itext7 - iText 7 Hello World example fails with NoClassDefFoundError -

working down first example of itext 7 code causes noclassdeffounderror @ step 4. if can point error coming helpful?

import com.itextpdf.kernel.pdf.pdfwriter import com.itextpdf.kernel.pdf.pdfdocument import com.itextpdf.layout.document import com.itextpdf.layout.element.paragraph  //step 1 - writer writer = new pdfwriter(new fileoutputstream(dest)) //step 2 - pdf pdf = new pdfdocument(writer) //step 3 - document document = new document(pdf) //step 4 - content document.add( new paragraph ( 'hello world!' ) ) 

this produces

java.lang.noclassdeffounderror: not initialize class com.itextpdf.io.font.fontprogramfactory 

code being run under groovy why more sparse io, kernel , layout jars loaded.

did watch video on how install itext 7? error message tells you didn't include io jar. assumption have added kernel , layout jar classpath, overlooked adding io jar.

these of documented dependencies in before start: installing itext 7 section of jump-start tutorial:

<dependency>     <groupid>com.itextpdf</groupid>     <artifactid>kernel</artifactid>     <version>7.0.0</version>     <scope>compile</scope> </dependency> <dependency>     <groupid>com.itextpdf</groupid>     <artifactid>io</artifactid>     <version>7.0.0</version>     <scope>compile</scope> </dependency> <dependency>     <groupid>com.itextpdf</groupid>     <artifactid>layout</artifactid>     <version>7.0.0</version>     <scope>compile</scope> </dependency> 

as explained in videos, io jar dependency of kernel jar.

you write:

the io, kernel , layout jars loaded.

the error message shared, tells me io jar isn't loaded. com.itextpdf.io.font.fontprogramfactory class stored in jar.