问题描述
我在 Processor.process() 方法中使用的“命名查询”不起作用
--为什么？ - 我该如何解决？
感谢您的帮助！ :-)
这是带有“命名查询”的 JPA 实体...
即
@NamedQuery(name = "ThingTable.byUpdateTs",query = "SELECT e FROM ThingTable e WHERE e.updateTs > :updateTs")
流程方法代码中使用了“命名查询”（如下），但是，不起作用...>
即
@Override
public void process(Exchange msg) throws Exception {
String firedTime = msg.getIn().getHeader("firedTime",String.class);
zoneddatetime zdtNow = zoneddatetime.parse(firedTime,formatter2);
zdtNow = zdtNow.withZonesameInstant(ZoneId.of("America/New_York")); // ...in case springboot server defaults to UTC/GMT time zone...
zoneddatetime startZDT = zdtNow.minusMonths(24); //.minusSeconds(65);
//*********** this is the line of code using the "named query" **********
String pollingQuery="jpa:aaa.bbb.ccc.jar.ThingTable?namedQuery=ThingTable.byUpdateTs&updateTs='" + startZDT.format(formatter) + "'";
msg.getIn().setBody(pollingQuery);
}
Processor.process() 方法用于这条骆驼路线...
即
from("timer://pollingTimer?fixedrate=true&period=60000")
.process(theProcessor::process)
.toD("${body}")
.split(body())
.convertBodyTo(java.lang.String.class,"UTF-8")
.log("===============>>> NEW MESSAGE: ${body}");
描述错误的堆栈跟踪片段：
即
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2020-12-30 23:53:32.191 ERROR 1 --- [://pollingTimer] o.a.c.p.e.DefaultErrorHandler : Failed delivery for (MessageId: ID-7499dc21186b-1609372412151-0-1 on ExchangeId: ID-7499dc21186b-1609372412151-0-1). Exhausted after delivery attempt: 1 caught: org.apache.camel.ResolveEndpointFailedException: Failed to resolve endpoint: jpa://aaa.bbb.ccc.jar.ThingTable?namedQuery=byUpdateTs&updateTs=%272018-12-30+18%3A53%3A31%27 due to: Failed to resolve endpoint: jpa://aaa.bbb.ccc.jar.ThingTable?namedQuery=byUpdateTs&updateTs=%272018-12-30+18%3A53%3A31%27 due to: There are 1 parameters that Couldn't be set on the endpoint. Check the uri if the parameters are spelt correctly and that they are properties of the endpoint. UnkNown parameters=[{updateTs='2018-12-30 18:53:31'}]
Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId ProcessorId Processor Elapsed (ms)
[route1 ] [route1 ] [from[timer://pollingTimer?fixedrate=true&period=60000] ] [ 333]
...
[route1 ] [toD1 ] [${body} ] [ 0]
Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.ResolveEndpointFailedException: Failed to resolve endpoint: jpa://aaa.bbb.ccc.jar.ThingTable?namedQuery=byUpdateTs&updateTs=%272018-12-30+18%3A53%3A31%27 due to: Failed to resolve endpoint: jpa://aaa.bbb.ccc.jar.ThingTable?namedQuery=byUpdateTs&updateTs=%272018-12-30+18%3A53%3A31%27 due to: There are 1 parameters that Couldn't be set on the endpoint. Check the uri if the parameters are spelt correctly and that they are properties of the endpoint. UnkNown parameters=[{updateTs='2018-12-30 18:53:31'}]
at org.apache.camel.impl.engine.AbstractCamelContext.doGetEndpoint(AbstractCamelContext.java:876) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.impl.engine.AbstractCamelContext.getEndpoint(AbstractCamelContext.java:771) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.support.CamelContextHelper.getMandatoryEndpoint(CamelContextHelper.java:72) ~[camel-support-3.3.0.jar!/:3.3.0]
at org.apache.camel.support.ExchangeHelper.resolveEndpoint(ExchangeHelper.java:114) ~[camel-support-3.3.0.jar!/:3.3.0]
at org.apache.camel.support.ExchangeHelper.resolveEndpoint(ExchangeHelper.java:92) ~[camel-support-3.3.0.jar!/:3.3.0]
at org.apache.camel.processor.SendDynamicProcessor.resolveEndpoint(SendDynamicProcessor.java:287) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.processor.SendDynamicProcessor.process(SendDynamicProcessor.java:155) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$SimpleTask.run(RedeliveryErrorHandler.java:395) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148) ~[camel-base-3.3.0.jar!/:3.3.0]
at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60) ~[camel-base-3.3.0.jar!/:3.3.0]
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（尝试了 apache camel.apache.org 网站，但到目前为止，一直无法找到使用参数的示例“命名查询”示例 - 就像我上面的一样）
例如，https://camel.apache.org/components/latest/jpa-component.html)
解决方法
您已指定选项 updateTs，它不是 JPA 组件的已知选项。