我尝试使用PredicateBuilder复合条件，并将其保存到标头中，以便从when访问 predicate （）函数。一开始我将body设置为Hello World。而且body不是null或不等于AUTHENTICATE failed，但我进入了when块，并且process_no_mail_or_failed正在被记录。我不明白我做错了什么。我如何在Apache Camel中复合 predicate 并在when（）函数中使用它们呢？以防我在某个步骤中必须检查主体。因此，我这样做了。
谢谢你的帮助！

Apache Camel 路线：

import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Predicate;
import org.apache.camel.Processor;
import org.apache.camel.builder.PredicateBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
public class TestRoute  extends RouteBuilder {

    static final Logger LOGGER = LoggerFactory.getLogger(EmailPollingRoute.class);
    static final String AUTHENTICATE_FAILED = "AUTHENTICATE failed.";

    @Override
    public void configure() throws Exception {

        from("quartz://emailTimer?cron=0/30+*+*+*+*+?+*")
        .log("TestRoute - Before calling transform")
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                Message message = exchange.getIn();
                message.setBody("Hello World");
                String body = message.getBody(String.class);
                LOGGER.info("body: \n" + body);

                Predicate p1 = body().isNull();
                Predicate p2 = body().isEqualTo(AUTHENTICATE_FAILED);
                Predicate predicate_result12 = PredicateBuilder.or(p1, p2);
                message.setHeader("process_no_mail_or_failed", predicate_result12);

            }   
        })
        .choice()
        .when(header("process_no_mail_or_failed").convertTo(Predicate.class)) 
        //.when(simple("${body} == null || ${body} == 'AUTHENTICATE failed.'")) //This works for me. I am getting into the otherwise block
           .log("when: ${body}")

        .otherwise()
           .log("otherwise: ${body}");

    }
}