Custom the logstash java-Filter meet problem(cannot create task "gem")

[xiaoping1993 (jiping wang)]

I want to custom the logstash java-Filter follow the url:https://www.elastic.co/guide/en/logstash/7.6/java-filter-plugin.html

but I meet a problem when I run "gradlew gem"
the error is below

[xiaoping1993 (jiping wang)]

this problem have be resovled!!!!
just to modiy the configuration file:build.gradle
use
tasks.register("gem"){
dependsOn downloadAndInstallJRuby
dependsOn removeObsoleteJars
dependsOn vendor
dependsOn generateRubySupportFiles
doLast {
buildGem(projectDir, buildDir, pluginInfo.pluginFullName() + ".gemspec")
}
}
replace
tasks.register("gem"){
dependsOn [downloadAndInstallJRuby,removeObsoleteJars,vendor,generateRubySupportFiles]
doLast {
buildGem(projectDir, buildDir, pluginInfo.pluginFullName() + ".gemspec")
}