HL7Exception: Can‘t XML-encode a GenericMessage. Message must have a recognized struct

Catalog

One 、 Sample code

Two 、 Find the wrong place

3、 ... and 、 Why does it enter the error reporting judgment ？

Four 、 summary

reason ：

resolvent ：

---

Use today Hapi Analyze a hl7v2 And try to switch to xml Format encountered such an error

Exception in thread "main" ca.uhn.hl7v2.HL7Exception: Can't XML-encode a GenericMessage.  Message must have a recognized structure.
    at ca.uhn.hl7v2.parser.XMLParser.doEncode(XMLParser.java:237)
    at ca.uhn.hl7v2.parser.Parser.encode(Parser.java:276)
    at com.cr.hesb.hl7v2.HL7Helper.hl72xml(HL7Helper.java:164)
    at com.cr.hesb.hl7v2.HL7Helper.main(HL7Helper.java:25)

Baidu spent half a day , No gain , I can only go to see the source code .

One 、 Sample code

public static String hl72xml() throws HL7Exception {
        String message = "MSH|^~\\&|UMC||ZZJ||20220105101052||ADT^A01^ADT^A01|a8f662b8-6e7a|P|2.6^^&&&&D56D2C42401AAC6F36&&V1.0|||NE|AL||utf-8\n" +
                "EVN|REG|20220121235249|||01970836\n" +
                "PID||201532012|6521011986122213xx^^^^01|| Horse x bright ^^^MA ZHI MING||19861222000000|1|||& Huarong culture road  179  Number ^ Huarong ^ Yueyang ^ hunan |||||^^2|||652101198612221332|||^ The han nationality ^1||||||86^ China \n" +
                "PV1||1|311403^126^^&H002^^^^^^ Pediatric Emergency Room \\T\\ Emergency Department \\T\\ Specialist code ||123||08311056\\S\\ zhu X peak |||2||||2|2|3|1056\\S\\ Zhuxifeng ||1||||||||||||||||||||H0002|0||||20220105100100||||||03-01970836-100^123456^124512^1&4513&2412^^&9:00\\R\\12:00|0|0^1123&20220105100100&245\\S\\ Zhang Xiao ^^^^\n" +
                "IN1|1|A| At his own expense ";
        HapiContext context = new DefaultHapiContext();
        GenericParser normalParse =  new GenericParser();
        normalParse.getParserConfiguration().setValidating(false);

        Message hapiMessage = normalParse.parse(message);

        Parser xmlParser = context.getXMLParser();
        return xmlParser.encode(hapiMessage);
    }

Two 、 Find the wrong place

3、 ... and 、 Why does it enter the error reporting judgment ？

Come straight to ca.uhn.hl7v2.parser.PipeParser Under the getStructure(String message) Method

1. As shown in the figure below , First get hl7v2 To the data column of the implementation class .
2. According to the obtained data, it is divided into arrays
  2.1. If the array length is greater than or equal to 3 The subscript of the array is 2 The data of
  2.2. If the array length is less than or equal to 0&& Or for ACK, The value is directly assigned to ACK
  2.3. If array length is equal to 2 Then use the two data as “_” Splicing

3. Finally, according to the variable messageStructure To find the corresponding Message Implementation class , If empty, use GenericMessage Class to implement

Four 、 summary

reason ：

        So the error report is because XMLParser.doEncode(Message source) Methods cannot implement classes as GenericMessage The transformation of is to xml Format

resolvent ：

1. Change the of data messageStructure value （hl7v2 The column of data that implements the class ）, Make it find the corresponding entity .

2. Inherited abstract class AbstractMessage, Rewrite a corresponding entity ！