Gradle任務缺少jar文件的主類

Question

我一直在嘗試使用JavaExec類型的任務執行jar文件JavaExec 。 但是gradle給了我no main class specified的錯誤。 我是新手，所以如果有人可以詳細說明，那就太好了。 這是我寫的任務：

task executeSqlScriptRunnerBeforeTenantCreation(type:JavaExec) {
    description "Execute ssr.runner to install certificates into the device"
    doLast {
        if(scriptRunnerVariables.get('SSR_INTERSECT_MOCK') == 'true') {

            println "Executing SQL Script Runner..."
            println "Adding certificates for mocked intersect service"

            if(scriptRunnerVariables.get('SSR_DB_TYPE') == 'SQL_SERVER') {
                classpath =  file("{$workingDir}\\ssr.runner.jar")
                main =  '-jar' 
                args '-dbtype', "${scriptRunnerVariables.get('SSR_DB_TYPE')}", '-dbhost', "${scriptRunnerVariables.get('SSR_DB_HOST')}", '-dbinstance', 
                "${scriptRunnerVariables.get('SSR_DB_INSTANCE')}", '-dbname', "${scriptRunnerVariables.get('SSR_DB_NAME')}", '-dbuser', "${scriptRunnerVariables.get('SSR_DB_USER')}",
                '-dbpass', "${scriptRunnerVariables.get('SSR_DB_PASS')}", '-sqlscriptpath', "${scriptRunnerVariables.get('SSR_INTERSECT_MOCK_DB_SCRIPT')}"  
            }    
        }
    }
}

Answer 1

首先，您要混合兩個階段： 執行和配置 。 無需為預定義任務添加doLast 。 看這里 。 然后，這就是（大概）腳本的外觀：

task executeSqlScriptRunnerBeforeTenantCreation(type:JavaExec) {
    description "Execute ssr.runner to install certificates into the device"

    if(scriptRunnerVariables.get('SSR_INTERSECT_MOCK') == 'true') {
        println "Configuring SQL Script Runner..."
        println "Adding certificates for mocked intersect service"

        if(scriptRunnerVariables.get('SSR_DB_TYPE') == 'SQL_SERVER') {
            main = '<FULLY QUALIFIED NAME OF CLASS YOU NEED TO RUN>' 
            classpath =  file("{$workingDir}\\ssr.runner.jar")            
            args '-dbtype', 
                 "${scriptRunnerVariables.get('SSR_DB_TYPE')}", 
                 '-dbhost', 
                 "${scriptRunnerVariables.get('SSR_DB_HOST')}", 
                 '-dbinstance', 
                 "${scriptRunnerVariables.get('SSR_DB_INSTANCE')}", 
                 '-dbname', 
                 "${scriptRunnerVariables.get('SSR_DB_NAME')}", 
                 '-dbuser', 
                 "${scriptRunnerVariables.get('SSR_DB_USER')}",
                 '-dbpass', 
                 "${scriptRunnerVariables.get('SSR_DB_PASS')}", 
                 '-sqlscriptpath', 
                 "${scriptRunnerVariables.get('SSR_INTERSECT_MOCK_DB_SCRIPT')}"  
            }
        }
    }
}

main配置錯誤，應該傳遞需要運行的Java類的完全限定名稱（帶有包）。 當然，什么是通過配置 classpath ， main ， args在配置階段等都將在執行階段中運行只有在兩個表達式if塊評估為true。