 DEBUG RecWasModifiedPublicationInterceptor:23 - Generating modification event for ClassifyObjectAttributePlain id=142...
19:39:01,131 DEBUG DefaultListableBeanFactory:243 - Returning cached instance of singleton bean 'trigger.attributeWasModifiedObserver.observable'
19:39:01,131 DEBUG DefaultListableBeanFactory:243 - Returning cached instance of singleton bean 'com.ps.service.event.RecWasModifiedFlushingListener#0'
19:39:01,132 DEBUG DefaultListableBeanFactory:243 - Returning cached instance of singleton bean 'com.ps.service.event.RecWasModifiedFlushingListener#1'
19:39:01,132 DEBUG DefaultListableBeanFactory:243 - Returning cached instance of singleton bean 'com.ps.service.event.RecWasModifiedFlushingListener#2'
19:39:01,132 DEBUG DefaultListableBeanFactory:243 - Returning cached instance of singleton bean 'com.ps.service.event.RecWasModifiedFlushingListener#3'
19:39:01,132 DEBUG CTAttributeWasModifiedObservingTrigger:79 - Generating RecWasModifiedEvent for classify type = 42 due to change of attribute packDownGrade
19:39:01,133 DEBUG CTAttributeWasModifiedObservingTrigger:99 - Removed observing for classify type 42
19:39:01,133 DEBUG ClassifyDataCompilerImpl:76 - Flushing classify type id=42 [Subs]
19:39:01,148 DEBUG JpaDcsDao:948 - Flushing classify type id=42
19:39:01,149 DEBUG GroovyFormulaScriptCompilerImpl:111 - Flushing formula script for attribute id=142[packDownGrade]
19:39:01,155 DEBUG HibernateTransactionManager:844 - Initiating transaction rollback
19:39:01,156 DEBUG HibernateTransactionManager:571 - Rolling back Hibernate transaction on Session [...]
19:39:01,156 DEBUG AbstractTransactionImpl:203 - rolling back
19:39:01,169 DEBUG JdbcTransaction:164 - rolled JDBC Connection
19:39:01,169 DEBUG JdbcTransaction:126 - re-enabling autocommit
19:39:01,169 DEBUG LogicalConnectionImpl:198 - Aggressively releasing JDBC connection
19:39:01,169 DEBUG LogicalConnectionImpl:232 - Releasing JDBC connection
19:39:01,169 DEBUG LogicalConnectionImpl:250 - Released JDBC connection
19:39:01,170 DEBUG HibernateTransactionManager:633 - Closing Hibernate Session [...] after transaction
19:39:01,171 DEBUG JdbcCoordinatorImpl:182 - HHH000420: Closing un-released batch
19:39:01,171  WARN ChangelogEditorController:53 - Error parsing request
org.springframework.expression.spel.SpelEvaluationException: EL1011E:(pos 30): Method call: Attempted to call method getPlainId() on null context object
at org.springframework.expression.spel.ast.MethodReference.throwIfNotNullSafe(MethodReference.java:135)
at org.springframework.expression.spel.ast.MethodReference.getValueRef(MethodReference.java:68)
at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:63)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:82)
at org.springframework.expression.spel.ast.OpPlus.getValueInternal(OpPlus.java:70)
at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:93)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:89)
at org.springframework.cache.interceptor.ExpressionEvaluator.key(ExpressionEvaluator.java:95)
at org.springframework.cache.interceptor.CacheAspectSupport$CacheOperationContext.generateKey(CacheAspectSupport.java:448)
at org.springframework.cache.interceptor.CacheAspectSupport.inspectCacheEvicts(CacheAspectSupport.java:251)
at org.springframework.cache.interceptor.CacheAspectSupport.inspectAfterCacheEvicts(CacheAspectSupport.java:227)
at org.springframework.cache.interceptor.CacheAspectSupport.execute(CacheAspectSupport.java:212)
at org.springframework.cache.interceptor.CacheInterceptor.invoke(CacheInterceptor.java:66)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy60.flush(Unknown Source)
at com.ps.service.event.RecWasModifiedFlushingListener$1.update(RecWasModifiedFlushingListener.java:32)
at java.util.Observable.notifyObservers(Observable.java:159)
at com.ps.service.event.RecWasModifiedObservingListener.onApplicationEvent(RecWasModifiedObservingListener.java:40)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:96)
at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:334)
at com.ps.service.event.RecWasModifiedPublicationInterceptor.invoke(RecWasModifiedPublicationInterceptor.java:24)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:51)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:51)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:51)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:51)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at com.sun.proxy.$Proxy59.updateClassifyObjectAttribute(Unknown Source)
...

我无法理解的是，为什么参数arg0在冲洗方法中可用，但稍后在Spel上下文中变得无法使用。

以下是getPlainId（）方法的声明，分类aTtributeplain类（它包含一些冬眠的缓存注释，但第二级缓存已在全球范围内关闭）：

> 
@Entity(name="object_attribute_plain")
@Table(name="fact_attributes")
@Cache(usage=CacheConcurrencyStrategy.READ_WRITE,region="rules_cache")
@BatchSize(size=5)
@Filter(name="logicalDeletedFilter")
public class ClassifyObjectAttributePlain extends PlainRecordAbstract<ClassifyObjectAttribute> {
private Long plainId;
private static final String seqName="fatr_seq";
@Id
@Column(name="fatr_id")
@SequenceGenerator(name=seqName,sequenceName=seqName,allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator=seqName) 
public Long getPlainId() {
    return plainId;
}
public void setPlainId(Long id) {
    this.plainId = id;
}
...
}

一个重要的说明：错误是稳定的，但是如果GroovyulascriptCompilerimpl类的冲洗方法是单独调用的，而无需调用我上面提到的其他类中的齐平方法，则不会发生。

任何建议或假设都将不胜感激。

最后我解决了问题。如果有人面对它，解决方案是用位置名称更改参数名称：

@CacheEvict(value="compile_cache", key="'formulaforAttribute' + #p0.getPlainId()")
public void flush(ClassifyObjectAttributePlain arg0) {

带有跟踪消息的日志记录确认@cacheevict有效：

19:39:35,121 DEBUG AnnotationCacheOperationSource:108 - Adding cacheable method 'flush' with attribute: [CacheEvictOperation[public void com.ps.service.JpaDcsDao.flush(com.ps.dmcl.plain.ClassifyTypePlain)] caches=[compile_cache] | key=''classifyType' + #p0.getPlainId()' | condition='',false,false]
19:39:35,122 DEBUG JpaDcsDao:949 - Flushing classify type id=42
19:39:35,363 TRACE CacheInterceptor:254 - Invalidating cache key classifyType42 for operation CacheEvictOperation[public void com.ps.service.JpaDcsDao.flush(com.ps.dmcl.plain.ClassifyTypePlain)] caches=[compile_cache] | key=''classifyType' + #p0.getPlainId()' | condition='',false,false on method public abstract void com.ps.service.CacheFlusher.flush(com.ps.dmcl.PlainRecord)
19:39:35,366 DEBUG AnnotationCacheOperationSource:108 - Adding cacheable method 'flush' with attribute: [CacheEvictOperation[public void com.ps.ClassifyDataCompilerImpl.flush(com.ps.dmcl.plain.ClassifyTypePlain)] caches=[compile_cache] | key=''compiledData' + #p0.getPlainId()' | condition='',false,false]
19:39:35,366 DEBUG ClassifyDataCompilerImpl:77 - Flushing compiled classify type id=42 [Subs]
19:39:35,367 TRACE CacheInterceptor:254 - Invalidating cache key compiledData42 for operation CacheEvictOperation[public void com.ps.ClassifyDataCompilerImpl.flush(com.ps.dmcl.plain.ClassifyTypePlain)] caches=[compile_cache] | key=''compiledData' + #p0.getPlainId()' | condition='',false,false on method public abstract void com.ps.service.CacheFlusher.flush(com.ps.dmcl.PlainRecord)
19:39:35,368 DEBUG AnnotationCacheOperationSource:108 - Adding cacheable method 'flush' with attribute: [CacheEvictOperation[public void com.ps.GroovyFormulaScriptCompilerImpl.flush(com.ps.dmcl.plain.ClassifyObjectAttributePlain)] caches=[compile_cache] | key=''formulaforAttribute' + #p0.getPlainId()' | condition='',false,false]
19:39:35,368 DEBUG GroovyFormulaScriptCompilerImpl:112 - Flushing formula script for attribute id=142[packDownGrade]
19:39:35,369 TRACE CacheInterceptor:254 - Invalidating cache key formulaforAttribute142 for operation CacheEvictOperation[public void com.ps.GroovyFormulaScriptCompilerImpl.flush(com.ps.dmcl.plain.ClassifyObjectAttributePlain)] caches=[compile_cache] | key=''formulaforAttribute' + #p0.getPlainId()' | condition='',false,false on method public abstract void com.ps.service.CacheFlusher.flush(com.ps.dmcl.PlainRecord)
19:39:35,369 TRACE TransactionInterceptor:473 - Completing transaction for [com.ps.controller.RuleEditorServiceImpl.updateDerivedAttribute2]
19:39:35,369 TRACE HibernateTransactionManager:923 - Triggering beforeCommit synchronization
19:39:35,369 TRACE HibernateTransactionManager:936 - Triggering beforeCompletion synchronization
19:39:35,369 DEBUG HibernateTransactionManager:753 - Initiating transaction commit

它类似于这篇文章... SPEL为有效对象找到null，但是在我的情况下，提出了调试信息，并且错误发生的情况取决于该方法是单独执行还是与其他@Cacheevict的其他注释方法伴随。因此，现在它有效，但错误原点仍不清楚。

"在第8版之前的Java Runtimes上，由于JLS的限制定义了对于抽象类型的限制，因此在组合期间没有保留参数名称，因此实际上无法正常工作。为什么参数名称查找在此处失败。

您基本上有两个选择：

使用Java 8并在编译时启用-Parameters标志。按照弹簧参考文档中记录的SPEL表达中使用位置参数绑定。"

来源：https：//jira.spring.io/browse/datajpa-598

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