Com/sun/mirror/apt/AnnotationProcessorFactory class not found in java8 release

I had a project which is build on java 1.6 and

Now i upgraded the java verion to 1.8 and build the project

Here i have used gradle for building the project Here is the gradle code

task wsgen(dependsOn: compileJava) {

doLast{

ant {

taskdef(name:‘wsgen’,

classname:‘com.sun.tools.ws.ant.WsGen’,

classpath:configurations.jaxws.asPath)

wsgen(keep:true,

destdir: “${buildDir}”,

resourcedestdir:"${sourceSets.main.output.resourcesDir}",

sourcedestdir:‘src/main/java’,

genwsdl:‘true’,

classpath:"${configurations.compile.asPath}:${sourceSets.main.output.classesDir}",

sei:’’)

}

} }

and the error , am getting is

java.lang.NoClassDefFoundError: com/sun/mirror/apt/AnnotationProcessorFactory

Can any one tell me, where the issue is located and raising from

dependencies {

jaxws ‘com.sun.xml.ws:jaxws-tools:2.1.7’ }