org/json/simple/parser/ParseException while importing custom extension

[kkgooner]

I have created a custom extension in Java to generate PDF file in thingworx using JSON String as input. I have used org.json.JSONObject in my java code for implementing the PDF logic. When I import the extension to Thingworx, import fails with the below error:

[context: An unexpected server error occurred: org/json/simple/parser/ParseException][message: org/json/simple/parser/ParseException]

If I run the code locally with harcoded string as input, the code complies and PDF gets generated.

I am puzzled because I haven't used Json Simple in my code nor the Json Parser.

Below is the code for my Thing template service:

@ThingworxBaseTemplateDefinition(name = "GenericThing")
public class CreatePDFTemplate extends Thing {

private static Logger _logger = LogUtilities.getInstance().getApplicationLogger(CreatePDFTemplate.class);

public CreatePDFTemplate() {
// TODO Auto-generated constructor stub
}

// Process Report PDF (using pdfbox)


@ThingworxServiceDefinition(name = "CreatePDFProcessReport", description =
"Service to generate PDF report for Temperer", category ="", isAllowOverride = false, aspects = { "isAsync:false" })

@ThingworxServiceResult(name = "Result", description = "", baseType ="STRING", aspects = {})

public String CreatePDFProcessReport(

@ThingworxServiceParameter(name = "temperer16K", description = "",baseType = "STRING", aspects = { "isRequired:true" }) String temperer16K,

@ThingworxServiceParameter(name = "tempererLOF", description = "",baseType = "STRING", aspects = { "isRequired:true" }) String tempererLOF,

@ThingworxServiceParameter(name = "tunnelTemp16K", description = "",baseType = "STRING", aspects = { "isRequired:true" }) String tunnelTemp16K,

@ThingworxServiceParameter(name = "tunnelTempLOF", description = "",baseType = "STRING", aspects = { "isRequired:true" }) String tunnelTempLOF,

@ThingworxServiceParameter(name = "LoggedUser", description = "", baseType ="USERNAME", aspects = { "isRequired:true" }) String LoggedUser) throws
IOException, DocumentException, JSONException

{
_logger.trace("Entering Service: CreatePDFReportAtom");

DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss"); String
date = dateFormat.format(new Date());

String DEST =
"C:\\ThingworxStorage\\repository\\TestProcessPDF\\ProcessReport_"+
LoggedUser +"_"+ date + ".pdf";

new ProcessReportPDFBox().createPdfProcessReport(DEST,
temperer16K,tempererLOF,tunnelTemp16K,tunnelTempLOF);

_logger.trace("Exiting Service: CreatePDFReportAtom");

return "/Thingworx/FileRepositories/TestProcessPDF/ProcessReport_"+
LoggedUser +"_"+ date + ".pdf";

}

Also please find the method signature of my PDF creation code:

public void createPdfProcessReport(String dest,String temperer16K , String tempererLOF, String tunnelTemp16K,String tunnelTempLOF
) throws IOException, JSONException
{

Any help will be greatly appreciated!

[PaiChung]

this is a bit beyond my knowledge, but JSON objects are standard recognized within Thingworx, so I'm not sure if you can just utilize the Thingworx default capabilities in that regard.

[Constantine]

Hello,

My guess would be that since it fails during import, before you execute any of your custom code, then it's not related to your proper Java code, but instead ThingWorx cannot parse some metadata (e.g. if you include some Entities in the extension). Need to see the ZIP file to troubleshoot it better. Couple of random thoughts:

1. Try to remove unnecessary annotations (e.g. ThingworxBaseTemplateDefinition, aspects = {}, etc.)
2. Do you really need a Thing for that? Maybe a Resource will be more adequate?

/ Constantine 

[kkgooner · Accepted solution]

Update:

The issue is solved now. Apparently, removing specific exceptions in the code such as JsonException, DocumentException and replacing them with just Exception worked. 

[slangley]

Hi @kkgooner.

For the benefit of others on the community, please mark your post as the Accepted Solution.

Regards.

--Sharon