[CAMEL-10789] Indexing with simple expression broken in Apache Camel 2.18

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.18.0, 2.18.1, 2.18.2
• Fix Version/s: 2.18.3
• Component/s: camel-core

Environment

Camel 2.18.0/2.18.1/2.18.2 with JDK 1.8.0_112

• Estimated Complexity: Moderate
• External issue URL: http://stackoverflow.com/questions/42035770/indexing-with-simple-expression-broken-in-apache-camel-2-18
• Assignee: Claus Ibsen
• Reporter: Surjit Sen
• Created: 04/Feb/17 22:52
• Updated: 01/Mar/17 09:13
• Resolved: 01/Mar/17 09:13

Description

The following sample code works fine with version 2.17.4 (JDK 1.7), but fails on Camel 2.18.0, 2.18.1 and 2.18.2 (JDK 1.8)

from("direct:process")
        .process(new Processor() {
            public void process(Exchange exchange) {
                List<String> alist = new ArrayList<String>();
                alist.add("1");
                alist.add("99");
                exchange.getIn().setHeader("ITEMS", alist);
                exchange.getIn().setHeader("TOTAL_LOOPS", alist.size());
            }
        })
        .loop(simple("${header.TOTAL_LOOPS}", Integer.class))
          .setHeader("item", simple("${header.ITEMS[${property.CamelLoopIndex}]}", String.class))
          .log(LoggingLevel.INFO, LOG_CLASS_NAME, simple("item = ${header.item} and TOTAL_MAPS = ${header.TOTAL_LOOPS}").getText())
        .end()
        .end();

With 2.18.x, the following exception gets thrown:

2017-02-03 21:13:31 ERROR DefaultErrorHandler:204 - Failed delivery for (MessageId: ID-CATL0W10D4DG4R1-55822-1486174410756-0-1 on ExchangeId: ID-CATL0W10D4DG4R1-55822-1486174410756-0-2). Exhausted after delivery attempt: 1 caught: org.apache.camel.language.bean.RuntimeBeanExpressionException: Failed to invoke method: [${property.CamelLoopIndex}] on java.util.ArrayList due to: java.lang.IndexOutOfBoundsException: Key: ${property.CamelLoopIndex} not found in bean: [1, 99] of type: java.util.ArrayList using OGNL path [[${property.CamelLoopIndex}]]