I am using Gradle version 2.14, I have made changes in build.gradle to exclude packages from JPAAnnotationProcessor as mentioned in question.
My build.gradle configuration for same as follows:
configurations {
    querydslapt     
}
dependencies{
    compile group: 'com.querydsl', name: 'querydsl-core', version: '4.1.4'
    compile group: 'com.querydsl', name: 'querydsl-apt', version: '4.1.4'
    compile group: 'com.querydsl', name: 'querydsl-jpa', version: '4.1.4'
}
task generateQueryDSL(type: JavaCompile, group: 'build', description: 'Generates the QueryDSL query types') {
    source =sourceSets.main.java
    classpath = configurations.compile + configurations.querydslapt
    options.compilerArgs = [
            "-proc:only",
            "-processor", "com.querydsl.apt.jpa.JPAAnnotationProcessor",
            "-Aquerydsl.excludedPackages=com.projectx.data.domain.poc.lombok"            
    ]
    destinationDir = sourceSets.generated.java.srcDirs.iterator().next()
}
compileJava {
    dependsOn generateQueryDSL
    source generateQueryDSL.destinationDir
}
compileGeneratedJava {
    dependsOn generateQueryDSL
    options.warnings = false
    classpath += sourceSets.main.runtimeClasspath
}
But when I am building application I getting warning as warning: The following options were not recognized by any processor: '[querydsl.excludedPackages]'
And specified packages are not excluded from preprocessing.