{"data":{"post":{"fields":{"slug":"/make-jaxb-great-again/","date":"2018-05-29"},"html":"

TL;DR

\n

You don’t need to suffer from headache when working with JAXB-generated classes.\nAdd a java.time adapter and amend the DTOs with fluent builder API instead.

\n

Intro

\n

Our team is creating a bi-directional integration with a third party company\n(which is a partner of our customer). One of the interfaces is defined by an XSD schema - the files\nwill be transferred daily via SFTP.

\n

JAXB: 1st attempt

\n

We decided to create a new JAR artifact that will use cxf-xjc-plugin maven plugin\nto generate Java classes from XSD schema files. A bit of configuration and here\nit is - a ready dependency to be included wherever we need it.

\n
<build>\n  <plugins>\n    <plugin>\n      <groupId>org.apache.cxf</groupId>\n      <artifactId>cxf-xjc-plugin</artifactId>\n      <version>3.2.1</version>\n      <configuration>\n        <extensions>\n          <extension>org.apache.cxf.xjcplugins:cxf-xjc-dv:3.2.1</extension>\n        </extensions>\n      </configuration>\n      <executions>\n        <execution>\n          <id>generate-sources</id>\n          <phase>generate-sources</phase>\n          <goals>\n            <goal>xsdtojava</goal>\n          </goals>\n          <configuration>\n            <sourceRoot>${basedir}/target/generated/src/main/java</sourceRoot>\n            <xsdOptions>\n              <xsdOption>\n                <xsd>${basedir}/src/main/resources/xsd/integration.xsd</xsd>\n                <packagename>software.xsolve.example</packagename>\n                <extensionArgs>\n                  <extensionArg>-Xdv</extensionArg>\n                </extensionArgs>\n              </xsdOption>\n            </xsdOptions>\n          </configuration>\n        </execution>\n      </executions>\n    </plugin>\n  </plugins>\n</build>
\n

I’ve started the implementation and quite soon it turned out to be cumbersome.\nAlthough the data structure is only 4 levels deep, building the tree using\nconstructors + setters was not pleasant at all. There’s no indentation that keeps\neverything organized, there’s a lot of boilerplate code… let’s try to improve it!

\n

Maybe JAXB could generate a builder?

\n

Well, yes! A quick google search of “jaxb builder”\nwill guide you to this StackOverflow post,\nwhere Mirko Klemm promotes a set of JAXB plugins\nthat he created by himself.

\n

When you jump to the repository, there’s a nice documentation\navailable. Two plugins seemed interesting for me:

\n\n

All right, let’s plug them in! ;)

\n
    \n
  1. \n

    Add an appropriate extension to your pom.xml file to grab the dependency\n(kind of):

    \n
    <extension>net.codesup.util:jaxb2-rich-contract-plugin:1.18.0</extension>
    \n

    This goes into build.plugins.configuration.extensions.

    \n
    2. \n
  2. \n

    Add two extensionArg elements in order to enable chosen plugins (consult\nthe docs in order to find the required flags for other plugins):

    \n
    <extensionArg>-Xfluent-builder</extensionArg>\n<extensionArg>-Ximmutable</extensionArg>
    \n

    This, on the other hand, goes into build.plugins.executions.configuration.xsdOptions.extensionArgs.

    \n
    3. \n
\n

So far so good! After a quick mvn clean install we can exploit a great, fluent\nbuilder API for object construction. A quick demo:

\n
final Region region = Region.builder()\n    .withCompany(EntityIdentifier.builder()\n        .withIdentifier("Facebook LTD")\n        .withType(EntityTypeCode.LTD)\n        .withName("Facebook")\n        .build())\n    .addEmployee(EntityIdentifier.builder()\n        .withIdentifier("123456")\n        .withType(EntityTypeCode.CONTRACTOR)\n        .withName("John Doe")\n        .build())\n    .build();
\n

Sweet & fun to use, don’t you think?

\n

Go away, XMLGregorianCalendar! Come here, java.time!

\n

After a while, I noticed that by default, xs:dateTime are converted\ninto XMLGregorianCalendar objects. Nobody likes to deal with old Java date/time\nAPIs… unless we convert them to JodaTime or java.time ;)

\n

Can it we done with JAXB?

\n

Again, a bit of googling\nand I stumbled upon a blog post by @gdpotter, entitled\nUsing Java 8 Time within JAXB with JXC.\nHey, that’s exactly what I need! In his artice, he performs a short demo of jaxb-java-time-adapters library,\ncreated by @migesok. The blog post is based on Gradle,\nlet’s port it to Maven world.

\n

This small lib is a set of adapters that you can ask JAXB to use while generating\nyour classes. How?

\n
    \n
  1. \n

    Add a dependency to your pom.xml.

    \n
    <dependency>\n  <groupId>com.migesok</groupId>\n  <artifactId>jaxb-java-time-adapters</artifactId>\n  <version>1.1.3</version>\n</dependency>
    \n
    2. \n
  2. \n

    Add a src/main/resources/binding.xml file that defines which adapters should be used.

    \n
    <bindings xmlns=\"http://java.sun.com/xml/ns/jaxb\" version=\"2.1\"\n  xmlns:xjc=\"http://java.sun.com/xml/ns/jaxb/xjc\">\n\n  <globalBindings>\n    <xjc:javaType name=\"java.time.OffsetDateTime\" xmlType=\"xs:dateTime\"\n      adapter=\"com.migesok.jaxb.adapter.javatime.OffsetDateTimeXmlAdapter\"/>\n  </globalBindings>\n\n</bindings>
    \n
    3. \n
  3. \n

    Setup the bindings file in pom.xml and make sure that JAXB extensions are enabled.\nIn our scenarion, two lines have to be added to the xsdOption section:

    \n
    <bindingFile>${basedir}/src/main/resources/binding.xml</bindingFile>\n<extension>true</extension>
    \n
    4. \n
\n

The end.

\n

I hope you’ll benefit from these two JAXB-related improvements that I just showed\nyou. Working with JAXB doesn’t have to be a pain, we can make it more enjoyable\nand up-to-date!

\n

Don’t hesitate to reach out! ;)

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\nxsolve.software

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