ant warning includeantruntime was not set

Question

I receive the following warning    javac  build xml 9  warning   includeantruntime  was not set   defaulting to build sysclasspath last  set to false for repeatable builds   What does this mean

User · Answer

Chet Hosey wrote a nice explanation here:

Historically, Ant always included its own runtime in the classpath made available to the javac task. So any libraries included with Ant, and any libraries available to ant, are automatically in your build's classpath whether you like it or not.

It was decided that this probably wasn't what most people wanted. So now there's an option for it.

If you choose "true" (for includeantruntime), then at least you know that your build classpath will include the Ant runtime. If you choose "false" then you are accepting the fact that the build behavior will change between older versions and 1.8+.

As annoyed as you are to see this warning, you'd be even less happy if your builds broke entirely. Keeping this default behavior allows unmodified build files to work consistently between versions of Ant.

User · Answer

As  Daniel Kutik mentioned  presetdef is a good option   Especially if one is working on a project with many build xml files which one cannot  or prefers not to  edit  e g   those from third-parties    To use presetdef  add these lines in your top-level build xml file      lt presetdef name  javac  gt       lt javac includeantruntime  false    gt     lt  presetdef gt    Now all subsequent javac tasks will essentially inherit includeantruntime  false    If your projects do actually need ant runtime libraries  you can either add them explicitly to your build files OR set includeantruntime  true    The latter will also get rid of warnings   Subsequent javac tasks can still explicitly change this if desired  for example    lt javac destdir  out  includeantruntime  true  gt     lt src path  foo java    gt     lt src path  bar java    gt   lt  javac gt    I d recommend against using ANT OPTS   It works  but it defeats the purpose of the warning   The warning tells one that one s build might behave differently on another system   Using ANT OPTS makes this even more likely because now every system needs to use ANT OPTS in the same way   Also  ANT OPTS will apply globally  suppressing warnings willy-nilly in all your projects

User · Answer

Use  lt property name  build sysclasspath  value  last   gt  in your build xml file  For more details search includeAntRuntime in Ant javac  Other possible values could be found here

User · Answer

The answer from Daniel works just perfect  Here is a sample snippet that I added to my build xml    lt target name  compile  gt       lt mkdir dir    classes dir    gt       lt javac srcdir    src dir   destdir    classes dir   includeantruntime  false  gt                                                    lt  --                              -- gt           lt classpath gt               lt path id  application  location    jar dir    ant project name  jar   gt               lt path id  junit  location    lib dir  junit-4 9b2 jar   gt           lt  classpath gt       lt  javac gt   lt  target gt

User · Answer

Ant Runtime  Simply set includeantruntime  false     lt javac includeantruntime  false      gt     lt  javac gt    If you have to use the javac-task multiple times you might want to consider using PreSetDef to define your own javac-task that always sets includeantruntime  false    Additional Details  From http   www coderanch com t 503097 tools warning-includeantruntime-was-not-set      That s caused by a misfeature   introduced in Ant 1 8  Just add an   attribute of that name to the javac   task  set it to false  and forget it   ever happened    From http   ant apache org manual Tasks javac html      Whether to include the Ant run-time   libraries in the classpath  defaults   to yes  unless build sysclasspath is   set  It is usually best to set this to   false so the script s behavior is not   sensitive to the environment in which   it is run

User · Answer

If you like me work from commandline the quick answer is executing  export ANT OPTS -Dbuild sysclasspath ignore   And then run your ant script again

User · Answer

i faced this same  i check in in program and feature  there was an update has install for jdk1 8 which is not compatible with my old setting jdk1 6 0  for ant in eclipse   I install that update   right now  my ant project is build success   Try it  hope this will be helpful

[java] ant warning: "'includeantruntime' was not set"

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