XML to JAVA XPATH array index doesn't work under Oracle JDK 1.8

[RapperChen]

We are using smooks 1.7 to transform data from XML to Java Object. We found that the xpath array index
/xxx/yyy/zzz[1] doesn't work under oracle JDK 1.8, and hit a NullPointerException.

java.lang.NullPointerException
  at org.milyn.cdr.xpath.SelectorStep.getEvaluators(SelectorStep.java:365)
  at org.milyn.cdr.xpath.SelectorStep.getEvaluators(SelectorStep.java:361)
  at org.milyn.delivery.sax.SAXContentDeliveryConfig.addIndexCounters(SAXContentDeliveryConfig.java:233)
  at org.milyn.delivery.sax.SAXContentDeliveryConfig.addIndexCounters(SAXContentDeliveryConfig.java:215)
  at org.milyn.delivery.ContentDeliveryConfigBuilder.createConfig(ContentDeliveryConfigBuilder.java:218)
  at org.milyn.delivery.ContentDeliveryConfigBuilder.getConfig(ContentDeliveryConfigBuilder.java:148)
  at org.milyn.container.standalone.StandaloneExecutionContext.<init>(StandaloneExecutionContext.java:91)
  at org.milyn.container.standalone.StandaloneExecutionContext.<init>(StandaloneExecutionContext.java:65)
  at org.milyn.Smooks.createExecutionContext(Smooks.java:418)
  at org.milyn.Smooks.createExecutionContext(Smooks.java:376)
  at org.milyn.Smooks.filterSource(Smooks.java:456)

[asgs]

can you post a sample XML and Java testcase to reproduce the issue mentioned above?

[RapperChen]

To simulate our test, I have downloaded the sample project xml-to-java, and made some changes as below.

smooks-config.xml

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:jb="http://www.milyn.org/xsd/smooks/javabean-1.2.xsd">
    <!--
    Create an "example.beans.Order" bean instance when we visit the start of the <order> element.
    Assign the new bean instance to the beanId of "order".
    Wire in the "header" and "orderItems" beans.
    -->
    <jb:bean beanId="order" class="org.milyn.javabean.decoders.demo.Order" createOnElement="order">
        <jb:wiring property="header" beanIdRef="header" />
        <jb:wiring property="orderItems" beanIdRef="orderItems" />
    </jb:bean>

    <!--
    Create an ArrayList bean instance when we visit the start of the <order> element.
    This bean is wired into the "order" bean.
    -->
    <jb:bean beanId="orderItems" class="java.util.ArrayList" createOnElement="order/order-items/order-item/order-item">
        <jb:wiring beanIdRef="orderItem" />
    </jb:bean>

    <!--
    Create an "example.beans.Header" bean instance when we visit the start of the <header> element.
    This bean is wired into the "order" bean.
    -->
    <jb:bean beanId="header" class="org.milyn.javabean.decoders.demo.Header" createOnElement="header">
        <jb:value property="date" decoder="Date" data="header/date">
            <jb:decodeParam name="format">EEE MMM dd HH:mm:ss z yyyy</jb:decodeParam>
            <jb:decodeParam name="locale-language">en</jb:decodeParam>
            <jb:decodeParam name="locale-country">IE</jb:decodeParam>
        </jb:value>
        <jb:value property="customerNumber" decoder="Long" data="header/customer/@number" />
        <jb:value property="customerName" data="header/customer" />
    </jb:bean>

    <!--
    Create an "example.beans.OrderItem" bean instance when we visit the start of the <order-item> element.
    This bean is wired into the "orderItems" ArrayList bean.
    -->
    <jb:bean beanId="orderItem" class="org.milyn.javabean.decoders.demo.OrderItem" createOnElement="order/order-items/order-item/order-item[1]/product">
        <jb:value property="productId" decoder="Long" data="order/order-items/order-item/order-item/product" />
        <jb:value property="quantity" decoder="Integer" data="order/order-items/order-item/order-item/quantity" />
        <jb:value property="price" decoder="Double" data="order/order-items/order-item/order-item/price" />
    </jb:bean>
</smooks-resource-list>

input-message.xml

<order>
    <header>
        <date>Wed Nov 15 13:45:28 EST 2006</date>
        <customer number="123123">Joe</customer>
    </header>
    <order-items>
        <order-item>
            <order-item>
                <product>111</product>
                <quantity>2</quantity>
                <price>8.90</price>
            </order-item>

            <order-item>
                <product>222</product>
                <quantity>7</quantity>
                <price>5.20</price>
            </order-item>
        </order-item>
    </order-items>
</order>

[RapperChen]

the input-message.xml can't be displayed correctly in the comment.

I have added another node "order-item" as order-items' child.