org.springframework.expression.spel.SpelEvaluationException：EL1005E：找不到类型“com.company.package.SomeClass”

问题描述 投票：0回答：1

注意：我使用的是 Spring Boot 2.2.0.RELEASE，所以它与 this 无关。

我有一个

MessagingGateway
，如下：

@Gateway(
            requestChannel = "myChannel",
            headers = @GatewayHeader(
                    name = "tenantId",
                    expression = "T(com.company.package.ContextHolder).getContext()?.tenant?.identifier"))
    void publishEvent(@Header(value = "eventType") String eventType,
                      @Payload Object payload);

我的

ContextHolder
类类似于
SecurityContextHolder
或
RequestContextHolder
，我在其中添加了一些基本请求相关信息，就像
SecurityContext
一样。

问题是，这在我的机器上运行得很好，并且对于大多数对 

publishEvent
方法的调用，它也在服务器上运行。然而，对于某些方法，我得到：

org.springframework.expression.spel.SpelEvaluationException: EL1005E: Type cannot be found 'com.company.package.ContextHolder'
        at org.springframework.expression.spel.support.StandardTypeLocator.findType(StandardTypeLocator.java:117) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.ExpressionState.findType(ExpressionState.java:155) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.ast.TypeReference.getValueInternal(TypeReference.java:69) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:55) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:91) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:112) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:330) ~[spring-expression-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper.evaluateHeaders(GatewayMethodInboundMessageMapper.java:213) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper.access$1000(GatewayMethodInboundMessageMapper.java:86) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper$DefaultMethodArgsMessageMapper.buildMessage(GatewayMethodInboundMessageMapper.java:434) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper$DefaultMethodArgsMessageMapper.toMessage(GatewayMethodInboundMessageMapper.java:340) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper$DefaultMethodArgsMessageMapper.toMessage(GatewayMethodInboundMessageMapper.java:288) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper.mapArgumentsToMessage(GatewayMethodInboundMessageMapper.java:198) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper.toMessage(GatewayMethodInboundMessageMapper.java:192) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayMethodInboundMessageMapper.toMessage(GatewayMethodInboundMessageMapper.java:86) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.support.converter.SimpleMessageConverter.toMessage(SimpleMessageConverter.java:111) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.messaging.core.AbstractMessageSendingTemplate.doConvert(AbstractMessageSendingTemplate.java:182) ~[spring-messaging-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:150) ~[spring-messaging-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.messaging.core.AbstractMessageSendingTemplate.convertAndSend(AbstractMessageSendingTemplate.java:143) ~[spring-messaging-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.MessagingGatewaySupport.send(MessagingGatewaySupport.java:417) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.sendOrSendAndReceive(GatewayProxyFactoryBean.java:576) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.invokeGatewayMethod(GatewayProxyFactoryBean.java:508) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.doInvoke(GatewayProxyFactoryBean.java:478) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.integration.gateway.GatewayProxyFactoryBean.invoke(GatewayProxyFactoryBean.java:468) ~[spring-integration-core-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.0.RELEASE.jar!/:5.2.0.RELEASE]
        at com.sun.proxy.$Proxy168.publishEvent(Unknown Source) ~[na:na]
        at com.company.project.services.SomeService.lambda$bulk$2(SomeService.java:434) ~[project-api-0.5.0.RELEASE.jar!/:na]
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
        at java.base/java.util.stream.SpinedBuffer.forEach(SpinedBuffer.java:246) ~[na:na]
        at java.base/java.util.stream.Nodes$SpinedNodeBuilder.forEach(Nodes.java:1270) ~[na:na]
        at java.base/java.util.stream.Nodes$InternalNodeSpliterator$OfRef.forEachRemaining(Nodes.java:1105) ~[na:na]
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
        at java.base/java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:290) ~[na:na]
        at java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:746) ~[na:na]
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) ~[na:na]
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) ~[na:na]
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) ~[na:na]
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) ~[na:na]
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[na:na]

并且 

bulk
的 
SomeService
方法有点像：

StreamSupport
    .stream(worksheet.spliterator(), true)
    .skip(1)
    .forEach(row -> {

        // insert row into db and publish message

        this.applicationEventGateway.publishEvent("rowCreated", row);

    });


Worksheet
是 Apache POI 工作表。我知道该方法是在并行流中调用的，但是会导致找不到类的错误吗？我错过了什么？

spring spring-boot spring-integration spring-el
1个回答
0
投票

感觉就像

parallel
对于
Stream
使它寻找不同的
ClassLoader
。

如果您能在没有

parallel
的情况下确认它是如何工作的，那就太好了。

感觉 Spring Integration 的 

IntegrationEvaluationContextFactoryBean
可以用 
StandardTypeLocator
中的 
ClassLoader
修复为 
BeanFactory
。

您可以考虑一种解决方法，例如使用 

IntegrationEvaluationContextFactoryBean
名称为 
IntegrationContextUtils.INTEGRATION_EVALUATION_CONTEXT_BEAN_NAME
创建一个 bean，并根据 
typeLocator
类加载器将 
StandardTypeLocator
设置为 
BeanFactory
。

如果是这种情况，请提出 GH 问题，以便我们尽快修复。

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