Copy html files from java package to war file

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Hello,

I have html files in my package directory, and I would like to see them in the WEB-INF/classes/packagename directory in the generated war file.

My current build.gradle (6.3) file content:

apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'gwt'
apply plugin: 'eclipse'
apply plugin: 'eclipse-wtp'
apply plugin: 'org.gretty'
apply plugin: 'maven'

sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8

if (JavaVersion.current() > JavaVersion.VERSION_1_8) {
    tasks.withType(JavaCompile) {
        options.compilerArgs.addAll(["--release", "8"])
    }
}

compileJava.options.encoding = 'UTF-8'
compileTestJava.options.encoding = 'UTF-8'

farm {
  webapp ':'
}

buildscript {
    repositories {
    	//mavenCentral()
        jcenter()
        maven { url 'https://repo.spring.io/plugins-release' }
        maven { url "https://plugins.gradle.org/m2/" }
        maven { url 'https://jitpack.io' }
        //maven { url 'https://repository.jboss.org/nexus/content/repositories/thirdparty-releases/' }
    }
    dependencies {
        classpath "org.wisepersist:gwt-gradle-plugin:1.+"
        classpath "gradle.plugin.org.gretty:gretty:3.0.3"
    }
}

war {
    archiveName 'SalesService.war'
    //rootSpec.exclude('WEB-INF/classes/**/*.class')
    //rootSpec.exclude('WEB-INF/classes/**/*.gwt.xml')
    rootSpec.include('**/*.html')
    rootSpec.include('**/*.sablon')
    rootSpec.include('**')
    from 'webContent'
}

gretty {
    httpPort = 8080;
    servletContainer = 'tomcat9'
    managedClassReload = false
    reloadOnClassChange = false
    extraResourceBase 'build/gwt/out'
    jvmArgs = ['-Dfile.encoding=UTF-8', '-Xmx2048M', '-Ddebug=true' ]
    redeployMode='redeploy'
}

repositories {
	mavenCentral()
    jcenter()
    maven { url 'https://jitpack.io' }
    maven { url 'https://repository.jboss.org/nexus/content/repositories/thirdparty-releases/' }
   flatDir {
       dirs 'webContent/WEB-INF/lib'
   }
}

gwt {
    logLevel = 'INFO'

    maxHeapSize = "8192M";

    //gwtVersion='2.8.2'
    gwtVersion='2.9.0'

	//'partnercimkoordfeltolt.Parcim','terkep.Terkep','hetiTerv2.HetiTerv2',
    modules = ['berend.Berend','cikkcsopgyartoadatlap.Cikkcsopgyartoadatlap','forgdiagram.Forgdiagram',
    'gwtpartneradatlap.GwtPartnerAdatlap','menu.Menu','parkapcs.Parkapcs']
   
    compiler {
        disableClassMetadata = false;
        strict = true;
        style = "OBF";
        //style = "PRETTY";
        localWorkers = 4;
    }

    superDev {
        noPrecompile = true;
        failOnError = false;
        bindAddress = "0.0.0.0";
    }
   
    eclipse {
        addGwtContainer = true;
    }
}
 
configurations {
  provided
}

dependencies {
    gwt 'com.google.gwt:gwt-user:'+gwt.gwtVersion
    providedCompile 'com.google.gwt:gwt-servlet:'+gwt.gwtVersion
    // Invalid linker name 'xsiframe' 
	//providedCompile group: 'com.google.gwt.google-apis', name: 'gwt-ajaxloader', version: '1.0.0'
	
    gwt 'com.google.elemental2:elemental2-dom:1.0.0'
    gwt 'com.google.elemental2:elemental2-core:1.0.0'
    gwt 'com.google.elemental2:elemental2-promise:1.0.0'
    gwt 'com.ekotrope:gwt-completablefuture:1.0.0'
   
    providedCompile 'javax.servlet:javax.servlet-api:3.0.1'
    compile 'javax.ws.rs:javax.ws.rs-api:2.1.1'
   
    gwt 'org.fusesource.restygwt:restygwt:2.2.+'
    gwt "com.fasterxml.jackson.core:jackson-annotations:2.9.6"
    gwt "com.fasterxml.jackson.core:jackson-databind:2.9.6"
    gwt 'com.google.code.findbugs:jsr305:3.0.0' //required for restygwt compile
    gwt 'com.github.nmorel.gwtjackson:gwt-jackson:0.15.2'
   
    gwt ('com.google.gwt.eventbinder:eventbinder:1.1.0') {
        //exclude module: 'gwt-user'
    }
   
    gwt 'javax.xml.bind:jaxb-api:2.3.+'
    
    compile group: 'com.microsoft.sqlserver', name: 'mssql-jdbc', version: '6.1.0.jre8'
    compile group: 'javax.mail', name: 'mail', version: '1.4.7'
    compile group: 'com.googlecode.gchart', name: 'gchart', version: '2.6'
    compile group: 'com.liferay', name: 'org.apache.commons.fileupload', version: '1.2.2.LIFERAY-PATCHED-1'
    
    implementation name: 'gwt-maps-api-3.10.0-alpha-8-SNAPSHOT'
}

task "create-dirs" {
    doLast{
    sourceSets*.java.srcDirs*.each { it.mkdirs() }
    sourceSets*.resources.srcDirs*.each { it.mkdirs() }
}}

eclipseJdt {
    doLast{
    File f = file('.settings/org.eclipse.core.resources.prefs')
    f.write('eclipse.preferences.version=1\n')
    f.append('encoding/<project>=utf-8')
    f = file('.settings/org.eclipse.core.runtime.prefs')
    f.write('eclipse.preferences.version=1\n')
    f.append('line.separator=\\n\n')
}}

eclipse {
    project {
        name = 'webcrm'
        webAppDirName = 'war'
    }

    classpath {
        downloadSources = true
        downloadJavadoc = true
    }

    jdt {
        sourceCompatibility=1.8
        targetCompatibility=1.8
    }

    wtp {
        facet {
            facets = []
            facet name: 'jst.java', version: '1.8'
            facet name: 'jst.web', version: '3.0'
            facet name: 'com.gwtplugins.gwt.facet', version: '1.0'
        }
    }
}