Ant build for Intellij-IDEA GUI forms

I have a project using forms, it compiles and runs just fine, but when compiled with the generated ant it doesn't run

my ant file has the java2 task and i added the needed jars to my lib folder

  <property name="javac2.home" value="lib/idea"/>
  <path id="javac2.classpath">
    <pathelement location="${javac2.home}/javac2.jar"/>
    <pathelement location="${javac2.home}/jdom.jar"/>
    <pathelement location="${javac2.home}/asm.jar"/>
    <pathelement location="${javac2.home}/asm-commons.jar"/>
    <pathelement location="${javac2.home}/jgoodies-forms.jar"/>
  </path>
  <taskdef name="javac2" classname="com.intellij.ant.Javac2" classpathref="javac2.classpath"/>
  <taskdef name="instrumentIdeaExtensions" classname="com.intellij.ant.InstrumentIdeaExtensions" classpathref="javac2.classpath"/>

but when I run my program I get the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: com/intellij/uiDesigner/core/Spacer
Caused by: java.lang.ClassNotFoundException: com.intellij.uiDesigner.core.Spacer
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

I have noticed that the version compiled from the Idea has some classes in the output folder (what is missing) while the ant generated version doesn't have those classes.

EDIT: i implemented the solution from below, this means I modified my ant build to extract the content of forms_rt.jar to my output folder

<unjar src="${javac2.home}/forms_rt.jar" dest="${webserver.output.dir}">
          <patternset>
              <include name="**/*.class"/>
          </patternset>
</unjar>

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