Use Ant for running program with command line arguments

Question

My program getting command line arguments  How can I pass it when I use Ant

User · Answer

If you do not want to handle separate properties for each possible argument, I suggest you'd use:

<arg line="${args}"/>

You can check if the property is not set using a specific target with an unless attribute and inside do:

<input message="Type the desired command line arguments:" addProperty="args"/>

Putting it all together gives:

<target name="run" depends="compile, input-runargs" description="run the project">
  <!-- You can use exec here, depending on your needs -->
  <java classname="Main">
    <arg line="${args}"/>
  </java>
</target>
<target name="input-runargs" unless="args" description="prompts for command line arguments if necessary">
  <input addProperty="args" message="Type the desired command line arguments:"/>
</target>

You can use it as follows:

ant
ant run
ant run -Dargs='--help'

The first two commands will prompt for the command-line arguments, whereas the latter won't.

User · Answer

Can you be a bit more specific about what you re trying to do and how you re trying to do it   If you re attempting to invoke the program using the  lt exec gt  task you might do the following    lt exec executable  name-of-executable  gt     lt arg value  arg0   gt     lt arg value  arg1   gt   lt  exec gt

User · Answer

What I did in the end is make a batch file to extract the CLASSPATH from the ant file  then run java directly using this   In my build xml    lt target name  printclasspath  gt       lt pathconvert property  classpathProp  refid  project class path   gt       lt echo gt   classpathProp  lt  echo gt   lt  target gt    In another script called  run sh    export CLASSPATH   ant -q printclasspath   grep echo   cut -d    -f 7  build java        It s no longer cross-platform  but at least it s relatively easy to use  and one could provide a  bat file that does the same as the run sh   It s a very short batch script    It s not like migrating the entire build to platform-specific batch files   I think it s a shame there s not some option in ant whereby you could do something like   ant -- arg1 arg2 arg3   mpirun uses this type of syntax  ssh also can use this syntax I think

User · Answer

Extending Richard Cook s answer   Here s the ant task to run any program  including  but not limited to Java programs     lt target name  run  gt      lt exec executable  name-of-executable  gt         lt arg value    arg0    gt         lt arg value    arg1    gt      lt  exec gt   lt  target gt    Here s the task to run a Java program from a  jar file    lt target name  run-java  gt      lt java jar  path for jar  gt         lt arg value    arg0    gt         lt arg value    arg1    gt      lt  java gt   lt  target gt    You can invoke either from the command line like this   ant -Darg0 Hello -Darg1 World run   Make sure to use the -Darg syntax  if you ran this   ant run arg0 arg1   then ant would try to run targets arg0 and arg1

User · Answer

The only effective mechanism for passing parameters into a build is to use Java properties   ant -Done 1 -Dtwo 2   The following example demonstrates how you can check and ensure the expected parameters have been passed into the script   lt project name  check  default  build  gt        lt condition property  params set  gt           lt and gt               lt isset property  one   gt               lt isset property  two   gt           lt  and gt       lt  condition gt        lt target name  check  gt           lt fail unless  params set  gt          Must specify the parameters  one  two          lt  fail gt       lt  target gt        lt target name  build  depends  check  gt           lt echo gt          one     one          two     two           lt  echo gt       lt  target gt    lt  project gt

[java] Use Ant for running program with command line arguments

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