How to pass arguments from command line to gradle

Question

I m trying to pass an argument from command line to a java class   I followed this post  http   gradle 1045684 n5 nabble com Gradle-application-plugin-question-td5539555 html but the code does not work for me  perhaps it is not meant for JavaExec     Here is what I tried   task listTests type JavaExec       main    util TestGroupScanner      classpath   sourceSets util runtimeClasspath        this works        args  demo                this does not work      if  project hasProperty  group             args group                  The output from the above hard coded args value is   C  ws svn sqe sandbox selenium2forbg testgradle gt g listTests  compileUtilJava UP-TO-DATE  processUtilResources UP-TO-DATE  utilClasses UP-TO-DATE  listTests Received argument  demo  BUILD SUCCESSFUL  Total time  13 422 secs   However  once I change the code to use the hasProperty section and pass  demo  as an argument on the command line  I get a NullPointerException   C  ws svn sqe sandbox selenium2forbg testgradle gt g listTests -Pgroup demo -s  FAILURE  Build failed with an exception     Where  Build file  C  ws svn sqe sandbox selenium2forbg testgradle build gradle  line 25    What went wrong  A problem occurred evaluating root project  testgradle    gt  java lang NullPointerException  no error message     Try  Run with --info or --debug option to get more log output     Exception is  org gradle api GradleScriptException  A problem occurred evaluating root project   testgradle       at org gradle groovy scripts internal DefaultScriptRunnerFactory ScriptRunnerImpl run DefaultScriptRunnerFactory java 54      at org gradle configuration DefaultScriptPluginFactory ScriptPluginImpl apply DefaultScriptPluginFactory java 127      at org gradle configuration BuildScriptProcessor evaluate BuildScriptProcessor java 38     There is a simple test project available at http   gradle 1045684 n5 nabble com file n5709919 testgradle zip that illustrates the problem   This is using Gradle 1 0-rc-3   The NullPointer is from this line of code   args group    I added the following assignment before the task definition  but it didn t change the outcome   group   hasProperty  group     group    nosuchgroup     Any pointers on how to pass command line arguments to gradle appreciated

User · Answer

If you need to check and set one argument  your build gradle file would be like this         def coverageThreshold   0 15  if  project hasProperty  threshold          coverageThreshold   project property  threshold   toString   toBigDecimal        print the value of variable println  Coverage Threshold   coverageThreshold         And the Sample command in windows      gradlew clean test -Pthreshold 0 25

User · Answer

Building on Peter N s answer  this is an example of how to add  optional  user-specified arguments to pass to Java main for a JavaExec task  since you can t set the  args  property manually for the reason he cites    Add this to the task   task runProgram  type  JavaExec                if  project hasProperty  myargs            args myargs split                 and run at the command line like this      gradlew runProgram  -Pmyargs -x 7 --no-kidding  Users rogers tests file txt

User · Answer

I have written a piece of code that puts the command line arguments in the format that gradle expects      this method creates a command line arguments def setCommandLineArguments commandLineArgs           remove spaces      def arguments   commandLineArgs tokenize                   create a string that can be used by Eval              def cla                      go through the list to get each argument             arguments each                       cla             it                                remove last     add     and set the args      return cla substring 0  cla lastIndexOf                 my task looks like this   task runProgram type  JavaExec        if   project hasProperty  commandLineArgs                   args Eval me  setCommandLineArguments commandLineArgs              To pass the arguments from the command line you run this   gradle runProgram -PcommandLineArgs  arg1 arg2 arg3 arg4

User · Answer

As of Gradle 4 9 Application plugin understands --args option  so passing the arguments is as simple as  build gradle plugins       id  application     mainClassName    quot my App quot   src main java my App java public class App       public static void main String   args            System out println args            bash   gradlew run --args  This string will be passed into my App main arguments   or in Windows  use double quotes  gradlew run --args  quot This string will be passed into my App main arguments quot

User · Answer

pass a url from command line keep your url in app gradle file as follows  resValue  string    url   CommonUrl  and give a parameter in gradle properties files as follows  CommonUrl  put your url here or may be empty   and pass a command to from command line as follows gradle assembleRelease -Pcommanurl put your URL here

User · Answer

My program with two arguments  args 0  and args 1    public static void main String   args  throws Exception       System out println args       String host   args 0       System out println host       int port   Integer parseInt args 1      my build gradle  run       if   project hasProperty  appArgsWhatEverIWant               args Eval me appArgsWhatEverIWant            my terminal prompt   gradle run  -PappArgsWhatEverIWant    localhost   8080

User · Answer

project group is a predefined property  With -P  you can only set project properties that are not predefined  Alternatively  you can set Java system properties  -D

User · Answer

It s possible to utilize custom command line options in Gradle to end up with something like     gradlew printPet --pet  puppies     However  custom command line options in Gradle are an incubating feature    Java solution  To end up with something like this follow the instructions here   import org gradle api tasks options Option   public class PrintPet extends DefaultTask       private String pet        Option option    pet   description    Name of the cute pet you would like to print out        public void setPet String pet            this pet   pet              Input     public String getPet             return pet              TaskAction     public void print             getLogger   quiet       are awesome    pet             Then register it   task printPet type  PrintPet    Now you can do     gradlew printPet --pet  puppies    output      Puppies  are awesome    Kotlin solution  open class PrintPet   DefaultTask           Suppress  UnstableApiUsage        set Option option    pet   description    The cute pet you would like to print out        get Input     var pet  String            TaskAction     fun print                 println   pet are awesome              then register the task with   tasks register lt PrintPet gt   printPet

User · Answer

There s a great example here   https   kb novaordis com index php Gradle Pass Configuration on Command Line  Which details that you can pass parameters and then provide a default in an ext variable like so   gradle -Dmy app color blue   and then reference in Gradle as   ext      color   System getProperty  my app color    red        And then anywhere in your build script you can reference it as  course anywhere you can reference it as project ext color  More tips here  https   kb novaordis com index php Gradle Variables and Properties

[gradle] How to pass arguments from command line to gradle

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