How to create pojo classes from XSD?

Question

I am using Spring maven plugin, I want to create POJO classes from specified xml schema in particular folder. I tried with xjc command through java code, but its not generating that classes. secondly, I tried with jaxb, but its dealing with xml file not a xsd schema while marshell/unmarshelling. I think this not a way to create POJO from xsd.

What is a correct way to generate classes from xsd in java?

below is XSD

   <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:element name="Employee">
   <xs:complexType>
   <xs:sequence>
    <xs:element name="empId" type="xs:long"/>
    <xs:element name="lastName" type="xs:string"/>
    <xs:element name="title" type="xs:string"/>
    <xs:element name="salary" type="xs:integer"/>
    <xs:element name="address">
    <xs:complexType>
       <xs:sequence>
         <xs:element name="city" type="xs:string"/>
         <xs:element name="street" type="xs:string"/>
         <xs:element name="zipcode" type="xs:integer"/>
         <xs:element name="privatePhoneNo">
           <xs:complexType>
             <xs:sequence>
                 <xs:element name="privateMobile" type="xs:string"/>
                 <xs:element name="privateLandline" type="xs:string"/>
             </xs:sequence>
           </xs:complexType>
         </xs:element>
        </xs:sequence>
     </xs:complexType>
    </xs:element>
 </xs:sequence>
 </xs:complexType>
 </xs:element>
 </xs:schema>

Parthia

We use a tool called XMLBeans in our production code. It is deprecated, but has worked well for us. – Monostome

can you please explain more. how to use it? – Parthia

You can't "create classes at run time". You can however create classes at build time (or manually before that) from an XML Schema (XSD) file, using XJC. I don't know how you do that using maven, though, but have you tried running the xjc command yourself? – Admass

As @Admass mentioned, you can't create classes at runtime, but you can create classes during the build. See here for more information. Keep in mind that XMLBeans was retired as of about one year ago. So you might want to use a more modern framework. – Monostome

@Admass yes I will change my question it should generate at build time. and I tried with xjc its working when I am manually firing that command on cmd but through java code its not generating that classes. – Parthia

String[] createPojo= new String [] { "CMD.EXE", "/C", "cd \"C:\\training_1\\mongo-starter\" && dir","xjc -d target -p generated-sources Xmlschema.xsd" }; Process runtimeProcess = Runtime.getRuntime().exec(createPojo); int processComplete = runtimeProcess.waitFor(); – Parthia

What do you mean "through java code"? Why are you running Java code at build time? The build should be done with Ant, Maven, Gradle, or other build tool, and the build produces Java class files to be executed at run time. – Admass

through java code only I want to generated classes from the given XSD. XSD will changes so I want to configure something which through I can genrated that pojo class according to XSD – Parthia

classes from XSD can (and MUST) be autogenerated by your IDE using JAXB plugin.... javaworld.com/article/2071784/enterprise-java/… – Facelift

JAXB has to work whichever may be the way you trying, you seem to be doing something wrong. Why don't you share the xsd file, we can try to generate POJO from it and get back. – Thema

yes @Bikram Kundu Actually I am not getting how to use jaxb through java code for pojo creation I dont want to create it manually by creating jaxb project then using that generate pojo functions of IDE.I am adding XSD – Parthia

Possible duplicate of #11463731 – Caseate

Answer 1

My recommendation is to go with JAXB.

I have tested it in eclipse, works well for me. My suggestion is try generating the POJO from command line or with the help of eclipse. Once successful configure it with maven to generate the POJO build time.

There are several tutorials to learn this, please follow the below link(s) based upon your preference:

• Generate POJO Class from XSD in Eclipse
• Generate POJO class from XSD Schema command line
• Generate POJO Classes from XSD using XJC Maven Plugin

Also the youtube links:

• Youtube video tutorial
• Youtube tutorial using maven

I hope it helps!

Feel free to comment if you encounter any issue.

Thema

yes I gone thrugh this all. I dont want to create those classes manually or by the cmd it should be generate from java code I am using Spring .Actually if our XSD file is same then it works fine but in my case XSD file will change time to time user will give us a xsd file and from that I want to create classes so I dont want to generate it manually.is there any onather way? can we run that cmd command through Spring ? – Parthia

I have mentioned about how to achieve it in build time using maven, this should help you. Check the third link! I don't think you can achieve it run time, at least I am not aware of anything like that! – Thema

yes In third link we have to configure pakage path and file then it will generate those classes at build time. but is ther any onather way to configure without using plugins? – Parthia

Please let me know if it is not helping you! – Thema

Its Helping me but my requirement is little bit different instead of configuring in plugin I want to take that XSD file from user . so I tried to run that XJC command through java code but that is not working – Parthia

Thank you for the third link :) exactly what I needed – Filch

looks like the page refer by 3rd link is move https://www.digitalocean.com/community/tutorials/jaxb2-maven-plugin-xjc-example-generate-java-classes-xsd – Deepset

Answer 2

jaxb2-maven-plugin

Using jaxb2-maven-plugin is the easiest way. Define the plugins as below :

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>jaxb2-maven-plugin</artifactId>
            <version>1.6</version>
            <executions>
                <execution>
                    <goals>
                        <goal>xjc</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <schemaDirectory>${project.basedir}/src/main/xsd/</schemaDirectory>
                <schemaFiles>MARC21slim.xsd</schemaFiles>
            </configuration>
        </plugin>
    </plugins>
</build>

and execute :

mvn jaxb2:xjc

the generated files will be located in target\generated-sources\jaxb

Abranchiate

Awesomely simple. Thanks mate – Siusan

Answer 3

One simple way to convert .xsd files to Java file is xjc tool. Just execute the following command in the same working directory:

xjc test.xsd

Tiv

Here is an example of xjc thoughts-on-java.org/generate-your-jaxb-classes-in-second – Billowy

Answer 4

jaxb2-maven-plugin version 2 changes how the configure.

The following will run xjc on everything in src/main/resource and put it com.yourcompany.xsd

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>jaxb2-maven-plugin</artifactId>
    <version>2.5.0</version>
    <executions>
        <execution>
            <goals>
                <goal>xjc</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <sources>
            <source>src/main/resources</source>
        </sources>
        <packageName>com.yourcompany.xsd</packageName>
    </configuration>
</plugin>

Check out the implicit behavior in https://www.mojohaus.org/jaxb2-maven-plugin/Documentation/v2.5.0/example_xjc_basic.html

Stockwell