ApiException is never caught because, SAXException is thrown which can't be caught

[Padmahas Bn]

Hello,

I was following this blog to catch ApiException. So I intentionally gave invalid input by commenting out costPerUnit for LineItemService.

 

// Set the cost per unit to $2.
    lineItem.setCostType(CostType.CPM);
//    lineItem.setCostPerUnit(new Money("USD", 20000L));

But this is not throwing any ApiException, instead, its throwing SAXException. So I tried catching SAXException but its giving out compilation error "Unreachable catch block, SAXException is never thrown.....".

Hence I just caught general "Exception" and found that its throwing "NullPOinterException". So from my observation and the suggestion from SreeLaskmi at the 10th reply of this thread, I implemented "NullPinterException" catch block, but even that was also not caught.
Below is the SOAP request and the Exception.

[15 Jun 2017 21:06:12,283-requestInfoLogger:INFO:main] Request made: Service: "LineItemServiceInterfacePort" Method: "createLineItems" URL: "https://ads.google.com/apis/ads/publisher/v201702/LineItemService" Request ID: "null"
[Fatal Error] :1:1: Content is not allowed in prolog.
ERROR:  'Content is not allowed in prolog.'
[15 Jun 2017 21:06:12,431-soapXmlLogger:WARN:main] SOAP Request:
<?xml version="1.0" encoding="UTF-8"?><soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <soapenv:Header>
        <ns1:RequestHeader xmlns:ns1="https://www.google.com/apis/ads/publisher/v201702" soapenv:mustUnderstand="0">
            <ns1:networkCode>5910</ns1:networkCode>
            <ns1:applicationName>caapp2 (DfpApi-Java, Dfp-Axis/3.0.0, Common-Java/3.0.0, Axis/1.4, Java/1.8.0_102, maven)</ns1:applicationName>
        </ns1:RequestHeader>
    </soapenv:Header>
    <soapenv:Body>
        <createLineItems xmlns="https://www.google.com/apis/ads/publisher/v201702">
            <lineItems>
                <orderId>547945036</orderId>
                <name>WithoutError326121974</name>
                <startDateTimeType>IMMEDIATELY</startDateTimeType>
                <endDateTime>
                    <date>
                        <year>2017</year>
                        <month>7</month>
                        <day>15</day>
                    </date>
                    <hour>19</hour>
                    <minute>35</minute>
                    <second>22</second>
                    <timeZoneID>Asia/Dubai</timeZoneID>
                </endDateTime>
                <creativeRotationType>EVEN</creativeRotationType>
                <lineItemType>ADSENSE</lineItemType>
                <priority>4</priority>
                <costType>CPM</costType>
                <creativePlaceholders>
                    <size>
                        <width>300</width>
                        <height>250</height>
                        <isAspectRatio>false</isAspectRatio>
                    </size>
                </creativePlaceholders>
                <allowOverbook>true</allowOverbook>
                <webPropertyCode>ca-pub-415070496312123</webPropertyCode>
                <primaryGoal>
                    <goalType>DAILY</goalType>
                    <unitType>IMPRESSIONS</unitType>
                    <units>58</units>
                </primaryGoal>
                <targeting>
                    <geoTargeting>
                        <targetedLocations>
                            <id>2356</id>
                        </targetedLocations>
                        <targetedLocations>
                            <id>20461</id>
                        </targetedLocations>
                        <targetedLocations>
                            <id>9000093</id>
                        </targetedLocations>
                        <excludedLocations>
                            <id>1016367</id>
                        </excludedLocations>
                        <excludedLocations>
                            <id>200501</id>
                        </excludedLocations>
                    </geoTargeting>
                    <inventoryTargeting>
                        <targetedAdUnits>
                            <adUnitId>5889796</adUnitId>
                            <includeDescendants>true</includeDescendants>
                        </targetedAdUnits>
                    </inventoryTargeting>
                </targeting>
            </lineItems>
        </createLineItems>
    </soapenv:Body>
</soapenv:Envelope>

[15 Jun 2017 21:06:12,432-soapXmlLogger:WARN:main] SOAP Response:
velope>
Exception caught. org.xml.sax.SAXException: Invalid element in com.google.api.ads.dfp.axis.v201702.NotNullError - fieldPathElements
Exception in thread "main" java.lang.NullPointerException
    at dfp.axis.v201702.lineitemservice.CreateLineItemsExceptionHandling.runExample(CreateLineItemsExceptionHandling.java:266)
    at dfp.axis.v201702.lineitemservice.CreateLineItemsExceptionHandling.main(CreateLineItemsExceptionHandling.java:289)


Why its not caught by ApiException in the first place. And why can't the specific "NullPointerException" also was not caught?
The hierarchy of Exception is,
 ApiException
 NullPointerException
 Exception.

Thank you.

[Sreelakshmi Sasidharan (DFP API Team)]

Hi Padmahas, 

Could you please update your Java client library and try running your code again? There was an issue with the library version : 3.0.0. Upgrading the version to the next higher version (deprecated) or latest should hopefully fix the problem. Please give it a try and let me know how it goes. 

Thanks,
Sreelakshmi Sasidharan, DFP API Team

[Padmahas Bn]

Hello SreeLakshme,

Thank you for suggesting upgrading Library version. I upgraded to 3.4.0
It worked perfectly to me. ApiException caught successfully.

Thank you again.

[Sreelakshmi Sasidharan (DFP API Team)]

Hi Padmahas, 

Glad to know that the library version upgrade fixed the issue.