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The main difficult point was to deploy the module without any error. The thrown exceptions were saying that different packages could not be found at runtime. This errors were caused by wrong bnd.bnd file setup. Bellow is the bnd.bnd file content in the final form:

Bundle-Name: PdfModule
Bundle-SymbolicName: PdfModule
Bundle-Version: 1.0.0
Liferay-Configuration-Path: /configuration
Import-Package:\
    !antlr*,\
    !com.adobe.xmp*,\
    !com.github.kklisura*,\
    !com.google.zxing*,\
    !com.ibm.icu.lang*,\
    !com.ibm.icu.util*,\
	!groovy.lang*,\
	!groovyjarjarasm.asm*,\
	!mondrian.*,\
	!net.sf.jasperreports.annotations.properties*,\
	!net.sf.jasperreports.metadata.properties*,\
	!net.sourceforge.barbecue*,\
	!org.apache.batik*,\
	!org.apache.commons.javaflow*,\
	!org.apache.commons.pool2*,\
	!org.apache.http*,\
	!org.apache.lucene*,\
	!org.apache.poi*,\
	!org.apache.velocity*,\
	!org.codehaus*,\
	!org.eclipse.jdt.core.index*,\
	!org.eclipse.jdt.core.util*,\
	!netscape.ldap*,\
	!org.apache.oro*,\
	!org.hibernate.query*,\
	!org.kohsuke.groovy.sandbox*,\
	!org.krysalis.barcode4j*,\
	!org.mozilla.javascript*,\
	!org.olap4j*,\
	!org.springframework*,\
	!org.w3c.dom.svg*,\
	!org.bouncycastle*,\
    *
Include-Resource: @jasperreports-6.16.0.jar,@commons-collections4-4.2.jar,@commons-digester-2.1.jar,@ecj-3.21.0.jar,@castor-xml-1.4.1.jar,@commons-lang3-3.9.jar,@castor-core-1.4.1.jar,@jfreechart-1.0.19.jar,@jcommon-1.0.24.jar,@jackson-databind-2.10.0.jar,@jackson-core-2.10.0.jar,@jackson-annotations-2.10.0.jar,@itext-2.1.7.jar

And bellow, the build.gradle file:

dependencies {
	compileOnly group: "javax.ws.rs", name: "javax.ws.rs-api"
	compileOnly group: "org.osgi", name: "org.osgi.service.component.annotations"
	compileOnly group: "org.osgi", name: "org.osgi.service.jaxrs"
    
    // Jasper
    compileOnly group: 'net.sf.jasperreports', name: 'jasperreports', version: '6.16.0'
	compileOnly group: 'org.apache.commons', name: 'commons-collections4', version: '4.2'
	compileOnly group: 'com.lowagie', name: 'itext', version: '2.1.7'
}

It may not be in their best case form, but it will save you a lot of time starting from these.

If you have any suggestions, please do share ! :)

hi Victor

thank you very much for sharing. 

i am using liferay 7.4, it cannot work with this setting