Ant / Jooq Generator-用maven导入的jooq库的路径

Question

I have a multi-module maven project and I'm implementing an ant task to generate jooq classes directly from jpa entities.

These are tutorials I am referring to:

• Code generation with Ant

• Code generation from entities

My ant task that gives me errors is this one (I believe because the classpath is not set):

<target name="02-gen-jooq">
    <java   classname="org.jooq.util.GenerationTool"
            fork="true"
            failonerror="true"
            logerror="true">

        <arg value="/jooq-config.xml"/> <!-- my jooq config file in project root folder -->
        <classpath>
            <!--
            <pathelement location="?"/> // what to put here??
            <pathelement location="?"/>
            <pathelement location="?"/>
            -->
        </classpath>
    </java>
</target>

The error given is:

Error: Could not find or load main class org.jooq.util.GenerationTool

In the tutorial, the classpath is set as follows:

<pathelement location="/path/to/jooq-3.5.4.jar"/>

but it seems the libraries were manually imported. What should I put if the libraries are imported with maven ?

Answer 1

Using Ant standalone

You have to put all of these jar files on your ant classpath if you want to trigger the code generation outside of Maven:

• The JDBC driver
• jooq-{version}.jar
• jooq-meta-{version}.jar
• jooq-codegen-{version}.jar

See also: https://www.jooq.org/doc/latest/manual/code-generation/codegen-configuration

Using Ant from Maven

The manual section you've linked shows how to use the maven-antrun-plugin:

<!-- Run the code generation task -->
<plugin>
  <artifactId>maven-antrun-plugin</artifactId>
  <version>1.8</version>
  <executions>
    <execution>
      <phase>generate-sources</phase>
      <configuration>
        <tasks>
          <java fork="true" 
                classname="org.jooq.util.GenerationTool"
                classpathref="maven.compile.classpath">
              <arg value="/path/to/configuration.xml"/>
          </java>
       </tasks>
      </configuration>
      <goals>
        <goal>run</goal>
      </goals>
    </execution>
  </executions>

  <dependencies>
    <dependency>
      <!-- JDBC driver -->
    </dependency>
    <dependency>
      <groupId>org.jooq</groupId>
      <artifactId>jooq-codegen</artifactId>
      <version>${jooq.version}</version>
    </dependency>
  </dependencies>
</plugin>

The important line is:

classpathref="maven.compile.classpath"

This way, the Maven class path is passed to the ant process running the jOOQ code generator. If you put this plugin in a Maven profile, you can run it explicitly from the command line, without it affecting the Maven build lifecycle otherwise.

Of course, you're probably better off using the jooq-codegen-maven plugin as documented here:

https://www.jooq.org/doc/latest/manual/code-generation/codegen-maven