Flat buffers : Object serialization must not be nested

Question

        FlatBufferBuilder fbb = new FlatBufferBuilder(1024);

        String directory = "/Users/samarnath/RmsOne/CreateFlatBuffer/src/com/rms/objects/resources";
        File [] policyfiles = ReturnFilesWithPattern(directory, "singlecoverriskpolicy");

        for (File file: policyfiles)
        {

            Long StructureId = 0L;
            int insurer = 0;
            int insured = 0;
            int UnderWriter = 0;
            int inception = 0;
            int Expiration = 0;
            int ExternalID = 0;
            Long SubjectId =0L;
            int SubjectName = 0;
            int SubjectStructureName = 0;
            int Share = 0;
            Double blanketLimit = 0.0;
            Double attachment = 0.0;
            int causeofLoss = 0;
            int maxDeductible = 0;
            int attachmentCurrency = 0;
            int offset= 0;
            int deductibleCurrencyOffset = 0;
            int createOffset =0;
            int blanketLimitCurrency = 0;


            String folderName = "nfs://dev-spark-share.lab.rmsonecloud.net/mnt/data/UserData/import/outputfiles/Job_5/SmokeTest_2M/eufl_only_client4_2_edm__20151203-134544__24/contract/";
            List<String> lines = Files.readAllLines(file.toPath());
            List<String> actualLines = lines.subList(1, lines.size());

            for (String line:actualLines)
            {
                String [] riskitems = line.split("~");

                SingleCoverRiskPolicy.startSingleCoverRiskPolicy(fbb);
                Long Id  = Long.parseLong(riskitems[0]);
                int policyName = fbb.createString(riskitems[1]);

After the above line i get an error saying Exception in thread "main" java.lang.AssertionError: FlatBuffers: object serialization must not be nested.I get an error in fbb.createString.

The code is simple and i cant figure out whats wrong here

Answer 1

From the documentation: "Everything else (other tables, strings, vectors) MUST be created before the start of the table they are referenced in."

So move int policyName = fbb.createString(riskitems[1]) and any other strings/vectors/tables you reference in SingleCoverRiskPolicy to before startSingleCoverRiskPolicy.