json-to-xml

JSON-to-XML filter consisting of scanner, parser and generator. Requires no schema POJO describing the JSON. At the time I wrote this, I could find no stand-alone utility to do this (without supplying a POJO each time).

How do I get set up?

• Eclipse Java project (optional).
• Standard Eclipse import project sequence (optional).
• IntelliJ will create a project from pom.xml as well.
• Uses only external library log4j v2.x, already included (using Maven).
• Standard JUnit 4.x testing.
• Deploys as a stand-alone JAR.
• Build runnable JAR: mvn clean compile assembly:single

Whom do I talk to?

• Russell Bateman

Problems

• Exception in thread "main" java.lang.UnsupportedClassVersionError

  This application was built using Java 8. You'll need to run it using Java 8. However, it does not actually make use of Java 8 features, it's just what I was running and I did not take the trouble to fix the problem arising from executing it using Java 7. You'll see something like:

  Exception in thread "main" java.lang.UnsupportedClassVersionError: com/perfectsearchcorp/filter/JsonToXmlFilter : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) ...

  There is a helpful script, json-to-xml.sh, you can modify to suit your needs.

Sample command line and execution

$ ./json-to-xml.sh

  Please export path to Java 8 binary as variable JAVA8 before invoking, e.g:
  export JAVA8=/home/user/dev/jdk1.8.0_25/bin/java

$ export JAVA8=/home/russ/dev/jdk1.8.0_25/bin/java

$ ./json-to-xml.sh
JSON-to-XML filter (json-to-xml)
0.9
December 2014
You are free to use this utility as a binary or its sources in any way you please.
Options
--rootname <rootname>
--xmldecl <custom XML Declaration>
--dtd <DTD>
--doctype <Document type>
--pretty
--tabwidth
--version
--logging
--passive
--help

$ ./json-to-xml.sh --rootname fun --pretty --tabwidth 4 sample.json
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<fun>
    <name>Russell Bateman</name>
    <listens>Neil Young</listens>
    <address>unknown</address>
</fun>

To read from stdin

$ cat sample.json | java -jar ./target/json-to-xml-1.0.0-SNAPSHOT-jar-with-dependencies.jar