Question

我想从历史数据初始化/更新模式的状态，并且在某些情况下经常得到StackOverflowError。我写了一个简单的例子来证明：

public class Main {
EsperPatternStackOverflow.zip
    public static void main(String[] args) {
        Configuration configuration = new Configuration();
        configuration.addEventType("TestEvent", TestEvent.class);
        configuration.getEngineDefaults().getViewResources().setShareViews(false);
        configuration.getEngineDefaults().getExecution().setAllowIsolatedService(true);
        EPServiceProvider epService = EPServiceProviderManager.getDefaultProvider(configuration);
        epService.initialize();

        EPServiceProviderIsolated isolatedService = epService.getEPServiceIsolated("Isolated");
        EPStatement stmt = isolatedService.getEPAdministrator().createEPL("select * from pattern [every (a=TestEvent -> b=TestEvent(theString=a.theString)) where timer:within(1 day)]", "TestStatement",null);
        int hour_ms = 60*60*1000;
        isolatedService.getEPRuntime().sendEvent(new CurrentTimeEvent(System.currentTimeMillis()- 2*hour_ms));
        isolatedService.getEPRuntime().sendEvent(new TestEvent("str1", 1));
         stmt.addListener((newEvents, oldEvents) -> {
            System.out.println("Fired");
        });
        isolatedService.getEPAdministrator().removeStatement(stmt);
        epService.getEPRuntime().sendEvent(new TestEvent("str1", 3));
    }
}

TestEvent是一个带有两个字段的简单类：int theInt，String theString。

结果：

Exception in thread "main" java.lang.StackOverflowError
        at com.espertech.esper.filter.FilterParamIndexEquals.matchEvent(FilterParamIndexEquals.java:29)
        at com.espertech.esper.filter.FilterHandleSetNode.matchEvent(FilterHandleSetNode.java:99)
        at com.espertech.esper.filter.EventTypeIndex.matchType(EventTypeIndex.java:170)
        at com.espertech.esper.filter.EventTypeIndex.matchEvent(EventTypeIndex.java:108)
        at com.espertech.esper.filter.FilterServiceBase.retryableMatchEvent(FilterServiceBase.java:179)
        at com.espertech.esper.filter.FilterServiceBase.evaluateInternal(FilterServiceBase.java:109)
        at com.espertech.esper.filter.FilterServiceLockCoarse.evaluate(FilterServiceLockCoarse.java:67)
        at com.espertech.esper.core.service.EPRuntimeImpl.handleFilterFault(EPRuntimeImpl.java:1267)
        at com.espertech.esper.core.service.EPRuntimeImpl.processStatementFilterSingle(EPRuntimeImpl.java:1242)
        at com.espertech.esper.core.service.EPRuntimeImpl.handleFilterFault(EPRuntimeImpl.java:1271)
        at com.espertech.esper.core.service.EPRuntimeImpl.processStatementFilterSingle(EPRuntimeImpl.java:1242)
.......................................................................................................................................................................

此外，我得到了类似案例的下一个例外（仅在例外的顶点不同）：

java.lang.StackOverflowError
        at com.espertech.esper.event.bean.CGLibPropertyGetter.get(CGLibPropertyGetter.java:63)
        at com.espertech.esper.filter.FilterParamIndexEquals.matchEvent(FilterParamIndexEquals.java:29)
        at com.espertech.esper.filter.FilterHandleSetNode.matchEvent(FilterHandleSetNode.java:99)
        at com.espertech.esper.filter.EventTypeIndex.matchType(EventTypeIndex.java:170)
        at com.espertech.esper.filter.EventTypeIndex.matchEvent(EventTypeIndex.java:108)
        at com.espertech.esper.filter.FilterServiceBase.retryableMatchEvent(FilterServiceBase.java:179)
        at com.espertech.esper.filter.FilterServiceBase.evaluateInternal(FilterServiceBase.java:109)
        at com.espertech.esper.filter.FilterServiceLockCoarse.evaluate(FilterServiceLockCoarse.java:67)
        at com.espertech.esper.core.service.EPRuntimeImpl.handleFilterFault(EPRuntimeImpl.java:1267)
        at com.espertech.esper.core.service.EPRuntimeImpl.processStatementFilterSingle(EPRuntimeImpl.java:1242)
        at com.espertech.esper.core.service.EPRuntimeImpl.handleFilterFault(EPRuntimeImpl.java:1271)
        at com.espertech.esper.core.service.EPRuntimeImpl.processStatementFilterSingle(EPRuntimeImpl.java:1242)
......................................................................................................................................................................

为什么会抛出此异常，如何解决此问题？谢谢。

Answer 1

已在5.5.0版本中修复

来自changelog（https://github.com/espertechinc/esper/blob/master/changelog.txt）：

错误修复 - 修正了ESC-000-00001堆栈溢出问题创建隔离模式语句，部分完成模式和取消隔离stmt

Esper：在esper中将模式移入/移出隔离状态时发生StackOverflowError

1 个答案: